Abstract
Calcium sulfoaluminate (CSA) cement is helpful to solve the problems of road and bridge maintenance as the cementitious material in rapid repair mortar. However, this repair mortar still has some disadvantages as low flexural strength and poor toughness during application. The effects of styrene acrylate ester (SAE) and styrene–butadiene rubber (SBR) latexes on rheological properties of CSA paste and mechanical properties of repair mortar were investigated, especially the toughness. Both SBR and SAE can reduce the fluidity loss rate and prolong the setting time, increase the flexural strength and bending toughness but decrease the compressive strength. The flexural strength and bending toughness reached the highest when the content of SBR was 8%, or when the content of SAE was12%. The effect of SAE on the toughness of repair mortar was more obvious. Continuous polymer film formed with the addition of SAE and SBR polymers. This film was conducive to the improvement of internal defects in the mortar and enabled uniform transfer of stress in the specimen, effectively suppressing the development of cracks. In addition, the polymer film formed by SAE was loose. Thus, the film had a slight effect on the distribution of the original hydration products in CSA cement. However, the continuous and dense polymer film formed by SBR had a certain effect on the continuous distribution of cement hydration products.
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