水泥基土石坝防渗注浆材料试验
Experiment of cement-based seepage grouting materials for earth-rock dam

摘要： 为解决水利工程中普遍使用的注浆材料流动性差、结石率低等问题,以水泥为基本材料,掺加粉煤灰及膨润土,将减水剂、膨胀剂作为外加剂,对不同配比的材料进行浆液流动性及结石体物理性能等试验分析,综合各试验结果得出适用的材料配比。试验结果表明:掺加膨润土可以增加浆液稳定性,提高结石率,但同时会降低浆液流动性;掺加适量粉煤灰可以增加浆液流动性,提高浆液可注性;随着膨润土和粉煤灰掺量增加,浆液结石体的强度会有明显下降;膨润土和粉煤灰的掺量应适宜。研究成果对水利工程注浆材料研发具有较大的指导意义。
Abstract: In order to solve the problem of poor fluidity and low stone rate of grouting materials commonly used in hydraulic engineering, the experiments were conducted to investigate the improvements on the reinforcement effect of the existing grouting materials as cement, through backfilling fly ash and bentonite in cement as the water reducing agent and expansive agent respectively. Laboratory tests concentrated on investigating the two concerned physical properties of the examined grouting materials—the slurry fluidity and concretion, under different mixture proportions of the backfilled materials. Based on the experimentally obtained results, appropriate material mixture proportions were given based on the optimum improvement on the reinforcement effects. The result showed that bentonite could increase the stone rate of grouting, improve the slurry stability and reduce the slurry fluidity. The addition of appropriate amount of fly ash could improve the slurry fluidity and increase the grouting efficiency. As the proportions of the fly ash and bentonite increased, the concretion strength reduced, so it was suggested to control the mixture proportions of the backfilled materials in order to achieve an optimum strengthening effect. The results provided references for the applications of grouting reinforcement in hydraulic engineering