Self Curing Admixture Performance Report

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Manual for Design, Construction, and Maintenance of Orthotropic Steel Deck Bridges

Author: Anderson, Darryl DiBrito, Bill | Size: 2.77 MB | Format: PDF | Quality: Original preprint | Publisher: Anderson Engineering and Surveying, Incorporated | Year: 2012 | pages: 60

The Oregon Department of Transportation (ODOT) has experienced early age cracking of newly placed high performance concrete (HPC) bridge decks. The silica fume contained in the HPC requires immediate and proper curing application after placement to avoid early age cracks. Many construction contractors do not consistently apply adequate curing procedures, and project sites may not have easy access to water. This problem led ODOT to investigate a self-curing admixture (SCA) for bridge deck concrete mixes. The SCA reduces wet curing requirements by counteracting to some degree water loss due to evaporation. An admixture in place of wet curing that allows HPC bridge deck concrete to cure properly without early age cracking and without decreasing other performance requirements would provide another option for contractors. The study showed that concrete with the SCA after a 3-day wet cure can produce similar results to standard HPC concrete with a 14-day wet cure. However, the concrete additives in the concrete must be compatible with the SCA.

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