聚合物改性混凝土抗冻耐久性试验研究

Experimental study on polymer modified concrete frost durability

为研究聚合物掺量对混凝土抗冻性能的影响,选择后掺法制作了聚灰比分别为0、5%、10%、15%、20%的五组试件,采用快冻法冻至不同循环次数后观察外观损伤变化,测其质量、动弹性模量及抗折强度变化,并计算耐久性系数。以动弹性模量为损伤变量,分析了冻融损伤、聚合物掺量与抗折强度之间的关系,通过分析建立了聚合物改性混凝土冻融后抗折强度衰减方程。经过试验得到,当聚合物掺量为15%-20%时对混凝土的抗冻性能改善效果最好。

In order to study polymer additive on concrete frost resistance and selection doping rule of law were made by polymer - cement ratio 0,5%, 10%, 15% ,20% of the five groups of specimens, using changes in the appearance of damage observed after fast freez- ing method to different cycles, measuring their quality, dynamic elastic modulus and flexural strength of the change, and calculate durability factor. In dynamic elastic modulus of damage variable analyzed freezing thawing damage, the relationship between the polymer content and flexural strength, and by analyzing the established polymer - modified flexural strength after freezing thawing decay equation.Test conclusion when the polymer content of 15% to 20%of the frost resistance of concrete to improve the best.