Codes Asphalts

Bitumen

Cementitious material of hydrocarbons, solid or semi-solid (viscosity), and softens when heated. DERIVED FROM PETROLEUM AND GREAT ADHERENCE AND WATER RESISTANCE.

What are some great uses of bituminous materials?

Roadways, roofing felt, roofing shingles, paints, caulking compound, and waterproof buildings below grade

How are Tars and Pitch made?

They are made from distillation of coal

What are they types of natural deposits for Asphalts?

Rock asphalt, native or lake asphalt, and petroleum asphalt derived from crude petroleum

How are petroleum asphalts made and what are the different types?

They are formed from distillation of petroleum, and they and be created from fractional distillation and destructive distillation

What are some uses for petroleum asphalts?

Flexible pavement, roof construction, insulation, water proofing, canal lining, and seal subgrade against water migration

What are the four main types of ashpalts?

Asphalt cement, cutback asphalt, emulsified asphalt, and air blown asphalt

What is Asphalt cement?

Very sticky, viscous, and is excellent for binding, adhesion, water proofing, and resisting chemical attacks

What are some characteristics of cutback asphalt?

less heat required prior to use, gradation is very important, solvent important for curing (rapid curing from Gasoline, medium from Kerosene, and slow curing with Diesel Oil)

What are some characteristics of emulsified asphalt?

Asphalt Cement + Water (12-15%), not normally blendable, applied in wet weather, better fuel demand, curing is important (particles can wash away), emulsifying agent can be clay or soluble chemicals

Characteristics of Air Blown Asphalt?

Blowing air through asphalt at the end of the distillation, non-ductile, weather resistant, stiff, and is not used for pavements.

What type of aggregate gradation is needed for softer asphalt?

Dense mix of aggregate, well graded

What gradation of aggregates is needed for harder asphalt?

open graded aggregate is needed

What does property consistency tell us in asphalts?

The fluidity at given temps, can vary from solid to liquid, no standard to measuring since temps effect different asphalts differently

What does property consistency tell us in asphalts?

Resistance to flow, higher viscosity leads to low deformation, and lower viscosity leads to high deformation (relative to water)

What does property penetration tell us in asphalts?

Its an indirect measure of consistency, penetration number measured in 0.1 mm increments (ex: 2.2 cm = 220)

What does property specific gravity tell us in asphalts?

Measured in a pycnometer, important for determining a void content (deals with specific gravity)

Which asphalt properties are temperature dependent?

Consistency, penetration, viscosity, and specific gravity