三乙醇胺络合作用下钢渣的水化特性  

Hydration Characteristics of Steel Slag Under Complexing of Triethanolamine

作　　者：常磊 黄炳银 王剑锋[1] 刘辉[1] 王亚丽[1] 崔素萍[1,2] CHANG Lei;HUANG Bingyin;WANG Jianfeng;LIU Hui;WANG Yali;CUI Suping(College of Materials Science and Engineering,Beijing University of Technology,Beijing 100124,China;College of Carbon Neutrality Future Technology,Beijing University of Technology,Beijing 100124,China)

机构地区：[1]北京工业大学材料科学与工程学院,北京100124 [2]北京工业大学碳中和未来技术学院,北京100124

出　　处：《硅酸盐学报》2024年第5期1621-1630,共10页Journal of The Chinese Ceramic Society

基　　金：北京市科技计划项目(Z221100007522002);国家自然科学基金(52202017)。

摘　　要：三乙醇胺(TEA)作为外加剂常用于提高钢渣胶凝活性,但目前关于TEA对钢渣水化的研究仍集中在钢渣-水泥复合体系,难以明确TEA对钢渣水化特性的影响。本工作将TEA引入纯钢渣体系,通过抗压强度、水化热、热重、物相分析、络合能力测定和溶解特性分析来表征TEA络合作用下纯钢渣的水化特性。结果表明:TEA显著提高了硬化钢渣浆体早期及后期抗压强度,主要原因是TEA促进了钢渣中铝相(C3A、C12A7)和铁相(C2F)的水化及其与CaCO3之间的反应,生成了对抗压强度有利的单碳型水化碳铝酸盐[C4(A,F)■H11],从而提高了钢渣浆体的水化程度。TEA对水化的促进与TEA的络合作用有关,TEA可以与Ca^(2+)、Al^(3+)、Fe^(3+)3种金属离子络合,在一定范围内(TEA与金属离子摩尔比小于等于1时),TEA与金属离子间的络合能力从强到弱依次为Fe^(3+)、Al^(3+)、Ca^(2+)。TEA通过络合作用促进了钢渣的溶解,从而促进了钢渣的水化。Introduction Steel slag is a solid waste produced from steelmaking,which has a potential cementitious activity.However,its cementitious activity is much lower than that of Portland cement.Mechanical grinding,acid activation,alkali activation,high-temperature curing,modification/reconstruction and organic activation methods are commonly used to improve the hydraulic activity of steel slag.Triethanolamine is commonly used as an organic admixture to improve cementitious activity of steel slag.The existing research on the hydration of TEA on steel slag still focuses on a steel slag-cement composite system,in which the proportion of cement is higher and the hydration rate is faster,so the results obtained are related to cement hydration,and it is difficult to characterize the effect of TEA on steel slag.It is thus necessary to investigate the hydration of pure steel slag in the presence of triethanolamine.In this paper,the hydration characteristics of pure steel slag under the complexation of TEA were characterized by compressive strength,heat of hydration,thermogravimetry,phase analysis,complexation ability and dissolution characteristics as well.Methods The compressive strength of hardened steel slag paste was tested.In this work,the hydration characteristics of steel slag were investigated at different TEA concentrations,and the concentrations selected were 0,500,1000 mg/L and 2000 mg/L.A mass ratio of TEA solution to steel slag was kept at 0.35.The size of test block was 20 mm×20 mm×20 mm,and the curing age was 3,7 d and 28 d.In the process of compressive strength testing,the test entrance force was set to be 200 N,and the pressure was applied by force control,and the pressure rate was 100 N/s.After the compressive strength was tested,the specimens were smashed(<5 mm)and the center portion of the specimens was immersed in an isopropanol solution to terminate hydration,and the terminated hydrated steel slag pieces were dried in a vacuum drying oven at 40℃.After drying,steel slag pieces were ground and sieved th

关 键 词：钢渣 三乙醇胺 络合 水化 

分 类 号：TU526[建筑科学—建筑技术科学]