United States Department of Transportation
i
Phase II – Investigation and Guidelines for Best Practices of Mass Concrete Construction Management
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2022-07-01
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[PDF-12.27 MB]
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Edition:Final Report July 2019 – July 2022
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Abstract:The objective of this research is to improve and validate the mass concrete thermal management methods (e.g., passive or active cooling) and decision-making tools developed from the Phase I research (Investigation and Guidelines for Mass Concrete Construction Management) against the Georgia Department of Transportation’s (GDOT’s) real-world mass concrete construction projects. A case study was conducted on the actual bridge construction site to identify the thermal behavior of mass concrete structure. The team developed a simplified nomogram to support the appropriate thermal control plan selection, as well as investigated the real-world cost implication of thermal management methods. Through the Phase II research, the research findings are: 1) active cooling is three times more expensive than passive cooling, but passive cooling requires a very long curing time, 2) when paired with an uncertainty assessment, nomograms can provide useful estimates of maximum temperatures in hydrating mass concrete with or without postcooling, 3) using alternative cementitious systems than OPC (fly ash, coarser cement) leads to satisfying temperature limits without using stringent thermal control plans, 4) statistical methods can be successfully used as an alternative modeling approach to optimize mixture design selection, and 5) the cost nomogram can simply estimate the total cost for pre-cooling and post- cooling methods roughly. These efforts led to development of practical tools for the specification of standardized thermal management methods.
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