A utilização de cinza gerada em unidade agroindustrial como potencial componente para a produção de pavimento intertravado de concreto

Abstract

At the end of the second decade of the 21st century it is possible to observe that environmental exploitation and environmental impacts arising from human activities, in particular industry, together with technological development reflect relevant concerns with the preservation of the environment, with emphasis on sustainability principles. In industrial production, inevitably the production of the most varied types of waste is recorded. Among these residues stands out the production of ash, resulting from the need for power generation and steam production with the use of boilers. This research aimed to study and characterize the gray residue produced in an agro-industrial unit and to research its potentialities in the reuse and production of prefabricated concrete blocks (pavers) incorporating the ashes from the agro-industrial unit. To investigate the use of ash as aggregate in the manufacture of construction artifacts, it was used Portland cement CP-II, natural aggregates gravel and sand and, ash as recycled kid aggregate, which replaced cement in the proportions of 0, 5, 10, 20 and 40% as treatments under study. We opted for the process called sleeping parts for the preparation of pavers or experimental units. This process is characteristic of manual manufacturing and small regional precast industries in the state of Paraná. Material characterization tests, mechanical tests and statistical evaluations of the results were carried out in order to evaluate the effects of the treatments researched. It was recorded that, in the water absorption assay, the pavers made with the different treatments presented high absorption, whosecontents were higher than the maximum value of 6% required by the Brazilian standard. The result of the compressive strength tests, the samples did not reach the minimum limit stipulated by the standard 35 MPa, however, statistical analyses at the level of 5% significance revealed that the treatments presented difference between the means of resistance. The results of t he compressive strength variable indicated that the use of ash is feasible in the making of the paver when there is replacement of the studied cement in the proportions of 5,10 and 20%.