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Comparison of Sample Size and Curing time on Concrete Performance

The goal of this research is to continue department’s initiative to reduce test specimen size and support departments transition to Performance Engineered Mixture (PEM) implementation. The funding for this project will allow the department to sample and perform testing on various concrete mixes across the state and gain deeper understanding on how concrete mixes in Wisconsin will perform. Due to an increased use of Supplementary Cementitious Materials (SCM) in Wisconsin to improve durability of concrete mixes, Federal Highway Administration (FHWA) Mobile Concrete Technology Center (MCTC) laboratory and Wisconsin Highway Research Program (WHRP) studies indicated that using 28-day test results for acceptance may not be the most accurate representation of concrete performance as some SCMs require additional time to activate and gain strength in the concrete mixture. Wisconsin Department of Transportation (WisDOT) plans to evaluate the impact of extended curing of concrete strength specimens. These strength specimens can also be used to measure surface resistivity at 56 days to compare with surface resistivity values measured using the accelerated cure method per WTM T358. WisDOT would also investigate reducing compressive strength specimen size from 6”x12” to 4”x8”.