The aim of the research is to check the strength of concrete for steel fibers and fly ash, pin penetration and ultrasonic pulse velocity (UPV) for assessing concrete strength, that are widely used in structural field. The NDT are compared on basis of sensitivity of measurements and scatter of results. The advantage deriving from the steel fibers and fly ash as a variable for concrete strength is also examined. An extensive series of tests are carried out to obtain a correlation of the NDT results with compressive strength. Concrete cubes for each two different materials which are fly ash and steel fibers, are tested. Tests are performed to compare the accuracy between Destructive and non-Destructive method in estimating the strength of concrete.

Full text: IJEIR_1651_Final.pdf