Air voids in asphalt mix should be not less than :a.5.0 %b.3.0 %c.6.0 %d.None
Question
Air voids in asphalt mix should be not less than :a.5.0 %b.3.0 %c.6.0 %d.None
Solution
The correct answer is a. 5.0 %. The air voids in an asphalt mix should not be less than 5.0%. This is because air voids are crucial for the durability and performance of the asphalt pavement. They allow for the expansion and contraction of the asphalt material due to temperature changes and traffic loads. If the air voids are less than 5.0%, it could lead to issues such as rutting, cracking, and premature pavement failure.
Similar Questions
The properties of asphalt mastic are crucial in determining the moisture sensitivity of asphalt mixtures, but the adhesion performance of the mastic has not been quantitatively described. To address this gap, this study calculated the asphalt mastic surface energy using the equation-of-state method, and established a moisture sensitivity (𝑀𝑆) index based on it. The effectiveness of this index was verified through Marshall testing. First, the surface energy of asphalt and filler was measured, and the critical volume fraction of the mastic was determined using the two-point method. Second, the interaction parameters of asphalt and filler were calculated using the equation-of-state method, and the surface energy of the mastic was obtained. Then the 𝑀𝑆 index was established to evaluate the moisture sensitivity of asphalt mixtures. This new index utilizes the surface energy and aggregate to quantitatively evaluate adhesion, considering the specific surface area of the aggregate and the thickness of asphalt film. Finally, the 𝑀𝑆 was validated through Marshall tests of asphalt mixtures. The results demonstrated that the 𝑀𝑆 obtained by the calculated surface energy exhibits a strong linear correlation with the moisture sensitivity of asphalt mixtures. The goodness of fit reached above 0.90 and the highest was 0.965. This study provided a novel approach to characterize the moisture sensitivity of asphalt mixtures.
It is very difficult to determine the volume of voids present in a sample of composite material and requires expensive equipment True False
From data in Table 1, graph the penetration (at 25 degreesC) on the original asphalt sample as a function of the flash point (x-axis) in each case. Briefly discuss the trend that emerges.
Build a relationship between dry unit density, percentage of air voids and moisture content. Define any constants involved.
For unsaturated air, the value of DPT is _________ WBTSelect one:a. equal tob. much more thanc. more thand. less than
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