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CE 4650 LECT. 17

Terms in this set (34)

what are the goals of compaction method?
- stimulate field densification
- accommodate large aggregates
- measure compactability
- conducive to QC
the superpave gyratory compactor records ___.
height
the superpave gyratory compactor is based on ___ equipment with ___ operational chracteristics.
- Texas
- French
the superpave gyratory compactor is usually ___ in diameter but can go up to ___ nominal size.
- 150mm
- 37.5mm
the mechanical mixer prepares specimen at ___ binder viscosity.
0.170 Pa∙s
for specimen prepartion, what is the time and temperature of short term oven aging for water aggregates at:
- water aggregate > 2%
- water aggregate < 2%
- 4hrs at 135°C
- 2hrs at 135°C
what are the specimen heights and masses for:
- mix design
- moisture sensitivity
- mix characterization/analysis
- 115mm, 4700g
- 95mm, 3500g
-140+mm, 5500g
what are the stages during sample compaction process?
- primary consolidation
- secondary consolidation
primary consolidation is the ___ stage of sample compaction process and requires ___ at Nini.
- construction
- %Gmm
secondary consolidation is the ___ stage of sample compaction and requires %Gmm at ___.
- end of life performance
- Nmax
Nini, Ndes, and Nmax is based on ___.
ESALs
Gmb (measured) is Gmb at ___.
Nmax
surface irregularities cause the volume of the specimen to be ___ than the volume of the cyclinder.
slightly less
Gmb (measured) is ___ than the estimated one.
higher
how can one determine the actual mixture bulk specific gravity?
use a correction factor
what is the correction factor?
C = Gmb (meas.)/Gmb (est.)
at Nmax
how is the correction factor used for Gmb?
Gmb (N, corrected) = C*Gmb (N, est.)
what are the parameters of superpave mixture requirements?
- mix volumetrics at Ndes
- mixture densification
- dust proportion
- moisture sensitivity
what are the mixture densifications?
%Gmm at Nini and Nmax
what is the dust proportion ratio?
% wgt. of - 0.075 material/% wgt. of effective asphalt
what is range of minimum VMA for superpave?
11%, 12%, 13%, 14%, & 15%

*notes for more details
what is the VFA requirements for superpave?
70-80% VFA
what are the %Gmm requirements at Nini & Nmax?
< 89% & <98%
on a %Gmm vs. Log gyrations plot, a steeper slope shows a ___ aggregate structure and vice versa.
stonger
%Gmm increases with ___ binder.
increasing
what is the mix requirement for dust proportion in superpave?
0.6-1.2
moisture sensitivity is measured on ___ & ___ and is based on ___.
- proposed aggregate blend & asphalt content
- tensile strength ratio
what is the mix requirement for moisture sensitivity?
80% minimum
what are the time and temperature required for short term aging during conditioning?
- for loose mix, 16hrs @ 60°C
- for comp mix, 72-96hrs @ 25°C
what are the two subsets required with equal voids during conditioning?
- dry
- saturated
conditioning includes an optional ___ and ___.
freeze cycle & hot water soak
what is the time and temp. for hot water soak?
24hrs @ 60°C
what is the tensile strength ratio and its spec?
TSR = wet/dry ≥ 80%
what is the tensile strength rate for conditioning?
51mm/min
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