Akzo NobelRedisetTM Warm Mix Solutions

‘‘Warm Mix Addressing MoistureWarm Mix Addressing MoistureSensitivitySensitivity’’

Patents pending:Patents pending: PremPrem NaidooNaidoo, S., S. LogarajLogaraj& A. James.& A. James.

Akzo Nobel RedisetTM wmx SolutionsMain Focus

• Reducing mix and paving temperatures

– To improve mix workability

• Addressing moisture damage in warm-mix

– Inefficient aggregate drying at lower temp

– Low temperatures being pushed to extreme limit

• Maintain PG Integrity of Binder

• Cost Effective Solution

Mechanism of Moisture DamageAdhesion and Cohesion

Aggregate

Asphalt

Moisture Damage

• Adhesion failure

– Water has a higher affinity for aggregate comparedto asphalt

– Asphalt cannot bond to aggregate with a wet surface

• Cohesion failure

– Inclusion of water within asphalt will weaken it’scohesive strength

Moisture Damage Survey*Do You Treat HMA for Moisture Damage?

PredominantType of TreatmentUsed

LimeLime or liquidsLiquidsLiquids seldomNo or very rarely

*Tim Aschenbrenner, Moisture Damage Symposium, San Diego, 2003

Akzo Nobel RedisetTM wmx Solutions

• Testing at NCAT

– Densification, Moisture Damage

• Hamburg Wheel Tracking Tests

• PG test results with warm-mix additive

• Effect of RedisetTM wmx confirmed

• Field Trial, Chico, CA

• Dallas, TX Trials.

Compaction Test Results - NCATVibratory Compactor

4

4.5

5

5.5

6

6.5

7

300 F 270 F 240 F

Compaction Temp.,

%A

irV

oid

s

Control

wmx 7001

wmx 7002

PG 76-22 AsphaltSuperpave coarse graded granite mix (12.5 mm max)

Moisture Sensitivity Test Results - NCATTensile Strength Ratio*

Warm-Mix

Additive

Conditioned

Tensile Strength

psi

Unconditioned

Tensile Strength

psi

Tensile

Strength

Ratio

WMX 7001 74.7 79.4 0.94

WMX 7002 74.2 83.7 0.89

* Compacted at 270oF

PG 76-22 AsphaltSuperpave coarse graded granite mix(12.5 mm max)

Moisture Sensitivity Test Results - NCATHamburg Wheel Tracking Test*

Mix Type AirVoids

, %

Comp.Temp., F

Strip. Infl.Point,cycles

Total Rutting@ 10,000

cycles, mmWMX 7001 #1 7.2 270 > 10,000 5.15WMX 7001 #2 7.0 270 > 10,000 6.62WMX 7002 #1 7.0 270 > 10,000 4.73WMX 7002 #2 7.0 270 > 10,000 3.77

* Compacted at 270oF

PG 76-22 AsphaltSuperpave coarse graded granite mix(12.5 mm max)

Texas Hamburg Wheel Tracking TestAPAC 76-22 Asphalt

250 F

250 F

300 F

Comp.Temp.

12.4029,9756.82.0WMX 7002-B

12.3229,9006.82.0WMX 7001-A

<12.5>20,0007.10.75Control + LAS

Deform,mm

Cyclesto failure

% AirVoids

Additive%

Material ID

Type D Surface, Design #7-MMD-05Hamburg Test Temp 50 CA= Added to binderB= Added to aggregate mix

Hamburg Wheel Tracking TestLime comparison – PaveTexNote: Lime % of mix vs Rediset™ WMX % binder

Mix Composition: BR 710 Ty D

5.2% Alon Big Springs PG 70-28

Material Mix Additive, Test Cycles Deform,

ID Type % Temp,C0 To mm

Failure

Control D 0.0 50 18,177 12.50

Hydrated Lime D 2.0 50 20,000 3.50

WMX 7019 D 2.0 50 20,000 2.93

25,000 3.19

30,000 3.41

WMX 7020 D 2.0 50 20,000 3.50

25,000 3.50

30,000 3.66

Hamburg Wheel Tracking TestLime comparison – PaveTexNote: Lime at 2% mix vs Rediset™ at 2% binder

0

2

4

6

8

10

12

14

Deform, mm

Rut Depth at ~20,000 Cycles

Control

Hydrated Lime

WMX 7019

WMX 7020

PG Testing Results

72.070.2073.8Original Binder, Phase Angle @76º C, Degrees

0.3440.3420.316BBR, Slope m-Value @ -12º C

140144185BBR Creep Stiffness, S, @ -12º C

2.252.272.49RTFOT G*/Sin d (kPa) @ 76ºC

1.031.051.17G*/Sin d (kPa) @ 76º C

PG 76-22 +2%

WMX 7002

PG 76-22 +2%

WMX 7001

PG 76-22Test

RedisetTM wmx

• Solid Additive – Pastilles

• Added to the asphalt

• Also can be added to the mix at the hot-mix plant

RedisetTM wmx FunctionImprove mix workability

• Reduce viscosity of asphalt andhot-mix

• Reduce surface tension of asphalt

• Easier to coat the aggregate andeasier to compact

– Reduce mix and compactiontemperatures

RedisetTM wmx - FunctionIncrease resistance to moisture damage

• RedisetTM modified asphalt hashigher affinity to the aggregatecompared to water

