桥面用丁苯乳液改性水泥砂浆的力学性能

摘要

用德国标准和规范研究了丁苯乳液D623对桥面用水泥砂浆力学性能的改性效果.丁苯乳液D623对砂浆有良好的减水作用，对提高抗折强度和粘结抗拉强度也有显著作用，并可大幅度降低压折比、提高折弹比.综合抗压强度、抗折强度、抗拉粘结强度和弹性模量等力学性能，桥面用改性砂浆的聚合物D623掺量范围为10.0％～17.5％.%This paper is special in modifying effects of styrene-butadiene emulsion D623 on mechanical properties of cement mortar used for the surface repair of bridge on the base of German standards and specifications. It has shown that the polymer emulsion D623 reduces content of mixing water, effectively enhances both flexural strength and tensile bond strength, largely decreases the ratio of compres sive strength to flexural strength, while improves the ratio of flexural strength to elastic modulus. In conclusion, taking the combination of mechanical properties of modified mortar, such as compressive strength, flexural strength, tensile bond strength and elastic modulus, the appropriate addition of polymer emulsion D623 to modified mortar for the use of bridge repair ranges from 10.0％ to 17.5％.