Date post: | 07-Jul-2018 |
Category: |
Documents |
Upload: | thiagotrazh |
View: | 221 times |
Download: | 0 times |
of 30
8/18/2019 Test to Acess the Potencial for Moisture Damage in Asphalt Mixtures
1/30
Tests to Assess the Potential for
Moisture Damage in Asphalt
Mixtures
Tests to Assess the Potential for
Moisture Damage in Asphalt
MixturesMike Anderson
Asphalt Institute Spring 2002 Meeting
Houston, TX
8/18/2019 Test to Acess the Potencial for Moisture Damage in Asphalt Mixtures
2/30
Moisture Damage TestsMoisture Damage Tests
Pre-SHRPImmersion-Compression Test
Boil Test
Texas Freeze-Thaw Pedestal Test
Swell Test (Hveem)
Lottman Test
Root-Tunnicliff Test
8/18/2019 Test to Acess the Potencial for Moisture Damage in Asphalt Mixtures
3/30
Moisture Damage TestsMoisture Damage Tests
Post-SHRPEnvironmental Conditioning System
Modified Lottman Test
Root-Tunnicliff Test
Hamburg Wheel Tracking Test
8/18/2019 Test to Acess the Potencial for Moisture Damage in Asphalt Mixtures
4/30
Modified Lottman TestModified Lottman Test
Standard Procedure AASHTO T-283
Specimen Size
4-inch (100-mm) diameter; 2.5-inch (63-mm) height
6-inch (150-mm) diameter; 3.75-inch (95-mm) height ?
Percentage of Air Voids
Construction air voids
– 7.0 ± 1.0%
8/18/2019 Test to Acess the Potencial for Moisture Damage in Asphalt Mixtures
5/30
Modified Lottman TestModified Lottman Test
AgingLoose Mix
– 16 hours at 60C in forced draft oven
Compacted Specimen
– 72-96 hours at ambient temperature (20-25C)
8/18/2019 Test to Acess the Potencial for Moisture Damage in Asphalt Mixtures
6/30
Modified Lottman TestModified Lottman Test
Specimen Conditioning (Conditioned Subset)Partial Vacuum Saturation
– After compacted specimen aging
– Initial saturation of 55-80%
8/18/2019 Test to Acess the Potencial for Moisture Damage in Asphalt Mixtures
7/30
Modified Lottman TestModified Lottman Test
Specimen Conditioning (continued)Freeze Cycle
– 15 hours at -18C
Thaw Cycle
– 24 hours at 60C
8/18/2019 Test to Acess the Potencial for Moisture Damage in Asphalt Mixtures
8/30
Modified Lottman TestModified Lottman Test
Specimen Conditioning (All Specimens)Temperature Equilibration
– 2 hours at 25C (water bath)
8/18/2019 Test to Acess the Potencial for Moisture Damage in Asphalt Mixtures
9/30
Modified Lottman TestModified Lottman Test
Mechanical TestIndirect Tensile Strength
– 50 mm/min. displacement rate
– Peak Load at Failure
8/18/2019 Test to Acess the Potencial for Moisture Damage in Asphalt Mixtures
10/30
Modified Lottman TestModified Lottman Test
Test ResultTensile Strength Ratio
– Average Indirect Tensile Strength of Conditioned
Specimens (St,wet) – Average Indirect Tensile Strength of Conditioned
Specimens (St,dry)
TSR =TSR =SSt,wett,wet
SSt,dryt,dry
8/18/2019 Test to Acess the Potencial for Moisture Damage in Asphalt Mixtures
11/30
Modified Lottman TestModified Lottman Test
Interpreting the ResultsTSR ≥ 0.80
– Acceptable resistance to moisture damage
Some agencies use TSR ≥ 0.70 as criterion
Mix Adjustments for Poor TSR
Liquid anti-stripping additives
Hydrated Lime
Change of aggregate/mix design
8/18/2019 Test to Acess the Potencial for Moisture Damage in Asphalt Mixtures
12/30
Root-Tunnicliff TestRoot-Tunnicliff Test
Standard Procedure ASTM D4867
Specimen Size
4-inch (100-mm) diameter; 2.5-inch (63-mm) height
6-inch (150-mm) diameter; 3.75-inch (95-mm) height ?
