中文摘要：

采用丁苯乳液改性硫铝酸盐水泥砂浆,测试其力学性能、干燥收缩以及毛细孔吸水率,并对比了低温（0、5℃）、室温（20℃）和高温（40℃）养护对丁苯乳液/硫铝酸盐水泥砂浆性能的影响。结果表明：不同养护温度下,丁苯乳液对砂浆性能都有明显改善,随乳液掺量增加,抗压、抗折、粘结强度均先减小后增大,其中抗折强度和粘结强度提高显著,且压折比降低、韧性提高,毛细孔吸水率降低。养护温度升高,抗压、抗折、粘结强度均提高,但不同龄期不同乳液掺量时温度的影响程度不同。高温养护使对比砂浆在早期产生膨胀,但是无论何种养护温度均不会使改性砂浆发生膨胀。特定龄期下高温和低温养护都有利于改善砂浆的柔韧性。养护温度对对比砂浆和改性砂浆的收缩率影响不同。丁苯乳液不仅在室温下改善了硫铝酸盐水泥砂浆性能,而且显著增强了其耐低温和高温性能。

英文摘要：

Styrene-butadiene rubber （SBR） latex was used to modify sulphoaluminate cement （CSA） mortar and the mechanical properties, drying shrinkage and water absorption rate were investigated. The effect of curing temperature （i.e., low （0, 5 ℃）, room （20 ℃） and high （40 ℃）） temperatures on the properties of the SBR/CSA mortar was also analyzed. The results show that SBR latex improves the properties of the CSA mortar at different curing temperatures. The compressive, flexural and tensile bond strengths of mortar firstly decrease and then increase with the increase of SBR dosage. The flexural strength and tensile bond strength increase, the ratio of compressive strength to flexural strength decreases, the flexibility improves and the water absorption rate decreases in the case of appropriate addition of SBR. The compressive, flexural and tensile bond strengths increase with curing temperature, but the curing temperature has different effects at different ages and SBR dosages. At certain ages, high and low curing temperature both can favor the improvement of the flexibility. The curing temperature has different effects on the shrinkage rate of the control and modified morta. The control mortar expands in early age under high curing temperature, but the modified mortars don＇t expand under all curing temperatures. SBR latex can improve the performance of CSA mortar at room temperature and enhances its performance at low and high temperatures.