1. School of Civil Engineering, Lanzhou Institute of Technology, Lanzhou Gansu 730050, China;
2. School of Civil Engineering, Lanzhou Jiaotong University, Lanzhou Gansu 730070, China
Study of Pore Volume Fractal Dimension for Different Air Content Cement Mortar
MA Li1, LI Sheng2, WANG Qi-cai2, YU Ben-tian2, LIU Ya-peng2
1. School of Civil Engineering, Lanzhou Institute of Technology, Lanzhou Gansu 730050, China;
2. School of Civil Engineering, Lanzhou Jiaotong University, Lanzhou Gansu 730070, China
摘要The pore structure parameter of cement mortar with different air contents was tested through Automatic Mercury Porosimeter and Air Void Analysis of Hardened Concrete. A fractal model based on the thermodynamic method was used in the calculation of different scale pore structure fractal dimensions of cement mortar. The relationships between fractal dimensions and porosity, average pore diameter, pore specific surface area, pore spacing coefficient, and total pore volume were analyzed. Results show that the fractal dimension presents multiplicity, which is calculated by the fractal model based on thermodynamics; it can represent the complexity of cement mortar very well. The increase of air content increases the fractal dimension by more than 102 nm pore diameter, and the fractal dimension decreased while the pore diameter was under 102 nm. The increase in age decreases the fractal dimension in the range of 103 nm to 104 nm, and the others showed an increasing trend. The fractal dimension has good correlation with porosity, average pore diameter, and total pore volume among the pore structure parameters and has poor correlation with pore specific surface area in the range of 103 nm to 104 nm and pore diameter in the range of 102 mm to 103 nm. In considering that the pore diameters ranging from 102 nm to 103 nm have a high proportion in the total pores, they can be used as a unified fractal dimension to signify the change of pore structure parameters.
Abstract：The pore structure parameter of cement mortar with different air contents was tested through Automatic Mercury Porosimeter and Air Void Analysis of Hardened Concrete. A fractal model based on the thermodynamic method was used in the calculation of different scale pore structure fractal dimensions of cement mortar. The relationships between fractal dimensions and porosity, average pore diameter, pore specific surface area, pore spacing coefficient, and total pore volume were analyzed. Results show that the fractal dimension presents multiplicity, which is calculated by the fractal model based on thermodynamics; it can represent the complexity of cement mortar very well. The increase of air content increases the fractal dimension by more than 102 nm pore diameter, and the fractal dimension decreased while the pore diameter was under 102 nm. The increase in age decreases the fractal dimension in the range of 103 nm to 104 nm, and the others showed an increasing trend. The fractal dimension has good correlation with porosity, average pore diameter, and total pore volume among the pore structure parameters and has poor correlation with pore specific surface area in the range of 103 nm to 104 nm and pore diameter in the range of 102 mm to 103 nm. In considering that the pore diameters ranging from 102 nm to 103 nm have a high proportion in the total pores, they can be used as a unified fractal dimension to signify the change of pore structure parameters.
基金资助:Supported by the National Natural Science Foundation of China (No. 51268032); the Program for Changjiang Scholars and Innovative Research Team in University of China (No. IRT_15R29)
通讯作者:
MA Li,E-mail:451906654@qq.com
E-mail: 451906654@qq.com
引用本文:
马莉, 李盛, 王起才, 于本田, 刘亚朋. 不同含气量水泥砂浆孔体积分形维数研究[J]. Journal of Highway and Transportation Research and Development, 2016, 10(4): 47-54.
MA Li, LI Sheng, WANG Qi-cai, YU Ben-tian, LIU Ya-peng. Study of Pore Volume Fractal Dimension for Different Air Content Cement Mortar. Journal of Highway and Transportation Research and Development, 2016, 10(4): 47-54.
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2016, Vol. 10 
