Effects of surface-activated coal gangue aggregates on properties of cement-based materials |
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Authors: | Quanbing Yang Miaoxiong Lü Yongbing Luo |
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Affiliation: | 1. Key Laboratory of Advanced Civil Engineering Materials of Ministry of Education (Tongji University), Shanghai, 201804, China 2. Building Material Research Institute of Fujian, Fuzhou, 350002, China 3. Fujian Yuanxin Environmental Protection Science & Technology Co., Ltd., ??, China
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Abstract: | Effects of calcined coal gangue (CG) aggregates treated by the surface thermal activation on the flowability and strength, and paste-CG aggregate interfaces of the cement-based material were investigated. The experimental results show that the compressive and flexural strength of the cement-based material with the calcined CG aggregates is much higher than that of the material with the natural CG aggregates, but the flowability of the material with calcined CG is significantly reduced with the calcined time. The strength of the material with the calcined CG aggregates only increases little with the calcined time at the same w/c ratio, but is reduced with the calcined time at the same flowability. The CG aggregates calcined by the surface thermal activation obviously overcomes the disadvantages of fully calcined CG. |
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Keywords: | coal gangue aggregate cement-based material strength flowability |
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