IJEART

Cracking of asphalt pavement seriously affects its use function, and the temperature big change is a important factor of the asphalt pavement cracking. Although both domestic and international have carried out a lot of researches on asphalt pavement freeze-thaw damage, in the evaluation of performance index of asphalt mixture performance indicators, lots of researches didn’t consider the influence under the combined effects of freeze-thaw and water. What’s more, there is no experimental means and standards of evaluating asphalt mixture shear failure mode under the combined effects of freeze-thaw and water, so an experimental method is designed, starting pure shear tests for the asphalt mixture with different asphalt-aggregate ratio and particle size. Prepare asphalt Mixture of different asphalt-aggregate ratio and particle size. First, put specimens in a water bath at room temperature, and make specimens in the water to keep 48 hthen remove the specimen in a plastic bag, add about 10ml of water, and tie the bag, then place it in the constant temperature(-182℃) refrigerator about 16 hours., and finally place it in the constant temperature(600.5℃) bath about 24 hours. By single factor theory, starting pure shear tests for the asphalt mixture with different asphalt-aggregate ratio and particle size under the condition of the freeze-thaw and water combined. Through data analysis, obtained the evolution rule of the asphalt mixture’s shear strength and shear strain on different asphalt-aggregate ratio and particle size. Research indicates: Other conditions remain unchanged, the shear stress with asphalt mixture particle size increases, with the asphalt-aggregate ratio is increased and then decreased presentation. The results provide technical support and theoretical basis for asphalt road construction.