LABORATORY TESTING OF
ORGANIC AND CHEMICAL
WARM MIX ASPHALT
TECHNOLOGIES
Martins Zaumanis
St.Louis, Missouri, 12.10.2011
2nd INTERNATIONAL WARM MIX CONFERENCE
2
• Erik Nielsen
• Erik Olesen
Technical University of
Denmark
• Juris Smirnovs
Riga Technical
University, Latvia
Worcester Polytechnic University
3
Foaming
• Low Energy asphalt
• Low emission asphalt
• WAM®-Foam
• LEAB
• LT asphalt
• Advera
• Aspha min
Organic or wax
• Sasobit
• Asphaltan A
• Asphaltan B
• Licomont BS 100
Chemiclal
• Evotherm ET
• Evotherm DAT
• Cecabase RT
• Rediset WMX
• Warm Mix L
4
Sasobit Rediset WMX
5
Principle
•Fischer-Tropsch process wax
•Crystallization point ~90°C
•At production temperature reduces bitumen viscosity
•After crystallization hardens the bitumen
Production
•The specified dosage of additive can be introduced to binder or purchased in emulsion form
6
Principle
• Melting point ~ 110°C
• Rheology modifier based on organic additives;
• Surface active formulation that allows the bitumen to disperse and coat the aggregates;
• Hydrophilic amine group absorbs on the aggregate surface, which prevents water from entering the aggregate and bitumen interface.
Production
• In form of flakes and granules
• Can be introduced in bitumen, in line with bitumen or directly to mixer
7
Dynamic viscosity
Kinematic viscosity
Softening point
Penetration
G* and δ (40/60only)
Testing unaged
Fraass (50/70only)
Testing after RTFOT @163°C
Change in mass
Bitumen 50/70
Sasobit
3%
Rediset WMX
2%
Bitumen 40/60
Sasobit
2% 3%
Rediset WMX
1% 2%
8
Analysis
Bitumen 50/70 Bitumen 40/60
Ref.
50/70
+3%
Sas.
+2%
Red.
Ref.
40/60
+2%
Sas.
+3%
Sas.
+1%
Red.
+2%
Red.
Penetration at
25°C,
65,0 45,2 55,4 48,0 33,3 32,6 43,0 37,3
Softening
point, °C
50,4 78,4 58,1 50,4 64,0 78,8 51,4 52,2
Dynamic
viscosity at
60oC, Ps·2
340 2379 570 440 1148 2417 446 552
Kinematic
viscosity at
135oC, mm2/s
607 485 529 545 468 422 508 448
Fraass breaking
point, °C
-25 -20 -21 - - - - - 0
200
400
600
800
1000
-40 -20 0 20 40 60 80 100 120 140 160
Co
ns
iste
nc
y
Temperature oC
Bitumen 50/70 test data chart
Original bitumen
3% Sasobit
2% Rediset WMX
Compaction viscosity (1.7-25 Pa·s)
Mixing viscosity (0.2-0.55 Pa·s)
Softening point (ASTM), oC
Fraas breaking point, oC
Compaction viscosity (1.7-25 Pa·s)
Mixing viscosity (0.2-0.55 Pa·s)
Softening point (ASTM), oC
Fraas breaking point, oC
9
Analysis Bitumen 50/70
Ref. 50/70 +3% Sas. +2% Red.
