CTM to AASHTO
Testing, Accreditation and Independent
Assurance

Cathrina Barros, PE
CT Independent
Assurance Program
Why?
Superpave
AASHTO/ASTM vs CTM
AASHTO/
ASTM

Description
(Aggregate Tests)

CTM

T 11

Materials Finer Than 75-μm (No. 200) ...
Superpave
AASHTO/ASTM vs CTM
AASHTO/
ASTM

Description
(Mix Test)

CTM

T 209

Theoretical Maximum Specific Gravity and De...
Superpave
New Test Methods
AASHTO

T 312

T 324

Preparing and Determining the Density of Hot
Mix Asphalt (HMA) Specimens ...
T 312 – Superpave Gyratory
Compactor
Ram pressure
600 kPa
150 mm diameter mold

1.25° External

*1.16° Internal
30 Gyratio...
Superpave Gyratory Compactor

Pine SGC
Model AFG2A

Troxler SGC
Model 4140
T 324 – Hamburg Wheel Tracker

PWS
Hamburg Wheel Tracker
Laboratory Equipment
Hamburg Wheel Tracker
1 Pass

Wheel

1 Pass

CT Specifications require 25,000 passes during testing
Superpave
New Test Methods
AASHTO - Modifications
T 324
Hamburg Wheel-Track Testing of Compacted Hot Mix Asphalt (HMA)
Tar...
HMA Mix Design Requirements
Quality
Characteristic

AASHTO
Designation

CT Test Method

Air Void Content (%)

AASHTO T 269...
HMA Mix Design Requirements
Per SP-2:
 VFA (Voids filled with
Asphalt)
 VMA (Voids in Mineral
Aggregate)
 Dust Proporti...
Aggregate QC Requirements
Quality
Characteristic

AASHTO
Designation

CT Test Method

Aggregate Gradation

AASHTO T27

CT ...
QC Requirements for In Place
HMA
Quality
Characteristic

AASHTO
Designation

CT Test Method

Asphalt Binder
Content (%)

A...
QC Requirements for In Place
HMA
Quality
Characteristic

AASHTO
Designation

CT Test Method

% of TMD by core

n/a

CT 375...
AASHTO T 176 vs. CT 217
T 176, “Plastic Fines in Graded Aggregates and Soils
by Use of the Sand Equivalent Test”
 T 176 a...
CTM in Superpave Specification
 CT

125: Sampling
 CT 202: Fractionation Gradation
 CT 204: Plasticity Index
 CT 368: ...
Caltrans IA Program
Tester Qualification
 Laboratory
Accreditation


◦ District IA Staff
◦ Local Assistance IA
Staff und...
Superpave and the Caltrans IA
Program
◦ Effects to the IA Program
 No change in current requirements in:
Accrediting lab...
Superpave
Laboratory Accreditation


Current requirements from IA Manual
apply
 Participation in Caltrans’ RSP
 Submitt...
Superpave
Technician Certification
 Current requirements from IA Manual
still apply
 associated with a laboratory
 perf...
IA
Proficiency
Certificate
Questions?
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Cathrina Barros

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Presentation by Cathrina Barros of Caltrans on Testing Accreditation and Independent Assurance delivered at the CalAPA Fall Asphalt Pavement Conference Oct. 24, 2013 in Sacramento, Calif.

Published in: Business, Technology
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  • In general, AASHTO test methods look at the big picture. CT’s are specifically tailored for CT needs.
  • Hamburg modification to be discussed in next slides
  • SGC Compaction Mechanics – simulates field compaction process
  • T 324 modified to the above parameters
  • Volumetrics = Air Voids, VMA, VFA
  • Accrediting Laboratories – Participate in RSP, Review of CLAM by IA staff, Laboratory inspection – Follows IA Manual GuidelinesCertifying Technicians – written and practical testing – Follows IA Manual Guidelines
  • CLAM = Caltrans Laboratory Accreditation ManualCLAM should contain at a minimum – Lab Contact info, Org Chart, List of Tests run, Equipment List and Calibration, Personnel List with qualifications, Material Quality control, Safety Almost all Ct labs are part of AMRL RSP
  • TL-0111 = Caltrans certificate of proficiency
  • Cathrina Barros

