2.1.1.3
Crushed Slag
Crushed slag shall be an air-cooled blast-furnace product having a dry
weight of not less than 1120 kg per cubic meter, 70 pcf, and shall consist
of angular particles uniform in density and quality and free of dust and
foreign matter. The weight of a cubic meter foot of slag aggregate shall
be determined by ASTM C 29/C 29M.
2.1.2
Bituminous Materials
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NOTE: In some states and localities, the use of
cutback asphalt is prohibited or curtailed by local
air pollution regulations. In areas where cutback
asphalt is restricted by air pollution regulations,
asphalt cement or emulsified asphalt should be used.
Tar should generally be used only where the surface
course of the pavement is of tar concrete. Tar
grades are listed in order of preference for most
normal applications. RC-800 is most commonly
recommended for surface treatments. Where cooler
temperatures are anticipated, use of RC-250 may be
desirable. The type of cutback or emulsion to be
used will depend on local conditions and
temperature; and these factors must be carefully
considered in making the selection for surface
treatments. Where cooler temperatures are
anticipated, preference should be given to the use
of 200-300 grade asphalt cement.
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2.1.2.1
Cutback Asphalt
Rapid curing cutback asphalt shall conform to ASTM D 2028, Designation
[RC-250] [RC-800] [RC-3000].
2.1.2.2
Emulsified Asphalt
Rapid-setting emulsified asphalt shall conform to ASTM D 977, Grade RS-1 or
RS-2 or ASTM D 2397, Grade CRS-1 or CRS-2.
2.1.2.3
Asphalt Cement
Asphalt cement shall conform to ASTM D 946, Penetration Grade [120-150]
[200-300] or ASTM D 3381, Viscosity Grade [AC-2.5] [AC-5] [AC-10] [AC-20]
[AR2000].
PART 3
EXECUTION
3.1
SURFACE PREPARATION
Immediately before applying the first course of bituminous material, the
surface shall be cleaned of loose material with power brooms or power
blowers. Care shall be taken to remove all dirt, clay, and other loose or
foreign matter. Flush the surface with water, when necessary to achieve a
clean surface, only when directed by the Contracting Officer; allow the
surface to dry after flushing.
SECTION 02745
Page 13
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