ULTRASONIC EVALUATION OF GYPSUM PLASTER

Ultrasonics have been used for the characterization of set plaster in the water ratio range 0.3 to 1. The variation of ultrasonic velocity w ith porosity has been studied. The elastic modulus and strength of pla ster have also been evaluated. The study indicates both elastic modulu s and strength properties correlate well with the ultrasonic velocity. Thus the ultrasonic velocity can be used as a predictor of strength a nd elastic moduli of these materials.