38719809 BAB 1 Agregat Kasar XII

I -

LAPORAN LABORATORIUM REKAYASA TRANSPORTASI

BAB I

PENGUJIAN BAHAN AGREGAT KASAR

1.1. PENGUJIAN BERAT JENIS DAN

PENYERAPAN AGREGAT KASAR (Specific Gravity

and Absorption of Coarse Aggregate).

1.1.1. Tujuan

Pemeriksaan ini bertujuan untuk menentukan berat jenis kering oven

(bulk specific gravity), berat jenis kering permukaan jenuh (saturated

surface dry), berat jenis semu (apparent specific gravity) dan penyerapan air

(water absorpsi) dari agregat kasar.

1.1.2. Teori Ringkas

Berat jenis agregat adalah perbandingan antara berat volume agregat

dan berat volume air. Besar jenis agregat penting dalam perencanaan

campuran agregat dengan aspal keras, umumnya direncanakan berdasarkan

perbandingan berat dan juga untuk menentukan banyak pori. Agregat

dengan berat jenis yang kecil mempunyai volume yang besar sehingga berat

yang sama membutuhkan jumlah aspal yang banyak disamping itu agregat

dengan kadar pori yang besar membutuhkan jumlah aspal yang banyak.

Ada 3 berat jenis yang dapat ditentukan berdasarkan manual

PB 0202-76 atau AASHTO T85-81.

A. Berat jenis kering oven (bulk specific gravity)

Berat jenis kering oven ialah berat jenis yang memperhitungkan

seluruh volume pori yang ada (volume pori yang dapat diresapi air dan

volume pori yang tidak dapat diresapi air).

Rumus Perhitungan :

CB

ABJ bulk −

= ................................................... (1. 1)

KELOMPOK XIII ( Nurul,Nhieta,Ismail,Taufik) I - 1

B. Berat jenis kering permukaan jenuh (saturated surface dry)

Berat jenis kering permukaan jenuh ialah berat jenis yang

memperhitungkan volume pori yang hanya dapat diresapi oleh aspal

ditambah dengan volume partikel.

Rumus perhitungan :

CB

BBJ SSD −

= ................................................... (1. 2)

C. Berat jenis semu (apparent specific gravity)

Berat jenis semu ialah berat jenis yang memperhitungkan volume

partikel saja tanpa memperhitungkan volume pori yang dapat dilewati

oleh air.

Rumus perhitungan :

CA

ABJ

−=semu

....................................................... (1. 3)

D. Penyerapan air (water absorpsi)

Penyerapan air adalah perbandingan perubahan berat agregat

karena penyerapan air oleh pori-pori dengan berat agregat pada kondisi

kering.

Rumus perhitungan :

%100xA

ABairPenyerapan

−= .......................... (1. 4)

Keterangan :

A = Berat contoh kering oven (gram).

B = Berat contoh kering permukaan (gram).

C = Berat contoh dalam air (gram).

I -


1.1.3. Alat dan Bahan yang Digunakan

A. Alat yang digunakan

a. Keranjang kawat dengan ukuran 3,35 mm atau 2,36 mm (No.6 atau No.8)

dengan kapasitas kira-kira 5 kg.

b. Tempat air dengan kapasitas dan bentuk yang sesuai untuk pemeriksaan.

c. Timbangan dengan kapasitas 5 kg dan ketelitian 0,1 % dari berat contoh

yang ditimbang dan dilengkapi dengan alat penggantung keranjang.

d. Oven yang dilengkapi dengan pengatur suhu untuk memanasi sampai

(110 ± 5)°C.

e. Saringan 3/4”, No. 4.

f. Kain lap.

g. Talam

B. Bahan yang digunakan

a) Benda uji adalah agregat yang lolos pada saringan 3/4” dan tertahan pada

saringan No. 4 diperoleh dari alat pemisah contoh atau cara perempat

sebanyak 2500 gram.

b) Air Suling.


Pers

iapan

Menyiapkan peralatan :Keranjang kawat.Tempat air.Timbangan.Oven.Saringan 3/4", No. 4.Kain lap.Talam

Menyiapkan bahan :

Agregat yang lolos saringan 3/4" dan tertahan pada saringan No. 4 diperoleh dari alat pemisah contoh sebanyak 2500 gram.Air suling

Mencuci benda uji untuk menghilangkan debu atau bahan-bahan lain yang melekat pada permukaan agregat.Mengeringkan benda uji dalam oven pada suhu 105C sampai beratnya tetap.

Pro

ses

peng

ujia

nMendinginkan benda uji pada suhu kamar selama 1-3 jam, kemudian menimbang dengan timbangan ketelitian 0,5 gram.

Merendam benda uji dalam air pada suhu kamar selama 24 4 jam.Mengeluarkan benda uji dari dalam air dan mengeringkannya dengan kain lap sampai selaput air pada permukaan hilang, untuk butiran yang besar harus satu persatu. Menimbang benda uji dalam keranjang kawat (lalu mengguncangkan keranjang untuk mengeluarkan udara yang tersekap dan menentukan beratnya dalam air. Mengukur suhu air untuk penyesuaian perhitungan pada suhu standar (25C).A

nalis

a h

asi

lPerhitungan berat jenis dan penyerapan agregat kasar : Equation.3 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Equation.3

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Equation.3 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Equation.3

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1.1.4. Prosedur Percobaan

A. Diagram Alir Prosedur

s

Gambar 1.1. Flow Chart Pengujian Berat Jenis dan Penyerapan Agregat Kasar.

I -


B. Uraian Prosedur

a. Mencuci benda uji untuk menghilangkan debu atau bahan-bahan lain

yang melekat pada permukaan.

b. Mengeringkan benda uji dalam oven pada suhu 105°C sampai beratnya

tetap.

c. Mendinginkan benda uji pada suhu kamar selama 1-3 jam, kemudian

menimbangnya dengan timbangan ketelitian 0,5 gram.

d. Merendam benda uji dalam air pada suhu kamar selama 24 ± 4 jam.

e. Mengeluarkan benda uji dari dalam air, dan mengeringkannya dengan

kain lap sampai selaput air pada permukaan hilang, untuk butiran yang

besar harus satu persatu.

f. Menimbang benda uji dalam keranjang, mengguncangkan keranjang

untuk mengeluarkan udara yang tersekap dan beratnya ditentukan

dalam air. Mengukur suhu air untuk penyesuaian perhitungan pada suhu

standar (25°C).

