Experimental microscopic study of inner pores of calcareous sand
Experimental microscopic study of inner pores of calcareous sand
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DOI：
10.1179/1432891714z.000000000408
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发表时间：
2014-05
影响因子：
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通讯作者：
Cq Q. Zhu;X. Wang;R. Wang;H-Y. Chen;Qingshan Meng
中科院分区：
文献类型：
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作者：
Cq Q. Zhu;X. Wang;R. Wang;H-Y. Chen;Qingshan Meng
摘要为了研究钙质砂的特殊力学性能，对钙质砂颗粒内部孔隙进行了微观实验。利用飞秒激光切割钙质砂颗粒，得到颗粒的横截面。用三维视频显微观察仪拍摄了砂粒内部孔隙的显微照片。利用MATLAB对显微图像进行处理，分析了孔隙参数。结果表明，钙质砂具有较低的表面孔隙度。孔径>2 mm和1-2 mm的颗粒表面孔隙率分别为0.66%和1.07%。从孔隙数量来看，孔隙分布特征表现为大孔隙少，微孔多。就孔隙面积而言，微孔所占比例小于大孔。发现65%的孔的面积小于1 μm2，并且其中55%或更多是等轴孔。
Abstract Microscopic experiments were performed on the inner pores of calcareous sand particles to ascertain the special mechanical properties of calcareous sand. A femtosecond laser was used to cut the calcareous sand particles to obtain cross-sections of particle. The micrographs of the inner pores of the sand particles were taken with a three-dimensional video microscopic visualiser. The parameters of the pores were analysed through the micrograph processing with MATLAB. The results show that calcareous sand has relatively low surface porosity. The surface porosities of particles with pore diameter >2 mm and those in the range of 1–2 mm are 0·66 and 1·07% respectively. Based upon the number of pores, the distribution characteristics of the pores show that there are fewer macropores but more micropores in the sand. In terms of the area of pores, micropores occupy a smaller proportion than macropores. It was found that 65% of the pores have area <1 μm2, and 55% or more of them are equiaxed pores.