REAPROVEITAMENTO DE CONCRETO FRESCO DE ESTACAS HÉLICE CONTÍNUA PARA FABRICAÇÃO DE ELEMENTOS PRÉ-MOLDADOS

Abstract

In foundation works of the continuous propeller type, it is a recurrent event to interrupt the concreting process due to the unpredictability of the ground or breakage of some of the equipment, such as the drilling machine or concrete pump, and if there are concrete mixer trucks loaded in the work it can lead to loss of the concrete contained in it. Without destination, the concrete can be wasted, which results in increased costs, clandestine disposal and, consequently, the contamination of the environment. We then investigate the reuse of fresh concrete from continuous propeller piles in order to elaborate solutions to be used for the concrete that would be discarded for use in the work itself through the manufacture of precast elements. To do so, it was necessary to quantify these losses and estimate the increased cost caused by the disposal, to elaborate a design of the precast parts, to develop the forms and to apply concrete in the precast parts. A division was made in two distinct cases: The first case was the reuse of concrete leftovers up to 0.5m³ for the production of yards, counter-yards and pavers, in the second case it was used leftovers with volumes larger than 0.5m³ in the creation of a concrete block applicable in solutions of geotechnical works. Given this, it is verified that this discarding generates a minimum cost of R$ 547.30 per cubic meter of concrete, which value will increase as the strength of the concrete used rises. The pieces were possible to be concreted, however some improvements should be applied to facilitate their execution as the replacement on the material of the forms from wood to metallic materials which will bring benefits such as facilitating the unmount of the elements, and its reuse several times. And depending on the work, you can manipulate the dimensions of the shapes to meet your needs and make the reutilization feasible for the same.