Regulating the workability of NaOH-activated blast furnace slag pastes by considering the mutual inhibition between calcium-sodium aluminosilicate hydrate and hydrotalcite during precipitation

IF 10.8 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Cement & concrete composites Pub Date : 2025-03-13 DOI:10.1016/j.cemconcomp.2025.106022

Ruiquan Jia , Yanxin Chen , Shaowu Jiu , Shiyu Zhuang

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引用次数: 0

Abstract

Regulating the workability of NaOH-activated blast furnace slag (NAS) pastes is essential for their effective application. Based on the mutual inhibition between calcium-sodium aluminosilicate hydrate (C-N-A-S-H) and hydrotalcite (LDH) during precipitation (MICL), a novel strategy for regulating paste workability was developed. The workability losses, including the slump loss and the setting time, occurred through hydrate formation and was controlled by the MICL mechanism. The inhibition of the LDH formation by C-N-A-S-H caused the formation of Ca-containing LDH by replacing Mg²⁺ with Ca²⁺. With moderate NaAlO₂ addition, C-N-A-S-H and Ca-containing LDH slowly formed because the difference in the degree of mutual inhibition between C-N-A-S-H and LDH during precipitation (DMICL) was minimized. Therefore, workability losses occurred slowly. However, at relatively high (low) NaAlO₂ addition amounts, the DMICL was large, and Ca-containing LDH (C-N-A-S-H) quickly formed; thus, workability losses occurred rapidly. A moderate addition of NaAlO₂ with 1 % Al₂O₃ decelerated the workability losses and increased the compressive strength.

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考虑水合铝硅酸钙钠与水滑石在沉淀过程中的相互抑制作用，调控氢氧化钠活化的高炉矿渣膏体的和易性

调节氢氧化钠活化矿渣膏体的和易性是矿渣膏体有效应用的关键。基于水合铝硅酸钙钠（C-N-A-S-H）和水滑石（LDH）在沉淀（MICL）过程中的相互抑制作用，提出了一种调节膏体和易性的新策略。工作性损失，包括坍落度损失和凝固时间，是通过水合物形成产生的，并受MICL机制控制。C-N-A-S-H对LDH形成的抑制作用是通过Ca2+取代Mg2+形成含ca的LDH。适量NaAlO2的加入使沉淀过程中C-N-A-S-H与LDH相互抑制程度的差异（DMICL）减小，C-N-A-S-H和含ca LDH缓慢形成。因此，可加工性损失发生缓慢。而NaAlO2添加量相对高（低）时，DMICL较大，含ca LDH （C-N-A-S-H）快速形成；因此，可加工性损失迅速发生。适量添加1% Al2O3的NaAlO2可减缓和易性损失，提高抗压强度。

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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.