000			01782nab a2200181 4500
005			20260520001747.0
008			260224s2009 xxu
245	0	0	_aThe influence of different minerals on the mechanical resistance of asphalt mixtures
260			_a _b _cabril. 2009
270			_a2009-05-11 ; 2009-05-11
300			_a4 p. ; 171-174
520			_aResumen publicado por el autor: The adsorption of five asphalts processed in Brazilian refineries and designated as A, B, C, D and E, and their asphaltenes and maltenes constituents, from toluene solutions, onto quartz, feldspar and biotite and the relationship between this tendency and the mechanical properties of the asphalt pavement have been investigated. For all minerals asphalts A and C strongly absorbed the others. Their respective curves levelling off between 3.5 and 4.0 mg g- 1 for gneiss and quartz, increasing to 5 and 6 mg g- 1 for feldspar and biotite. The eletrophoretic mobility of quartz was not modified by the adsorption of asphaltenes in contrast to that observed for feldspar and biotite, indicating that the sites liable for the surface charge of the latter minerals were affected by the presence of the adsorbed organic species. Regarding the mechanical resistance tests for asphalt mixtures, only asphalts A and C gave that would be considered values acceptable by the Brazilian National Department of Terrestrial Infra-structure (DNIT) (> 80%). Those results indicate that the chemical interaction among minerals and asphalts should affect for good or bad the mechanical resistance of the asphalt mixture
581			_a3-4
773	0		_tJournal of Petroleum Science & Engineering _g65
942			_cARTICULO
100	1		_aRibeiro, Roberto Carlos _941123
999			_c169723 _d169723