Study on the superiority of biomass ash composite activation in blast furnace slag-coal gangue-fly ash system: A novel high-strength alkali-activated cementitious material

IF 8 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Construction and Building Materials Pub Date : 2025-10-25 DOI:10.1016/j.conbuildmat.2025.144147

Zhiheng Wang , Bing Wei , Feng Liu , Zhijing Zhu , Feng Yang , Shichao Zhao , Rentai Liu , Chenyang Ma

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引用次数: 0

Abstract

Alkali-activated materials are excellent alternatives to ordinary Portland cement, and their comprehensive performance and environmental impact are closely related to the type of alkali activator. In this study, blast furnace slag (BFS), coal gangue (CG), and fly ash (FA) were used as precursors for alkali-activated materials. Based on macroscopic performance tests and microscopic characterization methods, a comprehensive evaluation was conducted on the activation efficiency and performance advantages/disadvantages of four alkali activators (sodium hydroxide solution, modified sodium silicate solution, biomass ash (BA) solution, and composite alkali activator) in the BFS-CG-FA ternary solid waste system. This study introduced a novel BA composite activation method, which combines modified sodium silicate solution with potassium-rich and calcium-rich BA. The resulting alkali-activated cementitious material exhibited high strength, with a 28d compressive strength of 48.75 MPa. The results showed that, for the BFS-CG-FA system, BA composite activation exhibited excellent activation efficiency both in the early and late stages of the reaction. Moreover, BA more significantly enhanced the activation efficiency of low-concentration sodium silicate solution. The addition of BA not only enabled the material to achieve higher 28d compressive strength but also significantly increased the 1d compressive strength by 66 times (32.21 MPa vs. 0.48 MPa), greatly improving the early strength of the cementitious material. The findings of this study are conducive to promoting the research and development of environmentally friendly alkali activators as well as the popularization and engineering application of high-performance alkali-activated materials.

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生物质灰复合活化在高炉炉渣-煤矸石-粉煤灰体系中的优越性研究——一种新型高强度碱活化胶凝材料

碱活化材料是普通硅酸盐水泥的优良替代品，其综合性能和环境影响与碱激发剂的种类密切相关。以高炉矿渣（BFS）、煤矸石（CG）和粉煤灰（FA）为前驱体制备碱活化材料。通过宏观性能试验和微观表征方法，综合评价了4种碱活化剂（氢氧化钠溶液、改性水玻璃溶液、生物质灰（BA）溶液和复合碱活化剂）在BFS-CG-FA三元固体废物体系中的活化效率和性能优劣。本研究介绍了一种新的BA复合活化方法，将改性硅酸钠溶液与富钾、富钙BA结合。所得碱活化胶凝材料强度高，28d抗压强度为48.75 MPa。结果表明，对于BFS-CG-FA体系，BA复合活化在反应前期和后期均表现出优异的活化效率。此外，BA对低浓度水玻璃溶液的活化效率提高更为显著。BA的加入不仅使材料获得了更高的28d抗压强度，而且使材料的1d抗压强度显著提高了66倍（32.21 MPa vs. 0.48 MPa），大大提高了胶凝材料的早期强度。本研究结果有利于促进环境友好型碱活化剂的研究与开发，以及高性能碱活化材料的推广与工程应用。

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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.