Local concrete characterization assessment by the means of non-destructive tests (NDT) methods

摘要

The physical and mechanical properties of concrete are depend mainly on the quality of materials, technologies and conditions of placement. The evaluation of the quality of concrete is fundamental in regard to the number and diversity of projects made by this material. Although it is not possible to make a direct measurement of the strength of concrete or other properties of a project by direct compressive test; several Non-Destructive Test methods (NDT) have been developed in order to assess and characterize the properties of concrete on site, including the ultrasonic velocity and rebound hammer tests. The present work presents an experimental evaluation of the physical and mechanical properties of an ordinary concrete based on local materials from the region of Bordj Bou Arreridj (250 Km from Algiers). The parameters taken into account are the resistance of concrete beside the grading type, continuous (C_c) and gap graded (C_d) for based coarse aggregate concretes. The results of this study provide correlations between the various measures and exhibit the impact of these parameters for the correlations observed, comparisons were made between the correlations proposed in this study with some existing correlations in the literature to see the placement conditions and local materials influence on measured values by such methods in the case of ordinary concrete with acceptable conventional strength less than 40 MPa at the age of 28 days.