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

在含有液体的混凝土结构中，水密性和耐久性被认为是主要考虑因素。此外，由于恶劣的天气条件，加拿大各地有大量混凝土储罐随着时间的推移而恶化，迫切需要一个高效、经济、同时又实用的修复解决方案。该行业现在面临的问题是，如何缓解失控的裂缝现象及其破坏性后果，如渗漏，以努力生产耐用、耐用的混凝土。多年来，混凝土设计师、承包商和预拌公司一直在试验各种控制裂缝/渗漏的方法，但每种方法都取得了很小的成功。此外，回顾现有的文献，可以说在这一领域所做的努力很少。这里主要关注的是含有液体的结构，如用于自来水和废水处理厂的矩形水箱。自愈性ECC材料可以被认为是解决这一问题的有效方法。该材料既可用于裂缝/泄漏控制，也可用于补丁修复。这一问题将在本研究中使用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。作为其他可能的修复方案，裂缝环氧喷淋和玻璃钢缠绕的适用性也将在本项目期间进行实验研究。这一主题在混凝土液体容器中尤其重要，在这些容器中，开裂会降低结构的完整性，可能会导致与泄漏相关的劣化和适用性问题。人们相信，通过新开发的材料来开发一种方法来解决这一具体问题，将有助于该行业实施更经济和有效的解决方案，以取代目前通常在实践中使用的惯用技术。

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.