
The initial trial asphalt content for different blends.

Answer to Problem 16P
Explanation of Solution
Given information:
Nominal maximum sieve of each aggregate blend = 19 mm.
Calculation:
For trial blend 1, we have:
The amount of asphalt binder absorbed by the aggregates is estimated
from Eq. 18.18 as
Where,
Substitute the values in the required equation, we have
Estimate the percent of effective asphalt binder by volume using theempirical expression given as follows:
Where,
gradation (mm).
Substitute the values in the required equation, we have
Now, calculate the mass of aggregate by using the following formula:
Where,
Substitute the values, we have
A trial percentage of asphalt binder then is determined for each trial
aggregate blend using the following equation.
Where,
Substitute the values, we have
For trial blend 2, we have:
The amount of asphalt binder absorbed by the aggregates is estimated
from Eq. 18.18 as
Where,
Substitute the values in the required equation, we have
Estimate the percent of effective asphalt binder by volume using the empirical expression given as follows:
Where,
gradation (mm).
Substitute the values in the required equation, we have
Now, calculate the mass of aggregate by using the following formula:
Where,
Substitute the values, we have
A trial percentage of asphalt binder then is determined for each trial
aggregate blend using the following equation.
Where,
Substitute the values, we have
For trial blend 3, we have:
The amount of asphalt binder absorbed by the aggregates is estimated
from Eq. 18.18 as
Where,
Substitute the values in the required equation, we have
Estimate the percent of effective asphalt binder by volume using the empirical expression given as follows:
Where,
gradation (mm).
Substitute the values in the required equation, we have
Now, calculate the mass of aggregate by using the following formula:
Where,
Substitute the values, we have
A trial percentage of asphalt binder then is determined for each trial
aggregate blend using the following equation.
Where,
Substitute the values, we have
Conclusion:
Therefore, the initial trial asphalt content for1st, 2nd and 3rd blends is as follows
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Chapter 18 Solutions
Traffic And Highway Engineering
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