Nepheline-based water-permeable bricks from coal gangue and aluminum hydroxide

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• 作者：Xiu-Wen Wu ; Hong-Wen Ma ; Nan Wu ; Chun-Qing Shi ; Zhi-Yuan Zheng and Ya-Fang Wang
• 刊名：Environmental Progress & Sustainable Energy
• 出版年：2016
• 出版时间：May 2016
• 年：2016
• 卷：35
• 期：3
• 页码：779-785
• 全文大小：463K
• ISSN：1944-7450

文摘

Nepheline-based water-permeable bricks are prepared with coal gangue and aluminum hydroxide by raw material pretreating, mixing, isostatic molding, roasting, and self-curing. These bricks exhibit balance between their mechanical and water-permeable properties. In this study, two main factors, the raw material ratio and the molding pressure, are studied. The mineral phase, porous structure, and mechanical properties of the samples are characterized by X-ray diffraction, scanning electron microscopy and mercury injection, respectively. The compressive strength and water permeability of the bricks meet Chinese industry standard JC/T945-2005 for water-permeable bricks. The compressive strengths of the samples are between 30.6 and 34.3 MPa. The permeability coefficients range from 1.37 ×10−2 cm s⁻¹ to 1.55 ×10−2 cm s⁻¹.