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Home > Education > Free Web Sessions
Browse from hundreds of recorded presentations from ACI Conventions and other concrete industry events.
Exploring Machine Learning to Predict Concrete Field Performance Against Alkali-Aggregate Reaction (AAR)
Presented by: Ana Bergmann, University of Ottawa
Making the Most of our Data: ACI 135: Machine Learning-Informed Construction and Design (ACI Fall 2023, Boston, MA) As one of the more harmful deterioration mechanisms affecting concrete infrastructures worldwide, the alkali-aggregate reaction (AAR) has been reported in over 50 countries. Among the several testing methods developed in laboratories to assess aggregate reactivity and the effectiveness of supplementary cementitious materials (SCMs) in mitigating AAR, the accelerated mortar bar test (AMBT) and the concrete prism test (CPT) are the most used around the globe. Moreover, field studies have been extensively developed to correlate laboratory tests with structures exposed to a real environment. Yet, current outcomes show significant discrepancies involving the mentioned laboratory tests, indicating no clear thresholds regarding aggregate reactivity potential for new structures. Nevertheless, although extensive work has explored the diagnosis of AAR on existing structures, there is still a lack of defining an accurate model for the prognosis stage. In this sense, the extensive current data on outdoor exposure sites requires implementing elaborated data analysis techniques (i.e., machine learning) to predict AAR development on both existing and new structures. Therefore, this work aims to explore how each variable affects AAR development through probabilistic approaches enhancing the accuracy of management protocols to assess the aggregate reactivity potential via laboratory tests to reduce the risks associated with AAR.
March 4 - 10
Enhancing the Resiliency of Critical Lifeline Bridges in Coastal North Carolina: The Harkers Island Bridge Replacement Project
Presented by: Rudolf Seracino, North Carolina State University
Quantification, Damage Mitigation, and Preservation of Concrete Bridges and Structures under Natural and Man-Made Hazards (ACI Fall 2023, Boston, MA) Prestressed concrete bridges located in aggressive environments of coastal North Carolina require significant maintenance and often require replacement after as little as 40 years of service. Detours during periods of maintenance or replacement are lengthy in such remote areas, and result in significant disruption and direct/indirect costs to industry and local communities. The Harkers Island Bridge replacement, the first all-FRP reinforced/prestressed concrete bridge in North Carolina, was designed to address the problems associated with corrosion of critical lifeline bridges in coastal areas. Construction on the 28 span, 3,200 ft long, Harkers Island Bridge replacement in Carteret County, North Carolina, began in 2021. The existing bridge opened in 1970 and is the only link to the mainland. The existing bridge had its superstructure replaced in 2013 and is currently categorized as structurally deficient due to deterioration from corrosion of the internal steel reinforcing. This presentation will give an overview of the current state-of-practice on the design of FRP reinforced/prestressed concrete bridges in the United States, and an update on the construction progress of the Harkers Island Bridge replacement project.
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