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: 2019
• 资助国家: 加拿大
• 起止时间: 2019-01-01 至 2020-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=691028
• 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.****The overarching objectives are to increase the understanding of deterioration mechanisms in concrete, to develop innovative solutions and tests and use them to promote transformative changes in the industry through adoption of performance tests and specifications that will improve the durability and extend the service life of concrete.******

尽管混凝土技术不断发展，但极端环境下的混凝土仍然会过早恶化。部分原因是在使用新材料时没有充分评估潜在影响，或者使用了不充分的规格或施工方法，但也由于缺乏对影响耐久性的所有因素的了解而导致。水泥浆基体和浆体-集料界面区域的孔隙结构和由此产生的流体渗透阻力决定了混凝土对大多数损坏原因的耐久性。具体来说，研究重点有四个主要领域：（1）更好地表征孔隙结构、流体侵入机制并改进对暴露于氯化物环境的混凝土使用寿命的预测，（2）改进碱硅反应的预测，（3）开发混凝土抵抗不同硫酸盐侵蚀机制的新方法，以及（4）降低早期非结构性的风险 ****首要目标是加深对混凝土劣化机制的了解，开发创新的解决方案和测试，并通过采用性能测试和规范来促进行业的变革，从而提高混凝土的耐久性和延长使用寿命。******