Determinação da resistência à compressão de concreto produzido com agregado graúdo de superfície modificada

Abstract

With the difficulty of obtaining a coarse aggregate of the type Brita in the research study region, there is a demand for an aggregate that is more economically viable compared to others, pebble gravel is a relatively cheaper and easily accessible material, however, the physical characteristics of its surface generate low adhesion with the cement paste, resulting in a less resistant transition zone. By modifying this surface of the pebble, we can obtain concrete with greater resistance compared to concrete with common pebble. To analyze this difference in resistance, a compressive strength test was carried out on concrete specimens made with modified surface aggregates and with common pebbles to obtain a reference value. The modified surface aggregates were made using two methods, the first coated the aggregate with a cement paste, the second, in addition to coating it with the cement paste, also adds sand to the process. To manufacture the surface modified aggregates, it was necessary to determine a trace for the surface modifying paste. The specimens that contained the surface-modified aggregates showed significantly greater resistance than the reference specimens, which implies that the chosen mix and the applied methods actually brought an improvement to the concrete's resistance, concluding that this method is a viable solution to the problem.