Silicon carbide waste as a source of mixture materials for cement mortar
Silicon carbide waste as a source of mixture materials for cement mortar作者机构：Key Laboratory of Advanced Civil Engineering Materials Ministry of Education Tongji University Shanghai 201804 China
出 版 物：《Frontiers of Environmental Science & Engineering》 (环境科学与工程前沿（英文）)
年 卷 期：2017年第11卷第5期
页 面：47-54页
核心收录：
学科分类：0830[工学-环境科学与工程（可授工学、理学、农学学位）] 07[理学]
基 金：The authors gratefully acknowledge the financial supports provided by the National Natural Science Foundation of China （Grant Nos. 51678442 51478348 and 51508404） National High-speed Train Union Fund （No. U1534207） Key project of the Shanghai Committee of Science and Technology （No. 15DZ1205003）.
主 题：Silicon carbide waste Cement mortar Fluidity Strength Shrinkage
摘 要：This paper presents an investigation of the feasibility of recycling silicon carbide waste （SCW） as a source of mixture materials in the production of cement mortar. Mortars with SCW were prepared by replacing different amounts of cement with SCW, and the properties of the resulting mortars, such as the fluidity, strength and shrinkage, were studied in this work. Thermogravimetry-differential scanning calorimet;＇y and scanning electron microscopy were employed to understand the reasons for the property changes of the mortars. The results indicate that SCW decreases the initial and l-h fluidity of fresh mortar but improves the loss of fluidity. The mortar with SCW exhibits a lower strength at 3 d and7 d but a higher strength at 28 d and 56 d compared to the control. The shrinkage rate of cement mortar with SCW shows an obvious decrease as the replacement ratio increases. In addition, the content of calcium hydroxide in hardened paste also shows that SCW has some impact on the hydration of the cement-SCW system. The microstructures of the hardened paste also show evidence for a later strength change of mortar containing SCW. This work provides a strategic reference for possibly applying SCW as a mixture material in the production of cement mortar.
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