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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.

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wam foam asphalt pavements at lower temperatures

WAM Foam:asphalt pavements at lower temperatures

WMA TWG, 12 December 2007, Hunt Valley - MD

wam foam
WAM Foam
  • Basic Concept & History
  • Field Experience
  • Emission Reduction
  • US Perspective
basic concept
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
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

1 st wam foam 1999 norway

May 1999

DG 11

PG 52-28

(180/220)

1st WAM Foam 1999 (Norway)
wam foam installation in hot mix asphalt plant
WAM Foam installation in Hot Mix Asphalt plant

2000

Original asphalt line

foam

mixer

New, 2nd asphalt line

batch plant mixing cycle 3 5 ton batch
Aggregate > 4 mm

Soft Bitumen

Aggregates 0-4 mm

Hard Bitumen Foam

Filler

Discharge

Batch Plant Mixing Cycle – 3.5 ton batch

5

15

25

Time (s)

0

55

35

Mixing

Mixing

-

field trials rv 120 september 2000
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
WAM Foam SMA 11, Track-paving on E6 - June 2002

Daily traffic 22000 vehicles - 65,2 kg/m2

asphalt fume emission monitoring
Asphalt Fume Emission monitoring

Emission

measurements

Source: Koenders et al, IRF 2004

fume emission measurement

Emission reduction

Hot MixWAM Foam

Fume emissionmeasurement

PLEASE 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

illustrations
Illustrations

230 F

311 F

illustrations19

230 F

329 F

Illustrations

HMA

vs.

WAM Foam

what has been we achieved with wam foam
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
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 perspective22
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