Desempeño, factibilidad y sostenibilidad de hormigones hidráulicos estándares con el uso de agregados reciclados

Abstract

The project focuses on the development of sustainable concrete, implementing recycled aggregates as partial substitutes for coarse aggregate. The materials that were recycled and incorporated into the mixtures come from waste from the production process of porcelain and ceramic pieces, just as glass from the collecting of broken bottles of ordinary use is implemented. The materials were duly characterized, and both natural aggregates and recycled aggregates, met the necessary characteristics to be incorporated into concrete mixtures under ASTM C33. Based on the characteristics, an ideal dosage for the tests called standard mixture was determined, it serves as a benchmark and based on it the performance of the other mixtures is quantified. The main objective of the project was to analyze the influence of recycled aggregates on the final strength of concrete, for which the realization of 12 types of mixtures with different components and quantities was defined, with 6 specimens of each. Destructive and non-destructive tests were used on the different concrete elements. The non-destructive test applied was the electrical resistivity, which indicates concrete quality parameters. For destructive tests, compressive strength and indirect tensile strength tests were performed. Curing times for the trials were considered 7, 14 and 28 days. The best performance of the recycled aggregates was that of the porcelain, defining as optimal dosage, which contains 30% natural coarse aggregate and 70% crushed porcelain. This mixture exceeded the final concrete strength of the standard mix reaching 373 Kg/cm2, unlike the other mixtures that reduced its strength by 15 to 40%. Qualitatively, the environmental alternatives contribute up to 60% in the necessary qualification for an environmental certification, and quantitatively it is possible to reduce 690.9 GJ of energy as well as reducing the emission of 47187 Kg of CO2e into the atmosphere.