聚丙烯纤维水泥基复合材料的抗冻性能研究

doi:10.11896/cldb.18080117

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Abstract In order to improve the freezing damage of the concrete structure at the expansion joint of the bridge, this paper designed and prepared a super toughness cement-based composite material (PP-ECC) with polypropylene fiber and studied the antifreeze performance. The mixing process was carried out, and the quality loss of the specimen was used as the evaluation index. The frost resistance of the material under freeze-thaw cycle conditions was analyzed. Based on the indexes of compression resistance, flexural strength and tensile strength, the mechanical pro-perties of the composites subjected to different freeze-thaw cycles were studied, and the time-expansion analysis of the volume expansion deformation of PP-ECC was carried out.The results show that with the increase of the number of freeze-thaw cycles, the mechanical strength shows a downward trend, and the quality loss of the test piece gradually increases. The freezing and thawing volume expansion strain also shows a re-gular variation of the time course with the alternate lifting of the freezing and thawing temperature. In addition, the maximum expansion strain increases significantly with the increase of the number of freeze-thaw cycles. Finally, by comparing the ordinary concrete of the existing research li-terature, the basic performance indexes of PP-ECC materials after the same number of freeze-thaw cycles can be analyzed, including mass loss rate, compressive strength, ultimate tensile strength, ultimate tensile strain, and resistance. The folding strength and the anti-freeze-thaw volume expansion deformation performance can still maintain a high level, the ultimate tensile strain is about 120—400 times that of ordinary concrete, has significant tensile toughness, and the mass loss rate after 300 freeze-thaw cycles. Below 5%, the research results can provide a theoretical reference for the promotion of PP-ECC seamless expansion of bridge expansion joints in the cold regions of China.

Key words： jointless bridge polypropylene fiber engineering cement-based composite material frost resistance mechanical properties freeze-thaw volume expansion deformation

Published: 25 April 2020

CLC number:	TU502+.6
	TU528.58

Fund:This work was financially supported by the National Natural Science Foundation of China (51308471), the National Key R & D Plan (2016YFB0303603-4) and the National Natural Science Foundation Youth Fund of China (2682015ZD13).

About author:: Hesong Jingraduated from Southwest Jiaotong University in June 2019 with a master’s degree in enginee-ring. During the reading period, he was mainly engaged in the research of bridge structure and concrete durability. He has published more than 20 articles in important journals at home and abroad.
Fuhai Ligraduated from Southwest Jiaotong University in 2012, Ph.D. in engineering, deputy director of the National Civil Engineering Experimental Teaching De-monstration Center of Southwest Jiaotong University, deputy director of the Building Materials Laboratory of the School of Civil Engineering, Southwest Jiaotong University, mainly engaged in concrete structure and durability studies. He has published more than 60 articles in important journals at home and abroad, and applied for 12 patents.

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	JIN Hesong
	LI Fuhai
	HE Xiaoyunfeng
	WANG Jiangshan
	HU Dinghan
	HU Zhiming

Cite this article:

JIN Hesong,LI Fuhai,HE Xiaoyunfeng, et al. Research on Frost Resistance of Polypropylene Fiber Cement-based Composite Material[J]. Materials Reports, 2020, 34(8): 8071-8076.

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http://www.mater-rep.com/EN/10.11896/cldb.18080117 OR http://www.mater-rep.com/EN/Y2020/V34/I8/8071

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