分散剂对蒸汽养护玻璃纤维混凝土抗渗性能的影响

Effects of Dispersants on Impermeability of Glass Fiber Concrete under Steam Curing

玻璃纤维在混凝土中的分散程度影响玻璃纤维混凝土的力学性能和抗渗性能,本文研究了高分子型超分散剂(B193)、聚醚改性聚合物(S-3101B)和羧甲基纤维素钠(CMC)对玻璃纤维混凝土微观结构、表面状况、抗压强度、劈裂抗拉强度和抗渗性能的影响。结果表明:三种分散剂能改善玻璃纤维混凝土中玻璃纤维的分散性,但是掺入分散剂S-3101B后会使混凝土产生大量孔隙,降低玻璃纤维混凝土的力学性能和抗渗性能;当分散剂B193掺量为0.5%(相对于胶凝材料的质量分数,下同)时,玻璃纤维混凝土试件的抗渗性能最好,渗水高度降低16.6%,当分散剂CMC掺量为0.5%时,渗水高度降低7.1%。最后建立了掺加三种分散剂的玻璃纤维混凝土渗水高度和分散剂掺量之间的关系曲线,可供工程设计参考。

The dispersion degree of glass fiber in concrete is related to the mechanical properties and impermeability of glass fiber concrete. In this paper, the effects of polymer type hyperdispersant(B193), polyether modified polymer(S-3101 B) and sodium carboxymethyl cellulose(CMC) on the microstructure, surface condition, compressive strength, splitting tensile strength and impermeability of glass fiber concrete were investigated. The results show that the three dispersants improve the dispersivity of glass fiber in glass fiber concrete, but the dispersant S-3101 B mixed into the concrete causes many pores in the concrete, which reduces the mechanical properties and impermeability of glass fiber concrete. When the dispersant B193 dosage is 0.5%(mass fraction relative to the gel material, the same below), the best impermeability of glass fiber concrete specimens is achieved, and the seepage height is reduced by 16.6%. When the dosage of dispersant CMC is 0.5%, the seepage height is reduced by 7.1%. The relationship curves between seepage height and dispersant dosage of glass fiber concrete mixed with three dispersants are established for engineering design reference.