聚灰比对聚合物快硬水泥砂浆耐久性的影响

Influence of Polymer Cement Ratio on Durability Properties of Polymer Modified Rapid Harding Cement Mortars

为研究聚灰比对聚合物快硬水泥砂浆的耐久性的影响,对比了不同聚灰比下快硬水泥砂浆的抗冻性和抗渗性,并通过压汞法测试不同聚灰比下砂浆的孔结构,进而研究聚灰比对水泥砂浆孔结构、孔隙率及孔径分布产生的影响,并探明孔结构对水泥砂浆的抗冻性和抗渗性能改善的作用机理。研究结果表明:聚合物砂浆的抗冻性能和抗氯离子渗透性能都随聚灰比的增加而提高,当聚灰比为0.05时,其综合性能最佳;随聚灰比的增加,聚合物快硬水泥砂浆微观结构得以改善,虽然总孔隙率有所增加,但其中值孔径减小。

In order to investigate the effect of polymer cement ratio on the durability of polymer modified rapid hardening cement mortar,the frost resistance and the penetration resistance of chloride ions of rapid hardening cement mortar with different polymer content were compared. The pore structure measured by mercury intrusion method was used to analyze the influence of polymer content on pore structure,porosity and pore size distribution inside cement mortar. The improving mechanism of polymer emulsion powder to frost-resistance and impermeability properties of rapid hardening cement mortar was revealed. The results showed that both the antifreeze performance and chloride-permeation resistance rise with the increase of the polymer content. When the polymer cement ratio is 0. 05,the comprehensive performance of cement mortar is the better. With the increase of the polymer content,the microstructure of polymer rapid harding cement mortar was improved,although the total porosity increases gradually,the median pore diameter decreases.