Improving ground penetrating radar evaluation of corrosion in reinforced concrete bridge decks

改进探地雷达对钢筋混凝土桥面腐蚀的评估

• 批准号: 386564-2010
• 负责人: Barnes, Christopher
• 金额: $ 1.82万
• 依托单位: Dalhousie University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2013
• 资助国家: 加拿大
• 起止时间: 2013-01-01 至 2014-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=528942
• 关键词: Improving; ground; penetrating; radar; evaluation

This Discovery grant proposal supports a long term research program at Dalhousie University in Non-Destructive Evaluation (NDE) of civil infrastructure by extending techniques for evaluating Ground Penetrating Radar (GPR) data from exposed surface (unpaved) reinforced concrete decks to the more complicated case of asphalt paved decks. Reinforced concrete bridge decks tend to be one of the most problematic elements to accurately diagnose corrosion damage, particularly when asphalt concrete wearing surfaces are present. The proposed research will extend our fundamental understanding of how GPR signal propagation is affected through multilayered pavement systems (bridge decks) and their various degrees of damage and chloride contamination. Specifically, the research will focus on two areas: modeling and quantifying signal attenuation resulting from the condition and thickness of the asphalt concrete; and, the effect of different chloride concentration profiles within the cover layer on the signal loss threshold used to predict corrosion damage. Successful adaptation of the applicant's current approach for evaluating unpaved reinforced concrete bridge decks to the more common and complex case of deteriorated asphalt-paved decks will greatly improve the accuracy and reliability by which repairs of corrosion-induced damage can be estimated and prioritized on a network level. Modeling and calibrating the phenomena over a broad range of normal and high performance concrete mixtures used in industry today will extend its application to a broader range of materials used in service. The ability to evaluate the condition of the asphalt concrete will also have significant impact in highway pavement systems evaluation. One Ph.D. and two Master of Applied Science students will be trained through the proposed research, developing two consulting engineers who are skilled in GPR investigations of infrastructure and one academic researcher who will continue to advance research in this field. The students will gain a foundation of strong research skills and industrial experience through collaboration with international colleagues, local industry, and research presentations at relevant international conferences.

该发现拨款提案支持达尔豪斯大学土木基础设施无损评估 (NDE) 的长期研究计划，将评估裸露表面（未铺砌）钢筋混凝土甲板的探地雷达 (GPR) 数据的技术扩展到更复杂的情况的沥青铺装甲板。 钢筋混凝土桥面往往是准确诊断腐蚀损坏最成问题的元素之一，特别是当存在沥青混凝土磨损表面时。拟议的研究将扩展我们对多层路面系统（桥面）及其不同程度的损坏和氯化物污染如何影响探地雷达信号传播的基本理解。 具体来说，该研究将集中在两个领域：对沥青混凝土的状况和厚度造成的信号衰减进行建模和量化；以及覆盖层内不同氯化物浓度分布对用于预测腐蚀损伤的信号丢失阈值的影响。 申请人目前评估未铺砌钢筋混凝土桥面的方法成功适应了更常见和复杂的劣化沥青铺砌桥面的情况，将大大提高准确性和可靠性，通过该方法可以在网络上估计和优先考虑腐蚀引起的损坏的修复等级。 对当今工业中使用的各种普通和高性能混凝土混合物的现象进行建模和校准，将其应用扩展到更广泛的服务材料。 评估沥青混凝土状况的能力也将对公路路面系统评估产生重大影响。 一名博士。两名应用科学硕士生将通过拟议的研究接受培训，培养两名擅长基础设施探地雷达调查的咨询工程师和一名将继续推进该领域研究的学术研究员。 通过与国际同事、当地行业的合作以及在相关国际会议上的研究报告，学生将获得强大的研究技能和行业经验。