基于PVA纤维和CA纤维协同作用增强海洋环境中三元修补砂浆的自修复能力

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

Construction and Building Materials Pub Date : 2025-05-13 DOI:10.1016/j.conbuildmat.2025.141744

Mengdie Niu , Yaxin Wang , Xiang He , Donghui Miao , Guoxin Li

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引用次数: 0

摘要

微裂纹的存在加速了海水中腐蚀离子向胶凝修复材料内部的扩散，从而加速了修复体系性能的退化。因此，提高修补材料的裂缝自愈能力，对于延长海洋环境下混凝土修补工程的使用寿命具有重要意义。本研究探讨了聚乙烯醇（PVA）纤维和结晶外加剂（CA）协同引入对普通硅酸盐水泥-硫铝酸盐水泥-磨粒高炉矿渣三元修复材料自愈性能的影响。在不同预裂时间（7d和56d）和不同养护条件（水和海水）下，对试件的自愈程度进行了评价。最后，结合产物的组成和微观结构分析，揭示了PVA纤维与CA的配位机理。结果表明，PVA纤维和CA纤维的同时掺入可以减弱纤维对三元修复材料抗压强度的负面影响，有利于力学性能的发展。同时提高了预裂试样的裂纹愈合率、抗压强度恢复率和波速恢复率。晚期裂纹的愈合速率低于早期裂纹的愈合速率。模拟海水有助于修补砂浆裂缝的愈合，因为海水中的离子促进了CA的络合沉淀反应，产生了更多的愈合产物来密封裂缝。PVA纤维抑制了裂纹的扩展，为CA愈合产物的沉积提供了附着点，增加了愈合产物的沉积和利用，从而进一步增强了微裂纹的自愈能力。模拟海水中的主要愈合产物为C-S-H、Mg(OH)2、CaCO3、Ca(OH)2、AFt和Friedel's盐。

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Enhancing the self-healing capability of ternary repair mortar in marine environment based on the synergistic use of PVA fibers and CA

The existence of microcracks accelerates the diffusion of corrosive ions in seawater to the interior of cementitious repair materials, thereby accelerating the performance degradation of the repair system. Hence, it is a vital significance to promote the crack self-healing ability of repair materials for extending the service duration of concrete repair projects in marine environment. In this research, the influence of the coordinated introduction of polyvinyl alcohol (PVA) fibers and crystalline admixture (CA) on the self-healing properties of ordinary Portland cement-sulfoaluminate cement-ground granulated blast furnace slag ternary repair materials was explored. The self-healing degree of the specimens was evaluated under different pre-cracking time (7d and 56d) and different curing conditions (water and seawater). Finally, combined with the analysis of the compositions and microstructure of the products healed, the coordinative mechanism of PVA fibers and CA was revealed. The results indicated that the simultaneous incorporation of PVA fibers and CA attenuated the negative influence of fibers on the compressive strength of the ternary repair material, which was beneficial for the development of mechanical properties. Meanwhile, the crack healing rate, compressive strength recovery rate and wave velocity recovery rate of pre-cracking specimens were improved. Furthermore, the healing rates of late crack were lower than that of early crack. Simulated seawater contributed to heal the cracks in the repair mortar, because the ions in seawater promoted the complexation precipitation reaction of CA and generated more healing products to seal the cracks. PVA fibers suppressed the extension of cracks, provided the attachment points for the deposition of the healing products of CA, and increased the deposition and utilization of healing products, thus further enhancing the self-healing ability of the microcracks. The predominant healing products in simulated seawater were C-S-H, Mg(OH)₂, CaCO₃, Ca(OH)₂, AFt and Friedel's salt.

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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.