Microstructure and Properties of Cement Foams Prepared by Magnesium Oxychloride Cement
来源期刊：Journal Of Wuhan University Of Technology Materials Science Edition2015年第2期
论文作者：王发洲 YANG Lu GUAN Lingyue HU Shuguang
文章页码：331 - 337
摘 要：Microstructural features including pore size distribution, cell walls and phase compositions of magnesium oxychloride cement foams(MOCF) with various MgO powders and water mixture ratios were studied. Their infl uences on compressive strength, water absorption and resistance of MOCF were also discussed in detail. The experimental results indicated that moderate and slight excess MgO powders(MgO/MgCl2 molar ratios from 5.1 to 7) were beneficial to the formation of excellent microstructure of MOCF, but increasing water contents(H2O/MgO mass ratios from 0.9 to 1.29) might result in opposite conclusions. The microstructure of MOCF produced with moderate and slight excess MgO powders could enhance the compressive strength, while serious excess MgO powders addition(MgO/MgCl2 molar ratios = 9) would destroy the cell wall structures, and therefore decrease the strength of the system. Although MOCF produced with excess MgO powders could decrease the water absorption, its softening coefficient was lower than that of the material produced with moderate MgO powders. This might be due to the instability of phase 5, the volume expansion and cracking of cell walls as immersed the sample into water.
王发洲1，YANG Lu1,2，GUAN Lingyue2，HU Shuguang1
1. State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology2. School of Materials Science and Engineering, Wuhan University of Technology
摘 要：Microstructural features including pore size distribution, cell walls and phase compositions of magnesium oxychloride cement foams(MOCF) with various MgO powders and water mixture ratios were studied. Their infl uences on compressive strength, water absorption and resistance of MOCF were also discussed in detail. The experimental results indicated that moderate and slight excess MgO powders(MgO/MgCl2 molar ratios from 5.1 to 7) were beneficial to the formation of excellent microstructure of MOCF, but increasing water contents(H2O/MgO mass ratios from 0.9 to 1.29) might result in opposite conclusions. The microstructure of MOCF produced with moderate and slight excess MgO powders could enhance the compressive strength, while serious excess MgO powders addition(MgO/MgCl2 molar ratios = 9) would destroy the cell wall structures, and therefore decrease the strength of the system. Although MOCF produced with excess MgO powders could decrease the water absorption, its softening coefficient was lower than that of the material produced with moderate MgO powders. This might be due to the instability of phase 5, the volume expansion and cracking of cell walls as immersed the sample into water.
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