Durability of Concrete

混凝土的耐久性

• 批准号: RGPIN-2017-06235
• 负责人: Hooton, Robert
• 金额: $ 4.44万
• 依托单位: University of Toronto
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2017
• 资助国家: 加拿大
• 起止时间: 2017-01-01 至 2018-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=636138
• 关键词: Durability; Concrete

In spite of developments in concrete technology, concrete in extreme environments continues to prematurely deteriorate. In part this results from utilization of new materials without adequate evaluation of potential impacts, or from use of inadequate specifications or construction methods, but it also results from a lack of understanding of all the factors which influence durability. The pore structure and resultant fluid penetration resistance of the cement paste matrix and paste-aggregate interfacial regions govern the durability of concrete to most causes of distress. Specifically, there are four main areas of research focus: (1) better characterization of pore structure, fluid ingress mechanisms and improving prediction of service life of concretes exposed to chloride environments, (2) improving the prediction of alkali-silica reaction, (3) developing new methodologies for concrete’s resistance to different sulfate attack mechanisms, and (4) reducing the risk of early-age non-structural cracking.

尽管混凝土技术取得了发展，但极端环境下的混凝土继续过早退化。这部分是由于使用新材料时没有充分评估潜在的影响，或者是因为使用了不适当的规格或施工方法，但也是因为缺乏对影响耐久性的所有因素的了解。水泥浆体基质和浆体-骨料界面区域的孔结构和由此产生的抗流体渗透能力决定了混凝土对大多数破坏原因的耐久性。具体地说，主要有四个方面的研究重点：(1)更好地表征混凝土在氯离子环境中的孔结构、流体进入机理和改进混凝土使用寿命的预测；(2)改进碱-硅酸反应的预测；(3)开发混凝土抵抗不同硫酸盐侵蚀机制的新方法；(4)降低早期非结构性裂缝的风险。