EFFECT OF BINDER CONTENT ON THE VOLUMETRIC

PROPERTIES OF ASPHALT MIX

Presented by:

Muhammad Aleem

Civil Engineering Department

University of South Asia

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Topics discussed under are as:

Asphalt binder

Research objective

Causes

Test performed

Conclusion

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Binder?

A binder is any material or substance that holds or draws other materials together to form a cohesive whole

mechanically, chemically, or as an adhesive.

The binder content of an Hot Mix Asphalt (HMA) is one

of the critical factors affecting the quality of the mix.

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RESEARCH OBJECTIVE

To check the sensitivity of volumetric properties and performance of asphalt mixes

against varied binder content.

To check the effect of change of volumetric properties on the performance of hot mix

asphalt (HMA) pavements due to change in binder content.

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Causes

More than optimum Amount

Bleeding of pavement(result of over asphalting)

Early Deformation

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Contd…

Less than Optimum amount

Inadequate coating of aggregate particles

Loss of bond

Potholes

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Addition of binder Content

3.5%

4%

4.5%

5%

5.5%

With different compaction efforts of 25, 35, 50 and 75 blows.

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Test Performed

MARSHALL STABILITY AND FLOW TEST

MAXIMUM SPECIFIC GRAVITY

BULK SPECIFIC GRAVITY

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Binder Content ~ Stability

2000

3000

4000

5000

6000

7000

8000

9000

10000

11000

3 3.5 4 4.5 5 5.5 6

ST

AB

ILIT

Y (

N)

BINDER CONTENT(%AGE)

25 blows

35 blows

50 blows

75 blows

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Binder Content ~ VFA

0

20

40

60

80

100

120

3 3.5 4 4.5 5 5.5 6

VF

A

BINDER CONTENT (%AGE)

25 BLOWS

35 BLOWS

50 BLOWS

75 BLOWS

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Binder Content ~ Flow

0

5

10

15

20

25

30

3 3.5 4 4.5 5 5.5 6

FL

OW

(m

m)

BINDER CONTENT(%AGE)

25 blows

35 blows

50 blows

75 blows

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Binder Content ~ VMA

10

11

12

13

14

15

16

17

18

19

20

2 2.5 3 3.5 4 4.5 5 5.5 6

VM

A

BINDER CONTENT (%AGE)

25 BLOWS 50 BLOWS

35 BLOWS 75 BLOWS

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CONCLUSION

From investigational analysis it can be concluded that volumetric propertied of HMA mix are

very sensitive to change in binder content and stability is maximum at optimum binder

content.

The resistance to deformation of bituminous pavement under traffic load is reduced by the

addition of excessive binder content.

The ability to absorb binder of the aggregate used in the HMA is critical in determining

optimum binder content.

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