SUSTAINABILITY IN THE CIVIL CONSTRUCTION INDUSTRY: USE OF CONSTRUCTION AND DEMOLITION WASTE IN THE MANUFACTURE OF ELECTRIC LAYING POSTS OF REINFORCED CONCRETE

Abstract

The construction and rehabilitation of buildings and urban infrastructures generate solid waste, which must be managed in order to guarantee their correct disposition, so as to mitigate the environmental impact. The use of Construction and Demolition Waste (CDW) in the manufacture of concrete is a common practice in developed countries, being an alternative to reduce the consumption of fine aggregate or cement. For this work, a pilot study was carried out on the addition of CDW in the production of concretes with moderate resistances for the manufacture of electric poles. For this purpose, the ABCP/ACI dosage Method (1980) was used, as a binder the cement CPII-Z-32, fine and coarse aggregate, and CDW as study material with 5 to 15% of proportion. This material, was evaluated in fresh state, through the slump tests and specific density, already in the hardened state, was analyzed the resistance to axial compression at 7, 14, and 28 days, and the indirect tensile strength and modulus of elasticity were tested at 28 days. In conclusion, the concretes developed with CDW presented resistances slightly lower than the concrete with conventional aggregates, being around 8.0% in the resistance to axial compression, 3.0% in the tensile strength and 10.0% in modulus of elasticity, however, the mechanical properties achieved are appropriate for use in precast concrete element.