Abstract
A novel application of holographic interferometry to investigate the deformation behaviour of concrete exposed to frost is reported. Concrete specimens are placed inside a microprocessor-controlled frigorific cabinet. A holographic system is installed partly inside and partly outside the freezing cabinet. Live observation of the deformation behaviour of concrete due to frost action is obtained on a vidicon monitor. Besides demonstrating the existence of stresses in concrete, caused by unequal volume changes of its constituents, exposed to frost, the technique allows one to measure with precision the temperature at which this thermal incompatibility results in the impairment of the hardened concrete paste. A photographic sequence of the disaggregation of a concrete specimen is presented. A numerically simulated concrete model is evaluated by comparing the results obtained from its application with those obtained holographically. A good correspondence between the mathematically computed and experimental behaviour is obtained.
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