Comparative Study of Tensile Strength Ratio of Asphalt Concrete Mixed with AC 60-70 and Polymer Modified Asphalt
Keywords:limestone, AC 60-70, PMA, indirect tensile strength, tensile strength ratio
In Thailand, the temperature can reach 44.6 ºC with the lowest temperature of -1.4 ºC recorded in northeastern Thailand. When the air temperature changes, the state temperature of asphalt concrete also changes. To ensure a longer usage life of the surface of asphalt concrete and better durability of the asphalt concrete surface in the range of Thai environmental conditions, this research used the tensile strength ratio method to compare the damage caused by moisture. Samples (5 % and 7 % air voids of the volume of the asphalt concrete) were compared for a control group and a conditioned group, which simulated field behavior occurring in Thailand. It was discovered that the resistance to damage caused by moisture depended on the size of the mixed aggregate material and the amount of asphalt cement present in the mixture. The sample containing mixed sizes according to the lower limit had a higher tensile strength than the mixed sizes according to the upper limit and the air voids of asphalt concrete were inversely proportional to its resistance to moisture damage. As the air void volume increased, the tensile strength ratio decreased.
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