    1. 1. CTM to AASHTO Testing, Accreditation and Independent Assurance Cathrina Barros, PE CT Independent Assurance Program
    2. 2. Why?
    3. 3. Superpave AASHTO/ASTM vs CTM AASHTO/ ASTM Description (Aggregate Tests) CTM T 11 Materials Finer Than 75-μm (No. 200) Sieve in Mineral Aggregates by Washing 201, 202 T 27 Sieve Analysis of Fine and Coarse Aggregates 201, 202 T 30 Mechanical Analysis of Extracted Aggregate 201, 202 T 335 Determining the Percentage of Fracture in Coarse Aggregate 205 T 84 T85 Specific Gravity and Absorption of Fine Aggregate 207 Specific Gravity and Absorption of Coarse Aggregate 206 T 176 Plastic Fines in Graded Aggregates and Soils by Use of the Sand Equivalent Test 217 T 304 Uncompacted Void Content of Fine Aggregate 234 Flat Particles, Elongated Particles, or Flat and
    4. 4. Superpave AASHTO/ASTM vs CTM AASHTO/ ASTM Description (Mix Test) CTM T 209 Theoretical Maximum Specific Gravity and Density of Hot Mix Asphalt (HMA) 309 T 269 Percent Air Voids in Compacted Dense and Open Asphalt Mixtures 308, 309 T 275 Bulk Specific Gravity of Compacted Hot Mix Asphalt (HMA) Using Paraffin-Coated Specimens 308 T 283 Resistance of Compacted Hot Mix Asphalt (HMA) to Moisture-Induced Damage 371 T 308 Determining the Asphalt Binder Content of Hot Mix Asphalt (HMA) by the Ignition Method 382 T 312 Preparing and Determining the Density of Hot Mix Asphalt (HMA) Specimens by Means of the Superpave Gyratory Compactor None T 324 Hamburg Wheel-Track Testing of Compacted Hot Mix Asphalt (HMA) None T 329 Moisture Content of Hot Mix Asphalt (HMA) by Oven Method 370
    5. 5. Superpave New Test Methods AASHTO T 312 T 324 Preparing and Determining the Density of Hot Mix Asphalt (HMA) Specimens by means of the Superpave Gyratory Compactor Hamburg Wheel-Track Testing of Compacted Hot Mix Asphalt No Modification Modified Utilized for HMA Mix Design on the basis of Volumetrics Utilized to determine the Rutting and Stripping Resistance of HMA NO CTM equivalent No CTM equivalent
    6. 6. T 312 – Superpave Gyratory Compactor Ram pressure 600 kPa 150 mm diameter mold 1.25° External *1.16° Internal 30 Gyrations/Minute
    7. 7. Superpave Gyratory Compactor Pine SGC Model AFG2A Troxler SGC Model 4140
    8. 8. T 324 – Hamburg Wheel Tracker PWS Hamburg Wheel Tracker
    9. 9. Laboratory Equipment Hamburg Wheel Tracker 1 Pass Wheel 1 Pass CT Specifications require 25,000 passes during testing
    10. 10. Superpave New Test Methods AASHTO - Modifications T 324 Hamburg Wheel-Track Testing of Compacted Hot Mix Asphalt (HMA) Target Air Voids 7±1 percent No. of Test Specimens 4 Test Specimen 6” gyratory compacted specimen Test Temperature 122±2 °F (PG 58) Measurements Impression per 100 passes Inflection Point No. of wheel passes at intersection of creep slope and stripping slope Testing Shut off 25,000 passes For RHMA test specimens SGC ram pressure may be increased to a maximum 825 kPa Held at constant height for a maximum of 90 minutes
    11. 11. HMA Mix Design Requirements Quality Characteristic AASHTO Designation CT Test Method Air Void Content (%) AASHTO T 269 CT 308, 309 Gyration Compaction AASHTO T 312 n/a Voids Filled with Asphalt (VFA) SP-2 n/a Voids in Mineral Aggregate (VMA) SP-2 n/a Dust Proportion SP-2 n/a Hamburg Wheel Track AASHTO T 324 n/a Moisture Susceptibility CT371 AASHTO T 283
