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作者机构:School of Civil Engineering and Architecture Anhui University of Science and Technology Huainan232001 China Institute of Environment-friendly Materials and Occupational Health Anhui University of Science and Technology Wuhu241003 China Department of Civil and Environmental Engineering The Hong Kong Polytechnic University Hung Hom Kowloon Hong Kong
出 版 物:《SSRN》
年 卷 期:2022年
核心收录:
主 题:Compressive strength
摘 要:Spent waterglass foundry sand (SwFS) is a major waste in foundry industry, and should be disposed preferentially. Two SwFSs subjected to 100℃ (SwFS₁) and 800℃ (SwFS₈) were prepared to investigate their effects on the flow, compressive strength, micromechanical properties and pore structure of AASM. Experimental results confirmed that the soluble properties and content of SwFS determined the overall performance of AASM. Both kinds of SwFSs increased the flow values of AASM due to additional silicates. SwFS₁ suffered to 100℃ with high solubilities of the dried waterglass coating released silica tetrahedron into the activation system, contributing to the formation of more and additional hydration products. As a result, the overall performance from the aspects of micro- and macro- mechanical properties, and microstructure of AASM was enhanced. Specially, the compressive strength of SwFS₁-added AASM mortars was increased at all ages, like by 28.9—49.4% at 28d. Whereas, SwFS₈ with low solubilities of waterglass exerted weaker effects on the performance of AASM as compared with SwFS₁. The compressive strength of SwFS₈-added AASM mortars was slightly higher than that of the control mixture, and the maximum increment at 28d was 9.4% in SwFS₈100. In summary, this paper confirmed the feasibility of using SwFS as reactive fine aggregates for AASM owing to the the dried waterglass coating . It can be incorporated into AASM in a much safer manner without compromising the mechanical strength. © 2022, The Authors. All rights reserved.