Experimental Investigation on Shear Strength and Microstructure of Chemically Treated Sisal Fiber-Reinforced Concrete

IF 17.7 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY Accounts of Chemical Research Pub Date : 2024-05-17 DOI:10.1155/2024/4830026

Abadi Haftu Kahsay, Belachew Asteray Demiss

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Abstract

The incorporation of sisal fiber into the concrete matrix reduces waste disposal, which has negative environmental impacts. The aim of this study was to perform an experimental investigation on shear strength and microstructure of chemically treated sisal fiber-reinforced concrete (SFRC). In order to accomplish the aim of the study, physical, shear, and mechanical properties of concrete reinforced with chemically treated sisal fiber have been performed. 0.50%, 1.00%, 1.25%, 1.50%, 1.75%, and 2.00% of sodium hydroxide (NaOH) and sulfuric acid (H2SO4) treated sisal fiber were used as an addition to the dry weight average with the help of the American Concrete Institute (ACI) mix design procedure. After the 7th and 28th days of curing, shear strength according to the ASTM D5379M standard and the mechanical properties of concrete have been conducted. For microstructural properties, scanning electron microscopy (SEM) and X-ray diffraction (XRD) were conducted after the concrete was cured for 28 days. Forty-six percent and 20% compressive strength enhancement at the 7th and 28th days of curing was compared to the control mix. Twenty-seven percent enhancement was recorded in the split tensile strength of 1.5% SFRC as compared to the control mix at 28 curing days. A shear strength of 1.5% SFRC was improved by 95% at the 7th curing days and 28% at the 28th curing days as compared to the control mix. As compared to conventional concrete, SFRC shows a denser microstructure. In addition to this, portlandite, quartz, calcium aluminum silicate, and C─S─H crystal are the available phases in the concrete matrix.

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化学处理剑麻纤维加固混凝土的剪切强度和微观结构实验研究

在混凝土基体中加入剑麻纤维可减少对环境造成负面影响的废物处理。本研究旨在对经化学处理的剑麻纤维增强混凝土（SFRC）的剪切强度和微观结构进行实验研究。为了达到研究目的，对化学处理剑麻纤维加固混凝土的物理、剪切和力学性能进行了研究。在美国混凝土协会（ACI）混合设计程序的帮助下，将 0.50%、1.00%、1.25%、1.50%、1.75% 和 2.00% 的氢氧化钠（NaOH）和硫酸（H2SO4）处理过的剑麻纤维添加到干重平均值中。养护第 7 天和第 28 天后，根据 ASTM D5379M 标准测定了混凝土的剪切强度和力学性能。关于微观结构特性，在混凝土养护 28 天后进行了扫描电子显微镜（SEM）和 X 射线衍射（XRD）分析。与对照混合料相比，在养护的第 7 天和第 28 天，抗压强度分别提高了 46% 和 20%。与对照组相比，1.5% SFRC 在养护 28 天时的劈裂拉伸强度提高了 27%。与对照组相比，1.5% SFRC 的剪切强度在第 7 个养护日提高了 95%，在第 28 个养护日提高了 28%。与传统混凝土相比，SFRC 的微观结构更加致密。此外，混凝土基体中还有波长石、石英、硅酸铝钙和 C─S─H 晶体。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.