摘要
以精炼渣—钢渣—脱硫石膏—矿渣制备固废胶凝材料,探究其在不同养护温度下的强度发展规律和微观固结机理,以XRD、热重、SEM试验表征四元固废胶凝材料体系在低温养护下的水化机理。试验表明,养护温度对胶凝材料的强度增长影响较大,强度与养护温度呈正相关。低温养护条件下,固废原料体系中水解受到抑制,并且水化过程也受低温影响。掺入20%精炼渣后,在低温水化反应前期精炼渣提供较高离子浓度,使水化反应得以在较低温度下继续进行,从而提高胶凝材料的强度。研究结果可为精炼渣改性其他胶凝体系提供参考,为开发低温早强的全固废混凝材料奠定了理论基础。
The solid waste cementitious material was prepared by refining slag,steel slag,desulfurization gypsum,and ore slag,and its strength development law and microscopic consolidation mechanism at different curing temperatures were explored.The hydration mechanism of the four-element solid waste cementitious materials system under low temperature curing was characterized by XRD,thermogravimetric and SEM tests.The test shows that the curing temperature has a great influence on the strength growth of cementitious materials,and the strength is positively correlated with the curing temperature.Under low-temperature curing conditions,the hydrolysis in the solid waste raw material system was inhibited,and the hydration process was also affected by low temperature.After adding 20%of refining slag,the refining slag would provide a higher ion concentration in the early stage of low-temperature hydration reaction,so that the hydration reaction could continue at a lower temperature,thereby improving the strength of the cementitious material.The research results provide a reference for the modification of other cementitious systems by refining slag,and lay a theoretical foundation for the development of full solid waste coagulation materials with early strength at low temperature.
作者
齐子函
李佳洁
倪文
李颖
朱斯陶
毛市龙
QI Zihan;LI Jiajie;NI Wen;LI Ying;ZHU Sitao;MAO Shilong(School of Civil and Resource Engineering,University of Science and Technology Beijing,Beijing 100083,China;Shandong Iron and Steel Co.,Ltd.,Jinan,Shandong 271104,China)
出处
《矿业研究与开发》
CAS
北大核心
2022年第10期58-62,共5页
Mining Research and Development
基金
国家自然科学基金资助项目(41472043)
国家重点研发计划资助项目(2018YFC0808403).
关键词
四元固废体系
低温养护
水化机理
固结机理
Four-element solid waste system
Low temperature curing
Hydration mechanism
Consolidation mechanism
