Bitumen Flashcards
Derived from petroleum, used in waterproofing and cons, oldest known eng mat
Bitumen
Originates from greek word
Asphaltos
Capacity to bond with other surfaces
Adhesion
Withstand damaging effects of water
Resistance to water
Level of resistance to deformation under pressure
Hardness
Consistency and ability to flow
Viscosity and flow
Temp when bitumen becomes soft
Softening point
Capacity to stretch without breaking
Ductility
Density
Specific grav
Resistance to wear and weathering
Durability
Adaptability
Versatility
Cost effectiveness
Economical
Resistance to deformation of loads
Strength
Chemical comp
Mixtures of hydrocarbons with high molecular weight
Types of bitumen
Natural bitumen - overtime
Coal tar pitches - hard black substances
Petroleum asphalts - solid/semi from petroleum
Paving grade bitumen: is generally categorized
according to its penetration and viscosity, which
establish its appropriateness for various pavement
kinds and climates.
Modified
bitumen:
it
offers
improved
performance and durability over conventional
bitumen solutions
Cutback bitumen: Bitumen that has been blended
with a solvent to liquefy
Bitumen emulsion: it is a mixture of water,
bitumen (asphalt), and an emulsifying agent.
Effects of bitumen to health
●
Possible carcinogen
●
Skin Contamination
●
Inflammation in upper and lower airways
Purpose of bitumen
Road cons
Paving
Waterproofing
Insulation
Coatings and sealants
Industrial applications
Bitumen production process
Straight run - direct usage
Airblowing- oxidation process
Solvent deasphalting- addition of propane/butane
Blending - mixing
Types of test
Penetration
Viscosity
Softening point
Ductility
Spec grav
Solubility
Flash and fire point
Loss on heating
Spot test
Drop in penetration after heating
a process wherein the
crude oil is evaporated and the hydrocarbon chains
of
different
lengths
condense
at different
temperatures.
Fractional distillation