1.1.5. Spesifikasi Pengujian

Tabel 1.1. Data spesifikasi berat jenis dan penyerapan air.

M inimum M ak s imum

Berat jenis kering oven (bulk specific grav ity). 2.5 -

Berat jenis kering permukaan jenuh (saturated surface dry) 2.5 -

Berat jenis semu (apparent specific grav ity) 2.5 -

Penyerapan air (w ater absorpsi) - 3.0%

Spe s ifik as iPe rcobaan


1.1.6. Data Pengujian

Tabel 1.2. Pengujian berat jenis dan penyerapan agregat kasar.

Keterangan Rumus I II Rata-rata

Berat sampel kering oven. A 2473,70 2489,30 2481,50

Berat sampel kering permukaan. B 2519,50 2533,00 2526,25

Berat sampel dalam air. C 1589,00 1597,00 1593,00

Berat jenis kering oven (bulk specific gravity). CB

A

− 2,66 2,66 2,66

Berat jenis kering permukaan jenuh (saturated surface dry). CB

B

− 2,71 2,71 2,71

Berat jenis semu (apparent specific gravity). CA

A

− 2,80 2,79 2,79

Penyerapan air (water absorption )

%100xA

AB−1,85 % 1,76 % 1,81 %

1.1.7. Analisa Data

a. Pengujian 1

a. Berat jenis kering oven (bulk specific gravity) :

BJ bulk = CB

A

−

= grgr

gr

00,158950,2519

70,2473

−

= 2,66

b. Berat jenis kering permukaan jenuh (saturated

surface dry) :

I -


BJ SSD = CB

B

−

= grgr

gr

00,158950,2519

50,2519

−

= 2,71

c. Berat jenis semu (apparent specific gravity) :

BJsemu = CA

A

−

= grgr

gr

00,.158970,2473

70,2473

−

= 2,80

d. Penyerapan air (water absorpsi):

Penyerapan air =%100x

A

AB −

=%100

70,2473

70,247350,2519x

gr

grgr −

= 1,85 %

b. Pengujian 2

a. Berat jenis kering oven (bulk specific gravity) :

BJ bulk = CB

A

−

= grgr

gr

00,159700,2533

30,2489

−

= 2,66

b. Berat jenis kering permukaan jenuh (saturated surface dry) :

BJ SSD = CB

B

−


= grgr

gr

00,159700,2533

00,2533

−

= 2,71

c. Berat jenis semu (apparent specific gravity) :

BJsemu = CA

A

−

= grgr

gr

00,159730,2489

30,2489

−

= 2,79

d. Penyerapan air (water absorpsi):

Penyerapan air =%100x

A

AB −

=%100

30,2489

30,248900,2533x

gr

grgr −

= 1,76 %

c. Rata – rata

a. Berat jenis kering oven (bulk specific gravity) rata-rata :

BJ bulk = 2

66,266,2 +

= 2,66

b. Berat jenis kering permukaan jenuh (saturated

surface dry) rata-rata:

BJ SSD = 2

71,271,2 +

= 2,71

c. Berat jenis semu (apparent specific gravity) rata-rata:

BJ semu = 2

79,280,2 +

I -


= 2,79

d. Penyerapan air (water absorpsi )rata-rata:

Penyerapan air = 2

%76,1%85,1 +

= 1,81 %

Tabel 1.3. Rekapitulasi pengujian berat jenis dan penyerapan agregat

kasar.

Hasil

pe me riksaan M in. M ax.

1 Berat jenis kering oven (bulk specif ic gravity). 2,66 2,5 -

2 Berat jenis kering permukaan jenuh (saturated surface dry). 2,71 2,5 -

3 Berat jenis semu (apparent specif ic gravity). 2,79 2,5 -

4 Penyerapan air (water absorpsi) 1,81 - 3,0 %

Spe s ifikasiPe me riksaanNo

1.1.8. Kesimpulan

Dari hasil dan analisa sampel agregat kasar di Laboratorium

Rekayasa Transportasi Jurusan Sipil Fakultas Teknik Universitas

Hasanuddin, diperoleh hasil rata-rata yaitu :

A. Berat jenis kering oven (bulk specific gravity) : 2,66

B. Berat jenis kering permukaan jenuh

(saturated surface dry) : 2,71

C. Berat jenis semu (apparent specific gravity) : 2,79

D. Penyerapan air (water absorpsi) : 1,81 %


Benda uji yang digunakan dalam pemeriksaan berat jenis dan

penyerapan agregat kasar telah memenuhi spesifikasi (lihat pada Tabel 1.1),

berat jenis yang disyaratkan minimal 2,5 dan penyerapan air maksimal

3,0 %.

I -



1.2. INDEKS KEPIPIHAN DAN KELONJONGAN AGREGAT

(Flakiness and Elongation Index).

1.2.1. Tujuan

Pemeriksaan ini dimaksudkan untuk mengetahui bentuk dari agregat

yang akan dipergunakan pada proses pekerjaan jalan.


Partikel agregat berbentuk pipih dapat merupakan hasil dari mesin

pemecah batu ataupun memang merupakan sifat dari agregrat tersebut yang

jika dipecahkan cenderung berbentuk pipih. Agregat pipih yaitu agregat

yang lebih tipis dari 0,6 kali diameter rata-rata. Indeks kepipihan (flakiness

index) adalah berat total agregat yang lolos slot dibagi dengan berat total

agregat yang tertahan pada ukuran nominal tertentu.

Agregat berbentuk pipih mudah pecah pada waktu pencampuran,

pemadatan ataupun akibat beban lalu lintas, oleh karena itu banyaknya

agregat pipih ini dibatasi dengan menggunakan nilai indeks kepipihan yang

disyaratkan.

Agregat berbentuk lonjong dapat ditemui di sungai-sungai atau

bekas dari endapan sungai. Agregat dikatakan lonjong jika ukuran

terpanjangnya > 1,8 kali diameter rata-rata. Indeks kelonjongan (elongation

I -


index) adalah perbandingan dalam persen dari berat lonjong yang tertahan

terhadap agregat yang tertahan.

