|Table of Contents|

Toughness characteristics and attenuation law of basalt fiber bridge concrete(PDF)

长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2023年2期
Page:
89-99
Research Field:
桥梁与隧道工程
Publishing date:

Info

Title:
Toughness characteristics and attenuation law of basalt fiber bridge concrete
Author(s):
GUO Yin-chuan;  LIU Hong-chang;  SHEN Ai-qin;  WANG Wen-zhen; CHEN Zheng-tong;  DU Qing-xin
(Key Laboratory of Highway Engineering in Special Region of Ministry of Education,Chang’an University, Xi’an 710064, Shaanxi, China)
Keywords:
bridge engineering;  basalt fiber;  bridge concrete;  toughness characteristic;  microstructure;  crack resistance
PACS:
U416.216
DOI:
10.19721/j.cnki.1671-8879.2023.02.009
Abstract:
In order to study the toughening and crack resistance effect of basalt fiber on bridge concrete, bending toughness test and fracture toughness test were designed, the influence law of different of basalt fiber(volume percentage, 0, 0.07%, 0.08%, 0.09%, the same below)on the crack resistance of bridge concrete, and the optimal fiber content were selected. The degradation and attenuation laws of flexural toughness coefficient and fracture energy of ordinary concrete and optimal fiber content group under different load stress levels(0.5 and 0.7)were studied by using dynamic fatigue loading test. Based on the scanning electron microscope(SEM)test, the toughening and crack resistance mechanism of basalt fiber on bridge concrete was analyzed from the micro scopic of view. The results show that basalt fiber can increase the flexural toughness of concrete, play the role of toughening and crack resistance, and help to avoid premature cracking of concrete under load. When the content of basalt fiber is 0.08%, the improvement effect is the most obvious. The flexural toughness coefficient of 28 d is 235% higher than that of ordinary concrete. Basalt fiber significantly improves the fracture energy of concrete, when the fiber content is 0.08%, the lifting effect is the most obvious, which is 247% higher than that of ordinary concrete. Under different load stress levels, the flexural toughness coefficient and fracture energy of bridge concrete gradually decline with the increase of fatigue loading times, and the decrease range is small in the initial stage and large in the later stage. However, adding basalt fiber can slow down the attenuation rate of bridge concrete, improve its ability to resist fatigue cracking, and then prolong the fatigue life of bridge concrete. The good bonding performance between the fiber and the cement matrix makes the basalt fiber form a stable disordered three-dimensional network structure in the concrete, which plays the role of secondary micro reinforcement. Through the friction between the basalt fiber and the cement matrix and the pulling effect of the fiber, the energy required for the crack propagation of the bridge concrete is consumed, which plays the role of toughening and crack resistance.4 tabs, 11 figs, 28 refs.

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Last Update: 2023-03-30