Biomimetic anisotropic hydrogel as a smart self-healing agent of sustainable cement-based infrastructure

IF 10.8 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Cement & concrete composites Pub Date : 2024-09-17 DOI:10.1016/j.cemconcomp.2024.105763

Ming Liu , Miaomiao Hu , Shuang Zou , Haichuan Lu , Jiayu Yu , Jintang Guo

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Abstract

The durability improvement of cement-based infrastructure is an effective strategy to achieve sustainable development and reduce the carbon footprint. In this work, a biomimetic anisotropic hydrogel, alginate/polyacrylamide/halloysite nanotubes hybrid hydrogel (SA/AM/HNTs-RDC), was fabricated as a self-healing agent to enhance the self-healing ability and extend the service life of cement-based infrastructure. The effects of SA/AM/HNTs-RDC hydrogel on the formation and deposition of healing products and the self-healing behavior of cement in the different conditions (water condition and CO₂-rich condition) were investigated. Compared with the matrix hydrogel (alginate/polyacrylamide, SA/AM), the crosslinking ions and anisotropic microstructure of SA/AM/HNTs-RDC hydrogel can stimulate the massive formation and dense deposition of healing products (ettringite (AFt) and monosulfo aluminate (AFm) in the simulated water condition, calcite and AFt in CO₂-rich condition) to accelerate the performance recovery of the damaged construction. The self-healing measurements exhibited that the cracks around 200 μm in the cement paste with 1 % anisotropic hydrogel (RDC1) can be sealed completely after 14-day-curing in water, and its recovery ratio of the compressive strength increased by about 10 % compared with control samples. In CO₂-rich condition, the closure rate of cracks was accelerated and the complete healing of cracks with similar width only needed 7 days. The compressive strength recovery increased by 13.7 % over control samples.

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仿生各向异性水凝胶作为可持续水泥基基础设施的智能自愈合剂

提高水泥基基础设施的耐久性是实现可持续发展和减少碳足迹的有效战略。本研究制备了一种仿生物各向异性水凝胶--藻酸盐/聚丙烯酰胺/海泡石纳米管杂化水凝胶（SA/AM/HNTs-RDC）作为自愈合剂，以增强水泥基基础设施的自愈合能力并延长其使用寿命。研究了 SA/AM/HNTs-RDC 水凝胶在不同条件（水条件和富含二氧化碳的条件）下对愈合产物的形成和沉积以及水泥自愈合行为的影响。与基质水凝胶（藻酸盐/聚丙烯酰胺，SA/AM）相比，SA/AM/HNTs-RDC 水凝胶的交联离子和各向异性的微观结构可刺激愈合产物（在模拟水条件下为乙长石（AFt）和单磺铝酸盐（AFm），在富二氧化碳条件下为方解石和 AFt）的大量形成和密集沉积，从而加速受损建筑的性能恢复。自愈合测量结果表明，含有 1% 各向异性水凝胶的水泥浆（RDC1）在水中固化 14 天后，200 μm 左右的裂缝可以完全封闭，其抗压强度恢复率比对照样品提高了约 10%。在富含二氧化碳的条件下，裂缝的闭合速度加快，宽度相似的裂缝只需 7 天就能完全愈合。抗压强度恢复比对照样品提高了 13.7%。

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来源期刊

Cement & concrete composites 工程技术-材料科学：复合

CiteScore

18.70

自引率

11.40%

发文量

459

审稿时长

65 days

期刊介绍： Cement & concrete composites focuses on advancements in cement-concrete composite technology and the production, use, and performance of cement-based construction materials. It covers a wide range of materials, including fiber-reinforced composites, polymer composites, ferrocement, and those incorporating special aggregates or waste materials. Major themes include microstructure, material properties, testing, durability, mechanics, modeling, design, fabrication, and practical applications. The journal welcomes papers on structural behavior, field studies, repair and maintenance, serviceability, and sustainability. It aims to enhance understanding, provide a platform for unconventional materials, promote low-cost energy-saving materials, and bridge the gap between materials science, engineering, and construction. Special issues on emerging topics are also published to encourage collaboration between materials scientists, engineers, designers, and fabricators.