Microstructural properties of alkali-activated mortars prepared from Fenton oxidation and heat-treated dyeing sludge as the substitutions of slag

IF 7.4 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Construction and Building Materials Pub Date : 2024-11-14 DOI:10.1016/j.conbuildmat.2024.139196

Dongyang Tian , Xiaocong Yang , Yongsheng Kang , Dongshuai Hou , Xinyu Cong , Shuang Lu

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引用次数: 0

Abstract

This study investigates three treatment methods for removing organic residues and enhancing dyeing sludge (DS) activity: high-temperature calcination, Fenton oxidation, and mechanical grinding. The treated DS was used as a substitute for ground granulated blast slag (GGBS) in producing alkali-activated mortars. A comprehensive characterization of the chemical composition and microstructure of DS was conducted to evaluate the effectiveness of these treatment methods. Results showed that DS contains phosphorus oxides, which, upon dissolution, react with calcium and alkaline ions to form insoluble calcium phosphate and fluorine hydroxyapatite. Subsequently, the mechanical properties, micromorphology, and microstructure of alkali-activated mortars with varying DS contents were analyzed to assess the potential of treated DS as a precursor. Test results revealed that mechanical/heat-activated DS (HDS) experienced minimal strength reduction at 10 % doping, achieving a compressive strength of 99 % compared to the control group. However, controlling the amount of alkali used was crucial, as an increase in alkali resulted in decreased compressive strength. DS treated through mechanical/chemical activation (CDS) also showed promising results, with CDS-9 achieving a compressive strength of 78.4 % of the control group after 56 days of curing. Notably, although the early strength of specimens with CDS was lower, a more significant increase in strength was observed at later stages. Mechanical activation (MDS) had the most adverse effect on strength, independent of the curing duration. The pore size distribution of alkali-activated mortars can be optimized by refining the macro-pores in samples and transforming them into harmless gel pores through HDS and CDS integration. This study offers a feasible strategy for DS activation and demonstrates the highly promising utilization of DS as a precursor for alkali-activated materials.

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用芬顿氧化法和热处理染色污泥替代炉渣制备的碱活性砂浆的微观结构特性

本研究探讨了去除有机残留物和提高染色污泥（DS）活性的三种处理方法：高温煅烧、芬顿氧化和机械研磨。经过处理的染色污泥被用来替代磨细高炉矿渣（GGBS），用于生产碱活性砂浆。对 DS 的化学成分和微观结构进行了全面鉴定，以评估这些处理方法的有效性。结果表明，DS 含有磷氧化物，溶解后会与钙离子和碱性离子反应，形成不溶性磷酸钙和氟羟基磷灰石。随后，分析了不同 DS 含量的碱激活砂浆的机械性能、微观形态和微观结构，以评估经处理的 DS 作为前体的潜力。测试结果表明，机械/热激活 DS（HDS）在掺量为 10% 时强度降低最小，与对照组相比，抗压强度达到 99%。不过，控制碱用量至关重要，因为碱用量增加会导致抗压强度降低。通过机械/化学活化（CDS）处理的 DS 也显示出良好的效果，CDS-9 在固化 56 天后的抗压强度达到对照组的 78.4%。值得注意的是，虽然使用 CDS 的试样早期强度较低，但后期强度有了更显著的提高。机械活化（MDS）对强度的影响最大，与固化时间长短无关。通过 HDS 和 CDS 集成，细化样品中的大孔隙并将其转化为无害的凝胶孔隙，可以优化碱活化砂浆的孔径分布。这项研究为 DS 活化提供了一种可行的策略，并证明了将 DS 用作碱活化材料的前体大有可为。

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来源期刊

Construction and Building Materials 工程技术-材料科学：综合

CiteScore

13.80

自引率

21.60%

发文量

3632

审稿时长

82 days

期刊介绍： Construction and Building Materials offers an international platform for sharing innovative and original research and development in the realm of construction and building materials, along with their practical applications in new projects and repair practices. The journal publishes a diverse array of pioneering research and application papers, detailing laboratory investigations and, to a limited extent, numerical analyses or reports on full-scale projects. Multi-part papers are discouraged. Additionally, Construction and Building Materials features comprehensive case studies and insightful review articles that contribute to new insights in the field. Our focus is on papers related to construction materials, excluding those on structural engineering, geotechnics, and unbound highway layers. Covered materials and technologies encompass cement, concrete reinforcement, bricks and mortars, additives, corrosion technology, ceramics, timber, steel, polymers, glass fibers, recycled materials, bamboo, rammed earth, non-conventional building materials, bituminous materials, and applications in railway materials.