Estudo comparativo entre o ultrassom em corpos de prova de concreto e sua resistência à compressão axial

Abstract

The non-destructive methods are high in the market because of the great need for new tests that can analyze the structure without damaging it. The method of ultrasound, one of the most wanted when it needs to predict cracking, assess the quality of concrete and monitor the structure, either during the construction phase or ready-made structures. However, like most of the tests, the ultrasound test is also subject to errors, which can be minimized by trained personnel. This work is divided into two phases. Cylindrical molds, 10x20cm, were used in all experiments, which were all performed at 7 days after molding. In the first phase 20 bodies were executed in Construction B. The concrete used was Company D and it had a Fck project of 30 MPa. The bodies were tested at Nutec (Industrial Technology Center of Ceará), but before that, the ultrasound was used to measure the pulse velocity. In the second phase 20 bodies were executed in Construction C. The concrete used was Company D and it had Fck project of 20 MPa. The bodies were tested at the Materials Laboratory in the UFC (Federal University of Ceará), but before that, the ultrasound was used to measure the pulse velocity. It was performed 40 tests of compressive strength and 40 tests of ultrasound (120 measurements). In this paper, based on the results obtained from the tests, concrete quality is analyzed and the correlation curve between the pulse velocity and compressive strength of the concrete is drawn. Along with the curve are proposed other possible correlation equations. The curve chosen was not considered ideal by not convey a good correlation between pulse velocity and axial compressive strength of the concrete. Now in its evaluation, the concrete result played an excellent quality for the value of pulse velocity.