The effect of nano-SiO2 on the mechanical properties and degradation of steel fiber-reinforced geopolymer composite material under freeze-thaw cycles

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

Construction and Building Materials Pub Date : 2025-04-11 DOI:10.1016/j.conbuildmat.2025.141198

Yali Hu , Zhangli Wang , Shuai Zong , Daopei Zhu

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引用次数: 0

Abstract

As a byproduct of the metallurgical process, blast furnace slag (BFS) has unique hydraulic and cementitious properties. In this study, BFS, fly ash (FA), and waste lithium slag (LS) were activated by alkaline activators to prepare a novel Blast Furnace Slag-Based Geopolymer Composite (BFSBGC). To enhance its mechanical properties and durability, nano-silica (0–2.5 wt% by mass) and steel fibers (0–1.25 vol% by volume) were introduced as synergistic modifiers, focusing on the material’s freeze-thaw resistance. The specimens underwent 275 freeze-thaw cycles (-45 °C to +22 °C), followed by tests on their mechanical properties and degradation. The results indicate that the incorporation of nano-silica and steel fibers significantly optimized the pore structure and interface bonding, maintaining high mechanical strength (28-day compressive strength of 63.74 MPa, flexural strength of 9.46 MPa) and microstructural density (mass loss <1 %) after severe freeze-thaw cycles. While no traditional aggregates were used in this study to focus on matrix modification, BFSBGC outperforms conventional cement-based materials. This is the first study to introduce nano-silica and steel fibers synergistically into BFSBGC, revealing their mechanism of pore and crack control under extreme freeze-thaw conditions, offering a new strategy for developing green building materials in cold regions.

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冻融循环下纳米sio2对钢纤维增强地聚合物复合材料力学性能及降解的影响

作为冶金过程的副产物，高炉矿渣具有独特的水力和胶凝性能。本研究以高炉矿渣、粉煤灰（FA）和废锂渣（LS）为活化剂，制备新型高炉矿渣基地聚合物复合材料（BFSBGC）。为了提高材料的力学性能和耐久性，引入纳米二氧化硅（0-2.5 wt% by mass）和钢纤维（0-1.25 vol% by volume）作为增效改性剂，重点提高材料的抗冻融性能。试件经历了275次冻融循环（-45 °C至+22 °C），随后进行了力学性能和降解测试。结果表明，纳米二氧化硅和钢纤维的掺入显著优化了孔隙结构和界面结合，在剧烈冻融循环后保持了较高的机械强度（28天抗压强度为63.74 MPa，抗弯强度为9.46 MPa）和微观结构密度（质量损失& 1 %）。虽然在本研究中没有使用传统骨料来关注基体改性，但BFSBGC优于传统水泥基材料。本研究首次将纳米二氧化硅和钢纤维协同引入BFSBGC，揭示了它们在极端冻融条件下的孔隙和裂缝控制机制，为寒区绿色建材的发展提供了新的策略。

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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.