Evaluation of self-healing in reactive powder concrete with urea-formaldehyde/epoxy microcapsules

IF 1.8 4区工程技术 Q3 CONSTRUCTION & BUILDING TECHNOLOGY Magazine of Concrete Research Pub Date : 2024-08-10 DOI:10.1680/jmacr.23.00302

H. Khosravi, Effat Mehrazin, M. Lezgy-Nazargah

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Abstract

The use of microcapsules as a preservative agent for healing materials has led to a great revolution in the repair of materials. Microcapsules have been used in medicine, agriculture, metallurgy, and mechanics. In civil engineering applications, microcapsules are usually used for the self-healing of concrete, asphalt and cementitious materials. Concrete and cement are widely used in civil engineering and they are distinguished as the predominant construction materials worldwide. The objective of this study is to design and produce urea-formaldehyde microcapsules for the recovery of reactive powder concrete (RPC). The obtained results demonstrated that the RPC specimens containing microcapsules exhibit different behaviors, compared to RPC specimens without microcapsules. For all RPC specimens containing microcapsule, measured values of strengths were lower than specimens without microcapsules. The minimum reduction in the compressive strength was observed in specimens with microcapsules content ranging from 4% to 6% by cement weight. The healing ratio of the compressive strength increased by increasing the weight percentage of microcapsules. Scanning electron microscope (SEM) imaging and energy dispersive spectroscopy (EDS) analysis were used to observe the process of crack healing. The SEM/EDS results showed that cracks are filled by healing products.

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评估含有脲醛/环氧微胶囊的活性粉末混凝土的自愈合能力

使用微胶囊作为愈合材料的防腐剂，为材料的修复带来了一场巨大的革命。微胶囊已被用于医药、农业、冶金和机械领域。在土木工程应用中，微胶囊通常用于混凝土、沥青和水泥基材料的自修复。混凝土和水泥在土木工程中应用广泛，是世界上最主要的建筑材料。本研究的目的是设计和生产用于回收活性粉末混凝土（RPC）的脲醛微胶囊。研究结果表明，与不含微胶囊的 RPC 试样相比，含微胶囊的 RPC 试样表现出不同的行为。对于所有含有微胶囊的 RPC 试样，测得的强度值都低于不含微胶囊的试样。在微胶囊含量为水泥重量的 4% 至 6% 的试样中，抗压强度的降低幅度最小。抗压强度的愈合率随着微胶囊重量百分比的增加而增加。扫描电子显微镜（SEM）成像和能量色散光谱（EDS）分析用于观察裂缝愈合的过程。扫描电子显微镜/能量色散光谱分析结果表明，裂纹被愈合产物填充。

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来源期刊

Magazine of Concrete Research 工程技术-材料科学：综合

CiteScore

4.60

自引率

11.10%

发文量

102

审稿时长

5 months

期刊介绍： For concrete and other cementitious derivatives to be developed further, we need to understand the use of alternative hydraulically active materials used in combination with plain Portland Cement, sustainability and durability issues. Both fundamental and best practice issues need to be addressed. Magazine of Concrete Research covers every aspect of concrete manufacture and behaviour from performance and evaluation of constituent materials to mix design, testing, durability, structural analysis and composite construction.