|Table of Contents|

Bending and Impact Test on Modified Synthetic Fiber Reinforced Concrete(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2022年06期
Page:
24-33
Research Field:
建筑材料
Publishing date:

Info

Title:
Bending and Impact Test on Modified Synthetic Fiber Reinforced Concrete
Author(s):
LI Chang-hui1;  YANG Fang1;  WANG Qi-cai2;  CHEN Yu1;  WEI Zhi-yuan3;  WU Kun1
(1. School of Transportation Science and Engineering, Civil Aviation University of China, Tianjin 300300, China; 2. School of Civil Engineering, Tianjin University, Tianjin 300384, China; 3. School of Civil Engineering and Architecture, Guangxi University, Nanning 530004, Guangxi, China)
Keywords:
road engineering;  modified synthetic polypropylene fiber reinforced concrete;  impact test;  four-point bending test;  flexural performance;  impact resistance performance
PACS:
U414
DOI:
10.19815/j.jace.2022.01052
Abstract:
Aiming at the situation that ordinary concrete pavement was easy to crack and service life cannot reach the design life, synthetic polypropylene fiber and polyacrylonitrile fiber were added to ordinary concrete to improve the flexural performance and impact toughness of concrete. Four-point bending tests were carried out on modified synthetic polypropylene fiber reinforced concrete and polyacrylonitrile fiber reinforced concrete. The impact test and the impact test after freeze-thaw cycles were carried out by a self-designed impact test device. The test results show that the synthetic polypropylene fibers with lengths of 20 mm and 40 mm can significantly improve the flexural toughness and impact times of concrete without affecting the compressive strength. The impact times of synthetic polypropylene fiber concrete after freeze-thaw are significantly lower than those of ordinary concrete. In terms of flexural toughness and impact resistance performance, the modified synthetic polypropylene fiber has the best improvement effect, followed by polyacrylonitrile fiber, and the synthetic polypropylene fiber with a length of 40 mm is slightly stronger than the synthetic polypropylene fiber with a length of 20 mm. In terms of flexural toughness, compared with plain concrete, the concrete with 40 mm synthetic polypropylene fiber increased by 60.09%-120.62%. The initial crack impact times and failure impact times of concrete mixed with synthetic polypropylene fiber with a length of 40 mm before freezing and thawing are the highest in the impact test, which are 114.29%-157.14% and 120%-306.67% higher than those of plain concrete, and 5.56%-23.53% and 15% higher than those of concrete mixed with synthetic polypropylene fiber with a length of 20 mm. The test results can provide reference for the construction of concrete pavement.

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Last Update: 2022-12-20