Mobility Compass

• Vassallo, Jose Manuel
• Gallego, Juan
• Castro, Maria Claudia Ferrari De
• Prieto, Jorge N.

Abstract

The most usual asphalt mix applied for thin overlays on Spanish roads is produced with a gap-graded combination of aggregates and a polymermodified binder. Nevertheless, reflective cracking usually affects the overlay so that the surface of the pavement soon begins to reveal a network of cracks. The brittleness and aging of asphalt mixes at low temperatures encourage the appearance and progress of these cracks. Asphalt mixes incorporating rubber from discarded tires are believed to control reflective cracking well. This paper presents a study performed on five gap-graded asphalt mixes, three containing rubber from tire waste. Every mix was tested at two stages of aging in accordance with the laboratory-accelerated aging processes proposed by SHRP. Dynamic moduli at several temperatures, ranging from -15°C to 40°C, and the fatigue life of each mix at 20°C were measured. The results are provided to help researchers build realistic models for studying reflective cracking as a function of the actual character...

Topics

• researcher
• structural engineering
• mechanical engineering
• sidewalk
• asphalt
• tire
• waste product
• laboratory
• binder
• composite material
• aggregate
• sensitivity
• service life
• low temperature
• natural rubber
• reflection cracking
• crumb rubber
• reclaimed rubber
• brittleness
• bituminous overlay

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