Long-Term Performance and Durability of Heat-Treated Alkali-Activated Slag Mortar Containing Silica Fume

IF 1.5 4区工程技术 Q3 CONSTRUCTION & BUILDING TECHNOLOGY

Advances in Civil Engineering Pub Date : 2024-03-28 DOI:10.1155/2024/3969944

Naser Sameti, Ebrahim Ghiasvand, Ehsanollah Zeighami, Seyyed Mohammad Mirhosseini

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Abstract

This study aimed to investigate the combined influence of heat curing and partial replacement of silica fume on the long-term behavior of alkali-activated slag (AAS) mortar. Silica fume replacement levels of 0%, 5%, and 10% were examined, with curing conducted at temperatures of 23 ± 2 and 80°C. The alkaline activator consisted of sodium hydroxide solution (4 M) mixed with sodium silicate in a 3 : 1 ratio by weight. The performance of the fabricated specimens was evaluated through compressive strength testing, mass change analysis, X-ray diffraction, and scanning electron microscopy. Heat treatment resulted in improved performance of AAS mortars, while silica fume replacement also positively influenced mortar behavior. Notably, the 5% replacement rate yielded the most favorable outcomes. However, it was observed that the long-term compressive strength of AAS mortar specimens decreased significantly. Potential adverse factors contributing to this decline were discussed. Furthermore, the durability of mortar samples exposed to adverse conditions was investigated. Results indicated that the combined use of heat curing and a 5% silica fume replacement level produced the best overall performance.

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含硅灰的热处理碱活性矿渣砂浆的长期性能和耐久性能

本研究旨在探讨热固化和部分替代硅灰对碱活性矿渣（AAS）砂浆长期性能的综合影响。硅灰替代水平为 0%、5% 和 10%，固化温度分别为 23±2°C 和 80°C。碱性活化剂由氢氧化钠溶液（4 M）和硅酸钠组成，两者的重量比为 3 ：1 的重量比混合而成。通过抗压强度测试、质量变化分析、X 射线衍射和扫描电子显微镜对制作的试样进行了性能评估。热处理改善了 AAS 砂浆的性能，而硅灰的替代也对砂浆的性能产生了积极影响。值得注意的是，5% 的替代率产生了最有利的结果。不过，据观察，AAS 砂浆试样的长期抗压强度显著下降。讨论了导致这一下降的潜在不利因素。此外，还对暴露在不利条件下的砂浆样本的耐久性进行了调查。结果表明，结合使用热固化和 5%的硅灰替代水平可产生最佳的整体性能。

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

Advances in Civil Engineering Engineering-Civil and Structural Engineering

CiteScore

4.00

自引率

5.60%

发文量

612

审稿时长

15 weeks

期刊介绍： Advances in Civil Engineering publishes papers in all areas of civil engineering. The journal welcomes submissions across a range of disciplines, and publishes both theoretical and practical studies. Contributions from academia and from industry are equally encouraged. Subject areas include (but are by no means limited to): -Structural mechanics and engineering- Structural design and construction management- Structural analysis and computational mechanics- Construction technology and implementation- Construction materials design and engineering- Highway and transport engineering- Bridge and tunnel engineering- Municipal and urban engineering- Coastal, harbour and offshore engineering-- Geotechnical and earthquake engineering Engineering for water, waste, energy, and environmental applications- Hydraulic engineering and fluid mechanics- Surveying, monitoring, and control systems in construction- Health and safety in a civil engineering setting. Advances in Civil Engineering also publishes focused review articles that examine the state of the art, identify emerging trends, and suggest future directions for developing fields.