Diseño de una mezcla de hormigón de alta resistencia y su comportamiento en una viga de hormigón armado sometida a cargas de flexión

Abstract

Concrete is the most widely used material in the field of construction, but in the case of constructions that need to support great pressures, the concretes of normal strength are not enough. For this reason, the concrete strength has been increased over the years; however, high strength concrete can be expensive due to the type of materials that usually include. The objective of this research project is to develop a design of concrete with a strength of 1000 kg / cm2 without incorporating of materials of controlled granulometry or fibers. The method employed to obtain this compression strength, is the ACI 211.4R. This method is used as a starting point to develop higher strength concretes, since the method has reference values for a maximum resistance of 843 kg/cm2. After having the design completed with a strength of 843 kg/cm2, some variations of the a/c ratio must be made, as well as the amount of additive, among others to achieve the required resistance. Additionally, non-destructive and destructive tests were performed on the hardened concrete. The results obtained from the tests performed on high strength concrete substantially exceed the characteristics of a normal strength concrete. Moreover, some reinforced concrete beams were made with a f'c of 1000 kg/cm2 using the same steel reinforcement and the same dimensions as a beam with a f'c of 450 kg/cm2 made for a subject of tenth semester. The behavior of the concrete of strength of 1000 kg/cm2 in reinforced concrete beams was more appropriate than the concrete of 450 kg/cm2. Since, the beams with concrete of 1000 kg/cm2 had ductile failure while the beams with concrete of 450 kg/cm2 had fragile failure.