Background
The quality and service life of an asphalt mixture depends largely on the strength and stability of the bitumen-aggregate adhesion. Inadequate adhesion results in typical instabilities such as crumbling, stripping, raveling, pothole development, and a reduction in tensile strength.
Organosilane-based technologies have been used to improve the bitumen-aggregate interface, but their use has been limited due to the decreased hydrolytic stability of these composites at elevated temperatures and the self-condensation reaction of organosilanes. Bitumen emulsifiers are essential to repair and seal the top surfaces of existing roads, roof shingles, and bridge decks. There is a need for bitumen modifiers & emulsifiers that can be used effectively at a wide range of weather conditions and without having destructive effects on the other properties of bitumen.
Invention Description
Researchers at Arizona State University have developed a multi-functional modifier (MIBA) to improve sustainability at the interface of bitumen and aggregate. This technology uses organosilane and environmentally friendly bio-oils to guarantee both the adhesive and cohesive properties of a bituminous mixture due to the increased effective intermolecular interactions. This type of modifier can also be used as a bitumen emulsifier for applying with tack coat or for microsurfacing.
Potential Applications
- Bitumen modifier (anti-stripping, anti-aging, or peptizing agent) in construction of roads, roof shingles, or bridge decks
- Application with tack coat to repair and seal existing asphalt surfaces
- Bitumen emulsifier
Benefits & Advantages
- Moisture-resistant (effective in both wet and dry conditions)
- Cohesive & adhesive properties
- Environmentally friendly modifiers (non-hazardous)
- Cost-effective (bio-oil is derived from waste biomasses)
- Peptizing effect of bio-oil delays bitumen aging
Related Publication: Enhanced sustainability at the bitumen-aggregate interface using organosilane coating technology