Rumus perhitungan :

%100xC

AkepipihanIndeks =

............................... (1.5)

%100xC

BnkelonjongaIndeks =

.............................. (1. 6)

Keterangan :

A = Berat lolos pada alat pengukur kepipihan (gram).

B = Berat lolos pada alat pengukur kelonjongan (gram).

C = Berat total (gram).


A. Percobaan Indeks Kepipihan

a. Alat yang Digunakan

- Saringan 3/4”, 1/2”, dan 3/8”.

- Talam - talam.

- Alat pengukur kepipihan.

- Timbangan dengan ketelitian 0,01 gram.

b. Bahan yang Digunakan

Menyaring agregat dengan menggunakan saringan 3/4”, 1/2”, dan

3/8”. Kemudian memisahkan agregat yang tertahan pada saringan 1/2” dan

3/8” masing-masing sebanyak 500 gram.

B. Percobaan Indeks Kelonjongan

a. Alat yang Digunakan

- Saringan 3/4”, 1/2”, dan 3/8”.

- Talam - talam.

- Alat pengukur kelonjongan.

- Timbangan dengan ketelitian 0,01 gram.


Pers

iapan

Menyiapkan bahan :Menyaring agregat dengan menggunakan saringan 3/4", 1/2", dan 3/8". Kemudian memisahkan agregat yang tertahan pada saringan 1/2" dan 3/8" masing-masing sebanyak 500 gram.

Menyiapkan peralatan :Saringan 3/4", 1/2" dan 3/8".Talam – talam.Alat pengukur kepipihan.Timbangan dengan ketelitian 0,01 gram.

Pro

ses

peng

ujia

nMenyaring agregat dengan menggunakan saringan 3/4", 1/2" dan 3/8".Menimbang agregat yang tertahan pada saringan 1/2" dan 3/8" masing-masing sebanyak 500 gram lalu memasukkannya pada alat pengukur kepipihan.Menimbang agregat yang lolos dan tertahan pada alat pengukur kepipihan.

An

alis

a h

asi

l

b. Bahan yang Digunakan

Menyaring agregat dengan menggunakan saringan 3/4”, 1/2”, dan

3/8”. Kemudian memisahkan agregat yang tertahan pada saringan 1/2” dan

3/8” masing-masing sebanyak 500 gram.


A. Diagram Alir Prosedur Indeks Kepipihan Agregat

Perhitungan indeks kepipihan :

Equation.3 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

Ket : A = Berat lolos pada alat pengukur kepipihan (gram).C = Berat total (gram).

Gambar 1.2 Flow chart pengujian indeks kepipihan agregat kasarMenyiapkan bahan :Menyaring agregat dengan menggunakan saringan 3/4", 1/2", dan 3/8". Kemudian memisahkan agregat yang tertahan pada saringan 1/2" dan 3/8" masing-masing sebanyak 500 gram.

Menyiapkan peralatan :Saringan 3/4", 1/2" dan 3/8".Talam – talam.Alat pengukur kelonjongan.Timbangan dengan ketelitian 0,01 gram.

Pers

iapan

Menyaring agregat dengan menggunakan saringan 3/4", 1/2" dan 3/8".Pro

ses

peng

ujia

n

Menimbang agregat yang tertahan pada saringan 1/2" dan 3/8" masing-masing sebanyak 500 gram lalu memasukkannya pada alat pengukur kelonjongan.

Menimbang agregat yang lolos dan tertahan pada alat pengukur kelonjongan.

Perhitungan indeks kelonjongan :

Equation.3

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

1010008000000320a6002830c010000003d6e0a00000026060f000a00ffffffff0100000000001c000000fb021000070000000000bc02000000000102022253797374656d00d8170966d800000a0021008a010000000001000000bcf31200040000002d01010004000000f0010200030000000000

Ket : B = Berat lolos pada alat pengukur kelonjongan (gram).C = Berat total (gram).

I -


B. Diagram Alir Prosedur Indeks Kelonjongan Agregat


An

alis

a h

asi

l

Perhitungan indeks kelonjongan :

Equation.3

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

1010008000000320a6002830c010000003d6e0a00000026060f000a00ffffffff0100000000001c000000fb021000070000000000bc02000000000102022253797374656d00d8170966d800000a0021008a010000000001000000bcf31200040000002d01010004000000f0010200030000000000

Ket : B = Berat lolos pada alat pengukur kelonjongan (gram).C = Berat total (gram).

Gambar 1.3 Flow Chart Pengujian Indeks Kelonjongan Agregat Kasar

C. Uraian Prosedur Pengujian Kepipihan Agregat Kasar

a. Menyaring agregat dengan

menggunakan saringan 3/4”,

1/2” dan 3/8”.

b. Menimbang agregat yang

tertahan pada saringan 1/2”

dan 3/8” masing-masing

sebanyak 500 gram lalu

memasukkannya pada alat

pengukur kepipihan.

c. Menimbang agregat yang

lolos dan tertahan pada alat

pengukur kepipihan.

d. Menghitung prosentase

kepipihan :

%100xC

AkepipihanIndeks =

Keterangan :

A = Berat lolos pada alat pengukur kepipihan (gram).

I -



D. Uraian Prosedur Pengujian Kelonjongan Agregat Kasar

a. Menyaring agregat dengan menggunakan saringan 3/4”, 1/2”

dan 3/8”.

b. Menimbang agregat yang tertahan pada saringan 1/2” dan 3/8”

masing-masing sebanyak 500 gram lalu memasukkannya pada

alat pengukur kelonjongan.

c. Menimbang agregat yang lolos dan tertahan pada alat

pengukur kelonjongan.

d. Menghitung prosentase kelonjongan :

%100xC

BnkelonjongaIndeks =

Keterangan :

B = Berat lolos pada alat pengukur kelonjongan (gram).



