Determination of Concrete Characteristics Using Destructive and Non-Destructive Test

Malek Jedidi
2020 Current Trends in Civil & Structural Engineering  
Concrete has now a days become the most used material in the construction of structures. Its compressive strength is the most important parameter to control in order to assess its quality [1] . In the current state, the most used method to control the quality of concrete on site, consists in carrying out destructive tests on specimens taken during the production of structural elements. However, these test specimens are not representative of structural concrete because of the difference in the
more » ... difference in the conditions of placing, tightening and curing, which are the main factors affecting the strength of concrete [2, 3] . The judicious choice of materials, correct implementation, the adoption of appropriate constructive arrangements play an essential role in the art of construction. However, as an important part of his activities is devoted to the problems of dimensioning of constructions, the engineer attaches particular importance to the characteristics of mechanical resistance and deformation of materials, because their knowledge is essential for him to realize constructions that are both safe and economical. In order to get around these problems, a range of non-destructive tests has been developed. These tests offer a practical and reliable means to assess the real quality of concrete in situ without affecting the structural behaviour of the elements [4] [5] [6] [7] [8] . However, the strength of concrete can only be assessed by these methods, but not measured. It is therefore useful to establish experimental relations between the property measured by a given test and the resistance of a test-tube or carrot of the same concrete [9] . Destructive tests are generally carried out in the laboratory on specimens made from concrete taken from the batch. The resistance must be equal or greater than the specifications required for the corresponding type of concrete. This work is licensed under Creative Commons Attribution 4.0 License CTCSE.MS.ID.000627. Abstract Mechanical resistance and deformation are important characteristics of concrete, because they play a great role not only for the stability, but also for the durability of the structures. When concrete is subjected to the action of a rapidly increasing load, it behaves like a brittle material. On the one hand, its rupture is not preceded by significant deformations and on the other hand, its tensile strength is much weaker than its compressive strength. The tensile strength even vanishes completely if shrinkage cracks have developed. This paper presents an experimental study in order to determine some characteristics of the concrete made for the production of reinforced concrete beams. To this end, cylindrical specimens of dimensions 16 x 32 cm were prepared in the laboratory using local materials for mechanical characterization by destructive and non-destructive tests. Splitting test was carried out to determine experimentally the tensile strength of concrete. Schmid rebound hammer and compression machine were used to determine the compressive strength of concrete, as well as its longitudinal elastic modulus (Young's modulus) at the age of 28 days. The results obtained by the various tests were compared to validate the measured values. Indeed, the concrete resistance measurements from the rebound hammer test were compared with those obtained by the compression test. Likewise, the concrete tensile strength values of the splitting test were compared with those found from the compression test.
doi:10.33552/ctcse.2020.06.000627 fatcat:w75xiaa5pbetjof7fuahqkwi2e