Date post: | 23-Jan-2018 |
Category: |
Engineering |
Upload: | california-asphalt-pavement-association |
View: | 196 times |
Download: | 2 times |
1
CALAPA SPRING CONFERENCE
ONTARIO, CA
APRIL 21, 2016
Caltrans – HMA – up to 15%▪ No Fractionation
Caltrans – HMA - >15% <25% Fractionate RAP
Fine RAP = -3/8”
Coarse RAP = +3/8” -1”
May lower PG grade
2
– For Binder replacement >25% <40% - Fractionate Must lower PG grade
3
<15% RAP – >15% RAP – HMA mixture binder grade must
not be stiffer than the specified PG binder grade.
Use blending charts for high, intermediate and low critical temperatures.
4
We are still trying to figure this out. How do we design mixes in advance of actual
shipping. What changes can we make during
production How do we incorporate Rejuvenating agents
and other additives that effect the mix PG.
5
6
Viscosity Testing
Extraction/Recovery
RAP aggregate in Aggregate Blend – 25% JMF AC% TWM – 4.80 RAP AC% TWM – 4.81
Proposed RAP Binder Ratio - .250
7
AGING PROPERTY TEMP RANGE Virgin Binder(°C) RAP Binder(°C)
OriginalDSR G*/sin(delta), >1.00 kPa High 69 n/a
RTFODSR G*/sin(delta), >2.20 kPa High 69 96
PAV
DSR G*sin(delta), ≤ 5,000 kPa Intermediate 31 51
BBR Stiffness, "S" ≤ 300MPa Low -10 4
BBR m-value, m ≥ 0.300 Low -10 4
For Low Temp, enter True Grade values which are 10C lower than the test temperature. The plotted low test temp will be 10C higher than the True Grade.
Lowest "High" 69 96
Highest "Low" -10 4
PGActual (True Grade)
PG 69-10 PG 96+4
Equivalent M320 grade PG 64-10
8
* Projects Specified Binder Grade =>
PG 64-22
Proposed Virgin Binder Grade =>
PG 64 -10
"HMA Mixture Binder Grade" at Proposed RPBR => PG 75.8-6.5
9
10
11
RAP Processing
12
13
14
THANK YOU