USO DE LODO DE CARBONATO DE CALCIO COMO FILTRANTE EN HORMIGÓN ASFÁLTICO MECANIZADO EN CALIENTE

Using industrial solid waste in the composition of asphalt mixtures can provide economic and environmental gains for the generating sector and civil construction. This work evaluated the feasibility of using calcium carbonate sludge as a filler material in producing hot-mix asphalt concrete. The methodology was based on current standards, using a reference trace based on the Marshall dosage to measure the ideal content of petroleum asphalt cement and replacing three levels (2%, 3% and 4%) of stone dust with carbonate calcium sludge in the mixtures. The stability and creep parameters results did not show a statistically significant difference despite the increase in resistance (1394.41 kgf) and lower deformation (3.48 mm) using 3% residue compared to the reference mixture. On the other hand, the values for the percentage of voids and the bitumen-void ratio showed statistical differences, reaching values of 5.29% and 69.86%, respectively, with the incorporation of 3% of the sludge. It was concluded that there is a possibility of reducing petroleum asphalt cement in the composition of the mixtures and a potential for using this residue as a filler in hot-mix asphalt concrete.