摘要
为了优化软弱土地层注浆材料性能,本文设置13组浆液基准配合比,根据试验结果和工程经验确定浆液的基准配合比;通过研究外加剂对浆液即时、延时性能的影响规律,得出浆液配合比,并得到浆液延迟注浆优化方案。结果表明:减水剂和缓凝剂均能延缓浆液的即时凝结速度以及流动度损失速度,其中缓凝剂增大浆液初凝时间的效果更为显著,随延迟时间增长,浆液的流动度和初凝时间持续下降,终凝时间增长。为合理控制浆液的流动性和凝结时间,建议浆液的减水剂掺量尽量在水泥掺量的4.2%以下,缓凝剂掺量在0.08%~0.10%区间内。同时在延迟注浆不超过4 h的情况下,可以通过再次掺加减水剂的方法恢复浆液性能。
In order to optimize the performance of grouting materials in soft soil layer, 13 groups of benchmark mix proportion of slurry were set in this paper. And the benchmark mix proportion of slurry is determined according to the experimental results and engineering experience. By studying the influence laws of admixtures on the immediate and delayed properties of slurry, the slurry mix proportion and the optimal scheme of delayed grouting of slurry are obtained.The results show that both water reducing agent and retarder can delay the immediate setting speed and fluidity loss speed of slurry. And the effect of retarder on increasing the initial setting time of slurry is more significant. With the increase of delay time, the fluidity and initial setting time of slurry continued to decline, and the final setting time increased. In order to reasonably control the fluidity and setting time of the slurry, it is suggested that the dosage of water reducing agent of the slurry should be less than 4.2% of the cement dosage and the dosage of coagulant should be within the range of 0.08%-0.10%. At the same time, if the delayed grouting does not exceed 4 hours, the performance of the slurry can be restored by adding water reducing agent again.
作者
吴熙
任梦博
刘映晶
魏新江
丁玉琴
WU Xi;REN Meng-bo;LIU Ying-jing;WEI Xin-jiang;DING Yu-qin(Department of Civil Engineering,Zhcyiang University City College,Hangzhou 310015,Zhejiang,China;Zhejiang Engineering Research Center of Intelligent Urban Ins&asturcture,Hangzhou 310015,Zhejiang,China;Zhongtian Construction Group Co.,Ltd.,Hangzhou 310009,Zhejiang,China)
出处
《地基处理》
2022年第4期295-302,共8页
Journal of Ground Improvement
基金
浙江省自然科学基金探索项目(LY20E080006)。
关键词
注浆材料
配比优化
即时性能
延时性能
外加剂
软弱土层
grouting material
ratio optimization
immediate performance
delayed performance
admixture
soft soil
