关键词: 聚合物基复合材料;苯丙乳液基;填缝料;剪切性能;扫描电镜

Abstract: Styrene-acrylic emulsion based cement compound joint sealant (SCS) was prepared with different cement ratio.The shear mechanical properties of SCS were investigated by the HS-3001B shearing testing apparatus.The results indicate that the shear strength and shear modulus are sensitive to change of cement ratio and an increase in cement ratio can result in a significant growth in shear strength and shear modulus of SCS.Furthermore, the shear deformation property and shear toughness of SCS are improved with an increase in cement ratio.A transition in the shear failure model of SCS from cohesive failure to adhesive failure is caused by the increase of cement ratio, and in the meanwhile, the increasing of cement ratio can also result in the decreasing of its loading displacement.The analysis of micro-mechanism based on scanning electron microscope (SEM) images illustrate that internal structure of SCS can be improved by an appropriate increase of cement ratio and then the shear strength, shear deformation property and shear toughness are enhanced simultaneously.

Key words: polymer composite;styrene-acrylic emulsion based;joint sealant;shear property;scanning electron microscope(SEM)