高延性水泥基复合材料用短切PVA纤维的长度优选研究

doi:10.11896/cldb.21080025

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Abstract In order to optimize the PVA fiber length for high ductility cementitious composites (HDCC), the PVA fibers with 6 mm, 9 mm, 12 mm, 18 mm and 24 mm were adopted in this study, then the effects of PVA fiber length on the workability, mechanical properties and bridging abilities of HDCC were investigated. Results showed that the fluidity of fresh HDCC decreased gradually with the increase of fiber length, and the fluidity significantly decreases 39% when the fiber length increases from 6 mm to 9 mm. The compressive strength and flexural strength of HDCC increase with the addition of fiber, but it has little correlation with the fiber length. HDCC with 18 mm fibers showed the highest bending strength, while HDCC with 9 mm fibers showed the highest mid-span deflection and bending energy consumption. Micromechanical analysis shows that with the increase of fiber length, the fiber bridging abilities are stronger, the increase of fiber bridging stress and complementary energy gradually slows down due to seriously ruptured effect of fibers. Based on the test and calculation results of HDCC working properties, mechanical properties and fiber bridging capacity, the more appropriate choice of 9 mm fibers is obtained.

Key words： HDCC fiber length working performance mechanical property bridging ability

Published: Online: 2023-07-10

CLC number:

TU528

Fund:Zhejiang Natural Science Foundation Project(LTGS23E090002),the National Natural Science Foundation of China (51778133) and the Technology Program of POWERCHINA Huadong Engineering Corporation Limited(KY2021-ZD-01).

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	Articles by authors
	DING Cong
	REN Jinming
	WANG Yongming
	LI Xinyu
	YU Bing
	GUO Liping

Cite this article:

DING Cong,REN Jinming,WANG Yongming, et al. Study on PVA Fiber Length Optimization for High Ductility Cementitious Composites[J]. Materials Reports, 2023, 37(13): 21080025-8.

URL:

http://www.mater-rep.com/EN/10.11896/cldb.21080025 OR http://www.mater-rep.com/EN/Y2023/V37/I13/21080025

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