CNST 202 ch3 - CNST 202 Chapter 3 Asphalt Asphalt Sources...

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CNST 202 2-12-08 Chapter 3 - Asphalt Asphalt - Sources Natural deposits of asphalt occur within porous rock, called “rock asphalt” “Bitumen” is a mixture of hydrocarbons that comprises “asphaltic cement” as a by- product of oil refining Virtually all asphalt in the US is produced by petroleum refineries Properties of asphalt Strong cement that is readily adhesive Highly waterproof and durable Plastic and imparts controllable flexibility Highly resistant to most alkalis, acids and salts Uses for asphalt Paving - highways, streets, driveways and parking lots Roofs Tennis courts, walkways and bike paths Joint sealer Curbs and roadway shoulders Pond lining Mix types Cold-laid - mixture is spread and compacted at atmospheric temperatures, used for temporary repairs of pavements Hot-laid - mixture is spread and compacted at elevated temperature, with both aggregate an asphalt heated prior to mixing Asphalt for paving Paving asphalt is highly viscous - adheres readily to aggregate particles and is excellent cement Aggregate portion of the mix carries the compressive load Asphalt resists the tension stresses Aggregates comprise 90-96% of the weight, and 65-85% of the volume Asphalt recycling Asphalt generally has lower removal and replacement costs due to common practices of recycling old pavements Recycling done either by “cold milling” or ripping-and-crushing
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  • Winter '08
  • Seillaf
  • Construction aggregate, Asphalt, Asphalt concrete, Liquid asphalt, Asphalt Institute, Asphalt recycling Asphalt

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