Tabel. 1.4. Data spesifikasi indeks kepipihan dan kelonjongan agregat

kasar

Minimum Maksimum

Indeks kepipihan agregat - 25%

Indeks kelonjongan agregat - 25%

SpesifikasiPercobaan


Tabel 1.5. Pengujian indeks kepipihan agregat


NoGradasi Saringan

Ukuran Thickness Gauge

Berat Lolos Berat Tertahan Berat Total

Lebar Panjang Slot (Gram) Slot (Gram) (Gram)

(mm) (mm) A B C

I 3/4" 1/2" 6,67 38,20 20,30 479.70 500

II 1/2" 3/8" 4,80 25,40 27,80 472,2 500

T o t a l 48,1 951,90 1000

I 3/4" 1/2" 6,67 38,20 32,80 467,20 500

II 1/2" 3/8" 4,80 25,40 37,70 462,30 500

T o t a l 70,50 929,50 1000

Tabel 1.6. Pengujian indeks kelonjongan agregat

NoGradasi Saringan

Ukuran Thickness Gauge

Berat LolosBerat

TertahanBerat Total

Lebar Panjang Slot (Gram) Slot (Gram) (Gram)

(mm) (mm) A B C

I 3/4" 1/2" 10,00 14,00 206,60 293,40 500

II 1/2" 3/8" 6,30 10,00 306,00 194,00 500

T o t a l 512,60 487,40 1000

I 3/4" 1/2" 10,00 14,00 107,30 392,70 500

II 1/2" 3/8" 6,30 10,00 254,40 245,60 500

T o t a l 361,70 638,30 1000

1.2.7. Analisa Data

i.Indeks Kepipihan

a. Pengujian 1 = %100x

C

A

I -


= %100

00,1000

10,48x

= 4,81 %

b. Pengujian 2 = %100x

C

A

= %100

00,1000

50,70x

= 7,05 %

c. Pengujian rata-rata = 2

%05,7%81,4 +

= 5,93 %

B. Indeks kelonjongan

a. Pengujian 1 = %100x

C

A

= %100

00,1000

60,512x

= 51,26 %

b. Pengujian 2 = %100x

C

A

= %100

00,1000

70,361x

= 36,17 %

c. Pengujian rata-rata = 2

%17,36%26,51 +

= 43,71 %

1.2.8. Kesimpulan




Hasanuddin, diperoleh hasil rata-rata :

A. Indeks kepipihan = 5,93 %

B. Indeks kelonjongan = 43,71%

Benda uji yang digunakan dalam pemeriksaan indeks kepipihan

agregat kasar telah memenuhi spesifikasi (lihat pada Tabel 1.4), indeks

kepipihan dan kelonjongan yang disyaratkan maksimal 25 %.

I -


1.3. PENGUJIAN KEAUSAN AGREGAT KASAR

1.3.1. Tujuan

Pemeriksaan ini bertujuan untuk menentukan ketahanan agregat


kasar terhadap keausan dengan menggunakan mesin Los Angeles. Keausan

dinyatakan dengan perbandingan antara berat bahan aus lolos saringan No.

12 terhadap berat semula, dalam persen.


Ketahanan agregat terhadap penghancuran (degradasi) diperiksa

dengan menggunakan percobaan Abrasi Los Angeles (abration los angeles

test).

Nilai tinggi menunjukkan banyaknya benda uji yang hancur akibat

putaran alat yang mengakibatkan tumbukan dan gesekan antar partikel dan

dengan bola-bola baja, nilai abrasi > 40 % menunjukkan agregat tidak

mempunyai kekerasan cukup untuk digunakan sebagai material lapisan

perkerasan. Nilai abrasi < 40 %, baik sebagai bahan lapis permukaan dan

lapis pondasi atas. Nilai abrasi < 50 %, dapat dipergunakan sebagai bahan

lapisan lebih bawah.

Rumus perhitungan :

%100)(

xA

BAKeausan

−= ............................................. (1.7)

Keterangan :

A = Berat sampel sebelum keausan (gram).

B = Berat sampel sesudah keausan tertahan saringan No.12 (gram).


A. Peralatan Percobaan

a. Mesin Los Angeles.

I -


Mesin terdiri dari silinder baja tertutup pada kedua sisinya dengan

diameter 71 cm (28”) panjang dalam 50 cm (20”). Silinder bertumpu

pada dua poros pendek yang tak menerus dan berputar pada poros

mendatar. Silinder berlubang untuk memasukkan benda uji. Penutup

lubang terpasang rapat sehingga permukaan dalam silinder tidak

terganggu. Pada bagian dalam silinder terdapat bilah baja melintang

penuh setinggi 8,9 cm (3,56“).

b. Saringan No.12, 3/4”, 1/2”, 3/8”, dan saringan –

saringan lainnya seperti tercantum dalam tabel 1.7.

c. Timbangan, dengan ketelitian 5 gram.

d. Bola-bola baja dengan diameter rata-rata 4,68 cm (1

7/8”) dari berat masing – masing antara 390 gram

sampai 445 gram.

e. Oven yang dilengkapi dengan pengatur suhu untuk

memanasi sampai (100 ± 5)°C.

B. Benda uji

a. Berat dan gradasi benda uji sesuai daftar pada tabel

1.7.

b. Benda uji dibersihkan dan dikeringkan dalam oven

pada suhu (110 ± 5)°C sampai berat tetap.

Tabel 1.7. Jenis gradasi agregat kasar


Pro

ses

peng

ujia

nA

nalis

a h

asi

l

Gambar 1.4 Flow Chart Pengujian Keausan Agregat Kasar.

Pers

iapan Menyiapkan bahan :

Chipping lolos saringan 3/4" dan tertahan pada saringan 1/2" sebanyak 2500 gram.Chipping lolos saringan 1/2" dan tertahan pada saringan 3/8" sebanyak 2500 gram.

Menyiapkan alat :Mesin Los Angeles.Saringan No. 12, 3/4", 1/2", 3/8".Timbangan.Bola - bola baja 4,68 cm.Oven.

