An Innovative Sludge-derived Capsule for Self-healing Cementitious Materials

IF 9.7 1区环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL

Journal of Cleaner Production Pub Date : 2024-10-30 DOI:10.1016/j.jclepro.2024.144120

Hossein Sanaei Ataabadi, Yue Liu, Jun Ma, Jun-Jie Zeng, Guangtong Huang, Yan Zhuge

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Abstract

An innovative eco-efficient capsule utilising drinking water treatment sludge (DWTS) as a healing agent for concrete crack sealing was developed. In this study, the core materials were mix of DWTS and calcium hydroxide granulated by poly (ethylene glycol). A non-toxic polymer, Ethyl cellulose (EC), is applied as the protective shell material. The morphology, internal structure, and leakage mechanism of capsules, self-healing performance of cracked mortars and resulting healing products were assessed. Obtained results indicated that EC uniformly covered the spherical core material after designed coating procedures. The main elements released from the capsules were Ca, Al and Si after dissolution of polyethylene glycol (PEG), which would contribute to pozzolanic reactions inside the matrix. Cracks with an initial width of 400 μm were completely healed after 7 days of curing. Such a healing process also led to an 73% enhancement in compressive strength at a healing age of 28 days. The water tightness of capsule-based samples improved by more than 90% in the first 7 days, compared to just 10% in control samples. The predominant healing products were calcium carbonate in the form of calcite, and some content of aluminium-bearing phases derived from the pozzolanic reaction of DWTS.

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用于自愈合水泥基材料的创新性污泥衍生胶囊

利用饮用水处理污泥（DWTS）作为混凝土裂缝密封的愈合剂，开发了一种创新的生态高效胶囊。在这项研究中，核心材料是 DWTS 和氢氧化钙的混合物，由聚（乙二醇）造粒而成。无毒聚合物乙基纤维素（EC）被用作保护壳材料。对胶囊的形态、内部结构、渗漏机制、裂缝砂浆的自愈合性能以及由此产生的愈合产品进行了评估。结果表明，经过设计的涂层程序后，EC 能够均匀地覆盖球形芯材。聚乙二醇（PEG）溶解后，从胶囊中释放出的主要元素是钙、铝和硅，这些元素将促进基质内部的热灰化反应。初始宽度为 400 μm 的裂缝在固化 7 天后完全愈合。这种愈合过程还使 28 天愈合龄期的抗压强度提高了 73%。胶囊样品的水密性在头 7 天内提高了 90% 以上，而对照样品仅提高了 10%。主要的愈合产物是方解石形式的碳酸钙，以及一些由 DWTS 的胶凝反应产生的含铝相。

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来源期刊

Journal of Cleaner Production 环境科学-工程：环境

CiteScore

20.40

自引率

9.00%

发文量

4720

审稿时长

111 days

期刊介绍： The Journal of Cleaner Production is an international, transdisciplinary journal that addresses and discusses theoretical and practical Cleaner Production, Environmental, and Sustainability issues. It aims to help societies become more sustainable by focusing on the concept of 'Cleaner Production', which aims at preventing waste production and increasing efficiencies in energy, water, resources, and human capital use. The journal serves as a platform for corporations, governments, education institutions, regions, and societies to engage in discussions and research related to Cleaner Production, environmental, and sustainability practices.