ABSTRACT
it is the objective of the civil construction, to reduce the weight of the structures and consequently the costs with the foundations. The replacement of brittle by light aggregates is the most commonly used alternative. However, especially in Brazil, there is only a single light aggregate plant located in São Paulo, and the timing of research on raw materials for the dissemination of aggregate production in other regions of Brazil. Proportionally, this type of segment values the reuse of waste from several segments. In this work a synthetic aggregate of calcined clay was produced with the incorporation of glass residue of packing with SiO2, Na2O and CaO base, in order to replace brittle for concrete use. Incorporations of 0 to 20% of glass were tested and the masses were characterized by plasticity index, XRD, FRX, DTA / TG, cation exchange capacity and actual specific mass. The specimens were produced by axial pressing at a pressure of 30 MPa, in a cylindrical format with a diameter of 20 mm and a height of 15 mm. After burning, the specimens were characterized in tests of water absorption, apparent density and mechanical resistance to compression. It was observed that as the glass residue was incorporated into the formulations, the mixtures presented increasing mechanical strength and lower water absorption due to the incorporation of the fluxing oxides that favored the formation of liquid phase. However, when the 20% incorporation limit was reached and the burn at 1000 oC, a volume increase was observed due to the higher liquid phase formation that filled the void spaces, making it difficult to escape the gases trapped. It was concluded that the glass residue when incorporated in the clay under study can be used in two ways: as a flux for addition of mechanical resistance and apparent specific mass and reduction of water absorption or with the function of reducing the property density that is fundamental for the production of lightweight aggregate.
Keywords
synthetic aggregate; ceramics; glass; recycling