Ukuran saringan Berat dan gradasi benda uji (gram)

Lewat Tertahan A B C D E F G

(mm) (mm)

76,2 63,5 2500

63,5 50,8 2500

50,8 38,1 5000 5000

38,1 25,4 1250 5000 5000

25,4 19,05 1250 5000

19,05 12,7 1250 2500

12,7 9,51 1250 2500

9,51 6,35 2500

6,35 4,75 2500

4,75 2,36 5000

Jumlah bola 12 11 8 6 12 12 12

Berat bola (Gram) 5000 4584 3330 2500 5000 5000 5000

+ 25 + 25 + 20 + 15 + 25 + 25 + 25

Keterangan :

= Gradasi yang digunakan



Benda uji dan bola-bola baja dimasukkan ke dalam mesin Los Angeles.Memutar mesin dengan kecepatan 30 sampai 33 rpm sebanyak 500 putaran

Setelah selesai pemutaran, mengeluarkan benda uji dari mesin kemudian menyaring dengan saringan No. 12. Mencuci bersih butiran yang tertahan di atasnya, lalu mengeringkannya dalam oven dengan suhu (110 5)C sampai berat tetap.

Perhitungan keausan dengan mesin Los Angeles :

Equation.3

01050000020000000b0000004571756174696f6e2e3300000000000000000000100000d0cf11e0a1b11ae1000000000000000000000000000000003e000300feff0900060000000000000000000000010000000100000000000000001000000200000001000000feffffff0000000000000000fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffdffffff04000000feffffff05000000feffffff06000000feffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff52006f006f007400200045006e00740072007900000000000000000000000000000000000000000000000000000000000000000000000000000000000000000016000500ffffffffffffffff0200000002ce020000000000c00000000000004600000000000000000000000070ced8ded059c90103000000800400000000000001004f006c00650000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000a000201ffffffffffffffffffffffff000000000000000000000000000000000000000000000000000000000000000000000000000000001400000000000000010043006f006d0070004f0062006a00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000120002010100000004000000ffffffff00000000000000000000000000000000000000000000000000000000000000000000000001000000660000000000000003004f0062006a0049006e0066006f0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000012000200ffffffffffffffffffffffff000000000000000000000000000000000000000000000000000000000000000000000000030000000600000000000000feffffff02000000fefffffffeffffff05000000060000000700000008000000090000000a0000000b0000000c0000000d0000000e000000feffffff1000000011000000feffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff01000002080000000000000000000000000000003071e203000000000000000000000000000000000000000000000000000000000000000000000000000000000100feff030a0000ffffffff02ce020000000000c000000000000046170000004d6963726f736f6674204571756174696f6e20332e30000c0000004453204571756174696f6e000b0000004571756174696f6e2e3300f439b271000000000000000000000000000000000000000000000000000000000000000000000000000000000300040000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000ffffffff030000000400000001000000ffffffff000000000000000016110000b90300005a0200000100090000032d0100000300150000000000050000000902000000000400000002010100050000000102ffffff00040000002e01180005000000310201000000050000000b0200000000050000000c026003800f1200000026060f001a00ffffffff000010000000c0ffffffacffffff400f00000c0300000b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0010000000fb02c0fe0000000000009001000000020002001053796d626f6c0002040000002d01010004000000f001020008000000320a49013708010000002d0008000000320a20022605010000003d000a00000026060f000a00ffffffff01000000000010000000fb021000070000000000bc02000000000102022253797374656d0000040000002d01020004000000f0010100030000000000

Keterangan :

A = Berat sampel sebelum keausan (gram).

B = Berat sampel sesudah keausan tertahan saringan no. 12 (gram).

I -


B. Uraian Prosedur

a. Memasukkan benda uji dan bola-bola

baja ke dalam mesin Los Angeles.

b. Memutar mesin dengan kecepatan 30

sampai 33 rpm sebanyak 500 putaran

(digunakan gradasi B).

c. Setelah selesai pemutaran, kemudian


mengeluarkan benda uji dari mesin

kemudian menyaringnya dengan saringan

No. 12. Mencuci bersih butiran yang

tertahan di atasnya, kemudian

mengeringkannya dalam oven dengan

suhu (110 ± 5)°C sampai berat tetap.


Tabel. 1.8. Data spesifikasi pengujian mesin Los Angeles.

Minimum Maksimum

Pengujian mesin Los Angeles-

40%



Tabel 1.9. Pengujian keausan agregat kasar.

Gradasi Saringan No. Sampel

I II

Lolos Tertahan A B C D

Berat Sebelum (gr)

Berat Sesudah (gr)

Berat Sebelum (gr)

Berat Sesudah (gr)

3/4" 1/2" 2500 3911,70 2500 4219,20

1/2" 3/8" 2500 2500

Jumlah Berat (gram) 5000 5000

Berat tertahan Saringan No. 12 (gram)

3911,70 4219,20

I -


1.3.7. Analisa Data

A. Prosentase keausan sampel I =%100x

A

BA −

= %100

5000

70,39115000x

−

= 21,78 %

B. Prosentase keausan sampel II=%100x

A

BA −

=%100

5000

20,42195000x

−

= 15,62 %

C. Prosentase keausan rata-rata =

2

IIeausanKIeausanK +

= 2

%62,15%78,21 +

= 18,69 %

1.3.8 Kesimpulan



Hasanuddin, diperoleh hasil keausan rata-rata sebesar 18,69 %.

Benda uji yang digunakan dalam pemeriksaan keausan agregat kasar

telah memenuhi spesifikasi (lihat pada Tabel 1.8), prosentase keausan yang

disyaratkan maksimal 40 %.


I -



I -


1.4. ANALISA SARINGAN AGREGAT KASAR (Shieve Analysis).

1.4.1. Tujuan

Pemeriksaan ini dimaksudkan untuk menentukan pembagian butir

(gradasi) agregat kasar dengan menggunakan saringan.


Gradasi atau distribusi partikel-partikel berdasarkan ukuran agregat

merupakan hal yang penting dalam menentukan stabilitas perkerasan.

Gradasi agregat mempengaruhi besarnya rongga antar butir yang akan

menentukan stabilitas dan kemudahan dalam proses pelaksanaan.

Gradasi agregat diperoleh dari hasil analisa saringan dengan

menggunakan 1 set saringan dimana yang paling kasar diletakkan di atas dan

yang paling halus diletakkan paling bawah. Jika agregat kasar itu “bersih”,

tidak / sedikit sekali mengandung butiran halus dapat digunakan analisa

kering. Berdasarkan besar partikel-partikel agregat kasar, agregat > 4.75 mm

menurut ASTM atau > 2 mm AASHTO.

