Research on the mechanical properties and pore structure deterioration of Basalt-polyvinyl alcohol hybrid fiber concrete under the coupling effects of sulfate attack and freeze-thaw cycles

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

Construction and Building Materials Pub Date : 2025-03-27 DOI:10.1016/j.conbuildmat.2025.140949

Daguan Huang , Xinzhi Wang , Xiufei Li , Li Su , Jianbo Tian , Yang Li , Yunhe Liu

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Abstract

The mechanical properties and pore structure degradation of basalt-polyvinyl alcohol hybrid fiber concrete (BPHFC) under the coupling effects of sulfate attack and freeze-thaw cycles were investigated. Nine sets of concrete specimens were designed to systematically analyze the effects of fiber content, water-binder ratio, and admixture on the corrosion resistance of the concrete. The results showed that the compressive strength and relative dynamic elastic modulus of BPHFC increase first and then decrease with increase of the number of sulfate-freeze cycles, while the mass loss rate exhibited an opposite trend. Nuclear magnetic resonance (NMR) test indicated that as the sulfate-freeze cycle progresses, the number of small-aperture pores inside the concrete gradually decreases, while the number of large-aperture pores gradually increase and become connected. Calculations based on fractal theory showed that the pore fractal dimension decreased with the increase of sulfate-freeze cycles, indicating that the deterioration of pore structure intensifies and the complexity decreases. Moreover, the fractal dimension demonstrated a strong correlation with compressive strength, relative dynamic modulus, and porosity. The pore shape coefficient increased with the increase of sulfate-freeze cycles, while the tortuosity displayed the opposite trend. The incorporation of fibers effectively reduced the pore shape coefficient. Microscopic test revealed that the hybrid basalt fiber (BF) and polyvinyl alcohol fiber (PVA) can effectively improve the pore structure of concrete, and enhance its resistance to sulfate-freeze cycle damage by dissipating energy and limiting crack propagation during freeze-thaw cycles. Therefore, the addition of BF and PVA can significantly improve the sulfate-freeze resistance of concrete. The synergistic effect of the hybrid BF and PVA was superior to that of a single fiber, and the performance improvement is most significant when the content of BF is 0.3 % and the content of PVA is 0.2 %.

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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.