Comparison of the behavior of PVA-ECC and normal concrete material in crack and leakage control in liquid containing structures

PVA-ECC 与普通混凝土材料在含液结构裂缝和渗漏控制方面的性能比较

• 批准号: 516268-2017
• 负责人: Lachemi, Mohamed
• 金额: $ 1.82万
• 依托单位: Ryerson University
• 依托单位国家: 加拿大
• 项目类别: Engage Grants Program
• 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=639833
• 关键词: Comparison; behavior; PVA; ECC; normal

One of the key issues in the design of concrete liquid containing structures (CLCS) is their crackingcharacteristics and its relation to the liquid leakage. A consistent knowledge on this matter is essential to ensureif the serviceability requirements are met. The previous research conducted in this area is very limited. Most ofthe available literature is focused on the leakage behavior of typical beam sections made of normal concreteunder simple static loading. The lack of empirical data on the permeability behavior of slab or wall sectionsmade of smart material under combinations of loadings is felt in the literature. This study intends to addressthis issue both analytically, using the non-linear finite element (FE) analysis and experimentally, measuring theleakage rate in the loaded specimens under pressurized water as a function of the crack conditions and time.The issue is of particular significance for CLCS used in lifeline facility capacities such as in municipal watersupply, sewage treatment, firefighting, nuclear industry, etc. In such applications, due to functionality reasons,crack and leakage control is the main concern and an uncontrolled cracking could lead to irreparableconsequences. The major issue to be emphasized in this research is the development of cracks leading touncontrollable leakage in the vulnerable regions of the containment walls due to different loading applicationsincluding seismic. Current design codes do not address this issue adequately and it is left to design engineers toconservatively consider it in their design, thus necessitating a more detailed and focused investigation. Themain objective of this research is to assess and compare the performance of self-healing ECC (EngineeredCementitious Composites) and normal concrete material in controlling the crack/leakage in CLCS in an effortto achieve the most desired water tightness characteristics in this type of structures. In this relation, it isproposed that various loading types and stress combinations be induced in specimens representing a reinforcedcontainer wall and their water-tightness behavior be examined then.

混凝土液体含有结构（CLC）设计的关键问题之一是它们的裂纹形料及其与液体泄漏的关系。关于此问题的一致知识对于确保满足可维修性要求至关重要。以前在该领域进行的研究非常有限。大多数可用的文献都集中在正常混凝土制成的简单静态载荷制成的典型束截面的泄漏行为上。在文献中，人们感觉到了关于智能材料的平板或墙壁切片的渗透率行为的经验数据。这项研究旨在使用非线性有限元（FE）分析和实验性地解决这一问题，并在加压水下的裂纹条件下测量已加载标本的theakage率，这是裂纹条件和时间的函数。在此类应用中，由于功能性原因，裂缝和泄漏控制是主要的关注，不受控制的裂纹可能导致无效的人，在此类应用中，在此类应用中使用的CLC（例如在市政水上供应，污水处理，消防，核工业等）中使用的CLC。在这项研究中要强调的主要问题是开发裂缝，导致围墙易受伤害区域的可控制泄漏，包括不同的负载应用，包括地震。当前的设计代码不能充分解决此问题，并且要在其设计中考虑设计工程师，因此需要进行更详细且重点的调查。这项研究的目标是评估和比较自我修复ECC（工程执行复合材料）和正常混凝土材料的性能，以控制CLC中CLC中的裂纹/泄漏，以实现这种类型的结构中最需要的水紧密性特征。在这种关系中，可以在代表增强壁壁的样品中诱导各种负载类型和应力组合，然后检查其水紧身行为。