改性橡胶水泥砂浆强度的试验研究

分别采用水洗、NaOH溶液、KH570溶液和自制Na2SiO3溶液等方式对橡胶颗粒进行改性,并通过试验分别研究了不同改性方式对橡胶砂浆强度的影响作用。结果显示,10%NaOH溶液的改性效果最优,抗压强度和劈拉强度较基准橡胶砂浆分别提高了16.89%和46.56%。1 000倍的电镜观测表明,经NaOH溶液改性后橡胶颗粒表面的洁净度增加,空隙增多,与水泥石的咬合度增强,从微观上阐明了改性橡胶砂浆强度提高的机理。

Experimental Study on the Strength of Cement Mortar with Modified Rubber

The rubber was modified with several approaches, including washing, NaOH solution, KH570 solution, and homemade Na2SiO3 solution, and the experiments were conducted to investigate the impacts of different modification approaches on the strength of rubberized mortar. The test results showed that 10% NaOH solution has the best modification effects with 16.89% and 46.56% of increasing in the compressive strength and splitting tensile strength, respectively compared to the benchmark rubberized mortar. . The observation results using the electron microscope with a magnification of 1000 showed that after the modification with NaOH solution, the cleanliness and pores of the rubber surface increase, and the occlusion degree with cement reinforces, which explained the increasing strength mechanism of the cement mortar with modified rubber from the microscopic scale.