Gradasi agregat dapat dibedakan atas :

A. Gradasi seragam (uniform graded).

Gradasi seragam (uniform graded) adalah agregat dengan ukuran

yang hampir sama/sejenis atau mengandung agregat halus yang sedikit

jumlahnya sehingga tidak dapat mengisi rongga antar agregat. Gradasi

seragam disebut juga gradasi terbuka. Agregat dengan gradasi seragam

akan menghasilkan lapisan perkerasan dengan sifat permeabilitas tinggi,

stabilitas kurang, berat volume kecil.

B. Gradasi rapat (dense graded).

Gradasi rapat (dense graded) merupakan campuran agregat kasar dan

halus dalam porsi yang berimbang, sehingga dinamakan juga agregat


bergradasi baik (well graded). Agregat dengan gradasi rapat akan

menghasilkan lapisan perkerasan dengan sifat, stabililitas tinggi, berat

volume besar.

C. Gradasi buruk/jelek (poorly graded).

Gradasi buruk/jelek (poorly graded) adalah campuran agregat yang

tidak memenuhi 2 kategori di atas, agregat bergradasi buruk yang umum

digunakan untuk lapisan perkerasan lentur yaitu gradasi celah (gap

graded), yaitu campuran agregat dengan 1 fraksi hilang atau 1 fraksi

sedikit sekali, atau dikenal dengan agregat bergradasi senjang.

Rumus perhitungan :

a. Komulatif tertahan = Komulatif

tertahan + Berat tertahan

b. Persen total tertahan =

%100xagregatTotal

tertahankomulatifJumlah

c. Persen lolos = 100 % - Persen total

tertahan


A. Alat yang Digunakan

a. Timbangan dan neraca dengan ketelitian 0,2

% dari berat benda uji.

b. Satu set saringan : 1/2” ; 3/8” ; No. 4 ; No.

8 ; No.30 ; No. 50 ; No.100 ; No.200 ; PAN

(standar ASTM).

c. Oven yang dilengkapi pengatur suhu untuk

memanasi sampai (110 ± 5)° C.

d. Mesin pengguncang saringan (shieve shaker).

e. Talam-talam.

Menyiapkan bahan :Agregat Kasar (chipping)

Diperoleh dari alat pemisah contoh atau cara perempat sebanyak 1500 kg yang lolos saringan 1/2".

Pers

iapanMenyiapkan peralatan :

Timbangan dan neracaSatu set saringanOvenAlat pemisah contohMesin penguncang saringan (shieve shaker)Talam – talamKuas, sikat kuningan, sendok dan lain-lain

Pro

ses

peng

ujia

nMengeringkan benda uji dalam oven dengan suhu (110 5) C, sampai berat tetap.

Menimbang kosong masing-masing. Saringan. Menyaring benda uji lewat susunan saringan dengan ukuran saringan paling besar ditempatkan paling atas. Mengguncang saringan dengan mesin pengguncang selama 15 menit. Mendiamkan selama 5 menit, lalu menimbang kembali saringan beserta agregat yang tertahan.

An

alis

a h

asi

lPerhitungan analisa saringan agregat kasar :- Kumulatif tertahan = Kumulatif tertahan + Berat tertahan- Persen total tertahan = Kumulatif tertahan / Total agregat x 100 %- Persen lolos = 100 - Persen total tertahan

I -


f. Kuas, sikat kuningan, sendok dan lain-lain

B. Bahan yang Digunakan

Bahan yang digunakan adalah agregat kasar (batu pecah) sebanyak

1500 gram, yang lolos saringan 1/2”.




Gambar 1.5 Flow Chart Pengujian Analisa Saringan Agregat Kasar.No.

Saringan Minimum Ideal Maksimum

1/2" 100 100.0 100

3/8" 80 90 100

4 55 65 75

8 35 42.5 50

30 18 24 29

50 13 18 23

100 8 12 16

200 4 7 10

Spesifikasi ( % )

B. Uraian Prosedur

a. Mengeringkan benda uji dalam oven

dengan suhu (110 ± 5)° C, sampai berat

tetap.

b. Menimbang kosong masing-masing

saringan.

c. Menyaring benda uji lewat susunan

saringan dengan ukuran saringan paling

besar ditempatkan paling atas.

d. Mengguncang saringan dengan mesin

pengguncang (shieve shaker) selama 15

menit.

e. Mendiamkan selama 5 menit agar debu

yang ada di dalam saringan yang lebih

halus dapat mengendap.

f. Menimbang kembali masing-masing

saringan beserta agregat yang tertahan.

g. Menghitung prosentase tertahan dan lolos

agregat kasar.


Tabel 1.10. Data spesifikasi analisa saringan untuk gradasi III

I -


Ket : Spesifikasi Standarisasi Bina Marga


Tabel 1.11. Pengujian analisa saringan agregat kasar

200 42.00 1478.60 98.57 1.43

PAN 21.40 1500.00 100.00 0.00

50 26.30 1420.40 94.69 5.31

100 16.20 1436.60 95.77 4.23

1328.20 88.55 11.45

30 65.90 1394.10 92.94 7.06

8 91.30

378.60 25.24 74.76

4 858.30 1236.90 82.46 17.54

3/8" 378.60

1/2" 0.00 0.00 0.00 100.00

No Saringan

Berat Tertahan (gr)

B C D EA

Komulatif Tertahan (gr)

Persen Total Tertahan (%)

Persen Lolos (%)

1.4.7. Analisa Data

Contoh :

Komulatif tertahan = C + B


= 378,60 gram + 858,30 gram

= 1236,90 gram

Prosentase tertahan = %100x

agregatTotal

C

=

%10000,1500

60,378x

gram

gram

= 25,24 %

Prosentase lolos = 100,00 % – D

= 100,00 % – 25,24 %

= 74,76%

Ket :

A = Nomor saringan D = Prosentase total tertahan

B = Berat tertahan E = Persen Lolos

C = Komulatif tertahan

1.4.8. Kesimpulan

Dari pemeriksaan dan analisa sampel agregat kasar di Laboratorium


Hasanuddin, maka diperoleh hasil prosentase lolos :

Saringan 1/2” = 100,00 %

Saringan 3/8” = 74,76 %

Saringan No.4 = 17,54 %






Dari hasil di atas dapat disimpulkan bahwa gradasi agregat kasar

masuk dalam batasan gradasi III pada penggabungan agregat (lihat Tabel

1.10), sehingga agregat kasar tersebut dapat digunakan untuk bahan

pekerjaan kontruksi jalan.

