Study on Improving Frost Resistance of Concrete with CTF Synergist
WANG Xi1,2, ZHANG Yunsheng1,2, ZHANG Yu1,2,*, QIAO Hongxia1,2, LU Chenggong1,2, Hakuzweyezu Theogene3,4, LIU Zhichao1,2, LI Zhonghui1,2
1 School of Civil Engineering, Lanzhou University of Technology, Lanzhou 730050, China 2 Gansu Advanced Civil Engineering Materials Engineering Research Center, Lanzhou 730050, China 3 Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China 4 School of Engineering Science, University of Chinese Academy of Sciences, Beijing 100049, China
Abstract: In this work, NaCl solution with 3% mass concentration was used as the medium to test the frost resistance of concrete. The effect of CTF (coal tar fuel) on the frost resistance of concrete was studied by three indexes: ultrasonic wave velocity loss rate (Cn), mass denudation rate (MB) and solution suction rate (WS). At the same time, the effect of CTF on the pore structure in concrete was analyzed deeply. Based on the fractal model of the pore, the relationship between the fractal dimension (D) and the ultrasonic wave velocity loss rate (Cn) was established. The results show that CTF synergist can effectively improve the frost resistance of concrete and the improvement is most obvious when the content is 0.7%. Compared with ordinary concrete, when the cement content is reduced by 10% and the CTF synergist is added by 0.7%, the ultrasonic velocity loss rate (Cn) of concrete is smaller after 100 cycles of freezing and thawing and the mass denudation rate (MB) of concrete is reduced by 12.51%. In addition, when the NaCl solution absorption rate (WS) is decreased by 0.83%, the number of pores with internal diameter specifications less than 100 μm is increased by 180%, and the number of pores with internal diameter specifications larger than 100 μm is decreased by 18.18%.
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