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8/4/2019 Rediset WMX Ecuador R
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Angelo Almeida & Tony NgAkzoNobel Surface Chemistry
Intercambio Technológico de Nuevas Metodologíasde Construcción y Conservación Vial
Quito, Ecuador
Warm Mix
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Beyond just a Warm-Mix Additive
Best Possible Anti-stripping agentfor hot-mix
No water/moisture introduced
Rediset WMX
Patents pending: Prem Naidoo, S. Logaraj Patents pending: Prem Naidoo, S. Logaraj
& A. James & A. James
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3Surface Chemistry
RedisetTM WMX Solutions
Main Focus1. Reducing mix, laydown and
compaction temperatures
2. Addressing moisture damage inwarm-mix
• Inefficient aggregate drying at
lower temp• Low temperatures being pushed to
extreme limit
3. Maintain PG Integrity of Binder
4. Cost Effective Solution
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4Surface Chemistry
Hot Mix and Warm Mix
REDISETTM WMXStandard Hot mix
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5Surface Chemistry
Reduction in Compaction Temperatures
4
4.5
5
5.5
6
6.5
7
300 F 270 F 240 F
Compaction Temp.,
% A
i r V o i d s
Control
wmx 7002
• PG 76-22 Asphalt
• Superpave coarse graded granite mix (12.5 mm max)
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6Surface Chemistry
Mechanism of Moisture Damage
Adhesion and Cohesion Failure by Moisture
Aggregate
As
phalt
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7Surface Chemistry
Moisture Damage
• Adhesion failure
• Water has a higher affinity for aggregatecompared to asphalt
• Asphalt cannot bond to aggregate with a wetsurface
• Cohesion failure• Inclusion of water within asphalt will weaken it’s
cohesive strength
• Moisture/Water should be eliminated from mix and
not incorporated
• Rediset products are designed to improve bothadhesion and cohesion in asphalt mixes
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Moisture Damage Survey*
Do You Treat HMA for Moisture Damage?
PredominantType of TreatmentUsed
LimeLime or liquids
LiquidsLiquids seldomNo or very rarely
*Tim Aschenbrenner, Moisture Damage Symposium, San Diego, 2003
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9Surface Chemistry
Texas Hamburg Wheel Tracking Test
APAC 76-22 Asphalt
250 F
250 F
300 F
Comp.Temp.
12.4029,9756.82.0Rediset WMX-7002
12.3229,9006.82.0Rediset WMX-7001
<12.5>20,0007.10.75Control + LAS
Deform,mm
Cycles tofailure
% AirVoids
Additive%
Material ID
Type D Surface, Design #7-MMD-05
Hamburg Test Temp 50°CA= Added to binder
B= Added to aggregate mix
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10Surface Chemistry
Hamburg Wheel Tracking TestLime comparison – PaveTexNote: Lime at 2% mix vs Rediset™ at 2% binder
0
2
4
6
8
10
12
14
Deform, m m
Rut Depth at ~20,000 Cycles
Control
Hydrated Lime
Rediset WMX-7019
Rediset WMX-7020
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11Surface Chemistry
PG Testing ResultsPG 64-22 Enhanced High & Low Temp
67.0 -29.164.4 -24.5Continuous PG Grade
0.3630.337BBR, Slope m-Value @ -12º C
122200BBR Creep Stiffness, S, @ -12º C
2.882.51RTFOT G*/Sin d (kPa) @ 64ºC
1.431.05G*/Sin d (kPa) @ 64º C
PG 64-22 +
2%
WMX 7002
PG 64-22Test
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12Surface Chemistry
Rediset
TM
WMX• Solid Additive – Pastilles
• Added to theasphalt
• Also can be addedto the mix at the hot-
mix plant
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13Surface Chemistry
RedisetTM WMX FunctionImprove Mix Workability
1. Reduce surface tension ofasphalt
2. Additives has a lubricatingeffect on the asphalt mix
• Easier to coat the aggregateand easier to compact
• Reduce mix and compactiontemperatures
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14Surface Chemistry
RedisetTM WMX - FunctionIncrease Resistance to Moisture Damage
• Improves
adhesion/chemicalbonding of asphalt
• Also improves thecohesive strength ofasphalt
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15Surface Chemistry
Trial at Chico, California
Significant Reduction in Fumes
240-250°F Warm-Mix
with 2% RedisetTM WMX-7002300°F Control
PG64-22 Mix, Chico Trial, 12/15/2007
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16Surface Chemistry
Chico, CA Trial
• The field densities at
240°F and 270°F werebetter compared to thecontrol at 300°F.
