Preparation of performance-enhanced alkali-activated slag using a plant-derived chelator

IF 13.1 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Cement & concrete composites Pub Date : 2025-09-11 DOI:10.1016/j.cemconcomp.2025.106332

Weibo Tan , Peiyuan Chen , Yonghui Wang , Peng Qian , Zeren Chen , Jialai Wang

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Abstract

This study aims to investigate the effects of tannic acid (TA) as a plant-derived chelator on the performance of alkali-activated slag (AAS). The influence of different dosages of TA (0.1 %, 0.2 %, 0.3 %, and 0.5 %) on rheological behavior, setting time, hydration evolution, hydration products, ion concentration, pore structure, elastic modulus, compressive strength and shrinkage character of AAS mortar was analyzed. The results indicate that, due to the particle adsorption and Ca²⁺ complexation abilities of TA, it can significantly and multi-dimensionally enhance the performance of AAS. As the content of TA increases, the setting time of AAS is prolonged by 125–820 min, while the flowability grows by 8–43.9 %. Most importantly, TA reduced the 28d autogenous shrinkage of AAS mortar by 21.3–54.5 % while significantly increasing the compressive strength by 25.4–46.1 %, highlighting the effectiveness of TA as an additive for AAS. Compared to commercial additives, TA is economical, efficient, and offers significant ecological benefits. The results contribute to the decarbonization of AAS admixture and the development of specialized admixture for AAS.

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利用植物源螯合剂制备增强型碱活性矿渣

本研究旨在探讨单宁酸作为植物源螯合剂对碱活性渣（AAS）性能的影响。分析了不同掺量的TA（0.1%、0.2%、0.3%、0.5%）对AAS砂浆流变行为、凝结时间、水化演化、水化产物、离子浓度、孔隙结构、弹性模量、抗压强度和收缩特性的影响。结果表明，由于TA的颗粒吸附和Ca2+络合能力，它可以显著地、多维地增强AAS的性能。随着TA含量的增加，AAS的凝结时间延长125 ~ 820 min，流动性提高8 ~ 43.9%。最重要的是，TA使AAS砂浆28d自缩水率降低21.3 ~ 54.5%，抗压强度显著提高25.4 ~ 46.1%，凸显了TA作为AAS添加剂的有效性。与商业添加剂相比，TA具有经济、高效和显著的生态效益。研究结果为原子吸收剂的脱碳和原子吸收剂专用掺合料的研制提供了理论依据。

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

Cement & concrete composites 工程技术-材料科学：复合

CiteScore

18.70

自引率

11.40%

发文量

459

审稿时长

65 days

期刊介绍： Cement & concrete composites focuses on advancements in cement-concrete composite technology and the production, use, and performance of cement-based construction materials. It covers a wide range of materials, including fiber-reinforced composites, polymer composites, ferrocement, and those incorporating special aggregates or waste materials. Major themes include microstructure, material properties, testing, durability, mechanics, modeling, design, fabrication, and practical applications. The journal welcomes papers on structural behavior, field studies, repair and maintenance, serviceability, and sustainability. It aims to enhance understanding, provide a platform for unconventional materials, promote low-cost energy-saving materials, and bridge the gap between materials science, engineering, and construction. Special issues on emerging topics are also published to encourage collaboration between materials scientists, engineers, designers, and fabricators.