抗离析剂对混凝土耐久性影响研究

Research on effect of segregation resistance agent on durability of concrete

抗离析剂是解决混凝土离析和坍落度过大的一种调节剂,正在建筑行业内进行推广使用。本试验研究了抗离析剂对混凝土作用效果,以及力学性能和耐久性能的影响。结果表明,抗离析剂能够有效改善混凝土的离析程度,未观察到其对混凝土抗压强度有明显不利影响。与空白组试样对比,加入抗离析剂的混凝土早期抗裂性能、抗氯离子渗透性能出现了略微下降,但混凝土抗碳化性能相当,抗硫酸盐侵蚀性能有所提高。

Segregation resistance agent(SRA)which is a kind of regulator to solve concrete segregation and excessive slump is being popularized in construction industry.A study including effects of SRA,strength and durability of concrete was conducted.The experimental results revealed that the SRA improved effectively the degree of segregation of concrete,and had no obvious adverse effect on the strength of concrete.The inclusion of SRA in concrete resulted in a slight decrease in the early cracking resistance and resistance of concrete to chloride penetration,but an equivalent carbonation resistance of concrete.The resistance of concrete with SRA to sulfate attack was improved in comparison with that of the concrete without this admixture.