Effect of conditioning temperature on the strength and permeability of normal- and high-strength concrete

In order to evaluate the effect of the conditioning temperature on strength and permeability properties of concrete a series of compressive, indirect tensile and permeability tests were performed on concretes (designed to have 28-day compressive strengths of 40 and 100 N/mm(2)) conditioned at temperatures of 85 and 105 degrees C. The results show that, for both the normal- (NSC) and the high-strength concrete (HSC), comparable 28-day test results were obtained from strength tests performed on concrete conditioned at 85 and 105 degrees C. The permeability results were also somewhat similar for the two conditioning temperatures, although greater differences than previously reported were observed. Conditioning at both 85 and 105 degrees C was identified as adequate, with the preferred temperature of conditioning being 105 degrees C. (c) 2004 Elsevier Ltd. All rights reserved.