Resistivity Tests for Concrete-Recent Field Experience

摘要

This paper analyzed surface resistivity (SR), bulk resistivity (BR), and rapid chloride permeability test (RCPT) data collected from 11 concrete paving field projects from across the country. The data showed that the results from the three tests correlate well and confirms the work performed by previous research on laboratory samples. However, the data indicates that care should be taken when using 28-day SR data in lieu of 56-day RCPT data because they may not correlate well for all mixtures. Depending on the project, the coefficient of variation (COV)for SR and BR for production samples ranged from 5% to 25% with an average of 13% and 12%, respectively. The SR and BR COVs for all the projects were lower than the COV of RCPT. Data showed little to no correlation between 56-day SR with fresh concrete properties and 28-day compressive strength.