University of Virginia Library

BITUMINOUS MATERIALS:

1.

• Requires soils analysis to determine thickness of pavement.

2.

• Asphalt Institute establishes various thickness and spec for
  soils.

3.

• Low Type Bituminous: for wheel loads up to 7000 pounds; life
  up to two years; requires annual seal coat; low cost, high
  maintenance; surface treatment less than 1″ thickness;
  "prime and seal coat: Armor coat"

4.

• Calculate thickness according to Seelye table for "design of
  flexible pavements"; design curves are by Asphalt Institute;
  soils are classified by USDA or USCE

5.

• Selection of Bituminous Material depends largely on temperature!

               

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  RT-1 is 60° to 125°	(RT = Road Tar)
  RT-12 is 175° to 250°
  RTCB is 60° to 120°	(RTCB = Road Tar Cut Back)
  SC-0 is 50° to 120°	(SC = Slow Curing Road Oil)
  SC-6 is 400° to 400°
  MC-0 is 50° to 150°	(MC = Medium Curing Cut Back Asphalt)
  MC-5 is 200° to 275°
  RC-0 is 60° to 125°	(RC = Rapid Curing Cut Back Asphalt)
  RC-5 is 200° to 250°
  SS-1&2 is 50° to 120°	(SS = Slow Setting Asphalt Emulsion, AE)
  MS-1 is 60° to 120°	(MS = Medium Setting Asphalt Emulsion, AE)
  RS-1 is 80° to 135°	(RS = Rapid Setting Asphalt Emulsion, AE)

  Asphalt Cement Penetration is hot application from 275° to 400°
  (the higher the number the more viscous the material)

6.

• Types of Pavement:

           

  Type 1		Open type pavement, penetrating macadam, hot or cold, plant mix or road mix of crushed stone and bitumen (coated aggregate)
  Type 2		Dense Mats, mixed in place, plant mix or road mix, aggregates graded coarse to flue and bitumen
  Type 3		Dense graded pavement - Bituminous Concrete, plant mix of aggregates graded coarse to fine with minerals
  Type 4		Dense graded sand pavements, Sheet Asphalt, Plant mix of sand passing #10 to #200 mesh, minerals
  Type 5		Dense Sand Mat, Sand Asphalt, plant mix or mixed-in-place sand passing #4 mesh and bitumen

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