破碎岩体快速注浆加固地聚合物注浆材料试验研究

Experimental Study on Geopolymer Grouting Material in Rapid Grouting Reinforcement of Fractured Rock

地聚合物材料本身具有快凝和早期强度高等优点。为进一步探究该材料早期(≤24 h)性能特点及其应用于破碎岩体快速注浆加固中的可能性,以改性水玻璃溶液为激发剂,以偏高岭土内掺矿渣为前驱体,通过正交试验对地聚合物注浆材料的流动度、初凝/终凝时间和析水率等工作性能以及早期(≤24 h)力学性能等指标进行研究。试验结果表明:相比传统纯水泥浆液,地聚合物注浆材料具有凝结时间快、流动度高、稳定性好以及结石体早期强度高的优点,可适用于部分快速注浆加固工况中;当矿渣替代率为45%,改性水玻璃激发剂模数和浓度分别为1.5和75%以及液固比为1.5时,地聚合物综合性能最佳;矿渣替代率和改性水玻璃激发剂浓度是对浆液影响相对较大的两个主要因素。

Geopolymer material itself has the advantages of fast setting and high early strength.In order to further explore the early(<24h)performance characteristics of the material and the possibility to apply it in the rapid grouting reinforcement of broken rock mass,the early(<24h)mechanical properties and the working performance indicators of geopolymer grouting material,such as fluidity,initial/final setting time and water evolution rate,were studied through the orthogonal test,taking the modified water glass solution as the activator,and the metakao-lin mixed with slag as the precursor.The test results show that,compared with the traditional pure cement slurry,the geopolymer grouting material has the advantages of fast setting time,high fluidity,good stability and early high strength of the stone.It can be applied to some rapid grouting and strengthening conditions.When the replacement rate of mineral powder is 45%,the modulus and concentration of the modified water glass activator are 1.5 and 75%respectively,and the liquid-solid ratio is 1.5,the comprehensive performance of geopolymer is the best.The replacement rate of mineral powder and the concentration of modified water glass activator are the two main factors that have relatively large influence on the slurry.