摘要
为探讨锂渣作为胶凝材料替代水泥对自密实高性能混凝土的改性作用,用锂渣分别替代11%、13%、15%、17%和19%(质量分数)的水泥,制备了不同水胶比(0.25、0.3、0.35和0.4)的自密实高性能混凝土,研究了锂渣掺量及水胶比对混凝土力学和工作性能的影响。试验结果表明,当水胶比控制在0.3~0.4时,能配制出工作性能合格的自密实高性能混凝土,其力学性能随着锂渣掺量的增加而呈先增后减的非线性变化特征。综合分析水胶比与锂渣掺量对混凝土的工作与力学性能的影响发现,不同水胶比条件下存在锂渣最优掺量区间:0.3水胶比对应的锂渣最佳掺量范围为12.0%~16.2%,0.35水胶比下扩大至11.7%~18.8%,而0.4水胶比时最佳掺量范围为11.0%~18.5%。基于试验数据建立具有显著相关性的抗压-抗折强度关系式(R^(2)>0.94),为锂渣自密实高性能混凝土的强度设计提供了理论依据。
To investigate the modification effect of lithium slag as cementitious material instead of cement on self-compacting high-performance concrete,self-compacting high-performance concrete with different water-binder ratios(0.25,0.3,0.35,and 0.4)is prepared by replacing 11%,13%,15%,17%,and 19%(mass fraction)of cement with lithium slag.The effects of lithium slag content and water-binder ratio on the mechanical and working properties of concrete are studied.Test results show that when the water-binder ratio is controlled at 0.3-0.4,self-compacting high-performance concrete with qualified working performance can be prepared,and its mechanical properties first increase and then decrease with the increase of lithium slag content.Based on comprehensive analysis of the influence of water-binder ratio and lithium slag content on the working and mechanical properties of concrete,an optimal dosage range of lithium slag is found under different waterbinder ratios.For the 0.3 water-binder ratio,the optimal lithium slag dosage range is 12.0%-16.2%.For the 0.35 waterbinder ratio,this range expands to 11.7%-18.8%.For the 0.4 water-binder ratio,the optimal dosage range is 11.0%-18.5%.Additionally,a compressive-flexural strength relationship with significant correlation(R^(2)>0.94)is established using the experimental data,offering a theoretical basis for the strength design of lithium slag self-compacting high-performance concrete.
作者
王庆龙
赵猛
周泽英
苏有文
梁建
WANG Qinglong;ZHAO Meng;ZHOU Zeying;SU Youwen;LIANG Jian(Beijing Urban Construction Group Limited Liability Company,Beijing 100000,China;School of Civil Engineering and Architecture,Southwest University of Science and Technology,Mianyang 621000,Sichuan,China)
出处
《建筑施工》
2025年第9期1350-1353,1358,共5页
Building Construction
基金
国家自然科学基金面上项目(41971214)。
关键词
自密实高性能混凝土
锂渣掺量
水胶比
力学性能
self-compacting high-performance concrete
lithium slag content
water-binder ratio
mechanical properties
