Stability of fresh concrete and its effect on late-age durability of reinforced concrete: An overview
Stability of fresh concrete and its effect on late-age durability of reinforced concrete: An overview
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DOI：
10.1016/j.jobe.2023.107701
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发表时间：
2023-09
影响因子：
6.4
通讯作者：
Yuxin Cai;Qing-feng Liu
中科院分区：
文献类型：
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作者：
Yuxin Cai;Qing-feng Liu
为保证建筑工程质量，在要求新拌混凝土具有高流动性的同时，应适当考虑新拌混凝土的稳定性。新态稳定性差不利于钢筋混凝土结构的后期耐久性，但这一问题尚未引起足够的重视。本文综述了新拌混凝土稳定性及其对钢筋混凝土后期耐久性影响的相关研究。本文首先对新拌混凝土的稳定性机理进行了阐述和分析，然后详细介绍了目前常用的和新近发展起来的新拌混凝土稳定性评价方法。在此基础上，综合讨论了粗集料、矿物掺合料等原材料性能、水胶比、减水剂掺量等配合比设计参数以及现场施工因素对稳定性的影响。最后，系统阐述了保护层渗透性、钢筋与混凝土界面缺陷、钢筋锈蚀开始时间对新拌混凝土稳定性的影响。
The stability of fresh concrete should be properly considered to ensure the quality of building engineering while requiring its high flowability. The poor fresh state stability is detrimental to the durability of reinforced concrete structures in the later period, but this issue has not yet received sufficient attention. This paper presents an overview of relevant studies on the stability of fresh concrete and its effect on the late-age durability of reinforced concrete. Firstly, the mechanism of the stability of fresh concrete is described and analysed, and then the commonly used and recently developed methods for evaluating stability are introduced in detail. After that, the effects of the properties of raw materials such as coarse aggregates and mineral admixtures, the mix design parameters including the water-to-binder ratio and water-reducing agent dosage, and the on-site construction factors on stability are comprehensively discussed. Finally, the influence of the stability of fresh concrete on the permeability of concrete cover, the interface defect between steel bars and concrete, and the initiation time of reinforcement corrosion is also systematically elaborated.