Study of natural self-healing of hydraulic concrete damaged by up to 200 freeze-thaw cycles

IF 6.2 2区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Developments in the Built Environment Pub Date : 2024-04-01 DOI:10.1016/j.dibe.2024.100470

Zepeng Li, Yaoying Huang, Weitian Cui, Yuchen Fu, Haidong Wei, Jin Yu

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Abstract

To investigate the recovery effect of natural self-healing of freeze-thaw damage of cementitious material-poor hydraulic concrete, we carried out a natural self-healing test for hydraulic concrete damaged by up to 200 rapid freeze-thaw cycles. The self-healing effect of macro-mechanical properties of hydraulic concrete damaged by freeze-thaw cycles was quantitatively characterized by the recovery rate of the specimens which underwent different numbers of freeze-thaw cycles then continued the standard curing to 28 days. Next, the microscopic properties of damaged hydraulic concrete after self-healing were further investigated by combining XRD, SEM and nitrogen adsorption tests. Finally, a prediction model of the recovery rate of macro-mechanical properties was established by using the microscopic pore test results. The results showed that, when the hydraulic concrete undergoes the damage of different freeze-thaw cycles and continues to standard curing for 28 days, the concrete specimens manifest natural self-healing to some extent even if damaged by up to 200 freeze-thaw cycles.

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经 200 次冻融循环破坏的水工混凝土的自然自愈研究

为了研究贫水泥基材料水工混凝土冻融破坏的自然自愈恢复效果，我们对经过多达 200 次快速冻融循环破坏的水工混凝土进行了自然自愈试验。通过对经历不同冻融循环次数后继续标准养护至 28 天的试件的恢复率，对冻融循环破坏的水工混凝土宏观力学性能的自愈合效果进行了定量表征。接着，结合 XRD、SEM 和氮吸附试验，进一步研究了自愈后受损水工混凝土的微观特性。最后，利用微观孔隙测试结果建立了宏观力学性能恢复率预测模型。结果表明，当水工混凝土经历了不同冻融循环的破坏并继续标准养护 28 天后，即使混凝土试件受到多达 200 次冻融循环的破坏，也会在一定程度上表现出自然自愈。

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来源期刊

Developments in the Built Environment Multiple-

CiteScore

7.40

自引率

1.20%

发文量

审稿时长

22 days

期刊介绍： Developments in the Built Environment (DIBE) is a recently established peer-reviewed gold open access journal, ensuring that all accepted articles are permanently and freely accessible. Focused on civil engineering and the built environment, DIBE publishes original papers and short communications. Encompassing topics such as construction materials and building sustainability, the journal adopts a holistic approach with the aim of benefiting the community.