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Abstract: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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