Utilização do resíduo proveniente da serragem de rochas graníticas como filer no concreto asfáltico usinado a quente.

Abstract

The productive system extracts and uses Earth's natural resources in order to yield consumption products. In this context, marble and granite processing industries generate a residue composed of granalha (small iron particles added to lubricant water, white wash, granite powder and water. This muddy residue has no use and is thrown away, generating technical, environmental and economic concerns. It is estimated that Brazil, third in the world ranking of the sector, produces annualy 45,000,000 ton of the ornamental rocks, which increases in an annual rate of 6% (Poligram S.A.). The total residue volume becomes quite significant due to the fact that 20 at 25% of the block extracted from a quarry are reduced to power in the process of cutting it to 2 cm-thick sheets and surface sheet polishing. This than encouraged representatives of several quarry industries to seek a use to this residue, while at the same time reducing its negative environmental impacts. Based on granulomere, chemical and physical of this residue, its use as filler in hot mix asphalt concrete was studied. Marshall trial showed that the use of marble and granite power as filler, compared to two conventional filler material, white wash and portlan cement, provide satisfactory mechanical properties to the asphalt mixture, that can be used as top cover of flexible pavements without the necessity of increasing the agglutinating material level.