摘要
为了改善传统半柔性路面材料的低温抗裂性能,采用水泥-乳化沥青-水性环氧树脂三相有机无机复合材料作为新型胶结体系制备的半柔性路面材料.采用匀质性及回弹模量检测方法确定胶结材料中的乳化沥青与水泥的质量比,调整水性环氧树脂与乳化沥青的质量比研究其低温抗裂性能.结果表明:当水性环氧树脂占乳化沥青的质量比为0.6时,半柔性路面材料的弯拉劲度模量达到2 332 MPa,最大弯拉应变达到2 662με,接近沥青玛蹄脂混合料的水平.扫描电镜研究表明:三相有机无机胶结体系形成以沥青材料为连续相、水性环氧树脂为改性分散相、水泥水化产物为衔接体的三维空间网络结构,既改善了水泥浆材料的干缩应力,同时增强了胶浆与基体沥青混合料的界面粘结力.
To improve the low temperature crack resistance of traditional pavement, semi-flexible pavement was prepared by using cement-emulsified asphalt-waterborne epoxy resin three-phase organic inorganic composite materials as grouting material. The mass ratio of emulsified asphalt and cement in grouting materials was determined by the method of homogeneous and resilient modulus testing. Results showed that when the mass ratio of waterborne epoxy and emulsified asphalt was 0.6, the maximum bending strain and bending stiffness modulus reached 2 662 με and 2 332 MPa, respectively, which was close to those of the stone matrix asphalt. SEM analysis illustrated that in the three-phase organic inorganic grouting system, three-dimensional network structure was formed, in which asphalt, waterborne epoxy resin and cement hydrates worked as continuous phase, dispersed phase and connector, respectively. This structure not only improved the cement material shrinkage stress but also enhanced the bonding force between mortar and matrix asphalt mixture.
出处
《武汉工程大学学报》
CAS
2015年第10期23-27,共5页
Journal of Wuhan Institute of Technology
基金
深圳市科学技术创新委员会科技项目(CXZZ20140820151319424)
关键词
三相胶结体系
干缩应力
交织网络
three-phase grouting system
dry shrinkage stress
weaving network
