Name: JÉSSICA FREIRE FONSECA
Type: MSc dissertation
Publication date: 15/06/2016
Advisor:
Name |
Role |
|---|---|
| JAMILLA EMI SUDO LUTIF TEIXEIRA | Advisor * |
Examining board:
| Name |
Role |
|---|---|
| JAMILLA EMI SUDO LUTIF TEIXEIRA | Advisor * |
| PATRÍCIO JOSÉ MOREIRA PIRES | Internal Examiner * |
Summary: 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.
Keywords: Ornamental Rocks, Fine Aggregate Matrix (FAM), Fatigue cracking,
Linear viscoelastic stiffness, Steel slag residue.
