Reducing Concrete Cure Times for Bridge Substructure Components and Box Culverts
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2023-09-01
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Edition:Final Report 8/16/20–9/30/23
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Abstract:This report investigated pathways to reduce concrete curing time while maintaining mechanical and durability performance. Among several options such as admixtures, supplementary cementitious materials, and low water-to-cement ratio, researchers explored two mix designs in a field demonstration project. For Stage I of the project, a low water-to-cement ratio concrete mixture was used. For Stage II, the use of calcium-silicate-hydrate (C-S-H) based seeds was explored. Concrete laboratory mixtures containing C-S-H seeds X1 and X2 exhibited increased early-age strength and reduced permeability. Based on these findings and the Illinois Department of Transportation acceptance of X2 as a Type S admixture, a field demonstration project was conducted on a box culvert near Armstrong, Illinois. The X2 concrete mix design was compared to a low water-to-cement ratio concrete mix design. Results showed that the X2 mixture with C-S-H seeds consistently demonstrated higher strength than the low water-to-cement concrete mixture, suggesting that seed-based admixtures can provide additional benefits for reducing curing times. The recommended dosage of X2 is 5 fl oz/cwt for optimal performance in reducing cure time.
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