片麻岩-SBS橡胶沥青黏附性及混合料路用性能研究

Research on Adhesion Characteristics of Gneiss-SBS Asphalt Rubber and Its Road Performance

为了研究酸性片麻岩集料与改性沥青的黏附特性及其沥青混合料的高温抗车辙和低温抗裂性能,制备掺加抗剥落剂的SBS改性沥青、SBS橡胶改性沥青、SBS塑化橡胶改性沥青,以及相应的沥青混合料。在测定改性沥青基本性能的基础上,利用接触角测量仪分别测试3种改性沥青与不同测试试剂的接触角,借助表面能理论计算表面能参数,并以车辙试验和低温弯曲试验评价3种沥青混合料的高低温性能。结果表明:3种改性沥青与蒸馏水的接触角最大,与乙二醇的接触角最小;掺加塑化胶粉改性沥青的表面能最大,掺加普通胶粉改性沥青的表面能次之,两者的表面能分别为SBS改性沥青的1.70倍、1.76倍;片麻岩-SBS橡胶沥青混合料的动稳定度为片麻岩-SBS塑化橡胶沥青混合料的1.32倍,而最大弯拉应变下降了4.28%,但两者的动稳定度和最大弯拉应变均大于SBS改性沥青混合料。

To study the adhesion characteristics of acid gneiss aggregate and modified asphalt,and the high temperature anti-rutting and low temperature anti-cracking performance of asphalt mixtures,SBS modified asphalt,SBS asphalt rubber and SBS plasticized rubber modified asphalt mixed with anti-stripping agent are prepared.Based on measuring the basic properties of three modified asphalts,the contact angles between the three modified asphalts and different test reagents are tested by a contact angle measuring instrument.Then the surface energy parameters are calculated using the surface energy theory.The high and low temperature performances of the three asphalt mixtures are evaluated by the rutting test and low temperature bending test.The results show that the three modified asphalts have the largest contact angles with distilled water and the smallest contact angles with ethylene glycol.The surface energy of the modified asphalt mixed with plasticized rubber is the largest,and the surface energy of the modified asphalt mixed with ordinary rubber follows.The surface energies of the two modified asphalts are 1.70 times and 1.76 times that of SBS modified asphalt.Finally,the dynamic stability of gneiss-SBS asphalt rubber mixture is 1.32 times that of gneiss-SBS plasticized rubber asphalt mixture,while the maximum flexural strain decreases by 4.28%,but the dynamic stability and maximum flexural strain of the two asphalt mixtures are greater than those of the SBS modified asphalt mixture.