Prediction of Refractory Strength Using Non-Destructive Sonic Measurements

Authors: Fawzy Aly and C.E. Semler, Refractories Research Center, The Ohio State University

Abstract

Mathematical relations were evaluated and equations are presented correlating non-destructive sonic measurements, using either ultrasonic velocity or modulus of elasticity, with modulus of rupture for five representative fired refractory product types, including high alumina (90%), mullite (70% alumina), super-duty fireclay (42% alumina), vitreous silica (99% silica) and carbon. The experimental relations were tested for additional brands and found to yield predicted strengths that were within 0.5% to 6% of the actual strengths for refractory products having properties similar to the model refractory product used to develop the correlation equation. For refractory products with properties that were dissimilar to the model refractory, the predicted strengths differed from the actual strengths by >20%.