Fiber-reinforced geopolymers made with recycled aggregates for screed flooring and repair applications

Cleaner Materials Pub Date : 2025-01-08 DOI:10.1016/j.clema.2025.100293

Joud Hwalla , Hilal El-Hassan , Joseph J. Assaad , Tamer El-Maaddawy

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Abstract

The increase in greenhouse gas emissions from cement production, along with limited landfill capacity for construction waste, has driven research into finding sustainable alternatives to replace cement and natural aggregates. While cement replacement with geopolymeric binders in mortar and concrete has been proven feasible, replacing natural aggregates with recycled counterparts has led to performance losses. To offset this drawback, different additives, including fibers, have been incorporated into such construction materials. This study evaluates the feasibility of using steel fiber (SF)-reinforced geopolymer (GP) composites incorporating recycled fine aggregates (RFA) for screed flooring and repair applications. GP mixes were prepared with RFA mass substitution up to 100 %, alongside SF volume of 0.5 % and 1 %. Flow values of 125 ± 25 mm were attained within 35 to 70 min. The 7-day compressive strength of GP composites reached 74.0 % to 96.2 % of their 28-day values. RFA substitution reduced compressive strength, elastic modulus, tensile strength, pull-off bond strength, and energy absorption and increased impact indentation and abrasion mass loss by up to 56, 69, 60, 23, 68, 266, and 2025 %, respectively. Conversely, SF addition improved most of these properties except for compressive and pull-off bond strength, which slightly decreased. GP composites made with 0 %, 25 %, and 50 % RFA satisfied the strength requirements for use in structural repair, while those with higher RFA replacement were suitable for non-structural use. Based on BS 8204, GP mixes were categorized as Category A screed flooring except the plain mix made with 100 % RFA, which was categorized as Category B.

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由再生骨料制成的纤维增强地聚合物，用于地坪和修复应用

水泥生产产生的温室气体排放量增加，加上建筑垃圾填埋能力有限，促使研究人员寻找替代水泥和天然骨料的可持续替代品。虽然用砂浆和混凝土中的地聚合物粘结剂替代水泥已被证明是可行的，但用回收的天然骨料替代天然骨料会导致性能损失。为了弥补这一缺点，不同的添加剂，包括纤维，已经加入到这种建筑材料中。本研究评估了将含再生细骨料（RFA）的钢纤维（SF）增强地聚合物（GP）复合材料用于地坪和修复应用的可行性。制备了RFA质量取代率为100%、SF体积为0.5%和1%的GP混合料。在35 ~ 70 min内达到125±25 mm的流量值。GP复合材料的7天抗压强度达到其28天值的74% ~ 96.2%。RFA替代降低了抗压强度、弹性模量、拉伸强度、脱粘强度和能量吸收，并使冲击压痕和磨损质量损失分别增加了56%、69%、60%、23%、68%、266和2025 %。相反，SF的加入提高了除抗压和拉脱粘结强度外的大部分性能，这两个性能略有下降。RFA含量为0%、25%和50%的GP复合材料满足结构修复的强度要求，而RFA含量较高的GP复合材料适用于非结构用途。基于BS 8204， GP混合料被归类为A类地坪，而100% RFA混合料被归类为B类地坪。

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

Cleaner Materials

CiteScore

9.20

自引率

0.00%

发文量