Low-carbon high-strength engineered geopolymer composites (HS-EGC) with full-volume fly ash precursor: Role of silica modulus

IF 7.2 2区工程技术 Q1 CHEMISTRY, MULTIDISCIPLINARY

Journal of CO2 Utilization Pub Date : 2024-10-01 DOI:10.1016/j.jcou.2024.102948

Ling-Yu Xu , Jian-Cong Lao , Lan-Ping Qian , Mehran Khan , Tian-Yu Xie , Bo-Tao Huang

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引用次数: 0

Abstract

In this study, the influence of the silica modulus of alkaline activators on the overall performances of pure fly ash (FA)-based High-Strength Engineered/Strain-Hardening Geopolymer Composites (HS-EGC/SHGC) was comprehensively studied. The developed HS-EGC successfully presented simultaneous high compressive strength (over 90 MPa) and high tensile ductility (over 6.0 %) for the first time. Tensile strain-hardening and over-saturated cracking phenomena were observed for all the HS-EGC mixes. It was found that the increase of the silica modulus from 1.0 to 2.0 reduced the tensile strength and strain energy density of HS-EGC, but the most distinguished overall mechanical index was achieved in the mix with the silica modulus of 1.5. Additionally, the underlying mechanism behind the mechanical performances was explored by Back Scattering Electron and Energy Dispersive Spectroscopy (BSE-EDS) tests. According to the data comparison from literature review, the good sustainability and market potential of the developed material were successfully demonstrated, and the developed HS-EGC pushed the performance envelope of pure FA-based EGC materials. The findings could help promote the future development and practical applications of this strain-hardening geopolymer material with both good sustainability and high mechanical performances.

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使用全量粉煤灰前体的低碳高强度工程土工聚合物复合材料（HS-EGC）：二氧化硅模量的作用

本研究全面探讨了碱性活化剂的硅模量对纯粉煤灰（FA）基高强度工程/应变硬化土工聚合物复合材料（HS-EGC/SHGC）整体性能的影响。所开发的 HS-EGC 首次成功地同时实现了高抗压强度（超过 90 兆帕）和高拉伸延性（超过 6.0%）。所有 HS-EGC 混合材料都出现了拉伸应变硬化和过饱和开裂现象。研究发现，二氧化硅模量从 1.0 增加到 2.0 会降低 HS-EGC 的拉伸强度和应变能密度，但二氧化硅模量为 1.5 的混合料的整体机械指数最为突出。此外，我们还通过背散射电子和能量色散光谱（BSE-EDS）测试探索了力学性能背后的内在机理。根据文献综述的数据对比，成功证明了所开发材料的良好可持续性和市场潜力，并且所开发的 HS-EGC 突破了纯 FA 型 EGC 材料的性能极限。这些研究结果有助于促进这种具有良好可持续性和高机械性能的应变硬化土工聚合物材料的未来发展和实际应用。

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

Journal of CO2 Utilization CHEMISTRY, MULTIDISCIPLINARY-ENGINEERING, CHEMICAL

CiteScore

13.90

自引率

10.40%

发文量

406

审稿时长

2.8 months

期刊介绍： The Journal of CO2 Utilization offers a single, multi-disciplinary, scholarly platform for the exchange of novel research in the field of CO2 re-use for scientists and engineers in chemicals, fuels and materials. The emphasis is on the dissemination of leading-edge research from basic science to the development of new processes, technologies and applications. The Journal of CO2 Utilization publishes original peer-reviewed research papers, reviews, and short communications, including experimental and theoretical work, and analytical models and simulations.