Effect of sulphates in cement (containing 5% pozzolana) and in sand on the correlation between compressive strength and u.p.v. of concrete of different mixes

Abstract

Sulphates may be found in any of the raw materials of cement. Sand contaminated with sulphates is currently a local problem because of the difficulty in obtaining well-graded sand which could be used in concrete that has an acceptable sulphate content. In this work, the effect of sulphates in cement, with S% pozzolana, and in sand on the correlation between compressive strength and ultrasonic pulse velocity (U.P.V.) of concrete of different mixes such as 1:1.5:3, 1:2:4, and 1:3:6 is studied in order to asses the degree of the correlation of different mixes and its resistance to sulphate attack. We can conclude that the U.P.V. seem to be a good method for assessing the quality and strength of the concrete specimens.