Study on the flexural performance and microstructure of lithium feldspar tailings cementitious filler using mixed fibers

IF 6.2 2区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Developments in the Built Environment Pub Date : 2024-04-01 DOI:10.1016/j.dibe.2024.100455

Daopei Zhu, Suikang Zhang, Xiaoshun Wu

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Abstract

The brittle fracture and toughness of cemented tailings backfill (CTB) are not conducive to underground mining projects. Incorporating fibers may enhance the flexural properties of the CTB. This study used glass (GS) and polypropylene (PP) fibers to fabricate fiber-reinforced cemented lithium feldspar tailing backfill (FCLTB) specimens. The flexural strengths and microstructures of the specimens were analyzed using a three-point flexure test and scanned electron microscopy (SEM). Following a three-point bending test, it was observed that Upon decreasing the amount of GS fiber, the bending strength of the FCLTB specimens initially decreased and then increased. However, with an increase in the PP fiber content, the average bending module of the FCLTB specimens initially reduced and then rose. The combined use of GS and PP fibers significantly improved the toughness of the CLTB samples after the peak. Composite fibers resist the formation of cracks under load.

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使用混合纤维的锂长石尾矿水泥基填料的弯曲性能和微观结构研究

胶结尾矿回填（CTB）的脆性断裂和韧性不利于地下采矿工程。加入纤维可增强 CTB 的抗弯特性。本研究使用玻璃纤维（GS）和聚丙烯纤维（PP）制作了纤维增强型胶结锂长石尾矿回填土（FCLTB）试样。利用三点弯曲试验和扫描电子显微镜（SEM）分析了试样的抗弯强度和微观结构。三点弯曲试验结果表明，随着 GS 纤维用量的减少，FCLTB 试样的弯曲强度先降低后升高。然而，随着 PP 纤维含量的增加，FCLTB 试样的平均弯曲模数先降低后升高。结合使用 GS 和 PP 纤维后，CLTB 试样在峰值后的韧性明显提高。复合纤维可防止负载下裂纹的形成。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Developments in the Built Environment Multiple-

CiteScore

7.40

自引率

1.20%

发文量

审稿时长

22 days

期刊介绍： Developments in the Built Environment (DIBE) is a recently established peer-reviewed gold open access journal, ensuring that all accepted articles are permanently and freely accessible. Focused on civil engineering and the built environment, DIBE publishes original papers and short communications. Encompassing topics such as construction materials and building sustainability, the journal adopts a holistic approach with the aim of benefiting the community.

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