Efeitos do resíduo de beneficiamento de rochas ornamentais e escória de aciaria como fíleres na rigidez viscoelástica linear e características de fratura da matriz de agregados finos
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Data
2016-06-15
Autores
Fonseca, Jéssica Freire
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Universidade Federal do Espírito Santo
Resumo
The most common problems in asphalt pavements are fatigue cracking and rutting that may occur even before the pavement reaches its projected service life. These distresses are related to a small scale phenomenon, such as micro cracks, stress concentration at the interface between aggregates and asphalt binder, and energy dissipation due to binder viscoelastic behavior. The main objective of this study was to evaluate the potential use of Ornamental Rocks Fine By-Products (RBRO) and Steel Slag Residue (EMA) as filler materials on the fine portion of asphalt mixtures, known as Fine Aggregates Matrix (FAM). To achieve this goal, five different types of FAM mixtures were fabricated by replacing: 2% as filler of RBRO, 2% as filler of EMA, 2% as filler of RBRO+EMA, 2% as filler of hydrated lime and the control mixture. The effects of those materials on FAM were investigated by performing Frequency Sweep Tests (FS) to evaluate linear viscoelastic stiffness characteristics, Semi-Circular Bending Tests (SCB) and Time Sweep Tests (TS) to evaluate fracture characteristics. Thus, it was obtained a better understanding of the influence of type of filler (RBRO and EMA) on the FAM viscoelastic properties, by analyses of complex modulus and phase angle master curves and FAM damage characteristics, by analyses of fracture energy and damage characteristics curves (C x S). The results, in general, presented a better performance of FAM RBRO+EMA, for both fracture and linear viscoelastic stiffness characteristics, and this tendency was observed by others authors works using same residues. Therefore, it could be concluded that the application of RBRO+EMA in asphalt concrete presents viable from environmental point of view as well as technological.