摘要
通过3种试验方法对Superpave13和Superpave19级配下沥青混凝土的低温抗裂性能进行了研究。结果表明:添加纤维和SBS改性沥青使得沥青混合料出现破坏应变能、破坏应力、应变增长、劲度模量减小的趋势,可以明显提高沥青混合料的低温抗开裂能力,并且各型沥青混合料的劈裂破坏强度在不同的温度范围变化趋势不同,存在一临界温度(-10℃左右)使其出现峰值。3种混合料破坏荷载的大小顺序为:改性沥青>纤维混合料>普通沥青混合料,破坏应变也有同样的规律。由积分应变能试验获得的断裂韧度可以作为评价沥青混合料低温抗裂能力的有效指标。
Three kinds of laboratory experiments are conducted to study the anti-cracking performance of asphalt concrete with gradation of Superpave13 and Superpave19 under low temperature.The results show that： adding fiber and SBS modified asphalt can generate the mixtures＇ failure strain and failure stress,increase the strain and reduce the stiffness modulus,thus adding fiber and SBS modified asphalt can significantly improve the anti-cracking ability at low temperature;the cleavage fracture strength of different asphalt mixtures at different temperature range shows different trends,meanwhile,a critical temperature（about-10℃） exists,which can correspondingly generate a peak strength;the order of failure loads of three kinds of mixtures are： modified asphalt fiber mixture ordinary asphalt mixture,and failure strains have the same rules;in a sense,the anti-cracking ability of fiber asphalt may be better than that of SBS modified asphalt.Fracture toughness obtained by J-integral strain energy test can be used as effective evaluation index of anti-cracking performance of asphalt mixtures under low temperature.
出处
《重庆交通大学学报（自然科学版）》
CAS
北大核心
2010年第5期722-726,795,共6页
Journal of Chongqing Jiaotong University(Natural Science)
基金
湖北省重点科技项目(054307)
关键词
聚酯纤维
改性沥青混凝土
低温抗裂性能
J-积分应变能试验
polyester fiber
modified asphalt concrete
low temperature anti-cracking performance
J-integral strain energy test
