STUDY OF SAND-ASPHALT MIXTURES WITH SAND FROM CONSTRUCTION WASTE AND DEMOLITION, AÇAÍ FIBER AND POLYMERS APPLIED TO THE CITY OF MANAUS, AM

Abstract

The pavements of the capital of Amazonas state, located in northern Brazil, particularize with early pathologies due to the geotechnical peculiarities of region, which cause the execution of the base and sub-base layers with clay material and sand asphalt. On the other hand the Amazon region is the largest producer of the fruit of açaí (Euterpe Oleracea), which contains seeds covered with fibrous tufts representing 90 % of the fruit, whose fibers will be used here in asphalt composite. Pertaining to the asphalt binder is measured at its modification by inclusion of copolymers of Ethylene and Vinyl Acetate (EVA) and of Styrene Butadiene (SBS). In this context, the study in question analyzed at the mechanical behavior of sand-asphalt mixtures with insertion of fiber of acai, use of asphalt-polymer and use of two sands, a residual (Manaus sand) and other originating from Waste Construction and Demolition (WCD sand), aiming to enable the use of materials of the region as technical alternative to urban roads. The results concluded: the fiber of açaí acted filling voids, the EVA polymer increased value of resilient modulus, the SBS polymer increased tensile strength, and the WCD sand presented high values of tensile strength and modulus of resilience. Keywords: Sand Asphalt, Açaí Fiber, EVA Polymer, SBS Polymer.