Study of synthetic calcinated clay aggregates behavior for use in pavement asphalt for Manaus / Estudo do comportamento de agregado sintético de argila calcinada para uso em revestimentos asfálticos para Manaus

AUTOR(ES)

Maria das Graças Rufino dos Santos

DATA DE PUBLICAÇÃO

2007

RESUMO

In regions as the City of Manaus, where the superficial stone material is scarce or is to be found only at long distances, and a thick clay superficial layer becomes present, the alternative for the manufacture of artificial aggregates, having the clay as raw material, it comes as alternative, beyond replacing the normally used granular material - the pebble mined from rivers bed. Initially, two soils (Soil 01 and Soil 02) were evaluated as to their potential for calcinations. Soil 01 was defined as more appropriate and had confectioned synthetic calcinated clay aggregates (ASAC). This material, together with the pebble, compose three types of asphalt mixtures (M1 with ASAC, M2 with crushed SCCA and M3 with pebbles), blended as the Marshall methodology. The synthetic aggregate (ASAC) was classified under C limits (DNIT) and within the Superpave (SHRP) limits to comprise the M1 and M2 mixtures, respectively. The alluvial material was used as comparative material a reference mixture used in Manaus, such mixture being classified under C limits and Superpave (M3), simultaneously. For the calculation of the volumetric parameters of the ASAC mixtures, the maximum theoretical density according to the Rice test was determined by taking into account their high absorption rate. For the pebble a weighed density average was performed, simultaneously. For the calculation of the volumetric parameters of the mixtures with ASAC, it was determined according to theoretical maximum density Rice method, in function of its raised absorption, and for the pebble the weighed mean of the densities was carried through. The asphalt mixtures are characterized by their mechanical properties obtained by their tensile strength tests by Brazilian Tensile Test (RT), resilient modulus (MR), creep dynamics and fatigue test. By and large, the mechanical performance of the asphalt mixtures made up with the synthetic aggregate proved more satisfactory than those made up with the natural material.

ASSUNTO(S)

engenharia civil material alternativo agregado sintético misturas asfálticas: ensaios dinâmicos

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