United States Department of Transportation
i
Evaluation of dynamic shear rheometer tests for emulsions.
-
2014-12-01
[PDF-3.99 MB]
Details:
-
Creators:
-
Corporate Creators:
-
Corporate Contributors:
-
Subject/TRT Terms:
-
Publication/ Report Number:
-
Resource Type:
-
Geographical Coverage:
-
Corporate Publisher:
-
Abstract:DSR-based rheological tests of 20 different
asphalt emulsion residues were
performed and relationships
with elastic recovery (A
ASHTO
T301) and force ductility (AASHTO T
300) were investigated. In stra
in sweep test from 2% to 52%
, it was observed that emulsions
prepared of hard pen base asphalt have rela
tively lower strain tolerances. Using fre
quency sweep data, complex modulus master c
urves
were constructed at 25°C to understand overa
ll rheological behavior. Temperature sweep
of phase angle from 52°C to 94°C showed
that a
maximum phase angle in the range of 75° to 85° may be used as
a criterion for polymer identification. MSCR (AASHTO TP70) at 58°
C
has been recommended to replace th
e elastic recovery test (AASHT
O T301). At 0.1kPa creep stress,
a minimum percent recovery of
25
and at 3.2kPa, a minimum percent recovery of
9 are recommended to identify the presence of polymer replacing elastic recovery t
est
(AASHTO T301). Also, percent recovery of MSCR and ph
ase angle can be used to
replace force ductility
requirements (AASHTO
T300). It is recommended that at 58°C, a maximum phase a
ngle of 81° and a minimum MSCR percent recovery (at 0.1kPa
creep stress) of 30 can be specified to
replace the force ductility
test (AASHTO T300). These criteria are applicable for
emulsion residues prepared according to the low temperature evaporative method specified in ASTM D7497. However, a
comparative study among ASTM D7497 (24 hr at 25°C and 24 hr at 60°C), ASTM D6934 (3 hr at 163°C), AASHTO TP 72
Method B (6 hr at 60°C), vacuum dry method (6 hr at 60°C, a method developed in this study) and field curing have been
performed in order to develop a low temperature low duration
recovery method. It was observed that the MSCR test on
residue prepared with the vacuum dried method can be used
for polymer identification replaci
ng elastic recovery and force
ductility tests. Finally, the current specification viscosity range for low and high viscous emulsions using the saybolt furol
viscometer to ensure quality control an
d quality assurance can also be replaced
by the rotational viscometer. The ranges
recommended are 220 - 730 cP and 5 – 90 cP (gives 98% probability) at 50 rpm and 30°C for high and low viscous
emulsions, respectively
-
Format:
-
Collection(s):
-
Main Document Checksum:
-
Download URL:
-
File Type:
