Effects of Different Admixtures on Workability and Tensile Properties at Maintained Extension of Styrene-Acrylic Emulsion-Based Cement Composites

Aiming at the joint diseases of airport cement concrete pavement, the effects of different admixtures and their dosages on the workability and tensile properties at a maintained extension of styrene-acrylic emulsion-based cement composites pavement joint were studied through leveling test, consistency test, mercury intrusion porosimetry and determination of tensile properties at maintained extension. The leveling property, consistency and elastic recovery rates were tested and the effect of modification was revealed from a microcosmic aspect in combination with mercury intrusion porosimetry. The results show that the consistency increases with the increase of film-forming additive and plasticizer, while decreases with the increase of silane coupling agent, and the leveling property all remains good. The excessive addition of silane coupling agent and plasticizer will lead to the deterioration of tensile properties at a maintained extension of the joint filler. The reasonable content of film-forming additives, plasticizers and silane coupling agents was obtained through experiments.