聚丙烯纤维与聚羧酸减水剂对水泥净浆流动性协

关键字：聚丙烯,纤维,与,聚,羧酸,减,水剂,对,水泥,

（海南大学　材料与化工学院，海南省精细化工工程技术研究中心，海南 海口 　570228）

      摘要：研究聚丙烯（PP）纤维单掺、PP纤维与聚羧酸减水剂（PCE）双掺对水泥净浆流动度及流动度保持性的影响；以及PCE在PP纤维和水泥颗粒表面的独立吸附量和竞争吸附量，探讨PP纤维与PCE对水泥浆体流动性能的协同作用机理。结果表明：PCE在PP纤维和水泥颗粒表面存在竞争吸附，PCE在PP纤维或水泥颗粒表面的独立吸附量均大于竞争吸附量；随着纤维掺量的增加，水泥净浆流动度显著降低，这是由于PCE无法提供足够的吸附量，在PP纤维或水泥表面的吸附量均减小；随着PP纤维长度的增加，其易缠绕成网状结构，导致净浆流动度减小，而由于纤维与水泥之间接触更紧密，PCE在纤维和水泥颗粒表面的吸附量增加，一定程度上抑制了纤维缠绕对净浆流动度的不利影响。

　关键词：聚丙烯（ＰＰ）纤维；聚羧酸减水剂；净浆；流动性；吸附量

    中图分类号：TU528.042.2  文献标识码：A   文章编号：1001-702X（2017）01-0089-05

 

Synergistic action of polypropylene fiber and polycarboxylate superplasticizer on flowability of cement paste

ZHANG Kun，PAN Lisha，LIN Chang，XU Nai

（Institute of Materials and Chemical Engineering，Hainan Provincial Fine Chemical Engineering Research Center，Hainan University，Haikou 570228，China）

    Abstract：The effect of Polypropylene（PP） fiber or PP fiber with polycarboxylate superplasticizer（PCE） on the dispersity and fluidity retention of cement paste，as well as the independent adsorption amount and competitive adsorption amount of PCE on the surface of PP fiber and cement particles were studied，and the synergistic action of polypropylene fiber and polycarboxylate superplasticizer on flowability of cement paste was discussed. The results indicated that the competitive adsorption of PCE occurred on the surface of PP fiber and cement particles，moreover the independent adsorption amount of PCE on the surface of PP fiber or cement particles is greater than competitive adsorption amount. With the increase of fiber content，the fluidity of cement paste was decreased gradually，because the PCE could not provide enough adsorption amount，and the adsorption amount of PCE decreased on the surface of PP fiber and cement particles. With the increase of PP fiber length，the mesh structure easily twined leaded to the decrease of cement paste fluidity，due to the closer contact between fiber and cement，the adsorption amount of PCE increased on the surface of PP fiber and cement particles，and inhibited the adverse impact of cement paste flowability of mesh structure.

    Key words：polypropylene fiber，polycarboxylate superplasticizer，cement paste，flowability，adsorption amount