Open Access

ARTICLE

Study on Mechanical Properties of High Fine Silty Basalt Fiber Shotcrete Based on Orthogonal Design

by Jinxing Wang^1,2,3, Yingjie Yang^1,2,3, Xiaolin Yang^1,2,3, Huazhe Jiao^1,2,3,4,*, Qi Wang^1,2,3, Liuhua Yang^1,2,3, Jianxin Yu^1,2,3, Fengbin Chen^1,2,3

1 State Collaborative Innovation Center of Coal Work Safety and Clean-Efficiency Utilization, School of Civil Engineering, Henan Polytechnic University, Jiaozuo, 454003, China
2 Provincial Key Laboratory of Underground Engineering and Disaster Prevention and Control, School of Civil Engineering, Henan Polytechnic University, Jiaozuo, 454003, China
3 School of Civil Engineering, Henan Polytechnic University, Jiaozuo, 454003, China
4 Key Laboratory of Mine Ecological Effects and Systematic Restoration, Ministry of Natural Resources, Beijing, 100081, China

* Corresponding Author: Huazhe Jiao. Email:

Journal of Renewable Materials 2023, 11(8), 3351-3370. https://doi.org/10.32604/jrm.2023.027512

Received 02 November 2022; Accepted 13 January 2023; Issue published 26 June 2023

Abstract

In order to improve the comprehensive utilization rate of high fines sand (HFS) produced by the mine, full solid waste shotcrete (HFS-BFRS) was prepared with HFS as fine aggregate in cooperation with basalt fiber (BF). The strength growth characteristics of HFS-BFRS were analyzed. And the fitting equation of compressive strength growth characteristics of HFS-BFRS under the synergistic effect of multiple factors was given. And based on the orthogonal experimental method, the effects on the compressive strength, splitting tensile strength and flexural strength of HFS-BFRS under the action of different levels of influencing factors were investigated. The effect of three factors on the mechanical properties of HFS-BFRS, 3, and 28 d, respectively, was revealed by choosing the colloidal sand ratio (C/H), basalt fiber volume fraction (BF Vol) and naphthalene high-efficiency water reducing agent (FDN) as the design variables, combined with indoor tests and theoretical analysis. The results show that the sensitivity of the three factors on compressive strength and flexural strength is C/H > FDN > BF Vol, and splitting tensile strength is BF Vol > FDN > C/H. Finally, the fitting ratio of HFS-BFRS was optimized by the factor index method, and the rationality was verified by the field test. For the fluidity of HFS-BFRS, the slump can be improved by 139% under the action of 1.2% FDN, which guarantees the pump-ability of HFS-BFRS.

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Keywords

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