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Microstructural changes caused by carbonation of cement mortar

机译：水泥砂浆碳化引起的微观结构变化

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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 percent 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.
机译：研究了普通硅酸盐水泥砂浆碳化引起的比表面积和孔径分布的变化。测量水蒸气在未碳化和碳化良好的水泥砂浆上的吸附，以便使用BET理论评估两个样品的比表面积差异。根据测得的解吸量，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，干燥和饱和的空气在密闭系统中按所需比例混合。该方法的优点之一是样品在测试过程中不会暴露在二氧化碳中，即可以消除碳酸化对吸附的不良影响。使用测得的吸附数据，非碳酸化样品的比表面积要比碳酸化程度高的样品高8％。孔径分布的差异比两个样品的比表面积差异更明显。碳化程度高的砂浆由于小孔而产生的体积约为非碳化水泥砂浆的两倍。

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