Uso de resíduos do laboratório de materiais de construção da UFT para fabricação de blocos de concreto de pavimentação

Abstract

The civil construction industry is responsible for a large expenditure of natural resources and for the generation of a wide range of waste. The use of recycled aggregates from concrete has been presented as a promising alternative for the manufacture of new concrete components in civil construction. The Construction Materials Laboratory at the Federal University of Tocantins, Campus Palmas, produces a lot of concrete waste in the form of specimens, as a result of academic research carried out by Civil Engineering students. These residues are discarded close to the laboratory and do not have an adequate destination, and that is why they have become a problem. The present work sought to use these crushed residues with partial replacement of coarse aggregates in the production of Type 1 precast paving blocks. The replacements were in the contents of 25%, 50% and 75% of natural coarse aggregates, in addition to a natural trait. of reference. The evaluation of the feasibility of replacement was carried out through visual inspection, dimensional analysis, and water absorption and compressive strength tests of the blocks produced. The water absorption of all paving blocks satisfactorily complied with what is specified in the standard. The mixes using recycled aggregates achieved greater compressive strength compared to the reference mix, and the mixture with a content of 75% showed the best mechanical behavior. Thus, it was possible to show through the research a new possibility for the disposal of concrete waste from laboratories, in order to minimize the environmental and visual impacts within the University and a possible appropriate destination.