Oklahoma State University
Admixtures, concrete, Concrete resistivity, Durability, Oklahoma, permeability, Quality control, Sensitivity analysis
The durability of concrete is widely recognized to be controlled by the ingress of water and aggressive chemicals. One way to promote long term durability of concrete is to produce a material with a low permeability so that these outside fluids cannot rapidly ingress into the concrete. The challenge has been that permeability was not measured or specified by engineers because there was not a good way to measure it. This has recently changed with the widespread introduction of the resistivity meters which are used to measure the flow of electrons through concrete. This work will aim to develop specifications for Oklahoma, standardizing sample conditioning, and focusing on further investigation of the use of resistivity for concrete in field structures. The objective of this project is to investigate the potential of resistivity testing in assessing the performance of typical concrete mixtures used in bridge and pavement infrastructure in Oklahoma. The sensitivity and reliability of the method with Oklahoma materials will be investigated in order to formulate new guidelines and specification that would allow Oklahoma Department of Transportation (ODOT) to produce high quality concrete. These specifications could be used to approve and accept concrete mixtures. Strength would no longer be the only value that is used to accept a concrete mixture and instead a measurement of permeability could be included. This study will evaluate the use of resistivity to evaluate field structures. This research shows promise to make great changes to the quality and long term performance of Oklahoma concrete by using this simple by utilitarian testing method.