Experimental and numerical studies on the leakage and patch repair performance of concrete liquid containing structures

在混凝土含液结构中，水密性和耐久性被认为是主要关注的问题。此外，由于恶劣的天气条件，加拿大各地有大量的混凝土储罐随着时间的推移而恶化，迫切需要一种高效、经济、实用的维修解决方案。现在该行业面临的问题是如何减轻不受控制的开裂现象及其破坏性后果，如泄漏，以生产耐用，持久的混凝土。多年来，混凝土设计师、承包商和预拌公司已经试验了各种控制裂缝/渗漏的方法，每种方法都取得了很小程度的成功。此外，回顾现有的文献，可以说，在这一领域做了很少的努力。这里的主要关注点与液体容纳结构有关，例如用于水和废水处理厂的矩形罐。自修复ECC材料可以被认为是解决该问题的有效方案。该材料可用于裂缝/泄漏控制以及修补目的。这个问题将在本研究中使用的实验研究，以及使用非线性有限元（FE）方法的数值分析来解决。裂缝环氧树脂注入和GFRP包裹作为其他可能的修复解决方案的适用性，预计也将在本项目期间进行实验研究。该主题在混凝土液体容器中尤其重要，其中开裂会降低结构的完整性，会导致与泄漏相关的劣化和可使用性问题。据信，通过新开发的材料来开发解决该特定问题的方法将有助于该行业实施更经济和有效的解决方案，以替代目前在实践中通常使用的当前常规技术。

In concrete liquid containing structures, water tightness and durability are considered as major concerns. In addition, there are a large number of concrete tanks across Canada deteriorated over time due to intense weather condition which are in urgent need of an efficient, cost-effective and at the same time practical repair solution. The question that now faces the industry is how to mitigate the uncontrolled cracking phenomenon and its damaging consequences such as leakage in an effort to produce durable, long lasting concrete. For many years, concrete designers, contractors, and ready mix companies have experimented with various means of controlling cracking/leakage which have each met with small degrees of success. Also, reviewing the available literature, one can say that little effort has been done in this field. The main concern here is related to liquid containing structures such as rectangular tanks for water and wastewater treatment plants. Self-healing ECC material may be considered as an efficient solution to the problem. The material can be used for both cracking/leakage control as well as patch repairing purposes. This issue will be addressed in this study both using an experimental study as well as numerical analysis using the non-linear finite element (FE) method. The applicability of crack epoxy injection and GFRP wrapping as other possible repair solutions is also expected to be investigated experimentally during this project. The subject is especially important in concrete liquid containers in which cracking can reduce the structure's integrity, can cause deterioration and serviceability problems associated with leakage. It is believed that developing a methodology by means of newly developed materials to solve this specific problem will help the industry to implement a more economical and effective solution as a replacement to the current customary techniques typically used in practice today.