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本文研究β-C_2S 和 C_3S 水化物的碳化作用。探讨了相对湿度、CO_2分压、水灰比等因素对低温合成β-C_2S 试体碳化速率和性能的影响。从试验结果认为 CO_2先溶解于水成为碳酸是碳化反应的第一步。发现β-C_2S 和 C_3S 水化物的碳化性能是有区别的。并得出当水化过程中生成的 CH 尚未完全碳化以前,C-S-H 凝胶已开始因碳化而分解,从而 C/S 比逐渐降低直至完全分解为碳酸钙和硅胶。文章还探讨了碳化机理和碳化动力学。从碳化试体强度的迅速增长,提出在水化早期,因碳化促进了硅酸钙的水化而导致强度发展加快。以红外光谱分析和 X 射线衍射分析研究了碳化生成的碳酸钙和硅胶的形态。
This paper studies the carbonation of β-C_2S and C_3S hydrates. The effects of relative humidity, CO 2 partial pressure, and water-cement ratio on the carbonation rate and performance of low-temperature synthesis β-C 2 S were investigated. From the results of the experiment, CO 2 was first dissolved in water to become carbonic acid, which is the first step in the carbonization reaction. The carbonation properties of the β-C_2S and C_3S hydrates were found to be different. It was concluded that the C-S-H gel had already begun to decompose due to carbonization before the CH generated in the hydration process had been fully carbonized, and the C/S ratio gradually decreased until it completely decomposed into calcium carbonate and silica gel. The article also discusses the carbonation mechanism and the carbonation kinetics. From the rapid increase in the strength of the carbonized test pieces, it is proposed that in the early stage of hydration, the hydration of calcium silicate is promoted due to carbonization and the strength development is accelerated. The morphology of calcium carbonate and silica gel formed by carbonization was studied by infrared spectroscopy and X-ray diffraction analysis.