31 Dec 96
RESIN MODIFIED PAVEMENT (RMP) MIX DESIGN METHOD
Open-Graded Asphalt Concrete.
(1) Gather representative samples of aggregates and
asphalt cement. Sample aggregates according to American Society
for Testing and Materials (ASTM) D 75 and asphalt cement
according to ASTM D 140. An open-graded asphalt concrete mix
design requires a minimum of 45 kg of each aggregate stockpile
and 15 L of asphalt cement.
(2) Oven dry aggregate stockpile samples and conducts a
sieve analysis (ASTM C 136) on each sample. Determine the
combination of aggregate stockpiles that results in a gradation
closest to the center of the limiting gradation band specified in
CEGS-02548. This stockpile combination will become the blending
formula for the open-graded asphalt concrete.
(3) Ensure that the aggregates representing the selected
stockpiles and the asphalt cement meet the quality requirements
as detailed in CEGS-02548. Measure apparent specific gravity of
aggregates (ASTM C 127 and C 128) from each stockpile used in the
final gradation. Calculate apparent specific gravity of combined
aggregates using the blending formula percentages. Measure
specific gravity of asphalt cement (ASTM D 70).
(4) Estimate the optimum asphalt content using the
Optimum asphalt content = 3.25(")E0.2
" = 2.65/SG
SG = apparent specific gravity of the combined aggregates
E = conventional specific surface area
= 0.21G + 5.4S + 7.2 s + 135f
G = percentage of material retained on 4.75-mm sieve
S = percentage of material passing 4.75-mm sieve and
retained on 600-m sieve