一种高弹沥青面层抗反射裂缝能力试验研究

采用室内疲劳试验、冲击韧性试验和模拟反射裂缝试验对高弹沥青、普通AH-70和AH-50沥青的面层混合料的抗反射裂缝扩展能力进行分析.结果表明,采用高弹沥青的沥青混合料的600微应变的疲劳寿命分别是AH-70和AH-50沥青混合料的88倍和55倍;模拟反射裂缝试验显示,高弹沥青混合料的初裂次数分别是AH-70沥青和AH-50沥青的1.2和2倍,终裂次数分别是AH-70沥青和AH-50沥青的1.9和1.4倍;高弹沥青混合料的冲击韧性分别是AH-50沥青和AH-70沥青的2.2倍和2倍.因此,高弹沥青可以明显提高沥青混合料的抗反射裂缝能力.

Ability of High Elasticity Asphalt Mixture in Resisting Semi-rigid Pavement Reflective Cracking

A series of tests,such as fatigue test,reflective cracking modeling test and impact ductility test,are jconducted to compare the ability of high elasticity asphalt,AH-70 asphalt and AH50 asphalt to resist reflective cracking.Tests results show that the fatigue life of high elasticity asphalt hot mix asphalt(HMA) is 88 times as long as that of AH-70 asphalt and 55 times al long as that of the AH-50 asphalt.The corresponding load cycle of initial cracking of high elasticity asphalt HMA is 2 times lager than AH-70 and AH-50 asphalt HMA.High elasticity asphalt HMA is about 2 times stronger than AH-70 and AH50 asphalt HMA in the impact ductility.As a result,high elasticity asphalt is more resistant than the other two materials to resist the reflective cracking.