General White Papers and Product Information

Presented Papers

  • Determination of Chloride Ion Concentrations  in Concrete by means of Near-Infrared Spectroscopy
    Presented at SPIE Smart Structures/NDE, March 2011
    Describes applications for NIR spectroscopy in assessment of corrosion of concrete in bridges and infrastructure using PD-LD’s proprietary VBG™ technology.
    Abstract: Concentration of chloride ions was determined with a classical chemical titration method in three types of samples: a cracked concrete core and an undamaged concrete core, both taken from a bridge in Iowa, and also from concrete test samples prepared at Rutgers University. Chloride concentration profiles were obtained. The same samples were the subjected to the near infrared spectrometric determinations of chloride content by two manufacturers of spectrometric instruments. Very good correlation between the chemical and spectrometric measurements was obtained [ R2> 0.96], thus opening the possibility of rapid on-site chloride concentration determination in concrete structures.