Post on 05-Apr-2018
Driving Indiana’s Economic Growth
New Technology in Concrete Testing
Tommy NantungOffice of Research and DevelopmentIndiana Department of Transportation
ACPA Indiana Annual Meeting, January 28, 2009
Thickness Measurement
MIT Scan T2Magnetic Tomography TechnologyMeasure concrete and asphalt thickness during constructionUsing metal plate as thickness referencesNo time consuming calibrationEuropean Standard
Accuracy
Specified: 0.5% of the measured depth +1 mmTranslates to 0.1 in (less than 3 mm) for 13 in pavementField trials consistently produced less than 0.1 in measurement error
Impact Echo
Non-destructiveFlat concrete surfaceBased on impact echo technology, speed of sound waveVery easy to useData acquisition and software included
New Impact Echo
Use surface wave to calibrate wave speedNo concrete block for calibrationIntegration with other NDT testingBetter data acquisition
Air Void Analyzer
Measure air entrained in fresh concreteDoes not measure entrapped airFew State DOTs use as standard testingFairly accurate in determining air content
Coffee Cup Hydration Testing
Monitor heat of hydration of cementDetermine compatibility of concrete materialsEarly screening for mix design approval