Compósitos com biochar e carvão vegetal para camadas de pavimentos asfálticos

Abstract

Biochar is a charcoal derived from the carbonization of biomass under a low oxygen atmosphere. Its origin is due to the study developed in the so-called "Indian black earth", which considerably improves the agricultural properties of a soil. In the work under study the influence of biochar as a participant of composites with soil and asphalt mixtures is analyzed by means of the four point bending test. We also compare these results regarding the responses of the formulations with the presence of native charcoal from the Amazon region. For this, prismatic formations of natural clay soil (SN), soil-charcoal (SCV), soil-biochar (SBC), asphalt concrete (CA), asphalt-charcoal concrete (CACV) and concrete asphalt-biochar (CABC). The results showed that the biomass, which participates in composites with the clay soil, improved the stiffness properties, with the purpose of its use in base and sub-base of pavements, culminating in higher values for complex module regarding the mixtures with charcoal . Allus asphaltic composites with biochar and charcoal were verified for both values of stiffness inferior to the standard asphalt concrete, considering average temperature of 25oC. However, for the 40oC temperature, representative of the surface of the pavements of the city of Manaus, these formulations proved to be more advantageous in comparison to the concrete reference, conceiving an alternative for the achievement of road systems with better performance in the Amazon region.