为提高热活化锂渣复合水泥基凝胶材料工程性能,实现锂渣高效资源化利用,基于室内单因素试验,采用响应面法分析了热活化锂渣掺量、水玻璃掺量、水固比、水玻璃模数和水玻璃波美度对流动度、凝胶时间、析水率及3 d、28 d抗压强度的影响,确定最优配比,并验证该配比下材料的工程效果.结果表明,在热活化锂渣掺量7.32%、水玻璃掺量8.81%、水固质量比0.6∶1、减水剂0.4%的条件下,制备的热活化锂渣复合水泥基凝胶材料流动度为235.69 mm,凝胶时间为73.54 s,析水率为1.123%,3 d、28 d 抗压强度分别为11.54 MPa、22.9 MPa.与传统水泥基凝胶材料性能相比,其工程性能和抗硫酸盐侵蚀性均表现更优.
Optimization of Proportioning of Heat-Activated Lithium Slag Composite Cement-Based Cementitious Materials
To improve engineering performance of heat-activated lithium slag composite cementitious materials and realize efficient resource utilization of lithium slag.Based on the indoor one-factor test,response surface method was used to analyze the effects of heat-activated lithium slag content,sodium silicate content,water-solid ratio,sodium silicate modulus and baume degrees of sodium silicate on the fluidity,gelation time,water precipitation rate and 3 d,28 d compressive strength,to determine the optimal ratio,and validate the engineering effect of the material.The results show that when the content of hot activated lithium slag is 7.32%,the content of sodium silicate is 8.81%,the water-solid mass ratio is 0.6∶1,and the water reducing agent is 0.4%,the prepared heat-activated lithium slag composite cement-based cementitious materials of the mobility is 235.69 mm,the gel time is 73.54 s,and the water eluting rate is 1.123%,3 d,28 d compressive strength are 11.54 MPa,22.9 MPa,respectively.Compared with the performance of traditional cement-based cementitious materials,its engineering performance and sulfate erosion resistance were better.
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