Change in mass, % -0,10 -0,09 -0,12
Retained penetration, % 70,8 72,0 69,0
Softening point, °C
(change)
56,8
(+6,4)
80,3
(+1,9)
63,7
(+5,6)
Fraass breaking point, °C
(change)
-20
(+5)
-19
(+1)
-23
(-2)
After RTFOT aging @ 163°C
Test conditions:
*8 different temperatures
*10 frequencies
*2,5mm plate
10
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
0 10 20 30 40 50 60 70 80 90
G*
Rat
io
Measurement Number
G* relative to pure bitumen as function of temperature and frequency2% Sasobit
3% Sasobit
1% Rediset WMX
2% Rediset WMX
90 C 80 C 70 C 60 C 50 C 40 C 30 C
Increasing frequency from 0.01 Hz to 10 Hz within each temperature
Pure bitumen
100 C
40/60 bitumen
Test conditions:
*8 different temperatures
*10 frequencies
*2,5mm plate
11
40/60 bitumen
-30
-25
-20
-15
-10
-5
0
5
0 10 20 30 40 50 60 70 80 90
Phas
e an
gle
diff
erer
nce,
o
Measurement number
Difference in phase angle relative to 40/60 Bitumen
2% Sasobit 3% Sasobit
1% Rediset WMX 2% Rediset WMX
Increasing frequency from 0.01 Hz to 10 Hz within each temperature
100 C 90 C 80 C 70 C 60 C 50 C 40 C 30 C
Pure bitumen
Original
Mixture composition
Aging
Compaction temperature
155oC
0h 2h 4h
Sasobit 3% Rediset WMX 2%
115oC
Compaction temperature
125oC
Aging Aging
135oC
2h 0h 2h 4h
Compaction
Gyratory compactor
Testing
Dynamic creep
Stiffness modulus
Density
Marshall hummer
Testing
Stiffness modulus
Density Flow and stability
Dynamic creep
EN12697-34 60°C
EN12697-6 (method B)
EN12697-25 40°C
EN12697-26 20°C
EN12697-6 (method D)
EN12697-25 40°C
EN12697-26 20°C 12
SMA-11 (40/60)
0
2000
4000
6000
8000
10000
0h 2h 4h
Sti
fness,
MP
a
Cure time
Reference Sasobit Rediset WMX
13
Indirect tensile test:
*@ 20oC
*55 µm
*rise time of 124 ms
2455
2460
2465
2470
2475
2480
105 115 125 135 145 155
Bu
lkd
en
sit
y,
kg
/m3
Temperature, oC
Gyratory compaction
HMA
Rediset WMX
Sasobit
2455
2460
2465
2470
2475
2480
105 115 125 135 145 155
Bu
lkd
en
sit
y,
kg
/m3
Temperature, oC
Marshall hammer
HMARediset WMXSasobit
84,086,088,090,092,094,096,098,0
100,0
1 10 100%
of
ma
xim
um
de
ns
ity
Number of gyrations
Rediset WMXRed(135C)Red(125C)Red(115C)Ref(155C)
84,086,088,090,092,094,096,098,0
100,0
1 10 100
% o
f m
ax
imu
m d
en
sit
y
Number of gyrations
SasobitSas(135C)Sas(125C)Sas(115C)Ref(155C)
Compactability for 200 gyrations
0
1000
2000
3000
4000
5000
6000
7000
155 135 125 115
Sti
fness m
od
ulu
s,
Mp
a
Compaction temperature, oC
Gyratory specimens
Reference
Sasobit
Rediset WMX
15
Indirect tensile test:
*IT CY
*@ 20oC
*55 µm
*rise time of 124 ms
0
1000
2000
3000
4000
5000
6000
7000
155 135 125 115
Sti
fne
ss
mo
du
lus
, M
pa
Compaction temperature, oC
Marshall specimens
Reference
Sasobit
RedisetWMX
0
1
2
3
4
5
6
155 135 125 115
Mars
hall f
low
, m
m
Temperature, oC
Reference
Sasobit
Rediset WMX
16
Marshall test @ 60oC
Stability test results
Flow test results
00,20,40,60,8
11,21,41,61,8
2
155 135 125 115
Mars
hall q
uo
tien
t, k
N/m
m
Temperature, oC
Reference
Sasobit
Rediset WMX
0123456789
10
155 135 125 115
Ma
rsh
all
sta
bil
ity,
kN
Temperature, oC
Reference
Sasobit
Rediset WMX
Marshal quotient
17
Dynamic creep test:
*@40oC
*3600 pulses
*100 kPa stress
*900s relaxation period
012345
Stra
in, %
Temperature
Marshall specimens
Reference
Sasobit
RedisetWMX
155oC 125oC 125oC
2,12,5 2,3
Air voids
012345
Stra
in, %
Temperature
Gyratory specimens
Reference
Sasobit
RedisetWMX
155oC 125oC 125oC
2,62,3 2,4
Air voids
Maximum strain results
18
• Addition of Sasobit® changes the bitumen viscosity and provides higher resistance to deformations and improved elasticity of bitumen;
• Addition of Rediset WMX® has minor effect on bitumen rheology;
• Addition of both additives increases the Fraas breaking point temperature; after RTFOT they are similar again;
• Asphalt aging should be performed before compaction;
• WMA has similar compaction characteristics and density as HMA at up to 30oC lower temperature;
• Similar mechanical performance at temperature 30oC lower than for HMA.
Future work:
• Building a WMA test section in Latvia
Martins Zaumanis
St.Louis, Missouri, 12.10.2011