Evaluation of deicer solution applications on conventional ... · asphalt pavements. Nano clay is...

Evaluation of deicer solution applications

on conventional and nano-clay modified

asphalts Erol Iskender, Atakan Aksoy, Aytuna Sayin, Berna Erdol,

Kivanc Zorlu Kendir, Dundar Ayyildiz

28. – 29. listopadu 2017, České Budějovice

Motto: Asfaltové vozovky – bezpečná cesta k prosperitě

Evaluation of deicer solution

applications on conventional and nano-

clay modified asphalts

Erol Iskender, Atakan Aksoy, Aytuna Sayin, Berna Erdol,

Kivanc Zorlu Kendir, Dundar Ayyildiz

Introduction

In road safety, fighting with snow and ice has an important

place.

In cold climatic regions, various techniques are used to

combat icing problem.

The use of anti-icing and de-icer is one of the most commonly

used methods.

Generally, sodium chloride, potassium acetate, magnesium

chloride and sodium acetate are used.

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Scope

Various modifiers are used to improve the performance of

asphalt pavements.

Nano clay is innovative additive used in asphalt mixtures.

In this study,

Effects of de-icers on the asphalt mixture performance,

Effect of nanoclay modification on the cracking and stripping behavior

of the asphalt mixture was investigated.

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Materials and method (1)

Stone mastic asphalt mixture gradation (Turkish specification)

19mm maximum aggregate size

Basalt aggregate

50-70 pen. grade bitumen

Cellulose fibre

5

0

20

40

60

80

100

0,01 0,1 1 10 100

Pe

rce

nta

ge

Pa

ss

ing

, %

Sieve Size, mm

SMA 1-A upper limit for Turkey

Used SMA gradation

SMA 1-A lover limit for Turkey

Materials and method (2)

Nanoclay modification was applied

Control mixture (unmodified mixture)

2% nanoclay modified mixture

4% nanoclay modified mixture

Nanoclay was added to bitumen

according to bitumen weight.

High shear mixer

160˚C stirring temperature

20 minutes mixing time

4500rpm mixing speed

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Materials and methods (3)

AASHTO T283 conditioning system was applied

The briquettes were divided into 5 groups and different

options were used as the conditioning fluid.

The first group of samples was not conditioned.

The second group of samples was conditioned with pure water.

Third group: 25% sodium chloride (NaCl) solution

Fourth group: 50% magnesium chloride (MgCl2) solution

The fifth group: 50% potassium acetate (KAc) solution

Indirect tensile strength test was performed at 0˚C and 25˚C

test temperatures.

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Test results and evaluation

8

20

25

30

35

40

45

Unconditioned Waterconditioned

NaCIconditioned

MgCI2conditioned

KAcconditioned

Ind

irect

ten

sio

n s

tren

gth

(k

N)

Conditioning type

Control mixtures

2% nanoclay modification

4% nanoclay modification

Average indirect tensile strength values at 0°C test temperatures

Test results and evaluation (2)

9

Indirect tension strength ratios at 0°C test temperatures

0,0

0,2

0,4

0,6

0,8

1,0

1,2

Waterconditioned

NaCIconditioned

MgCI2conditioned

KAcconditioned

Ind

ire

ct

ten

sio

n s

tre

ng

th r

ati

o

Conditioning type

Control mixtures

2% nanoclay modification

4% nanoclay modification

Test results and evaluation (3)

10

Average indirect tensile strength values at 25°C test temperatures

0

2

4

6

8

10

12

Unconditioned Waterconditioned

NaCIconditioned

MgCI2conditioned

KAcconditioned

Ind

irect

ten

sio

n s

tren

gth

(kN

)

Conditioning type

Control mixtures

2% nanoclay modification

4% nanoclay modification

Test results and evaluation (4)

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Indirect tension strength ratios of mixtures at 25°C test temperatures

0,0

0,2

0,4

0,6

0,8

1,0

1,2

Waterconditioned

NaCIconditioned

MgCI2conditioned

KAcconditioned

Ind

irect

ten

sio

n s

tren

gth

rati

o

Conditioning type

Control mixtures

2% nanoclay modification

4% nanoclay modification

Test results and evaluation (5)

Ratio of percentage change in ITSR values

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0˚C temperature 25˚C temperature

Water

cond.

NaCI

cond.

MgCI2

cond.

KAc

cond.

Water

cond.

NaCI

cond.

MgCI2

cond.

KAc

cond.

Control

mixtures 0.0 -7.0 0.3 -1.2 0.0 -2.5 -10.8 -0.2

2% nanoclay

modification -6.1 5.8 -3.3 2.0 17.3 26.0 21.5 24.8

4% nanoclay

modification -1.6 3.1 5.6 7.0 25.1 17.6 30.8 21.0

Conclusions

When the de-icer materials are used in conventional control

mixtures moisture damage distress problem increases but a

low level of damage increasing is concerned.

Nano-clay modification decreased moisture damage levels. In

case of nano clay modification these materials decreases

damage levels originated from de-icer solutions.

Damage decreasing levels are thought independently from

nano clay ratios.

3% nanoclay modification can be pleaded as a logical ratio.

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Thank you for your attention…

aaksoy@ktu.edu.tr

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