【摘 要】
：
Magnesium fluosilicate, waterglass, sodium fluosilicate, and composite treatment of waterglass and sodium fluosilicate were used as surface treatment agents
【机 构】
：
Civil engineering, Hunan University, Changsha 410082, China
【出 处】
：
The 14th International Congress on the Chemistry of Cement (
论文部分内容阅读
Magnesium fluosilicate, waterglass, sodium fluosilicate, and composite treatment of waterglass and sodium fluosilicate were used as surface treatment agents and their interactions with cement-based materials were studied in this work.Thermal and infrared spectroscopy analyses were conducted to reveal the changes in composition of harden cement pastes after surface treatments.The result showed that these inorganic surface treatment methods could reduce the content of Ca(OH)2 in surface layer of harden cement, while the amount of calcium silicate hydrate (C-S-H) and silica gel were increased.In addition, scanning electron microscope (ESEM) observation and energy dispersive spectroscopy (EDX) analyses confirmed that new products formed in surface layer.Composite treatment of waterglass and sodium fluosilicate performed best.The reactions between waterglass and sodium fluosilicate also played an important role in the composite treatment, while waterglass and sodium fluosilicate could reacted with Ca(OH)2The pore-blocking effect due to the interactions between these inorganic surface treatment agents and matrix of cement-based materials, and consumption of Ca(OH)2 would be the major reasons for improvement in permeability and durability of cement-based materials.
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