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通过室内对水泥—粉煤灰浆液的各项物理力学及化学性质进行测试,获取了不同材料配比及不同龄期条件下浆液的结石体抗压及抗剪强度、流动度(扩散半径)、黏度、结实率、凝结时间等工程参数,探究了各工程参数间的相互作用关系。结果表明:不同龄期条件下的浆液硬化体抗压及抗剪强度随水灰比的增大而降低,对于注浆工程本身来说,选取7 d龄期条件下的浆液硬化体强度最为适宜;水灰比为1:0.5~1:0.8时,浆液流动性比较好,但硬化体强度较低,加固效果较差;而水灰质量比为1:1时,硬化体强度及结实率较高,充填加固效果较好;水泥—粉煤灰浆液的凝结时间随粉煤灰掺入量的增大而增大,随水灰比的增加而延长;水泥—粉煤灰浆液的流动度随着粉煤灰掺量的加大而降低,但黏度增大,结石率升高;当粉煤灰含量为20%时,水泥和粉煤灰的物理化学反应较好,可注性能优异,能够满足注浆堵水以及工作面底板改造的要求。
The physical and mechanical properties of the cement-fly ash slurry were tested indoors to obtain the compressive strength and shear strength, fluidity (diffusion radius), and compressive strength of the stones under different material ratios and different age conditions. Viscosity, seed setting rate, setting time and other engineering parameters to explore the interaction between the various engineering parameters. The results show that the compressive strength and the shear strength of the hardened body at different ages decrease with the increase of the water-cement ratio. For the grouting project itself, the hardening strength of the hardened body under the condition of 7 d is the most suitable ; When the ratio of water to cement is 1: 0.5-1: 0.8, the fluidity of slurry is better, but the strength of hardened body is lower and the reinforcing effect is worse. When the mass ratio of water to cement is 1: 1, High, filling and reinforcement effect is better; the setting time of cement-fly ash slurry increases with the increase of fly ash content, and increases with the increase of water-cement ratio; the fluidity of cement-fly ash slurry The content of fly ash increases and decreases, but the viscosity increases, the rate of stone increases; when the content of fly ash is 20%, the physicochemical reaction of cement and fly ash is good, the injection performance is excellent, can Grouting to meet the water and face reconstruction requirements.