激发剂对锂渣-矿粉-水泥复合体系性能的影响  

Influence of Activators on Performance of Cement-Lithium Slag-Granulated Blast Furnace Slag Binder

作　　者：张国强 何燕 郜志海[1] Zhang Guoqiang;He Yan;Gao Zhihai(School of Civil Engineering,Suzhou University of Science and Technology,Suzhou,Jiangsu 215011)

机构地区：[1]苏州科技大学土木工程学院,江苏苏州215011

出　　处：《非金属矿》2024年第6期90-93,共4页Non-Metallic Mines

基　　金：国家自然科学基金(51808369);长江科学院开放研究基金资助项目(CKWV20221020/KY);江苏省研究生科研与实践创新计划项目(SJCX24-1941)。

摘　　要：为改善锂渣基胶凝体系水化性能及物理力学性能,以锂渣、矿粉和水泥熟料制备三元复合胶凝材料,并优化了水化硅酸钙/聚羧酸减水剂(C-S-H-PCE)、Na_(2)SiO_(3)、三异丙醇胺(TIPA)3种激发剂的正交配合比。结果表明,C-S-H-PCE明显增加浆体流动度,Na_(2)SiO_(3)显著提升抗压强度和水化性能。相较不掺激发剂的基准组,复配3%C-S-H-PCE、1%Na_(2)SiO_(3)和0.05%TIPA体系的胶凝材料28 d抗压强度提高了5.2%,且72 h放热量最高。Na_(2)SiO_(3)可以促进C-S-H凝胶生成,C-S-H-PCE能够显著降低水泥颗粒与水之间的表面张力,提供更多成核位点促进锂渣后期火山灰反应。TIPA通过加速水化产物形成并优化结构,降低孔隙率。Na_(2)SiO_(3)虽可促进C-S-H生成,但高量Na_(2)SiO_(3)会生成阻碍水化的不溶性硅酸盐。合理配比3种激发剂可显著改善锂渣基胶凝体系的综合性能。To enhance the hydration and physical and mechanical properties of lithium slag-based cementing systems,a ternary composite material was prepared with lithium slag,granulated blast furnace slag and cement clinker.The orthogonal mix ratio of C-S-H-PCE,Na_(2)SiO_(3),and TIPA were optimized.The results showed that C-S-H-PCE greatly increased fluidity of the paste,while Na_(2)SiO_(3) significantly improved the mechanic strength and hydration performance.Compared to the base group without activator,the incorporation of 3%C-S-H-PCE,1%Na_(2)SiO_(3),and 0.05%TIPA in system led to a 5.2%increase in 28 d compressive strength.Furthermore,the heat release at 72 h was the highest.Na_(2)SiO_(3) effectively promoted the formation of C-S-H gel,while C-S-H-PCE significantly reduced the surface tension between cement particles and water,creating more nucleation sites to enhance the pozzolanic reaction during the later stages of lithium slag hydration.TIPA reduced porosity by accelerating the formation of hydration products and optimizing the structure.Although Na_(2)SiO_(3) promoted the formation of C-S-H gel,excessive amounts of Na_(2)SiO_(3) resulted in the generation of insoluble silicates that impeded the hydration process.Reasonable proportion of three activators can significantly improve the comprehensive preformance of lithium slag based gelling system.

关 键 词：水泥 锂渣 矿粉 激发剂 力学强度 水化性能 

分 类 号：TU528[建筑科学—建筑技术科学] X705[环境科学与工程—环境工程]