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

被引：2

作者：

Huang, Daguan ^{[1
,2
]}

Wang, Xinzhi ^{[1
]}

Li, Xiufei ^{[1
]}

Su, Li ^{[3
]}

Tian, Jianbo ^{[1
]}

Li, Yang ^{[2
]}

Liu, Yunhe ^{[1
]}

机构：

[1] Xian Univ Technol, Sch Civil Engn & Architecture, Xian 710048, Peoples R China

[2] Xian Univ Technol, State Key Lab Water Engn Ecol & Environm Arid Area, Xian 710048, Peoples R China

[3] Lanzhou Univ Technol, Sch Civil Engn, Lanzhou, Peoples R China

来源：

CONSTRUCTION AND BUILDING MATERIALS | 2025年 / 473卷

基金：

中国国家自然科学基金;

关键词：

Basalt-polyvinyl alcohol hybrid fiber; Coupling effect of sulfate attack and freeze-thaw cycle; Mechanical properties; Pore structure; Deterioration law;

D O I：

10.1016/j.conbuildmat.2025.140949

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

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 sulfatefreeze 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 %.

引用

页数：17

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