Performance properties of polymer modified cement grouts for repair and rehabilitation of concrete pavement

摘要

This study was conducted to evaluate the groutability and interfacial bond strength of polymer modified cement grouts (PMCG) for repair and rehabilitation of concrete pavement with different polymer/cement ratio. The groutability of grouts was studied through the cone-shaped gap test and the grouted minimum gap width was determined. The interfacial bond strength, such as flexural and shear bond strength were measured. The experimental results indicate that the groutability of grouts modified by vinyl acetate/ethylene copolymer (EVA) improves obviously and the grouted minimum gap width decreases. The flexural and shear bond strength increase 32.41% and 122.92% when the polymer/cement ratio is 10%, at the ages of 28 days respectively. The microstructure of repair interface was observed and analyzed by using scanning electron microscope, and the modification mechanism of EVA latex was discussed.