Estimation of Porosity and Pore Distribution in Hydrated Portland Cement at Elevated Temperatures using Synchrotron Micro Tomography
Estimation of Porosity and Pore Distribution in Hydrated Portland Cement at Elevated Temperatures using Synchrotron Micro Tomography
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DOI：
10.3151/jact.17.34
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发表时间：
2019-01-01
影响因子：
2
通讯作者：
Agrawal, Ashish Kumar
中科院分区：
文献类型：
--
作者：
Pavani, Harsha Praneeth;Tadepalli, Tezeswi;Agrawal, Ashish Kumar
混凝土的孔隙率会影响其力学性能和耐久性，在其暴露于极端温度下，PC中的化学和物理变化会影响混凝土整体的完整性，因为它的粘合性能。尝试在27 ℃、100 ℃、400 ℃、500 ℃和800 ℃的温度下使用同步加速器显微断层摄影术分析水合PC中的孔隙率。这些温度在热分析期间发生的质量损失和相变的背景下是重要的。进行图像分析以估计所有单个2D切片的孔隙率、半径和孔隙圆度。进行3D分析以估计样品中存在的孔的直径、面积和体积。在27 ℃和800 ℃下，2D切片中的孔的数量从5974增加到11564;而在27 ℃下样品中存在的孔的总数为317，在800 ℃下为3361。随着温度的升高，在27 ℃时，947 μ m（2）的孔隙面积占体积百分比为44.16，而在800 ℃时，136 μ m（2）的孔隙面积占体积百分比为41。
The porosity of concrete affects the mechanical properties and durability, during its exposure to extreme temperatures where the chemical and physical changes in PC affect the integrity of concrete as a whole because of its binding properties. An attempt is made to analyze the porosity in hydrated PC using synchrotron micro-tomography at temperatures of 27 degrees C, 100 degrees C, 400 degrees C, 500 degrees C, and 800 degrees C. These temperatures are significant in the context of the mass loss and phase changes taking place during the thermal analysis. Image analysis is carried out to estimate porosity, radius, and circularity of pores for all the individual 2D slices. 3D analysis is carried out to estimate the diameter, area, and volume of pores present in the sample. The number of pores in the 2D slices has increased from 5974 to 11564 at 27 degrees C and 800 degrees C; while the total number of pores present in the sample at 27 degrees C is 317 and at 800 degrees C it is 3361. With the increase in temperatures, the area of pores 947 mu m(2) contributed to 44.16 volume percent at 27 degrees C, whereas at the temperatures of 800 degrees C the area of 136 mu m(2) pores volume percent is 41.