Using Polymer Modified Asphalt Emulsions in Surface Treatments A ...

Modified Emulsion (PME) slurry, and conventional slurry emulsions. Aggregate
and mix design guidelines should be adjusted accordingly for these three distinct
uses. Preliminary information on aggregate quality guidelines was provided by
Fugro on the CALTRANS study for slurry seals and microsurfacing. These data
are compared to both the ISSA guidelines and existing FLH specifications in
Tables 16 and 17.
Table 16: Comparison of Slurry Seal Aggregate Quality Specifications
Test Method FLH ISSA
General
Los Angeles
abrasion,
AASHTO T 96
Sand
equivalent
value,
AASHTO T
176, alternate
method no. 2,
reference
method
Smooth
textured sand
with < 1.25%
water
absorption
content by
weight of total
combined
aggregate
Soundness,
AASHTO T104
Polishing
Furnish natural or
manufactured sand,
slag, crushed fines,
or other mineral
aggregate
conforming to
AASHTO M 29 and
the following:
The mineral aggregate used shall be
the type and grade specified for the
particular use of the slurry seal. The
aggregate shall be manufactured
crushed stone such as granite, slag,
limestone, chat, or other high-quality
aggregate, or combination thereof.
To assure the material is totally
crushed, 100 percent of the parent
aggregate will be larger than the
largest stone in the gradation to be
used.
35% max. 35 % max.
Abrasion test run on aggregate
before it is crushed
FUGRO / CALTRANS
Study
30% max. high traffic
35% max. low traffic
45 min. 45 min. 45 min. low traffic
65 min. high traffic
50% max.
15% max using Na 2SO 4
25% max using MgSO 4
Meet approved polishing values
Gradation See below See below See below
20% max using MgSO 4
95