磷酸氢二钾活化转炉炉渣：增强水化、抗碳化和重金属浸出

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

Cement & concrete composites Pub Date : 2025-01-06 DOI:10.1016/j.cemconcomp.2025.105922

Yanjie Tang , Katrin Schollbach , Sieger van der Laan , Wei Chen

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引用次数: 0

摘要

本文研究了3wt %的磷酸氢二钾（DKP）对碱性氧炉（BOF）炉渣的水化作用。研究结果表明，dkp活化的转炉炉渣膏体具有较好的强度、浸出性能和抗碳化性能。dkp活化转炉炉渣膏体有利于在3天内完成主放热反应。将DKP从1 wt.%增加到3 wt.%，延长了诱导期，同时提高了总水化热。这是由于C2S和褐煤的消耗，以及水榴石、C-S-H凝胶和层状双氢氧化物（LDHs）的形成。同时，孔隙度从40.73降低到22.36%，强度在28天内从1.9 MPa显著提高到42.5 MPa。此外，含有dkp的样品表现出令人满意的抗碳化性和有限的重金属浸出，符合荷兰土壤质量法令（SQD）。该研究强调了磷酸盐活化在提高转炉炉渣基材料的耐久性和环保性能方面的潜力。

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Activation of BOF slag with dipotassium hydrogen phosphate: Enhancing hydration, carbonation resistance, and heavy metal leaching

This study investigates the hydration of basic oxygen furnace (BOF) slag activated by dipotassium hydrogen phosphate (DKP) up to 3 wt%. The findings reveal that DKP-activated BOF slag pastes exhibit improved strength, leaching behavior, and carbonation resistance. DKP-activated BOF slag pastes facilitate the completion of the main exothermic reaction within 3 days. Increasing DKP from 1 to 3 wt% extends the induction period while enhancing overall hydration heat. This is attributed to the consumption of C₂S and brownmillerite, and the formation of hydrogarnet, C-S-H gel, and layered double hydroxides (LDHs). Concomitantly, porosity reduces from 40.73 to 22.36 %, leading to significant strength gaining from 1.9 to 42.5 MPa over 28 days. Moreover, DKP-containing samples exhibit satisfactory carbonation resistance and limited heavy metal leaching, complying with the Dutch Soil Quality Decree (SQD). The study highlights the potential of phosphate activation to enhance the durability and environmental performance of BOF slag-based materials.

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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.