• Major improvement in themoisture resistanceproperties
• Based on TSR Test
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17Surface Chemistry
Warm Mix Trial Chico, California
% Relative Compaction, ASTM 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
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18Surface Chemistry
Warm Mix Trial Chico, CaliforniaTensile Strength Ratio*
Warm-Mix
Additive
Dry Tensile
Strength
psi
Wet Tensile
Strength
psi
Tensile
Strength
Ratio %
Control 122.8 55.2 45.0
WMX-7002 240oF 147.9 109.3 73.9
WMX-7002 270oF 124.7 100.7 80.8
WMX-7002 279oF 114.9 100.2 87.2
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19Surface Chemistry
APAC Dallas, TX Trial, 02-07-08
Extending the Paving Season
• PG 76-22 Mix
• Paving at 50°F to 60°Fair temperature -windy
• Mix produced at 265°Fto 310°F instead ofnormal 325°F (60°Flower)
• Mix with 15% RAP
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20Surface Chemistry
Warm Mix Trial at Dallas TX
Main Observations
• Field densities were in the
desired range• Workable even up to
215°F
• First time paving PG76-22
mix <70°F in Dallas area
• Mixes passed the HamburgWT tests (>20,000 cycles)
• Mixes with 15% RAP alsogave good results
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21Surface Chemistry
Lufkin, TX Trial – Field densities
Comparison with other Techniques
87
87.5
88
88.5
89
89.5
90
90.5
91
91.5
Control 295-280F T1 225-150F (1.5
lbs/Ton)
T2 225-140F (5
lbs/Ton)
T3 220-140F (5
lbs/Ton)
Rediset 225-140F
(2 lbs/Ton)
D
e n s i t y %
2% Rediset WMX-7002
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22Surface Chemistry
Trial with APAC at Beaumont, TX 09-04-08
SMA Mix
• Polymer modified PG 76-22 SMA mix
• Feeder road on I-10 in Beaumont, TX
• SMA mix difficult to compact under normalconditions
• 800 tons during the day of the trial
• 200 tons were placed during a pre-trial
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23Surface Chemistry
Trial with APAC at Beaumont, TX
SMA Mix, I-10 Feeder Road
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24Surface Chemistry
Trial with APAC at Beaumont, TX
Main Observations
• 55°F to 65°F reduction in mix temperature
• Compaction between 250°F to 210°F
• Initial field densities in the range that would result inbonus payment
• Good results with the Hamburg WT tests (>20,000cycles)
• Paving crew experiences significant reduction infumes and odor
• APAC pleased with the results and looking towardsusing our additive in cooler months to extend theseason
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25Surface Chemistry
Commercial Project with APAC
Jasper TX – 40,000 tons
• PG 70-22; limestone mix
• 60°F reduction in mix temperature
• Rediset WMX dosed into the drum dryer
• Also pre-blended with the asphalt in the tank
• Paving starting at 50°F air temperature
• Good field densities
• Good Hamburg results
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26Surface Chemistry
Commercial Project with APAC
Jasper, TX - Paving
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27Surface Chemistry
Commercial Project with APAC
Jasper, TX - Compaction
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28Surface Chemistry
Matt Corrigan - CalAPA Warm-Mix Conference
Sacramento, April 2009
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29Surface Chemistry
Trials Outside US
Vägverket Sweden
2003030Nov2008SKANSKA for
IRELAND
2003020Nov2008IRISH TAR
weather paving
1003030Night time coldOct.2008
VEIDEKKE,NORWAY
RoadPlant
°CLocation
TonsTemp.
Reduction,FocusDateProject
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30Surface Chemistry
Norway Trial at air temperature of -2°C30°C to 40°C Reduction in Compaction Temp
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31Surface Chemistry
Norway Trial at air temperature of -2°C30°C to 40°C Reduction in Compaction Temp
• 70-100 Pen asphalt
• Densities were inthe desired range
for the mix withRediset and Control
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32Surface Chemistry
Rediset WMX Unique Features
Apart from reducing mix and pavingtemperatures up to 30°F to 70°F
1. Warm-mix Additive and adhesionpromoter in one
• Will replace lime or liquid anti-stripping additives
2. Maintain asphalt PG grade• Improve low temperature
properties of certain asphalts
4. Works with a wide spectrumof asphalts, aggregates and mixes
5. No Moisture/Water incorporated.
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33Surface Chemistry
RedisetTM WMX Solutions
Other Warm-Mix Benefits
1. Reduction of asphalt fumes atmixing plant
2. Fuel savings ~20%
3. Reduction of asphalt fumes at
paving site
4. Ease of mixing and compactionreduce operational costs
5. Paving in non-attainment areas,cool weather paving, extendpaving season, longer hauls,night paving.
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34Surface Chemistry
Trial with APAC at Beaumont, TX
APAC and DOT officials
Thank You