I -



I -



1.5. PENGUJIAN KELEKATAN AGREGAT TERHADAP ASPAL

1.5.1. Tujuan

Pemeriksaan ini bertujuan untuk menentukan besarnya kelekatan

agregat terhadap aspal melalui percobaan di Laboratorium.


Kelekatan agregat terhadap aspal adalah prosentase luas permukaan

batuan tertutup aspal terhadap keseluruhan luas permukaan agregat.

Faktor yang mempengaruhi lekatnya agregat dan aspal dapat

dibedakan menjadi 2 bagian yaitu :

A. Sifat mekanis yang tergantung dari :

a. Pori-pori dan absorpsi.

b. Bentuk dan tekstur permukaan.

c. Ukuran butiran.

B. Sifat kimiawi dari agregat.

Agregat berpori berguna untuk menyerap aspal sehingga ikatan antara

aspal dan agregat baik. Tetapi terlalu banyak pori dapat mengakibatkan

I -


terlalu banyak aspal yang terserap yang berakibat lapisan aspal menjadi

tipis.

Agregat berbentuk kubus dan kasar lebih baik mengikat aspal dari

pada agregat berbentuk bulat dan halus. Permukaan yang kasar akan

memberikan ikatan dengan aspal lebih baik dari pada agregat dengan

permukaan licin.

Disamping hal tersebut di atas, daya lekat aspal dipengaruhi juga

oleh sifat agregat terhadap air. Grani dan batuan yang mengandung silica

merupakan agregat bersifat hydrophilic yaitu agregat yang senang terhadap

air. Agregat tersebut tidak baik digunakan untuk lapisan perkerasan

beraspal, karena mudah terjadi stripping yaitu lepasnya lapis aspal dari

agregat akibat pengaruh air.

Sebaliknya agregat seperti dioritandesit disebut agregat

hydrophobic, adalah agregat yang tidak mudah terikat dengan air sehingga

ikatan antara aspal dan agregat cukup baik dan stripping yang terjadi kecil

sekali.

Pemeriksaan agregat untuk daya lekatnya terhadap aspal dilakukan

dengan percobaan stripping mengikuti PB 0205-76 atau AASHTO T182-82.

Kelekatan agregat terhadap aspal sangat berpengaruh terhadap

kekuatan dari campuran material (mix design) dalam pembuatan jalan dan

sebagainya.


1. Alat yang Digunakan

1. Wadah untuk mengaduk, kapasitas minimal 500 ml.

2. Timbangan dengan kapasitas 200 gram dan ketelitian 0,1 gram.

3. Tabung gelas kimia dengan kapasitas 600 ml.

4. Saringan 6,3 mm (1/4”) dan 9,5 mm (3/8”).

5. Termometer.

6. Air suling dengan pH 6,0 – 7,0.

7. Spatula.


2. Bahan yang Digunakan

Sampel merupakan agregat yang lolos saringan 9,5 mm (3/8”)

dan tertahan pada saringan 6,3 mm (1/4”), sebanyak 100 gram.



Gambar 1.6 Flow Chart Pengujian Kelekatan Agregat terhadap Aspal.

I -


B. Uraian Prosedur

a. Menyaring agregat yang lolos saringan 9,5 mm (3/8”) dan

tertahan pada saringan 6,3 mm (1/4”), sebanyak 100 gram.

b. Mencuci agregat dengan air suling. Kemudian mengeringkan

pada suhu 135-149o C hingga beratnya tetap.

c. Memasukkan sampel ke dalam wadah. Memanaskan wadah

yang berisi sampel yang telah diberi aspal sebanyak 50,5 ±

0,2 gr, selama 1 jam dalam oven. Mengaduk sampel selama ±

2 menit.

d. Memasukkan adukan aspal dan agregat tadi ke dalam oven

pada suhu 60ºC selama 2 jam. Setelah 2 jam, mengeluarkan

adukan beserta wadahnya dari oven dan mengaduknya lagi

hingga dingin (suhu ruang).

e. Memindahkan sampel yang sudah terselaput aspal ke dalam

tabung gelas kimia 600 ml. Segera menambahkan air suling

sebanyak 400 ml dan membiarkannya pada suhu ruang

selama 16 hingga 18 jam.

f. Memeriksa luas permukaan sampel yang sudah terselaput

aspal dengan memperkirakan luas permukaan sampel yang


terselimuti telah aspal.


Tabel. 1.12. Data spesifikasi kelekatan agregat terhadap aspal.

Minimum Maksimum

Kelekatan agregat terhadap aspal 95% 100%



Tabel 1.13 Pengujian kelekatan agregat terhadap aspal.

Nomor % Kelekatan

1 > 95

2 > 95

3 > 95

4 > 95

5 > 95

6 > 95

7 > 95

8 > 95

9 > 95

10 > 95

Rata-rata > 95

I -


1.5.7 Analisa Data

Dari hasil pengujian diperoleh nilai kelekatan aspal > 95% sebesar

100% ,sehingga diperoleh nilai kelekatan rata-rata agregat terhadap aspal

sebasar > 95 %.

1.5.8 Kesimpulan

Dari hasil pemeriksaan kelekatan agregat terhadap aspal di

Laboratorium Rekayasa Transportasi Jurusan Sipil Fakultas Teknik

Universitas Hasanuddin, diperoleh nilai kelekatan rata-rata sebesar > 95 %.

Benda uji yang digunakan dalam pemeriksaan kelekatan agregat

terhadap aspal memenuhi spesifikasi (lihat pada Tabel 1.13), nilai kelekatan

yang disyaratkan minimal 95 %.


