摘要
为了提升锂渣复合水泥浆体早期工作性及强度发展,研究了水化硅酸钙晶核与聚羧酸减水剂复合物(C-S-H-PCE)与三乙醇胺(TEA)对锂渣复合水泥流变性与水化性能协同效应。结果表明,C-S-H-PCE改善了新拌锂渣复合水泥浆体流变性,使得浆体表观黏度及剪切应力逐渐下降。而TEA则显著降低新拌浆体流变性,随着TEA掺量增加,新拌锂渣复合水泥浆体表观黏度及剪切应力逐渐增加。C-S-H-PCE与TEA复掺对锂渣复合水泥浆体凝结时间缩短具有协同作用,可大幅缩短浆体凝结时间,促进早强抗压强度发展。掺加3%C-S-H-PCE和0.5%TEA可分别使浆体初凝和终凝时间缩短70%和72%。当C-S-H-PCE掺量为3%,TEA掺量为0.1%时,锂渣复合水泥砂浆1 d、3 d、7 d及28 d抗压强度分别增长105.9%、78.8%、52.3%及10.1%。C-S-H-PCE通过提供成核位点促进硅酸盐矿物早期水化及锂渣后期火山灰反应。而TEA通过促进水泥及锂渣中铝相溶解,促进钙矾石(AFt)相生成及AFt相向单硫型水化硫铝酸钙(AFm)相转化。
In order to promote rheological behavior and strength enhancement of lithium slag-cement composite binder at early age,synergistic effect of C-S-H-PCE and TEA on the rheological performance and hydration properties of lithium slag-cement composite binder were investigated.The results showed that the addition of C-S-H-PCE could improve the rheological behavior of fresh binder,and decrease viscosity as well as yield stress.The addition of TEA impaired the rheological behavior of fresh binder,and increased viscosity as well as yield stress.C-S-H-PCE and TEA compounding accelerated the hydration process,shortened the setting time obviously,and promoted compressive strength enhancement of composite binder at early age.3%C-S-H-PCE and 0.5%TEA can shorten the primary and final setting time by 70%and 72%,respectively.When the amount of C-S-H-PCE was 3%and TEA was 0.1%,the compressive strength of lithium slag-cement composite binder for 1 d,3 d,7 d and 28 d increased by 105.9%,78.8%,52.3%and 10.1%,respectively.C-S-H-PCE provided nucleation sites for early hydration products of silicate phases,while TEA generated the transformation of AFt to AFm by accelerating the Al phase dissolution in cement and lithium slag.
作者
何燕
丁胡刚
陈娟
张国强
尤春阳
郜志海
He Yan;Ding Hugang;Chen Juan;Zhang Guoqiang;You Chunyang;Gao Zhihai(School of Civil Engineering,Suzhou University of Science and Technology,Suzhou,Jiangsu 215011)
出处
《非金属矿》
北大核心
2023年第5期98-101,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(SJCX22-1577,SJCX23-1722)。
