Bridge Deck Core Control

This paper describes the use of core control to improve the interpretation of nondestructive test data to evaluate the condition of concrete bridge decks. Eight concrete bridge decks in central Missouri were investigated using ground penetrating radar (GPR) and portable seismic property analyzer (PSPA). Cores were located by interpreting GPR data on site to identify regions with varying levels of suspected concrete deterioration. The seismic modulus was determined at each core location using PSPA before coring. Visual observations were made during coring to document the surface conditions at each core location, ease of core extraction, and visible delaminations in the core hole. The physical condition of each core was assessed, taking note of any signs of deterioration, including fractures, voids, and areas of discoloration. Laboratory testing was performed on the cores to measure the porosity of the concrete and the water-soluble chloride content, along with elastic properties to compare to the PSPA data obtained in the field. Physical assessment and laboratory results were correlated with the PSPA and GPR data to improve the data interpretation to assess the actual bridge deck conditions.