ATB30沥青稳定碎石基层低温抗裂性研究

Research on Low Temperature Anti-cracking Performance of the ATB30 Asphalt Treated Base

为了确保沥青稳定碎石基层的低温抗裂性,对3种ATB30级配进行了冻融后低温(-15℃、-5℃、5℃、15℃)劈裂试验和低温(-15℃、-10℃、-5℃、0℃、5℃、10℃、15℃)弯曲试验,全面评价了ATB30的低温抗裂性。结果表明:采用韩国SK-70号A级沥青的ATB30脆化点温度在-5—0℃之间,其弯曲应变能与温度的关系曲线接近4次抛物线,可用于ATB30的弯曲应变能的预测和沥青路面低温抗裂设计;采用级配中值的ATB30的低温抗裂性最好。

To ensure low temperature anti-cracking performance of asphalt treated base, the low temperature anti-cracking performance of three kinds of aggregate graduation ATB30 were comprehensively evaluated by freeze and thaw low temperature （-15℃、-5℃、5℃、15℃ ） split test and low temperature （ -15℃、-10℃、-5℃、0℃、5℃、10℃、15℃） bend test. The results showed that brittle temperature of ATB30 with Korean SK-70 grade A asphalt was between - 5 ℃ and 0 ℃. The functional relationship between curvature strain energy of ATB30 and temperature was near biquadratic parabola, and it could be used to predict curvature strain energy of ATB30 and low temperature anti-cracking design of asphalt pavement. The low temperature anti-cracking performance of ATB30 with aggregate graduation limit average was the most excellent.