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首页> 外文期刊>Magazine of Concrete Research >Characterisation of micro- and mesoporosity in Portland cement at elevated temperatures
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Characterisation of micro- and mesoporosity in Portland cement at elevated temperatures

机译：高温条件下波特兰水泥的微孔和中孔特性

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In this paper, computer tomography is employed to characterise porosity, which plays a critical role in determining the mechanical response of cementitious materials under thermal load. Hydrated OPC-53 specimens are analysed at meso- and microscales, while subjected to temperatures of 27, 100, 400, 500 and 800 degrees C, using high-resolution computer tomography (HRCT) and microtomography. Using two- and three-dimensional image-processing techniques, the system of pores and pore network is analysed. As the temperatures increased from 27 degrees C to 800 degrees C, an 800% increase in the number of pores at mesoscale and a 1400% increase in the number of pores at microscale were observed from HRCT and microtomography data, respectively. The number of micropores surrounding the mesopores increases with temperature, thereby forming a pore network, which coalesces into a failure plane, causing deterioration in compressive strength.
机译：本文采用计算机层析成像技术来表征孔隙率，它在确定热负荷下胶凝材料的机械响应中起着至关重要的作用。使用高分辨率计算机断层扫描（HRCT）和显微断层摄影术，在27、100、400、500和800摄氏度的温度下，对中，微型水合OPC-53标本进行了分析。使用二维和三维图像处理技术，分析了孔隙和孔隙网络的系统。随着温度从27摄氏度增加到800摄氏度，分别从HRCT和显微断层扫描数据中观察到中尺度的孔数量增加了800％，微观尺度的孔数量增加了1400％。围绕中孔的微孔的数量随着温度的增加而增加，从而形成孔网络，该孔网络聚集成破坏平面，从而导致抗压强度的降低。

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