Experimental and analytical studies on shrinkage cracking control in reinforced concrete structures using Shrinkage-Compensating Concrete (SCC)

使用补偿收缩混凝土（SCC）控制钢筋混凝土结构收缩裂缝的实验和分析研究

• 批准号: 550063-2020
• 负责人: Kianoush, Reza
• 金额: $ 1.52万
• 依托单位: Ryerson University
• 依托单位国家: 加拿大
• 项目类别: Alliance Grants
• 财政年份: 2020
• 资助国家: 加拿大
• 起止时间: 2020-01-01 至 2021-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=701263
• 关键词: Experimental; analytical; studies; shrinkage; cracking

Concrete liquid containing structures (CLCS) are primarily used for the storage of water, wastewater and other industrial wastes. These structures are designed and detailed to meet serviceability requirements for crack and leakage control. In such lifeline facilities restrained temperature and shrinkage strains are one of the major reasons for cracking resulting in serviceability problems. The restraint against volumetric changes due to shrinkage or temperature variations is usually caused as a result of attachment to other structural segments which would result in the development of tensile strains. A good understanding of the behaviour of these structures is necessary in order to meet safety and serviceability objectives, while containing construction and maintenance costs. In this study, the use of shrinkage-compensating concrete (SCC) as a potential solution to minimize shrinkage cracking will be studied through several experimental and numerical case studies. The goal is to improve the concrete technology and to provide engineers with practical design guidelines in an effort to introduce a superior design solution. This will lead to a better performance against cracking in the walls of CLCS. The main objective is to investigate if the proper choice of a smart material such as SCC could lead to superior performance in cracking/leakage control in the vulnerable regions of CLCS, as compared to the customary concrete material typically used in today's practice. The study involves testing long structural beams exposed to environmental effects while undergoing thermal and shrinkage movements. A numerical model will also be developed to simulate the experimental program for parametric studies. It is expected that this research will provide a useful framework towards the development of practical design guidelines for CLCS. The study will also provide practical benefit to the Canadian society by providing a safe and leak-tight construction solution vital for minimizing the environmental impacts and thus potential hazards to public safety.

混凝土贮液结构（CLCS）主要用于储存水、废水和其他工业废物。这些结构的设计和详细说明，以满足裂缝和泄漏控制的适用性要求。在这种生命线设施中，受约束的温度和收缩应变是导致使用性能问题的开裂的主要原因之一。对收缩或温度变化引起的体积变化的约束通常是由于与其他结构段的连接而引起的，这将导致拉伸应变的发展。为了满足安全性和适用性目标，同时控制施工和维护成本，有必要对这些结构的行为有很好的了解。在这项研究中，使用收缩补偿混凝土（SCC）作为一个潜在的解决方案，以尽量减少收缩开裂将通过几个实验和数值案例研究。其目的是改进混凝土技术，并为工程师提供实用的设计指南，以引入上级设计解决方案。这将导致更好的性能，防止CLCS壁中的开裂。我们的主要目标是调查，如果一个智能材料，如SCC的正确选择可能会导致上级性能的开裂/泄漏控制在CLCS的脆弱地区，相比，通常使用的混凝土材料在今天的实践。该研究涉及测试长结构梁暴露于环境影响，同时经历热和收缩运动。还将开发一个数值模型来模拟参数研究的实验程序。预计这项研究将为制定大陆架界限委员会的实际设计准则提供一个有用的框架。这项研究还将为加拿大社会提供实际利益，提供一个安全和密封的建筑解决方案，以尽量减少对环境的影响，从而减少对公共安全的潜在危害。