I -


1.6. PENGUJIAN KEKUATAN AGREGAT TERHADAP TUMBUKAN

( Aggregate Impact Value ).

1.6.1. Tujuan

Pemeriksaan ini bertujuan untuk menentukan nilai kekuatan agregat

terhadap tumbukan.


Salah satu metode yang dikembangkan untuk menguji kekuatan

batuan terhadap beban lalu lintas adalah dengan melakukan simulasi

pemberian beban terhadap suatu sampel agregat dengan cara ditumbuk

(impact). Prisipnya adalah sampel agregat ditumbuk dengan alat khusus

selama beberapa waktu. Agregat yang hancur kemudian ditimbang dan

dibandingkan dengan berat semula sampel. Perbandingan ini merupakan


nilai dari aggregate impact value (AIV).

Proses penumbukan ini adalah proses dasar pembuatan agregat di

aggregat crushing plant. Biasanya beban tumbukan ini dikombinasikan

dengan beban tekanan (crushing) baik dari arah lateral maupun aksial.

Beban tumbukan yang diterima oleh agregat pada konstruksi jalan dimulai

dari aggregat crushing plant. Kemudian di laboratorium selain melalui

pengujian ini juga pada pembuatan campuran aspal dan agregat dalam mix

design.

Rumus :

%100xA

BAIV =

.......................................................... (1.11)

Keterangan :

AIV = Aggregate impact value (%).

A = Berat awal sampel (gram).

B = Berat sampel lolos saringan No.8 (gram).


1. Alat yang Digunakan

a. Saringan 1/2”, 3/8”, dan No.8.

b. Aggregate impact machine.

c. Timbangan dengan ketelitian 0,1 gram.

d. Talam- talam.

2. Bahan yang Digunakan

Agregat yang lolos pada saringan 1/2” dan tertahan pada saringan

3/8” sebanyak 1000 gram.

Pers

iapan

Menyiapkan alat :

Saringan : 1/2", 3/8" dan No.8.Aggregate impact machineTimbanganTalam-talam

Menyiapkan bahan :

Menyaring agregat yang lolos saringan 1/2" dan tertahan 3/8" sebanyak 1000 gram

Menyaring agregat sebanyak 1000 gram, dengan menggunakan saringan 1/2" dan 3/8".

Memasukkan sampel pada alat penumbuk kemudian mengatur ketinggian palu agar jarak antara bidang kontak palu dengan permukaan sampel 380 ? 5 mm.

I -


1.6.4.1.1.1.1. Prosedur Percobaan

1. Diagram Alir Prosedur


Pro

ses

peng

ujia

n

Melepas pengunci palu dan membiarkan palu jatuh bebas ke sampel. Mengangkat palu pada posisi semula dan melepaskan kembali (jatuh bebas). Melakukan tumbukan sebanyak 15 kali dengan tenggang waktu tumbukan tidak lebih dari satu detik.

Menyaring sampel dengan saringan No. 8, kemudian menimbang yang lolos dari saringan No.8. Menghitung :

Equation.3 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A = Berat awal sampel (gram). B = Berat sampel yang lolos saringan No. 8 (gram).

An

alis

a h

asi

lGambar 1.7. Flow chart pengujian aggregate impact value

2. Uraian Prosedur

a. Memasukkan sampel dalam cup (cylindrial steel cup)

sedemikian rupa hingga tidak melebihi tinggi cup (50 mm).

Memasukkan sampel ke dalam dengan sedikit menekan lalu

memadatkannya dengan tangan.

b. Meletakkan aggregate impact machine pada lantai dasar yang

keras.

c. Meletakkan cup berisi sampel pada tempatnya dan

memastikan letak cup sudah baik dan tidak akan bergeser

akibat tumbukan palu.

d. Mengatur ketinggian palu agar jarak antara bidang kontak

palu dengan permukaan sampel 380 ± 5mm.

e. Melepaskan pengunci palu dan biarkan palu jatuh bebas ke

sampel. Mengangkat palu pada posisi semula dan melepas

I -


kembali (jatuh bebas). Melakukan tumbukan sebanyak 15

kali dengan selisih waktu penumbukan tidak lebih dari satu

detik.

f. Setelah selesai, kemudian menyaring benda uji dengan

saringan No.8 dan menimbang berat yang lolos dengan

ketelitian 0,1 gram.

g. Menghitung nilai AIV dengan rumus :

%100xA

BAIV =

Keterangan :

AIV = Aggregate impact value (%).

A = Berat awal sampel (gram).

B = Berat sampel lolos saringan No.8 (gram).

1.6.4.1.1.1.2. Data Pengujian

Tabel. 1.14 Data pengujian aggregate impact value (AIV)


Sampel I Sampel II

BA

Aggregate impact value = ( ) x 100 %

Berat sampel (A)

40,80

454,20 459,20

9,16%

Item Pengujian

Berat sampel setelah penekanan dan lewat saringan 2,36 mm (B)

Berat sampel setelah penekanan dan tertahan saringan 2,36 mm

8,16%

8,66%

Berat (gram)

500.00 500.00

45,80

Rata-rata AIV (%)

1.6.4.1.1.1.3. Analisa Data

A. Pengujian 1

a. Nilai AIV =%100x

A

B

= %100x

500,00

45,80

= 9,16 %

B. Pengujian 2

b. Nilai AIV = %100x

A

B

= %100x

500,00

80,40

= 8,16 %

C. Rata - rata

c. Nilai AIV rata-rata = 2

8,16%9,16%+

= 8,66 %

I -


1.6.4.1.1.1.4. Kesimpulan

Dari hasil pemeriksaan Aggregate impact value (AIV) agregat kasar

di Laboratorium Rekayasa Transportasi Jurusan Sipil Fakultas Teknik

Universitas Hasanuddin, diperoleh nilai Aggregate impact value (AIV)

rata-rata sebesar 8,66 %.

Spesifikasi mengisyaratkan nilai AIV < 10% baik untuk lapisan

permukaan, sedangkan nilai AIV > 35% tidak baik untuk lapisan

permukaan. Jadi, benda uji yang digunakan dalam pemeriksaan AIV baik

digunakan sebagai lapisan permukaan.


Documents

38719809 BAB 1 Agregat Kasar XII