Traffic and Highway Engineering
5th Edition
ISBN: 9781305156241
Author: Garber, Nicholas J.
Publisher: Cengage Learning
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Chapter 18, Problem 11P
To determine
The optimum percentage of asphalt, if the asphaltic content is specified as 5 to 7 percent for hot-mix, hot-laid asphaltic concrete mixture.
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1) Solve these:
a) For hot-mix, hot-laid asphaltic concrete mixtures, if the asphaltic content is specified as 5 to 7 percent, how is the optimum percentage determined?
b) Discuss the factors to consider in producing a rapid-curing cutback asphaltic material
Why is it important to have optimum binder content in asphalt concrete?What would happen if a less-than-optimum binder content is used? Whatwould happen if more than the optimum value is used? What is the typicalrange of binder content in asphalt concrete?
Discuss five different desirable characteristics of aggregate used in asphalt concrete.
Chapter 18 Solutions
Traffic and Highway Engineering
Ch. 18 - Prob. 1PCh. 18 - Prob. 2PCh. 18 - Prob. 3PCh. 18 - Prob. 4PCh. 18 - Given the specifications for an asphaltic concrete...Ch. 18 - Given the particle size distributions of two...Ch. 18 - Given the particle size distributions of two...Ch. 18 - Given four different types of aggregates to be...Ch. 18 - Prob. 9PCh. 18 - Prob. 10P
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- Given the specifications for an asphaltic concrete mixture and the results of a sieve analysis, determine the proportion of different aggregates to obtain the required gradation. Coarse aggregates: 60% Fine aggregates: 35% Filler: 5%arrow_forwardGiven four different types of aggregates to be used to produce a blended aggregate for use in the manufacture of asphaltic concrete, determine the bulk specific gravity of the aggregate mix.arrow_forwardA compacted asphalt concrete specimen contains 5% asphalt binder (Sp. Gr. 1.023) by weight of total mix and aggregate with a specific gravity of 2.755. The bulk density of the specimen is 2.441 Mg/m3 Ignoring absorption, compute VTM, VMA, and VFA.arrow_forward
- Why is it important to have optimum binder content in Hot-Mix-Asphalt? What would happen if a less-than-optimum binder content is used? What would happen if more than the optimum value is used? What is the typical range of binder content in HMA?arrow_forwardChoose standard PG asphalt binder grade for the following condition: (show your calculation) The seven-day maximum pavement temperature has a mean of 45°C and standard deviation of 4°C The minimum pavement temperature has a mean of -26C and a standard deviation of 2.0°C. a) At reliability of 84% b) At reliability of 98%.arrow_forwardA compacted asphalt concrete specimen has the following propertiesAsphalt Content = 5% by total weight of the mixBulk specific gravity of the mix = 2.485Theoretical maximum specific gravity = 2.595Bulk specific gravity of the aggregate = 2.715Absorption = 1.5%Compute the percent's VTM, VMA, and VFAarrow_forward
- the asphalt binder with Rostler Parameter value equal to 1.3 has more performance than asphalt binder with Rostler Parameter value equal to 1.1: true falsearrow_forwardHow is the load supported by asphalt concrete in the cases of tension and compression? Under what conditions is the asphalt concrete layer subjected to tension?arrow_forwardWhat are the components of hot-mix asphalt? What is the function of each component in the mix?arrow_forward
- How do you simulate asphalt pavement aging during construction and for the first couple of years in Superpave mix design? Using RTFO Using DSR Using PAV Using BBRarrow_forwardA mix has an aggregate/cement ratio of 6 and a concrete porosity of 17 per cent. Assuming there is no entrapped air, calculate the water/ cement ratio of the mix, given that the specific gravity of aggregate is 2.6 and the degree of hydration is 90 per cent.arrow_forwardThe mix design for an asphalt concrete mixture requires 2 to 6% minus No.200. The three aggregates shown in Table are available.Considering that approximately equal amounts of coarse and intermediateaggregate will be used in the mix, what is the percentage of fine aggregate that will give a resulting minus No. 200 in the mixture in the middle of the range,about 4%?arrow_forward
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