Relationship between Ultrasonic Pulse Velocity and Compressive Strength of Concrete for Different Types of Aggregate Available in Bangladesh MD.

Abstract

For quite a few years, many attempts are made in order to find a suitable relationship between ultrasonic pulse velocity (UPV) and compressive strength of concrete. Such relations, if properly established, can promote a sustainable structural health monitoring system. Therefore, in this study, different types of aggregate that are commonly available in Bangladesh are tested in order to find a working relationship between UPV and compressive strength of concrete. Tests have been carried out on 7, 28, 60 and 90 days. Three volumetric sand to total aggregate ratios (s/a) 0.36, 0.40, 0.44 are considered to study the effect of variation of s/a. And, three W/C ratio are chosen as 0.45, 0.50, 0.55. The cement paste occupies 32% of the total concrete volume (VPaste =32%). For some cases, volumetric mix ratios of 1:1.5:3 and 1:2:4 were also prepared in order to relate to the common field practice. Here, the compressive strength of concrete is related with UPV on the basis of s/a ratio variation. Some relationships are proposed between UPV and compressive strength. The possibility of relationship between Young’s modulus of concrete and UPV is also explored. Another part of the study was to find out the suitability of steel slag as a coarse aggregate for construction purpose. Different steel slag aggregates ABSTRACT vi were tested for aggregate properties. Also, the behavior of UPV on concrete made with steel slag was found out to take a comprehensive study. Finally, an elaborate and comprehensive analysis is made in order to compare between concrete made with different aggregates to have a final view about the relationship between ultrasonic pulse velocity (UPV) and compressive strength of concrete.