Representatives: Nicki Hosey and Briana McDermott

 Alternatives for Asphalt  Synthetic Asphalt  New Processes  More efficient mixing and milling units  In-line liquid mass flow meters  On-line monitoring systems  New safety equipment  Improvements  Modifiers  Control pavement rutting, cracking, asphalt oxidation, and water damage  Better Plants  Cleaner  Pavement warranties  More common

 Crude oil  Pumped into a distillation tower --> 370˚C.  Several hydrocarbons drawn by boiling points--virtually unusable otherwise  Oil vaporizes and rises up the tower  Vapor cools--molecules condense--heavier ones collecting at the bottom, lighter ones rising to the top.  Heaviest hydrocarbons  Highest boiling points, pulled from bottom of tower.  Lighter hydrocarbons  Pulled from higher locations as boiling points decrease.  Stream pulled from bottom --> “reduced crude” --> further distilled in vacuum distillation tower into asphalt and heavy gas oils.  Asphalt further processed for sale  Paving, roofing, industrial use.

 Two different types of plants --> different amounts of asphalt.  Batch Plants:  350 metric tons per hour  One batch (2-5.5 metric tons) --> seconds  Drum Mix Plants:  Anywhere from 100 to over 900 metric tons per hour, depending on drum design

 Emissions  Dust  Smoke  Sulfur Dioxides  Control/Prevention of Waste  Electrostatic Precipitators  Primary and Secondary Dust Collectors  Enclosures  Eliminates and increases heating efficiency of process

 Materials from old pavements reprocessed with new materials  Hot-Mix Recycling  Cold-Mix Recycling  Surface Recycling  Over 95 million metric tons of asphalt paving material is recycled each year.  America’s most recycled material

 Cost of Manufacturing in New England as of July 2012:  $75 per ton  Cost to Consumers in New England as of July 2012:  $147 per ton  Including crew and equipment costs, and installation.

 Must be kept hot to remain a liquid.  250°F and 350°F  Loaded into a truck, barge or rail--pipelines cannot be used over great distances due to temperature constraints  Heat transferred to surrounding environment  Convection, radiation  Asphalt surface temperature drops  Cooler surface insulates interior mass.  Air temperature, rain, wind, length of haul affect the characteristics and temperature of crust.

 More Efficient  Healthier for the Environment  Durable  Safe  Economic  Transportation

 Concrete  Cracking  Vulnerable to heat  Corrosion  Expensive  Non-recyclable

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