The pore solution phase of carbonated cement pastes
The pore solution phase of carbonated cement pastes
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DOI：
10.1016/j.cemconres.2004.06.041
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发表时间：
2005-02-01
影响因子：
11.4
通讯作者：
Page, MM
中科院分区：
文献类型：
--
作者：
Anstice, DJ;Page, CL;Page, MM
将水合水泥浆体样品暴露于具有不同二氧化碳浓度和由不同饱和盐溶液控制的相对湿度的大气中。当酚酞测试表明其整个厚度被碳酸化时，它们被水再饱和并进行孔隙溶液表达和分析。报告了各种碳酸化环境对孔隙溶液组成以及碳酸化产品的孔隙结构和矿物学方面的影响。讨论了不同加速碳化方式对混凝土中钢的腐蚀行为可能产生的影响。特别是，研究表明，使用饱和亚硝酸钠溶液来控制高浓度二氧化碳大气的相对湿度可能会导致气态氮氧化物的释放，从而导致孔隙溶液被亚硝酸盐和硝酸盐污染。 (C) 2004 Elsevier Ltd. 保留所有权利。
Samples of hydrated cement pastes were exposed to atmospheres with various carbon dioxide concentrations at relative humidities controlled by different saturated salt solutions. When carbonated throughout their thickness, as indicated by the phenolphthalein test, they were resaturated with water and subjected to pore solution expression and analysis. The effects of the various carbonating environments on the pore solution composition and on aspects of the pore structure and mineralogy of the carbonated products are reported. Implications regarding the likely effects of different accelerated carbonation regimes on the corrosion behaviour of steel in concrete are discussed. In particular, it is shown that the use of saturated sodium nitrite solution to control the relative humidity of atmospheres with high concentrations of carbon dioxide may cause an evolution of gaseous oxides of nitrogen, which can result in the contamination of the pore solution with nitrite and nitrate salts. (C) 2004 Elsevier Ltd. All rights reserved.