Pore Structure of Concrete at Negative Temperature Curing in Relation to Strength and Penetration
DUAN Yun1, YANG Zijiang1, WANG Qicai2,*, ZHANG Rongling2, WU Chaoyang1, XUE Yanjin2, WEI Dingbang3
1 School of Civil Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China 2 National and Provincial Joint Engineering Laboratory of Road & Bridge Disaster Prevention and Control, Lanzhou 730070, China 3 Gansu Province Transportation Planning, Survey and Design Institute Co., Ltd., Lanzhou 730030, China
Abstract: To explore the relationship between the pore structure of concrete and its compressive strength and chloride ion permeability in permafrost regions, tests of compressive strength, its resistance to chloride ion penetration and pore structure are designed for concretes with three different strength grades at negative temperature (-3 ℃), based on the ground temperature in permafrost regions. The results show that the proportion of pores above 200 nm significantly increases in the concrete cured at negative temperature, with the threshold pore diameter of concrete increased and the fractal dimension of concrete decreased simultaneously. The critical pore levels of concretes cured at standard and negative temperatures are 50—100 nm and 100—200 nm, respectively. The critical pore levels are significantly increased due to negative temperature curing. The relationship between the compressive strength of concrete and its fractal dimension, porosity and average pore diameter still shows the positive and negative correlation under negative temperature curing, but the degree of correlation between them is reduced. The dual-parameter regression model can accurately describe the quantitative relationship between the strength of concrete and its porosity and average pore diameter. The chloride ion migration coefficient of concrete is positively correlated with the square of the threshold pore diameter and negatively linearly correlated with the fractal dimension. Reducing the threshold pore size can effectively improve the impermeability of concrete.
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2022, Vol. 36 
