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Optical Engineering

Holographic Interferometry Applied At Subfreezing Temperatures: Study Of Damage In Concrete Exposed To Frost Action
Author(s): Pramod K. Rastogi; Pierre Jacquot; Leopold Pflug
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Paper Abstract

The aim of this research is to use holographic interferometry to evaluate the frost susceptibility of concrete. Concrete specimens are subjected to subzero temperatures inside a freezing cabinet. A holographic system is implanted astride both the interior and exterior of the cabinet. Problems related to the implementation of such a measurement system are discussed, and ways to overcome them are described. A fringe control capability eliminates the influence of rigid-body movements and controls the fringe density. The developed system enables one to monitor in real time the evolution of the deformation of concrete specimens exposed to freezing cycles. Besides demonstrating the existence of stresses arising from the thermal incompatibility between the components of the concrete, the method provides an accurate measurement of the temperature at which this thermal incompatibility leads to the impairment of the hardened concrete paste. Results computed from the application of a mathematical model are compared with those obtained by holographic interferometry. Close agreement between the numerically computed and the experimentally observed behavior is obtained.

Paper Details

Date Published: 1 February 1988
PDF: 7 pages
Opt. Eng. 27(2) 272172 doi: 10.1117/12.7976663
Published in: Optical Engineering Volume 27, Issue 2
Show Author Affiliations
Pramod K. Rastogi, Swiss Federal Institute of Technology, Lausanne (Switzerland)
Pierre Jacquot, Swiss Federal Institute of Technology, Lausanne (Switzerland)
Leopold Pflug, Swiss Federal Institute of Technology, Lausanne (Switzerland)

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