Innovative Approach to Antistrips Using Organo-Silane Nanotechnology
This innovative approach utilizes Organo-Silane Nanotechnology to prevent the stripping effect in asphalt coatings, enhancing surface wetting and creating chemical bonds on aggregate surfaces. Organo-Silanes are designed to customize performance, ensuring asphalt-loving and stable surfaces, resulting in efficient and environmentally friendly benefits.
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Presentation Transcript
An innovative An innovative approach to approach to antistrips antistrips Organo-Silane Nanotechnology
Stripping Effect Asphalt Coating OH OH OH OH OH OH OH Si Si Si Si Si Si Si -OH groups make surface very hydrophilic (water loving) Particle surface O O O O O O O O O O O O O O O O Si O Si Si Si O Si Si Si O O O O O O O O O Untreated Stone / dust/ dirt/ aggregates O O H O O H O O H O O H O O H O O H OH OH OH OH OH OH OH Water seeps onto aggregate surface changing the charge Si Si Si Si Si Si Si Particle surface O O O O O O O O O O O O O O O O Si O Si Si Si O Si Si Si O O O O O O O O O
How do conventional antistrips work? Improves wetting of asphalt to aggregate surface Association- Hydrogen bonding O H O H O H O H O H O H O H OS iOS iOS iOS iOS iOS iOS iO O S i O O O O O S i O O O O O O S i S i S i O S i S i O O O O O O Untreated Stone / dust/ dirt/ aggregates O H O H O H O H O H O H O H OS iOS iOS iOS iOS iOS iOS iO O S i O O O O O H O H O H O H O H O H O H O S i O O O O O O S i OS iOS iOS iOS iOS iOS iOS iO O S i O O O O S i S i O S i S i O O O O O O S i O O O O O O O S i S i S i O S i S i O O O O O O
Organo-Silanes: Nanotechnology Designed/engineered organic group to customize desired performance Silane group for chemical bonding to aggregate surfaces SI O O O
Chemical Action The Alkyl Siloxane nano layer ensures that the surface is asphalt loving Alkyl Group Dissolved in the Asphalt Asphalt Coating on Aggregate Permanent Chemical bond 4 - 6 nm Alkyl Siloxane surface O O O O O O O O Si Si Si Si Si Si Si O O O O O O O O O O O O O Si Si Si Si Si Si Si Aggregate surface O O O O O O O O O O Internal Siloxane bonds O O O O O O Si O Si Si Si O Si Si Si O O O O O O O O O Organo- Silane Treated
Organosilane Nanotechnolgy Creates asphalt loving surfaces Forms Si-O-Si bond on aggregate surface which is oil loving and very stable X X H O SiO Si OO
Organo Silane Benefits Efficiency Chemical Bond Heat Stable Environmentally friendly
Organo Silane Benefits- Efficiency Organosilane Traditional Antistrips 0.05-0.10% by weight of asphalt cement 0.25-0.75% by weight of asphalt cement 3-6 gallon per 6000 gallon tanker load 15-30 gallon per 6000 gallon tanker load
Organo Silane Benefits- Permanent Chemical Bond O O O O O O O O Si Si Si Si Si Si Si O O O O O O O H O H O H O H O H O H O H O O O O O O O OS iOS iOS iOS iOS iOS iOS iO O S i O O O O Si Si Si Si Si Si Si O O O O O O O O O S i O O O O O O O O O O O O O Si O Si O S i Si S i Si O Si Si S i O S i S i Si O O O O O O O O O O O O O O O 6 Hour Boiling Stripping Test 15 Minute Boiling Stripping Test
Organo Silane Benefits- Heat Stable SI O O O Stable in liquid asphalt storage for a weeks
Organo Silane Benefits- Environmentally Friendly No odor Non corrosive (pH 6.5-8.0) Inflammable (flash point 80 degrees C) No placarding required (non hazardous)
Other Benefits to Organo Silane Nanotechnology At higher dosages (0.1-0.2%) other performance features are demonstrated Coating Aid Equipment cleanliness and lower maintenance Mix flow/transfers Mix workability/compaction aid
Benefits- Coating Aid As the organosilanes react to aggregate surfaces all sizes and mineralogy of aggregates appear the same to the asphalt- speeds up and makes uniform coating of aggregate 100% coating even with high RAP/RAS blends Blacker/glossier appearing mixes Maintains the coating/black color under traffic conditions
Benefits- Equipment Cleanliness Reduces adhesion to metal surfaces Drum flights not coated Elevator lifting stakes cleaner Paver cleaner
Benefits- Mix Flow and Transfers Mix flows more smoothly and more homogeneous during transfers Smoother transfer of mix into paver Reduced fat spots for SMA/open graded mixes
Benefits- Workabililty/Compaction Aid Organosilanes also works on the surface of the asphalt coating to improve workability and compaction Improved hand work time Aids compaction: valuable for long hauls, paver delays, or late/early season work
Summary: Green Roads Organo-Silanes Normal dosage Efficient- low dosage for antistrip Chemical bond to aggregate surface Heat stable- long storage life in AC Environmentally friendly- no odor, non-corrosive, non- flammable, no placarding Higher dosage Coating aid Equipment cleanliness/lower maintenance Mix/flow transfers Workability/Compaction Aid
