Building 306 Section 1 concrete strength was estimated by the means of a rebound hammer. In error the “before” measurement was taken from the Section 2 of the ring girder beam. The section did not receive SURTREAT and is currently under coating. The “before” January 2007 measurement on Section 2 (random area 30 strokes) averaged 3,000 psi. In July 2010 the measurement taken on SURTREAT treated Section 1 of the ring girder beam (random area 30 strokes) averaged 6,000 psi. It is common to see concrete strength increase following SURTREAT application. BUILDING 306 Section 2
Building 306 Section 2 is a designated installation area for the NASA galvanic liquid coating. Applied to the concrete surface, acting as a type of cathodic protection, the coating components are designed to corrode preferentially when connected to the imbedded rebar. Data was collected in July 2007 and in July 2010. With some variation it showed that an electrical current was being generated by the coating. Also, there was an increase in rebar corrosion rate once the coating was disconnected. Both of these phenomena point to the coating functioning as intended. The difficulties associated with the evaluation included the suspected presence of an unknown short within the system in disconnected” state, suspected interference from the system as electrical measurements were being taken, scarcity of the established “tried and true” field evaluation procedures. For more technical data and data analysis on the NASA galvanic liquid coating please see the July 2007 Elzly Technologies report made part of the published US Army CERL project report (ERDC/CERL TR-09-27), September 2010 Corrpro report and 2008 ERDC/CERL TR-09-27 report.
Based on the results of the three-year evaluation, components of the SURTREAT system were found to be functioning as intended. Procedures designed to evaluate the performance of the NASA galvanic liquid coating in the field need to be refined.