Download
Skip this Video
1 / 22
WAM Foam: asphalt pavements at lower temperatures - PowerPoint PPT Presentation
- 207 Views
- Uploaded on
WAM Foam: asphalt pavements at lower temperatures. WMA TWG, 12 December 2007, Hunt Valley - MD. WAM Foam. Basic Concept & History Field Experience Emission Reduction US Perspective. Basic Concept . Hard asphalt component. PG 64-22. Soft asphalt component. Viscosity. Pa.s. 100000.
Download Presentation 
An Image/Link below is provided (as is) to download presentation
PowerPoint Slideshow about 'WAM Foam: asphalt pavements at lower temperatures' - dreama
An Image/Link below is provided (as is) to download presentation
Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.
While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.
- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
WAM Foam:asphalt pavements at lower temperatures
WMA TWG, 12 December 2007, Hunt Valley - MD
WAM Foam
- Basic Concept & History
- Field Experience
- Emission Reduction
- US Perspective
Basic Concept
Hard asphalt component
PG 64-22
Soft asphalt component
Viscosity
Pa.s
100000
10000
1000
100
10
1
0.5
0.2
0.1
300
210
-60
32
120
390
480
25
50
75
0
°
F
Temperature
Schematics of the typical process conditions
TRADITIONAL HOT MIX ASPHALT
5% FILLER 20 OC
90% AGGREGATE
DRYER
SILO
LAYING
MIXER
270-320 OF
300-350 OF
320 OF
390 OF
6% ASPHALT
WAM Foam ASPHALT MIX PROCESS
5% FILLER 20 OC
90% AGGREGATE
DRYER
MIXER
SILO
LAYING
260 OF
180-220 OF
225 OF
175-200 OF
1.8 % SOFT
4.2 % HARD COMPONENT
WAM Foam after two years
June 2001
WAM Foam installation in Hot Mix Asphalt plant
2000
Original asphalt line
foam
mixer
New, 2nd asphalt line
Aggregate > 4 mm
Soft Bitumen
Aggregates 0-4 mm
Hard Bitumen Foam
Filler
Discharge
Batch Plant Mixing Cycle – 3.5 ton batch5
15
25
Time (s)
0
55
35
Mixing
Mixing
-
Field trials RV 120 September 2000
WAM Foam, DG 11, PG58-22
(80 pen) May 2002
Reference, DG 11, PG58-22
(80 pen) May 2002
WAM Foam SMA 11, Track-paving on E6 - June 2002
Daily traffic 22000 vehicles - 65,2 kg/m2
Hot MixWAM Foam
Fume emissionmeasurementPLEASE NOTE:
Today typical Occupational Exposure Limits in Europe and US are
TPM – 5 mg/m3
In this example
Hot Mix emissions are still
4 times lower
than OE limit !!
TPM
BSM
Source: Koenders et al, IRF 2004
TPM = Total Particulate Matter BSM = Benzene Soluble Matter
What has been we achieved with WAM Foam?
- 30 % reduction in energy consumption, lower production costs
- 30 % reduction in CO2-emissions, a gain for the environment!
- 50 – 60 % reduction in dust emission, again a gain for the environment
- Fume from WAM Foam is below detection limits,Health & Safety!
- Reduced temperature => reduced oxidation/ageing of binder
- WAM Foam satisfies all Hot Mix Asphalt specifications according to Handbook 018 (Norwegian Standard)
- Production Capacity maintained
US Perspective
- Binder components now available in the US
- Final binders: PG 70-22, PG 64-22, PG 58-28
- Laboratory
- 2007 mixing trials at Turner Fairbank / FHWA
- 2007 evaluation at NCAT
- Included in study Industry tour 2007
- Further US field verification 2008
- Mid West
- Expand to modified grades ?
US Perspective
Positives (when compared to other WMA):
- No Additives, no expensive snake oils – “just add water”
- Pre-coats Coarse Aggregate
- Absorptive Aggregates
Challenges:
- Paradigm Shift
- Asphalt Plant Binder Blending
- PG Binder Grading system
- Performance Acceptance Projects
- Mix Design-Lab Foaming device
- Asphalt Plant Modifications
