Hierarchical pore structure for enhanced carbonation in basic magnesium sulfate cement: Mechanisms from modification to post‑carbonation evolution

IF 10.9 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Cement and Concrete Research Pub Date : 2025-03-17 DOI:10.1016/j.cemconres.2025.107876

Junjie You , Yanrong Zhang , Cheng Yang , Qianyi Song , Yi Sun

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引用次数: 0

Abstract

Basic magnesium sulfate cement (BMSC) contains excess MgO causing volume instability, limiting its applications. Although forced carbonation stabilizes MgO into carbonates, it compromises strength by transforming strength-contributing phases. This study presents a forced carbonation strategy based on hierarchical pore regulation. We constructed a multi-scale pore network from nano to macro scale, optimizing CO₂ diffusion channels and carbonation product deposition space through synergy of basalt fiber and recycled wood fiber. The system exhibits a three-stage mechanism during forced carbonation: pressure-driven dissolution, filling-directed reconstruction, and self-regulating evolution. Under this mechanism, the developed carbonated bio-based magnesium sulfate (CBMS) cement overcame post‑carbonation limitations and exhibited increases of 79.3% and 19.1% in compressive and flexural strength respectively through the synergistic effect of fiber toughening and carbonation filling. The coupling mechanism between hierarchical pore structure evolution and carbonation behavior further achieved a 215.3% increase in carbonation degree and a 59.9% reduction in global warming potential.

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来源期刊

Cement and Concrete Research 工程技术-材料科学：综合

CiteScore

20.90

自引率

12.30%

发文量

318

审稿时长

53 days

期刊介绍： Cement and Concrete Research is dedicated to publishing top-notch research on the materials science and engineering of cement, cement composites, mortars, concrete, and related materials incorporating cement or other mineral binders. The journal prioritizes reporting significant findings in research on the properties and performance of cementitious materials. It also covers novel experimental techniques, the latest analytical and modeling methods, examination and diagnosis of actual cement and concrete structures, and the exploration of potential improvements in materials.