Percentage of Air Voids
Construction air voids
– 7.0 ± 1.0%
8/18/2019 Test to Acess the Potencial for Moisture Damage in Asphalt Mixtures
13/30
Root-Tunnicliff TestRoot-Tunnicliff Test
Aging
Loose Mix
– None required
Compacted Specimen
– None required (cool)
Specimen Conditioning (Conditioned Subset)Partial Vacuum Saturation
– Initial saturation of 55-80%
8/18/2019 Test to Acess the Potencial for Moisture Damage in Asphalt Mixtures
14/30
Root-Tunnicliff TestRoot-Tunnicliff Test
Specimen Conditioning (continued)
Freeze Cycle
– 15 hours at -18C (OPTIONAL)
Thaw Cycle
– 24 hours at 60C
Specimen Conditioning (All Specimens)Temperature Equilibration
– 2 hours at 25C (water bath)
8/18/2019 Test to Acess the Potencial for Moisture Damage in Asphalt Mixtures
15/30
Root-Tunnicliff TestRoot-Tunnicliff Test
Mechanical TestIndirect Tensile Strength
– 50 mm/min. displacement rate
– Peak Load at Failure
8/18/2019 Test to Acess the Potencial for Moisture Damage in Asphalt Mixtures
16/30
Root-Tunnicliff TestRoot-Tunnicliff Test
Test ResultTensile Strength Ratio
– Average Indirect Tensile Strength of Conditioned
Specimens (St,wet) – Average Indirect Tensile Strength of Conditioned
Specimens (St,dry)
TSR =TSR =SSt,wett,wet
SSt,dryt,dry
8/18/2019 Test to Acess the Potencial for Moisture Damage in Asphalt Mixtures
17/30
Root-Tunnicliff TestRoot-Tunnicliff Test
Interpreting the ResultsTSR ≥ 0.80
– Acceptable resistance to moisture damage
Some agencies use TSR ≥ 0.70 as criterion
Mix Adjustments for Poor TSR
Liquid anti-stripping additivesHydrated Lime
Change of aggregate/mix design
8/18/2019 Test to Acess the Potencial for Moisture Damage in Asphalt Mixtures
18/30
Environmental Conditioning
System (ECS)
Environmental Conditioning
System (ECS)
Standard ProcedureSHRP-developed (A-003A)
Oregon State University (Terrel et. Al.)
Specimen Size
4-inch (100-mm) diameter; 4-inch (100-mm) height
Percentage of Air Voids
Construction air voids
8/18/2019 Test to Acess the Potencial for Moisture Damage in Asphalt Mixtures
19/30
ECSECS
8/18/2019 Test to Acess the Potencial for Moisture Damage in Asphalt Mixtures
20/30
ECSECS
8/18/2019 Test to Acess the Potencial for Moisture Damage in Asphalt Mixtures
21/30
ECSECS
AgingLoose Mix
– 4 hours at 135C
Compacted Specimen
– None required (cool)
8/18/2019 Test to Acess the Potencial for Moisture Damage in Asphalt Mixtures
22/30
ECSECS
Specimen Conditioning and TestingInitial Resilient Modulus (uniaxial)
Thawing Cycles (1+)
– 60C
– Repeated loading, Mr
Freeze Cycle – Optional
– Repeated Loading, Mr
8/18/2019 Test to Acess the Potencial for Moisture Damage in Asphalt Mixtures
23/30
ECSECS
Interpreting the ResultsModulus Ratio
– Multiple conditioning cycles
– Accumulation of moisture damage
8/18/2019 Test to Acess the Potencial for Moisture Damage in Asphalt Mixtures
24/30
Loaded Wheel TestsLoaded Wheel Tests
Test TemperatureHigh Temperatures (40-60C)
Conducted under water
Loading
Repeated Wheel Passes
– Pressurized rubber hose w/ wheel
– Steel wheel
– Pneumatic wheel
8/18/2019 Test to Acess the Potencial for Moisture Damage in Asphalt Mixtures
25/30
Asphalt Pavement Analyzer Asphalt Pavement Analyzer
8/18/2019 Test to Acess the Potencial for Moisture Damage in Asphalt Mixtures
26/30
Hamburg Wheel TrackerHamburg Wheel Tracker
8/18/2019 Test to Acess the Potencial for Moisture Damage in Asphalt Mixtures
27/30
Hamburg Wheel Tracking TestHamburg Wheel Tracking Test
Rutting SlopeRutting Slope
Stripping SlopeStripping Slope
InflectionInflectionPointPoint
Load CyclesLoad Cycles
R u t D e p t h
R u t D e p t h
8/18/2019 Test to Acess the Potencial for Moisture Damage in Asphalt Mixtures
28/30
Other TestsOther Tests
ECS Conditioning w/ Mechanical Property Test
00
0.0040.004
0.0080.008
0.0120.0120.0160.016
0.020.02
00 10001000 20002000 30003000 40004000
CyclesCycles
P e r m a n e n t S h e a r
S t r a i n
P e r m a n e n t S h e a r
S t r a i n
ECS ConditionedECS Conditioned
Dry (Unconditioned)Dry (Unconditioned)
8/18/2019 Test to Acess the Potencial for Moisture Damage in Asphalt Mixtures
29/30
Other TestsOther Tests
Partial Vacuum Saturation w/ MechanicalProperty Tests
Arizona USArizona US--93 Moisture Sensitivity93 Moisture Sensitivity
75%75%
80%80%
85%85%
90%90%
95%95%100%100%
TSRTSR
DesignDesignTSRTSR
FieldFieldG*10HzG*10Hz
20C20C
TestTest
R a t i o
R a t i o
19mm
25mm
G*10HzG*10Hz
40C40C
8/18/2019 Test to Acess the Potencial for Moisture Damage in Asphalt Mixtures
30/30
Thanks !