CONCRETE STRENGTH BY COMBINATION OF NON-DESTRUCTIVE TECHNIQUES
Prof. P. S. Lande
Department of Applied Mechanics, Government College of Engineering, Amravati, India, 444604 , IN
Santosh B. Kanase
Department of Applied Mechanics, Government College of Engineering, Amravati, India, 444604 , IN
Keywords: Rebound Hammer, Ultrasonic Pulse Velocity, Frequency Spectrum, Impact Echo Test, Non-Destructive Testing, Compressive Load, Goodness of fit, R-square, RMSE, MATLAB.
Abstract
Due to limitation of conventional method to determine the different characteristics properties of concrete, new technological breakthrough in the field of non-destructive testing (NDT) are emerging as a powerful quality control tool for determination of various characteristic properties of concrete qualitatively. The accuracy and reliability of non-destructive test are influence by the number of variable associated with the harden concrete. Through most of the non-destructive method are based on statistics, it is observed that in actual practice much of this testing is done without use statistical principles leading to erroneous results.
The present work focus on the study of the reliability in interpreting non-destructive testing results of concrete structure and calibration of the NDT instrument such as Rebound Hammer, Ultrasonic Pulse Velocity, and Impact Echo. An experimental work is carried out involving both destructive and Non-destructive testing method applied to different nominal concrete grade of M20, M30, and M40. The specimens consisting 20 each cubes of size 150mm are casted for the correlation purpose.
Correlation between destructive and Non-destructive testing data is established using statistical techniques such as linear regression analysis, and multiple regression analysis. Software MATLAB and Microsoft Excel would be used for this purpose.
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