45_20071227_carl robertus wam foam wma twg

8/8/2019 45_20071227_Carl Robertus WAM Foam WMA TWG

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WAM Foam: asphalt pavements at

lower temperatures

WMA TWG, 12 December 2007, Hunt Valley - MD


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WAM Foam

Basic Concept & History

Field Experience

Emission Reduction

US Perspective


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100000

10000

1000

100

10

1

0.5

V 0.2

0.1

ViscosityPa.s

-60 32 120 210 300 390 480

F

Soft asphalt

component

Hard asphaltcomponentPG 64-22

Basic Concept

0 50 7525

Temperature


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DRYER MIXER SILO LAYING

DRYER MIXER SILO LAYING

TRADITIONAL HOT MIXASPHALT

WAM FoamASPHALT MIX PROCESS

6%ASPHALT

5% FILLER 20 OC

90% AGGREGATE

1.8 % SOFT

4.2 % HARDCOMPONENT

90% AGGREGATE

Schematics of the typical process conditions

390 OF 300-350 OF 270-320 OF

260 OF 225 OF 180-220 OF 175-200 OF

320 OF

5% FILLER 20 OC


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DG 11

PG 52-28

(180/220)

May

1999

1st WAM Foam 1999 (Norway)


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WAM Foam after two years

June 2001June 2001


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foam

mixer

2000

WAM Foam installation inHot Mix Asphalt plant


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Aggregate > 4 mm

Soft Bitumen

Aggregates 0-4 mm

Hard Bitumen Foam

Filler

Discharge

0 25 35 55Time (s) 5

-

Mixing

15

Mixing

Batch Plant Mixing Cycle 3.5 ton batch


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WAM Foam, DG 11, PG58-22

(80 pen)

May 2002

Reference, DG 11, PG58-22

(80 pen)May 2002

Field trials RV 120 September 2000


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Rut development on RV 120

Rv 20, Hp2, Km 6.823- 7.686, Length 0.863 km

Akershus

0

10

1

20

2

01

01

92

01

01

93

01

01

9

01

01

9

01

01

9

01

01

9

01

01

9

01

01

99

01

01

00

01

01

01

01

01

02

01

01

03

01

01

0

01

01

0

01

01

0

01

01

0

Date

Rutdepth(mm) 90 v lue

e n v lue

WAMAbg

3.2 mm/year 2.9 mm/r


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WAM Foam SMA 11,Track-paving on E6 - June 2002

Daily traffic 22000 vehicles - 65,2 kg/m2


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Adoption to Drum Mix Plant


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Emission

measurements

Source: Koenders et al, IRF 2004

Asphalt Fume Emission monitoring


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Emission reduction Hot Mix WAM Foam

TPM = Total Particulate Matter BSM = Benzene Soluble Matter

TPM BSM

0

0,2

0,4

0,6

0,8

1

1,2

mg

/m

3

1 2 1 2

Location

PLEASENOTE:

Today typical Occupational

Exposure Limits in Europeand US are

TPM 5 mg/m3

In this example

Hot Mix emissions are still

4 times lower

than OE limit !!

Fume emission measurement

Source: Koenders et al, IRF 2004


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Measu e en s pe o ed by De No ske Ve i as

a Ska nes 26 27/08 2002

0

500

1000

1500

2000

2500

3000

3500

[kg/h]

WAMFoa MA

31,5

CO2

CO2 emission during actual Production


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Measu e en s pe o ed b e o ske Ve as

a Ska nes 26 27 08 2002

0

20

40

60

80

100

120

140

O Ox 1/100as pe

[kg/]

M Foa MA

- 61 5 %

- 28 5 %

NOx and CO emission during actual Production


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1

1

Dust[kg/hour

WA Foam H A

Skarnes

Dust54% reduction54% reduction

Production process

Dust emission during actual Production


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311rF 230 rF

Illustrations


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Illustrations

HMA WAM Foam

329 rF

230 rF

vs.


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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


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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 ?


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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

45_20071227_carl robertus wam foam wma twg

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