SLOAPCD RULE 420 CUTBACK ASPHALT PAVING MATERIALS
LAST REVISED 06/18/79
RULE 420. CUTBACK ASPHALT PAVING MATERIALS (Adopted 6/18/79)
A. Compliance Dates
1. After July 1, 1979, no person shall cause or allow
the use or application of rapid cure cutback
asphalt for highway or street or maintenance, nor
manufacture, sell or offer to sell cutback asphalt
for such use or application.
2. After July 1, 1980, no person shall cause or allow
the use or application of cutback asphalt for
highway or street paving or maintenance, nor
manufacture, sell, or offer for sale cutback for
use or application except as specified below:
a. Where the cutback asphalt is to be used
solely as a penetrating prime coat;
b. Where the National Weather Service official
forecast of the high temperature for the
immediate vicinity of the asphalt application
for the 24-hour period following application
is below 50oF (10oC);
c. Where the cutback asphalt is to be used for
highway or street paving or maintenance
purposes and the location of such use is a
minimum of 25 miles from the nearest
available commercial plant which produces and
offers for sale plant mixed surfacing
material.
3. In non-attainment areas after January 1, 1982, no
person shall cause or allow the use or application
of an emulsified asphalt containing petroleum
solvents (diluents) in excess of three percent by
volume or cutback asphalt for highway or street
paving or maintenance. These provisions do not
apply to cutback asphalt manufactured in this
District for shipment and use outside this
District.
If by January 1, 1981, there are no suitable
emulsified or slow cure asphalt alternatives
available at a cost comparable to existing
materials as approved by the APCD for uses listed
in the exception under A.2, then the January 1,
1982 date will be extended on a year-to-year basis
until such materials are available.
4. After January 1, 1982, road oils used for highway
or street paving or maintenance applications shall
contain no more than 5.0% of organic compounds
which boil at less than 500oF as determined by
ASTM D402.
B. Definitions
1. "Asphalt" means oil asphalt or a homogenous
mixture of refined liquid and solid asphalts
suitable for use in the manufacture of asphalt
concrete.
2. "Cutback asphalt" means paving grade asphalts
liquefied with petroleum distillate and as further
defined by American Society for Testing and
Materials (ASTM) specifications as follows:
Rapid CureType: ASTM D2028
Medium Cure Type: ASTM D2027
3. "Dust palliative" means any light application of
liquefied asphalt (cutback or emulsified asphalt)
for the express purpose of controlling loose dust.
4. "Emulsified asphalt" means any asphalt liquefied
with water containing an emulsifier. The two
kinds of emulsions most pertinent are the anionic
and cationic types.
5. "Penetrating prime coat" means any application of
asphalt to an absorptive surface to penetrate and
bind the aggregate surface and promote adhesion
between it and the new superimposed construction.
Prime coats do not include dust palliatives of
tack coats.
6. "Road oils" shall be synonymous with slow cure
asphalts.
7. "Tack coat" means any application of asphalt
applied to an existing surface to provide a bond
between new surfacing and existing surface to
eliminate slippage planes where the new and
existing surfaces meet.