CTF增效剂提升混凝土抗冻性能研究

doi:10.11896/cldb.23030006

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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 (C_n), mass denudation rate (M_B) and solution suction rate (W_S). 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 (C_n) 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 (C_n) of concrete is smaller after 100 cycles of freezing and thawing and the mass denudation rate (M_B) of concrete is reduced by 12.51%. In addition, when the NaCl solution absorption rate (W_S) 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%.

Key words： concrete CTF synergist frost resistance pore structure fractal dimension

Published: 10 October 2024 Online: 2024-10-23

CLC number:

TU528.1

Fund:National Natural Science Foundation of China(52208249,U21A20150),Youth Science and Technology Foundation of Gansu Province (22JR5RA288),Research and Demonstration of Key Technologies of Green and Smart Highways in Gansu Province (21ZD3GA002), Project of Industrial Support Program for Colleges and Universities in Gansu Province (2022CYZC-25), and Department of Education of Gansu Province ‘Innovation Star' Program of Graduate Student (2023CXZX-447).

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	Articles by authors
	WANG Xi
	ZHANG Yunsheng
	ZHANG Yu
	QIAO Hongxia
	LU Chenggong
	Hakuzweyezu Theogene
	LIU Zhichao
	LI Zhonghui

Cite this article:

WANG Xi,ZHANG Yunsheng,ZHANG Yu, et al. Study on Improving Frost Resistance of Concrete with CTF Synergist[J]. Materials Reports, 2024, 38(19): 23030006-7.

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http://www.mater-rep.com/EN/10.11896/cldb.23030006 OR http://www.mater-rep.com/EN/Y2024/V38/I19/23030006

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