Investigations on aggregate reactions and the development of damage in concrete

混凝土骨料反应和损伤发展的研究

• 批准号: 350903-2008
• 负责人: Fournier, Benoit
• 金额: $ 1.7万
• 依托单位: Université Laval
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2012
• 资助国家: 加拿大
• 起止时间: 2012-01-01 至 2013-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=505097
• 关键词: Investigations; aggregate; reactions; development; damage

The growing use of a performance approach in concrete construction has increased the pressure to develop better tools for quickly and reliably evaluating the quality of concrete-making materials. Recent research has shown that many aggregates respond differently in "performance" tests compared to natural exposure conditions, sometimes resulting in poor quality aggregate materials being used at risk in concrete construction, or in good-quality aggregates being rejected. The objective of the research program is to improve our understanding of the influence of the compositional/physical properties of natural and recycled aggregates on their behaviour as concrete-making materials, either under "accelerated" laboratory conditions or when subjected to natural environment. Furthermore, the research program proposes to study how the reaction and expansion processes in different types of reactive coarse and fine aggregates, as well as through other deleterious processes, impact on the development of distress/damage in concrete. This will not only contribute to a better understanding of the mechanisms responsible for the degradation of concrete, but it should in turn contribute to a more reliable prediction and modeling of the performance of concrete infrastructure. Finally, as sources of good quality materials in the vicinity of large urban areas are depleting rapidly, which will likely increase the pressure for using marginal natural aggregates or recycled materials in concrete construction, a better understanding of how the properties of concrete-making materials influence the performance of the final product (concrete) and how it could reliably be evaluated through performance testing, is critical in a proper management scheme of our natural resources.

在混凝土施工中越来越多地使用性能方法，这增加了开发更好的工具来快速和可靠地评估混凝土制造材料质量的压力。最近的研究表明，与自然暴露条件相比，许多骨料在“性能”测试中的反应不同，有时会导致在混凝土施工中使用劣质骨料存在风险，或者在优质骨料中拒绝使用。该研究计划的目的是提高我们对天然骨料和再生骨料的组成/物理性质对其作为混凝土制造材料的性能的影响的理解，无论是在加速的实验室条件下还是在自然环境中。此外，该研究计划建议研究不同类型的活性粗集料和细集料中的反应和膨胀过程以及通过其他有害过程对混凝土中的损伤/损害发展的影响。这不仅有助于更好地了解造成混凝土退化的机制，而且反过来也有助于对混凝土基础设施的性能进行更可靠的预测和建模。最后，由于大城市附近优质材料的来源正在迅速枯竭，这可能会增加在混凝土建筑中使用边际天然骨料或回收材料的压力，更好地了解混凝土制造材料的性能如何影响最终产品(混凝土)的性能，以及如何通过性能测试对其进行可靠评估，对于我们的自然资源的适当管理方案至关重要。