The Study of Concrete Mixture Performance to Support the Non-Destructive Testing Evaluation

Abstract

Abstract An experimental program is conducted which three type of concrete mixtures are made to express the different in quality of concrete. Each type of concrete mixture will be consisting of two type of specimens, i.e., ∅100mm × 200mm in height and ∅150mm × 300mm in height. Each set will be 30 specimens, so the total specimens are 180. All the specimens will be tested in the standard age of 28 days. All of them will be tested as follow: (1) Rebound hammer test, (2) ultrasonic pulse velocity, and (3) compressive test. The ∅100mm test specimens having correlation ranged from 90% to 95% against ∅150mm test specimens. The rebound number of Schmidt hammer test having good correlation to the compression strength since it has the R2 of 0.8259, so that the regression value to be 0.9088. The ultrasonic pulse velocity reading also having good correlation to the compression strength since it has the R2 of 0.8006, so that the regression value to be 0.8946. The combine between rebound number, ultrasonic pulse velocity against the compression strength, after being normalize and analyse using nonlinear dynamic regression, having the good correlation since it has the R2 of 0.9843 and so that the regression value to be 0.9921. The chart produced from the nonlinear dynamic regression can be used directly to predict the concrete compression strength from the rebound number and the reading of ultrasonic pulse velocity.