Improving the performance of ground-supported slabs subjected to extreme environmental conditions using rigid high strength fiberglass geogrids

使用刚性高强度玻璃纤维土工格栅提高地面支撑板在极端环境条件下的性能

• 批准号: 561768-2021
• 负责人: Meguid, MohamedMA
• 金额: $ 1.89万
• 依托单位: McGill University
• 依托单位国家: 加拿大
• 项目类别: Alliance Grants
• 财政年份: 2022
• 资助国家: 加拿大
• 起止时间: 2022-01-01 至 2023-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=749490
• 关键词: Improving; performance; ground; supported; slabs

A problem of growing concern is the fast deterioration of structural elements placed directly on the ground and subjected to harsh outdoor environmental conditions. For example, sidewalks are typically made out of concrete slabs that are usually exposed to extreme weather and corrosive conditions (e.g. de-icing salts in winter). There are about 100,000 km of sidewalks in Canada with about 20 percent in need of replacement in a given year at an estimated cost of more than $1 billion. Municipal financial resources are limited and there are insufficient funds to keep pace with the deteriorating infrastructure. The standard practice is to build most concrete sidewalks using unreinforced or nominally steel-reinforced for crack-width control. However, the presence of chemicals containing chlorides, found in de-icing salt, ocean water, marine air, etc., can attack the bonds that hold concrete together and contribute to steel corrosion. Attempts have been made in the past to use conventional polymeric geogrid as concrete reinforcement material, however, the ductile nature of polymeric geogrid resulted in excessive deformation and overall poor performance.Titan Environmental Containment Ltd. is teaming up with McGill University to investigate the efficiency of using high strength fiberglass (ConForce) geogrid material to reinforce ground-supported concrete structures. Supported by Alliance grant, this project will pave the way for other geogrid-reinforced applications and promote more university collaboration. Preliminary index tests performed at McGill University indicated that the induced strain at failure is about 1%, which is about one-seventh of that of polymeric geogrid. In addition, the results of pilot field tests done by Titan on new sidewalks in Alberta showed promising results. It is expected that the results of this study will help engineers in designing more sustainable ground supported structures. This study is of importance to Canada as the proposed construction approach could significantly enhance the service life of these structures.This research grant will contribute to the training of one PhD, one MSc, and two undergraduate students.

越来越关注的问题是，直接放置在地面上的结构元素的快速恶化并遭受严格的户外环境条件。例如，人行道通常是由通常暴露于极端天气和腐蚀性条件的混凝土板制成的（例如冬季去冰盐）。加拿大有大约100,000公里的人行道，在给定年内需要更换约20％，估计成本超过10亿美元。市政财政资源有限，并且资金不足以与基础设施不断恶化的步伐保持同步。标准做法是使用未增强或名义上的钢筋来建造大多数混凝土人行行，以进行裂纹宽度控制。但是，在去冰盐，海水，海洋空气等中发现的含有氯化物的化学物质的存在可以攻击将混凝土固定在一起并促进钢腐蚀的键。过去已经尝试将常规聚合地理格脂作为混凝土钢筋材料，但是，聚合物地理格式的潜水性质导致过度变形和整体性能较差。TitanEnvironmental Conment Ltd.正在与McGill University合作使用高强度纤维纤维（Confiber Giberglass（Confiberglass）构造的构建材料，以促进了麦吉尔大学（McGill University）的效率，以加强构造材料。在Alliance Grant的支持下，该项目将为其他土工格林强化应用程序铺平道路，并促进更多的大学合作。在麦吉尔大学进行的初步指数测试表明，失败时的诱导菌株约为1％，约占聚合物地理植物的七分之一。此外，泰坦对艾伯塔省新人行道进行的试验现场测试的结果显示出令人鼓舞的结果。预计这项研究的结果将帮助工程师设计更可持续的地面支撑结构。这项研究对加拿大至关重要，因为拟议的建筑方法可以显着提高这些结构的使用寿命。这项研究赠款将有助于培训一位博士学位，一名MSC和两名本科生。