沥青马蹄脂碎石混合料抗裂性能研究

The Crack Resistance of Stone Mastic Asphalt Mixture

以间接拉伸试验为评价方法,研究纤维、沥青以及冻融循环次数对沥青混合料抗裂性的影响。试验结果表明:掺加聚丙烯腈纤维的沥青混合料的抗裂性能优于掺加玄武岩纤维和木质素纤维的沥青混合料;采用橡胶沥青的沥青混合料的抗裂性能优于采用SBS改性沥青和基质沥青的沥青混合料;不论冻融循环次数多少,破坏荷载和破坏应变随沥青类型的变化规律大致表现为:橡胶沥青>SBS改性沥青>基质沥青。

Indirect tensile test were used to evaluated the influences of asphalt mixture cracking resistance by fiber, asphalt and freeze-thaw cycles. The results can be reached. Firstly,the crack resist- ante of asphalt mixture with polyacrylonitrile fiber was better than mixture with basalt fiber or lignin fiber. Secondly, the crack resistance of asphalt mixture with rubber asphalt was better than mixture with SBS modified asphalt or common asphalt. And the failure load and failure strain variation roughly with the asphalt type was as follows ：rubber asphalt 〉 SBS modified asphalt 〉 common asphalt, regardless of how many freeze-thaw cycles