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.

人们日益关注的一个问题是直接放置在地面上并遭受恶劣室外环境条件的结构元件的快速损坏。例如，人行道通常由混凝土板制成，通常暴露在极端天气和腐蚀性条件下（例如冬季的除冰盐）。加拿大约有 10 万公里的人行道，其中约 20% 的人行道每年需要更换，估计成本超过 10 亿美元。市财政资源有限，没有足够的资金来跟上日益恶化的基础设施的步伐。标准做法是使用未加固或名义上钢筋的混凝土人行道来建造大多数混凝土人行道，以控制裂缝宽度。然而，除冰盐、海水、海洋空气等中含有氯化物的化学物质的存在，会侵蚀将混凝土粘合在一起的粘结剂，并导致钢材腐蚀。过去曾尝试使用传统的聚合物土工格栅作为混凝土加固材料，但聚合物土工格栅的延展性导致变形过大，整体性能较差。Titan Environmental Containment Ltd. 正在与麦吉尔大学合作，研究聚合物土工格栅的效率使用高强度玻璃纤维（ConForce）土工格栅材料加固地面支撑混凝土结构。在联盟拨款的支持下，该项目将为其他土工格栅加固应用铺平道路，并促进更多的大学合作。麦吉尔大学进行的初步指标测试表明，失效诱导应变约为1%，约为聚合物土工格栅的七分之一。此外，泰坦在阿尔伯塔省的新人行道上进行的试点现场测试结果显示出有希望的结果。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。这项研究对加拿大很重要，因为拟议的施工方法可以显着延长这些结构的使用寿命。这项研究拨款将有助于培训一名博士生、一名硕士生和两名本科生。