Experimental study and numerical simulation of the effect of different fiber types on the basic mechanical properties of shotcrete

Author:

Liu Cheng-Yong1,WANG Han-Qiu1,Liu Xue-Feng2,Niu Ming-Xue2,Wu Ji-Fei3

Affiliation:

1. China Coal Energy Research Institute Co., Ltd

2. Shandong Agricultural University

3. Shandong Energy Group Luxi Mining CO.LTD

Abstract

Abstract

The enhancement effects and mechanisms of different types of fibers on the basic mechanical properties of concrete were analyzed, aiming to guide the selection of suitable fiber types and dosages for grouting projects. This study selected steel fibers, glass fibers, and polypropylene fibers as research subjects. Through laboratory tests, numerical simulations, and field experiments, it investigated the enhancement laws of flexural and compressive strengths of concrete with different dosages of these three fibers. The study shows that: (1) After 28 days of curing, the flexural strength of concrete with steel fibers, glass fibers, and polypropylene fibers peaked at dosages of 2.0%, 1.5%, and 2.0%, respectively. Compared to plain concrete, the increases were 118.6%, 42.86%, and 138.6%, respectively. The compressive strength of concrete increased the most with dosages of 0.5%, 1.0%, and 2.0% for steel fibers, glass fibers, and polypropylene fibers, respectively, with increases of 2.13%, 10%, and 18.3%. It can be seen that the impact of these three fiber types on the compressive strength of concrete is significantly less than their impact on flexural strength. For enhancing flexural strength, the order is polypropylene fibers > steel fibers > glass fibers. Conversely, for compressive strength, the order is polypropylene fibers > glass fibers > steel fibers. (2) Based on ABAQUS numerical simulations, microscopic analysis indicates that fibers, due to their high yield capacity, enhance the connections between concrete elements, reduce stress concentration, and improve the mechanical properties of concrete. (3) For shotcrete, due to its high flexural strength requirements and the tendency of steel and glass fibers to agglomerate, polypropylene fibers at a dosage of 2.0% were preferred. (4) Using the optimal dosage, it was successfully applied to the wet shotcrete support of a return air shaft in a mine, where the maximum deformation of the roof and sides of the tunnel remained within allowable limits, meeting the normal usage requirements of the tunnel. The research findings can offer guidance and reference for the selection and further application of shotcrete.

Publisher

Research Square Platform LLC

Reference16 articles.

1. Vibration vulnerability of shotcrete on tunnel walls during construction blasting;Ahmed L;Tunnelling and Underground Space Technology,2014

2. Spraying characteristics of mining wet shotcrete;Chen L;Construction and Building Materials,2022

3. Flexural fracture toughness and first-crack strength tests of steel fiber-silica fume concrete and its engineering applications;Zhang JP;Strength of Materials,2018

4. Effect of pumping and spraying processes on the rheological properties and air content of wet-mix shotcrete with various admixtures;Chen L;Construction and Building Materials,2019

5. Research on dust suppression technology of shotcrete based on new spray equipment and process optimization;Li P;Advances in Civil Engineering,2019

同舟云学术

1.学者识别学者识别

2.学术分析学术分析

3.人才评估人才评估

"同舟云学术"是以全球学者为主线,采集、加工和组织学术论文而形成的新型学术文献查询和分析系统,可以对全球学者进行文献检索和人才价值评估。用户可以通过关注某些学科领域的顶尖人物而持续追踪该领域的学科进展和研究前沿。经过近期的数据扩容,当前同舟云学术共收录了国内外主流学术期刊6万余种,收集的期刊论文及会议论文总量共计约1.5亿篇,并以每天添加12000余篇中外论文的速度递增。我们也可以为用户提供个性化、定制化的学者数据。欢迎来电咨询!咨询电话:010-8811{复制后删除}0370

www.globalauthorid.com

TOP

Copyright © 2019-2024 北京同舟云网络信息技术有限公司
京公网安备11010802033243号  京ICP备18003416号-3