Mechanical and durability properties of hybrid fiber-reinforced phase change concrete: Synergistic mechanisms and performance enhancement

IF 8.9 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Construction and Building Materials Pub Date : 2026-03-21 Epub Date: 2026-02-23 DOI:10.1016/j.conbuildmat.2026.145692

Fang He , Yazhen Sun , Baiquan Fu , Weiyi Tang , Jinchang Wang

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引用次数: 0

Abstract

To address the high brittleness, low tensile strength, and insufficient durability of traditional concrete under environmental variations, this study proposes a novel approach using hybrid fibers and phase change materials (PCM) for composite modification. The mechanical and durability properties of hybrid fiber-reinforced phase change concrete (HFRPCC) were systematically investigated, with microstructure analyzed via SEM and MIP to elucidate the synergistic mechanisms between fibers and PCM. Results indicate that while PCM reduces mechanical properties, the incorporation of hybrid fibers effectively offsets this negative effect. With 4 % PCM (P4CC), the frost resistance was significantly enhanced, showing only 3.43 % mass loss after 200 freeze-thaw cycles. HFRP4CC (with 4 % PCM) exhibited a 38.5 % reduction in mass loss and an 8.3 % increase in relative dynamic elastic modulus compared to hybrid fiber-reinforced concrete (HFRC), demonstrating superior freeze-thaw resistance. Nano-SiO₂ from the PCM carrier refined the pore structure, while hybrid fibers promoted C-S-H gel formation and enhanced interfacial bonding, synergistically mitigating frost damage. The fiber network also restrained PCM-induced pores and optimized pore distribution, reducing penetration depth and relative permeability coefficient by 9.5 % and 25 %, respectively, compared to HFRC. Although PCM slightly increased electrical flux, the porosity-filling and ion-blocking effects of fibers maintained HFRPCC’s impermeability advantages. After 100 thermal cycles, the mechanical properties exhibit a decrease of less than 3 %, demonstrating good stability under phase-change cycling. The developed HFRPCC combines thermal regulation and structural optimization, significantly improving mechanical properties, freeze-thaw resistance, and impermeability, offering a high-performance solution for concrete engineering in extreme environments.

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混杂纤维增强相变混凝土的力学和耐久性：协同机制和性能增强

为了解决传统混凝土在环境变化下的高脆性、低抗拉强度和耐久性不足的问题，本研究提出了一种使用混杂纤维和相变材料（PCM）进行复合改性的新方法。系统研究了混杂纤维增强相变混凝土（HFRPCC）的力学性能和耐久性，并通过SEM和MIP对其微观结构进行了分析，以阐明纤维与相变混凝土的协同作用机制。结果表明，虽然PCM降低了机械性能，但混杂纤维的掺入有效地抵消了这种负面影响。当PCM （P4CC）为4 %时，抗冻性显著增强，200次冻融循环后的质量损失仅为3.43 %。与混合纤维增强混凝土（HFRC）相比，HFRP4CC（含4 % PCM）的质量损失减少38.5% %，相对动态弹性模量增加8.3 %，表现出优异的抗冻融性能。来自PCM载体的纳米sio₂细化了孔隙结构，而混合纤维促进了C-S-H凝胶的形成，增强了界面结合，协同减轻了霜冻损害。光纤网络还抑制了pcm诱导的孔隙，优化了孔隙分布，与HFRC相比，渗透深度和相对渗透系数分别降低了9.5% %和25% %。虽然PCM略微增加了电通量，但纤维的孔隙填充和离子阻断作用保持了HFRPCC的抗渗优势。经过100次热循环后，力学性能下降幅度小于3 %，相变循环稳定性好。开发的HFRPCC结合了热调节和结构优化，显著提高了混凝土的力学性能、抗冻融性能和抗渗性能，为极端环境下的混凝土工程提供了高性能解决方案。

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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.