Microstructural changes caused by carbonation of cement mortar
Microstructural changes caused by carbonation of cement mortar
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DOI：
10.1016/s0008-8846(01)00498-7
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发表时间：
2001-06-01
影响因子：
11.4
通讯作者：
Utgenannt, P
中科院分区：
文献类型：
--
作者：
Johannesson, B;Utgenannt, P
研究了普通波特兰水泥砂浆碳化后比表面积和孔径分布的变化。测量了水蒸气在非碳酸化和碳酸化良好的水泥砂浆上的吸附，以使用BET理论评估两种样品的比表面积的差异。根据测量的解吸，使用开尔文公式计算孔径分布。吸附天平用于测量两种研究样品质量的吸附特性。在这种方法中，干燥和饱和空气在封闭系统中以所需比例混合。该方法的优点之一是样品在测试期间不暴露于二氧化碳，即，可以消除由碳酸化作用对吸附造成的不希望的影响。使用测量的吸附数据计算非碳酸化样品的比表面积，比碳酸化良好的样品高8%。两种样品的孔径分布的差异比比表面积的差异更显著。良好的碳酸化砂浆具有约两倍的体积归因于小孔隙的非碳酸化水泥砂浆。(C)2001爱思唯尔科技有限公司版权所有。
The change of specific surface area and pore size distribution due to carbonation of an ordinary Portland cement mortar is investigated. The adsorption of water vapor on noncarbonated and well-carbonated cement mortar is measured in order to evaluate the difference in specific surface area for the two samples using the BET theory. From the measured desorption the pore size distribution is calculated using the Kelvin formula. A sorption balance is used to measure the sorption characteristics for the two studied sample qualities. In this method dry and saturated air are mixed in desired proportion in a closed system. One of the benefits of the method is that the samples not are exposed to carbon dioxide during testing, i.e., undesired effects caused by carbonation on the sorption can be eliminated. The specific surface area for a noncarbonated sample was calculated, using the measured adsorption data, to be 8% higher than for the well-carbonated sample. The difference in pore size distributions was more marked than the difference in specific surface area for the two samples. The well-carbonated mortar had about twice as much volume attributed to small pores as the noncarbonated cement mortar. (C) 2001 Elsevier Science Ltd. All rights reserved.