• Displaces water from the aggregatesurface and form bonds

• Acts as a bridge holding asphalt andaggregate together

• Bonds resistant to the action of water

• Additive increases cohesive strength ofasphalt

Warm-Mix TrialChico, CA - November 13, 2007

• Kent’s OilSacramento, CA

• Baldwin ContractingCompany, IncChico, CA

• Knife River Companies

• Akzo Nobel SurfaceChemistry LLC

Warm Mix Trial at Chico, CA

1. Pug mill Amps

2. Field Densities

3. Qualitative assessment of fumes

64-10 Asphalt +

2% RedisetTM WMX

64-10 Asphalt +

2% RedisetTM WMX

64-10 Asphalt

270oF Warm Mix240oF Warm Mix300oF Control Mix

Kent’s OilBlending into the asphalt tank

Reviewing plans for the trial

Tack Coat

Control Room

Warm Mix

Windrow paving

Paving 240oF Mix (Average Temp.)

Compaction

After first pass of roller

Control 300oF Mix

240o F and 300o F Mixes

Pug mill Amperage

120-125120-125135-140Pug millAmps

300oF

(Control)

270oF240oFAverage

Mix Temp.,

Density measurements

Warm Mix Trial Chico, California% Relative CompactionCT 308A Method

90.2%2.275300oF Mix (Ave.)

Control

92.3%2.329270oF Mix (Ave.)

RedisetTM WMX 2%

91.9%2.319240oF Mix (Ave.)

RedisetTM WMX 2%

%RC RiceCore Density

(bulk)

Type of Mix

PG 64-10 Asphalt Mix

Warm Mix Trial Chico, California% Relative CompactionASTM D2726 Method

90.6%2.286300oF Mix (Ave.)

Control

92.7%2.339270oF Mix (Ave.)

RedisetTM WMX 2%

92.2%2.327240oF Mix (Ave.)

RedisetTM WMX 2%

%RC RiceCore Density

(bulk)

Type of Mix

PG 64-10 Asphalt Mix

All Three Mixes

Warm Mix Trial at ChicoMain Observations

1. Pug mill Amperage

– 270oF mix similar to that of the control mix (300)

2. Field Densities

− Better % relative compaction compared to the control

3. Qualitative assessment of fumes

− Considerable reduction in fumes, almost no fumes with the240oF mix

Wider workability window and ease of mixing and compaction

RedisetTM wmx solutionsDistinctive features

1. Directly addresses the issue of moisture sensitivity

2. Moisture not introduced into the mix

3. Low temperature flexibility of asphalt enhanced

4. Formulated to suit a wide spectrum of aggregates

5. Binder and pavement cores can be analyzed for RedisetTM

wmx additives

6. Anti-Aging effect on binder – younger binder paved

7. Cost effective replacement for Hydrated Lime

RedisetTM wmx solutionsOther warm-mix benefits

* Reduction of asphalt fumes at mixing plant

* Reduction of asphalt fumes at paving site

* Ease of mixing and compaction reduce operationalcosts

* Reduced Mixing Drum amps – longer drum life.

* Paving in non-attainment areas, cool weather paving,extend paving season, longer hauls, night paving.

* Global concept addressing aggregate quality variability

NCAT Data on Adhesion TestingGDOT Method GDT-66Three Freeze Thaw Cycles, Min. 80% to Pass.

92.1%REDISET™ WMX 0725at 2% on binder = 2 lbsper ton aggregate and at1.5% = 1.5 lbs per tonaggregate.

97.7%Liquid Anti-Strip at 0.5%on Binder = o.5 lbs perton binder.

102.6%Hydrated Lime at 1% onMix = 20 lbs per tonaggregate

TSR %12.5 mm Mix

Key Aspects of The NCAT Study

1. Relative Lower initial TSR due to anti-agingeffect of Rediset™ Technology.2. Warm Mix PLUS Adhesive TechnologyCombined.3. Technology addresses Lower Mixtemperatures and risk of Moisture Damage aswell as aggregate quality variability.4. Passes GDOT approval for Hydrated Limereplacement.

- Dallas, TX - February 7,

2008

76-22 Mix

Mix with 15% RAP

Paving at 50oF to60oF airtemperature -windy

Mix produced at265oF to 310oFinstead of normal325oF

Workable up to215oF

Warm Mix Trial at Dallas TXMain Observations

First time paving 76-22 mix <70oF in Dallas area

Field densities were in the desired range Workable even up to 215 F

Mixes passed the Hamburg WT tests (>20,000 cycles)

Mixes with 15% RAP also gave good results

APAC very pleased with the results APAC to convince Dallas District Use of Rediset before winter to extend the season Investigate SMA mixes

All Three Mixes

All Three Mixes

Questions?