富浆胶凝砂砾石配合比设计试验研究

针对工程现场对于富浆胶凝砂砾石的适宜配合比设计经验不足的问题,基于双级配双重强度标准的“钻石带理论”和胶凝材料强度设计准则,采用常态拌和、加浆拌和两种生产工艺,通过正交抗压强度试验以及极差法分析,研究了胶凝材料用量、水胶比等参数变化对富浆胶凝砂砾石强度的影响,且得到了常态拌和工艺最细级配、平均级配的最优设计配合比以及加浆拌和工艺配合比。结果表明：在28,90 d相同设计龄期下,常态拌和胶凝砂砾石强度平均值约为加浆拌和胶凝砂砾石强度平均值的160～178倍。

Mix proportion design of rich slurry cementing sandy gravel

At present, the suitable mix proportion design experience for rich slurry cementing sandy gravel is insufficient. Based on the diamond belt theory of double gradation and double strength and the design criterion of cementing material strength, the influence of the parameters change of cementing material dosage and water-cylinder ratio on the rich slurry cementing sandy gravel strength were studied by orthogonal compressive strength test and extreme difference analysis. The optimum mix proportion of fine gradation and average gradation rich slurry cementing sandy gravel under the normal mixing process and adding slurry mixing process were obtained. The results showed that the average strength of normal mixing cementing sand gravel at the same design age of 28 d、90d was larger than that of adding slurry cementing sand gravel, the former is about 1.60 to 1.78 times of the latter.