Ca(OH)_2溶液对水工混凝土增强剂的效果研究

Study on the effect of Ca(OH)_2 solution on hydraulic concrete reinforcing agent

水工混凝土所处环境特殊,对混凝土的抗渗性能要求较高.针对目前增强剂对混凝土强度提高能力有限的问题,研究增强剂在不同喷涂时间以及不同氢氧化钙浓度对混凝土防护效果的影响,选取了试件成型后1 d、7 d和28 d进行增强剂喷涂,并采用0.166%、0.083%、0.04%的氢氧化钙溶液及清水对水工混凝土进行预湿,从而确定出最佳的喷涂时间以及饱和混凝土面预湿的方式.从结果可以看出,喷涂效果随氢氧化钙溶液浓度的降低而提高,随喷涂龄期的延长而减小,当饱和方式为0.04%的氢氧化钙溶液并在1 d后喷涂增强剂可以使得增强剂达到最佳的防护效果.

The environment of hydraulic concrete is special,and the impervious performance of concrete is higher. Aiming at the limited ability of reinforcing agent to improve the strength of concrete. Research the influence of different spraying time and different concentration of calcium hydroxide on the protective effect of concrete,the specimen of 1 d,7 d and 28 d were enhanced by using reinforcing agent,0. 166%,0. 083%,0. 04% calcium hydroxide solution and water to pre wet the hydraulic concrete,so as to determine the optimum spraying time and saturated concrete surface. It can be seen from the results that the effect of spraying increases with the decrease of concentration of calcium hydroxide solution,and decreases with the prolongation of spraying age. When the saturated solution is 0. 04% calcium hydroxide solution and after 1 d,spraying enhancer can make the reinforcing agent achieve the best protective effect.