A Study on Durability and Microstructural Analysis for Macro Synthetic Fiber Reinforced Concrete with Supplementary Cementitious Materials

Indian journal of science and technology Pub Date : 2024-04-19 DOI:10.17485/ijst/v17i16.701

M. V. M. Reddy, S. Krishnaiah

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Abstract

Background: Thermal cracking, delayed ettringite production and low tensile strength are three significant problems for high-strength concrete. Objectives: The current experimental study aims to determine the durability characteristics of concrete for application in pavements. To test how well the M40 grade of concrete absorbed chloride and water, the amounts of Supplementary Cementitious Materials (SCM) like Granulated Blast-Furnace Slag (GBFS) and fixed amounts of Fly Ash (FA) and Macro Synthetic Fiber (MSF) were optimized. Methods: One sample (S1) was made entirely of Ordinary Portland Cement (OPC) and five samples (S2, S3, S4, S5, and S6) made simply of SCMs, in which OPC was substituted with 20% FA+20% GBFS+1.5% MSF, 20% FA+25% GBFS+1.5% MSF, 20% FA+30% GBFS+1.5% MSF, 20% FA+35% GBFS+1.5% MSF, and 20% FA+40% GBFS+1.5% MSF, respectively, were cast in standard blocks with a volume of one cubic meter for this purpose. Field Emission Scanning Electron Microscopy (FESEM), Fourier-Transform Infrared Spectroscopy (FTIR), and X-ray Diffraction (XRD) investigations are used to examine the number of hydration products created at 28 days, which differ for different percentages of SCMs. Findings: Furthermore, 501, 520, 535, 565, and 590 coulombs are the measured Rapid Chloride Permeability Test (RCPT) values for the S2 to S6 samples. Similarly, the S1 sample is projected to have more than 2600 coulombs, showing a better endurance of samples based on SCMs. The microstructural characterization findings (i.e., XRD, FTIR and FESEM) suggested that GBFS and FA are promising SCMs for enhancing the strength and durability properties of the mix. Novelty and applications: This study validates the viability of using GBFS, FA, and MSF in pavement applications, yielding noteworthy environmental advantages and lowering dependency on OPC. Keywords: Durability, Microstructural investigation, Macro synthetic fiber, Fly ash, Granulated blast furnace slag, Pavements

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添加水泥基材料的宏观合成纤维加固混凝土的耐久性和微观结构分析研究

背景：热裂缝、蚀变岩生成延迟和抗拉强度低是高强度混凝土面临的三大问题。研究目的本实验研究旨在确定应用于人行道的混凝土的耐久性能。为了测试 M40 级混凝土对氯化物和水的吸收能力，对粒化高炉矿渣（GBFS）等辅助胶凝材料（SCM）的用量以及固定用量的粉煤灰（FA）和宏观合成纤维（MSF）进行了优化。方法：一个样品（S1）完全由普通硅酸盐水泥（OPC）制成，五个样品（S2、S3、S4、S5 和 S6）仅由单体材料制成，其中 OPC 由 20% FA+20% GBFS+1.5% MSF、20% FA+25% GBFS+1.5% MSF、20% FA+30% GBFS+1.5% MSF、20% FA+35% GBFS+1.5% MSF 和 20% FA+40% GBFS+1.5% MSF，分别浇铸在体积为一立方米的标准块中。使用场发射扫描电子显微镜 (FESEM)、傅立叶变换红外光谱 (FTIR) 和 X 射线衍射 (XRD) 研究 28 天时生成的水化产物数量，不同比例的单体材料生成的水化产物数量不同。研究结果：此外，S2 至 S6 样品的快速氯化物渗透性测试 (RCPT) 测量值分别为 501、520、535、565 和 590 库仑。同样，S1 样品预计将超过 2600 库仑，这表明基于单体材料的样品具有更好的耐久性。微结构表征结果（即 XRD、FTIR 和 FESEM）表明，GBFS 和 FA 是很有前途的 SCM，可提高混合料的强度和耐久性能。新颖性和应用：本研究验证了在路面应用中使用 GBFS、FA 和 MSF 的可行性，可产生显著的环境优势并降低对 OPC 的依赖性。关键词耐久性微结构研究宏合成纤维粉煤灰粒化高炉矿渣路面

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Indian journal of science and technology

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