Summary of Quality Control Tests Required for Bridges

7/27/2019 Summary of Quality Control Tests Required for Bridges

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SUMMARY OF QUALITY CONTROL TESTS REQUIRED FOR BRIDGES

CONTRIBUTED by Sri P.SURESH

DEPUTY EXECUTIVE ENGINEER

(R&B) SUB DIVISION, UDAYAGIRI.

(A)MATERIALS:

S.No.Name of

materialType of Test Frequency Permissible limits

1 CEMENT a) Fineness of

Cement

One test for each

consignment

33 N/mm2

> 43 N/mm2

> 53 N/mm2

2 STEEL a) Weight perrunning

meter in Kg

One test for each

consignment

6mm-0.222Kg/m

8mm-0.395Kg/m

10mm-0.620Kg/m

12mm-0.888Kg/m

16mm-1.578Kg/m

20mm-2.465Kg/m

25mm-3.852Kg/m

32mm-6.311Kg/mb) Characteristic

yield stress fy

i) S-240(Mild)

ii) S-415 (HYSD)

iii) S-500 (TMT)

One test for each

consignment

> 240 N/mm2

> 415 N/mm2

> 500 N/mm2

c)Percentage

elongation

One test for each

consignment

Not Less than14.5%


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S.No.Name of

material

Type of Test Frequency Permissible limits

3 WATER a) PH Value One test for

each source

(or) monthly

>6

b) Sulphates One test for

each source

(or) monthly

< 400 mg/Litre

c) Chlorides One test for

each source(or) monthly

< 500 mg/Litre for RCC

< 2000 mg/Litre for PCC

4 COARSE

AGGREGATE

a) Sieve Analysis 1 Test/15m3 As per IS: 383 Table

b) AIV

i) Non-wearing

surfaces

ii) Wearing surfaces

One test for

each source

(or) as and when

required

(or) monthly

< 45%

< 30%

c) FIV

i) For Structures

ii) For CC

pavements

1 Test/30m3

< 35%

< 40% (IRC: 44)

d) Water absorption 1 Test/Day < 2%

5 FINE

AGGREGATE

a) Sieve analysis 1 Test/15 m3 As per IS 383

b) Fineness

Modulus

1 Test/15 m3 2 to 3.50

c) Silt Content 2 Tests/Day < 4%

d) Bulking of sand 2 Tests/Day Not required when concrete

is laid by weight


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B) CONCRETE:

S No.Name of

materialType of Test Frequency Permissible limits

1 CONCRETE a) Slump Test 2 Tests/Day

(or)

1 Test/10m3

15 to 45 mm

For CC pavement

25 to 50 mm

For structures

2 CONCRETE b) Compressive

Strength Test

Number of samples to be prepared and tested as

per IS: 456 (one sample means 3 specimen

cubes of 150x150x150mm)

Quantity of

Concrete

i)1-5 Cum

ii) 6-15 Cum

iii) 16-30 Cum

iv) 31-50 Cum

Number of Samples to be casted for

7 days + 28 days

1x3 + 1x3 = 6 No

2x3 + 2x3 = 12 No

3x3 + 3x3 = 18 No

4x3 + 4x3 = 24 No

3 CONCRETE c) CompressiveStrength Test

As given in (b)subject to a

minimum of 6

cubes

7 Days 70% of fck28 days fck+3.0

up to M15

28 days fck+4.0

above M15

As per Clause 16.1 & Table 11

of IS: 456-2000

7 Days Compressive Strength for Different Grades of Concrete

Grade of concrete Load Compressive Strength

M-10 Grade

M-15 Grade

M-20 Grade

M-25 Grade

M-30 Grade

M-35 Grade

M-40 Grade

>160 KN

>240 KN

> 315 KN

> 395 KN

> 510 KN

> 555 KN

> 630 KN

> 7.00 N/mm2

> 10.50 N/mm2

> 14.00 N/mm2

> 17.50 N/mm2

> 22.50 N/mm2

> 24.50 N/mm2

> 28.00 N/mm2


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S.No.

Name of

material

Type of Test Frequency Permissible limits

28 Days Compressive Strength for Different Grades of Concrete

Grade of concrete Load Compressive Strength

M-10 Grade

M-15 Grade

M-20 Grade

M-25 Grade

M-30 Grade

M-35 GradeM-40 Grade

> 295 KN

>405 KN

>540 KN

>655 KN

>765 KN

>880 KN>990 KN

> 13.00 N/mm2

> 18.00 N/mm2

> 24.00 N/mm2

> 29.00 N/mm2

> 34.00 N/mm2

> 39.00 N/mm2

> 44.00 N/mm2

NOTE: (i) For calculating of compressive strength of concrete, the

following values are generally considered.

(a) 10 N = 1.0 Kg (Exactly 9.80 N = 1.0Kg); (b) 10 KN = 1.0MT;

(ii) The least count of compression testing machine is generally 0.50 MT

or 5 KN and total capacity is 100 MT or 1000KN

4 CONCRETE d) Core Tests ofHardened Concrete

2 Cores for

every 150 m3As detailed below

Strength of 150mm diameter cores with depth of 200mm for CC pavement

(Direct load on core after applying corrections)

Grade of concrete Average value Individual Value

M-25 Grade

M-30 Grade

M-35 Grade

M-40 Grade

>380 KN

> 460 KN

> 535 KN

> 610 KN

>305 KN

>370 KN

> 425 KN

> 490 KN

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Summary of Quality Control Tests Required for Bridges