    12. 12. HMA Mix Design Requirements Per SP-2:  VFA (Voids filled with Asphalt)  VMA (Voids in Mineral Aggregate)  Dust Proportion  All by total weight of mix (TWM)
    13. 13. Aggregate QC Requirements Quality Characteristic AASHTO Designation CT Test Method Aggregate Gradation AASHTO T27 CT 201, 202 Sand Equivalent AASHTO T176 CT 217 Aggregate Moisture Content AASHTO T329 CT 370 Percent of Crushed Particles AASHTO T335 CT 205 LA Rattler AASHTO T 96 CT 211 Flat and Elongated Particles ASTM D4791 CT 235 Fine Aggregate Angularity AASHTO T304, Method A CT 234
    14. 14. QC Requirements for In Place HMA Quality Characteristic AASHTO Designation CT Test Method Asphalt Binder Content (%) AASHTO T308, Method A CT 382 HMA Moisture Content AASHTO T329 (%) CT 370 Air Void Content(%) AASHTO T269 n/a Gyration Compactions AASHTO T312 n/a Voids in Mineral Aggregate (VMA) SP-2 n/a Voids Filled with Asphalt (VFA) SP-2 n/a Dust Proportion SP-2 n/a
    15. 15. QC Requirements for In Place HMA Quality Characteristic AASHTO Designation CT Test Method % of TMD by core n/a CT 375 % of TMD by nuclear gage n/a CT 375 Hamburg Wheel Track AASHTO T 324 (Modified) n/a Moisture susceptibility AASHTO T283 (minimum dry strength (freeze-thaw required) & minimum wet strength) CT 371
    16. 16. AASHTO T 176 vs. CT 217 T 176, “Plastic Fines in Graded Aggregates and Soils by Use of the Sand Equivalent Test”  T 176 allows: ◦ Manual shaker ◦ SE solution with formaldehyde ◦ Two allowable methods to prepare samples Specifications require the use of a “sand reader indicator” and does not allow manual shaking and SE solutions with formaldehyde  CT test method requires working solution to be discarded after 2 weeks. AASHTO T 176 allows 30 days. 
    17. 17. CTM in Superpave Specification  CT 125: Sampling  CT 202: Fractionation Gradation  CT 204: Plasticity Index  CT 368: OGFC  CT 375: % TMD  LP-9: RAP Gradation  LP-10: Crumb Rubber Tests  LP-11: Rubber Binder Viscosity
    18. 18. Caltrans IA Program Tester Qualification  Laboratory Accreditation  ◦ District IA Staff ◦ Local Assistance IA Staff under METS  Reference Sample Program http://www.dot.ca.gov/hq/esc/Translab/ofpm/IAP.htm
    19. 19. Superpave and the Caltrans IA Program ◦ Effects to the IA Program  No change in current requirements in: Accrediting laboratories Certifying technicians  Change in IA practice: Know both AASHTO and CT Test Methods Certification  CTM = Certificate of Proficiency (TL-0111)  AASHTO = “witness” statement (development stage)
    20. 20. Superpave Laboratory Accreditation  Current requirements from IA Manual apply  Participation in Caltrans’ RSP  Submittal of CLAM  Laboratory inspection  New requirements  Laboratories testing aggregate and preparing mix design, “must be qualified under AASHTO and the Department’s Independent Assurance Program”
    21. 21. Superpave Technician Certification  Current requirements from IA Manual still apply  associated with a laboratory  performs written and proficiency tests  Certificate of proficiency for CTM’s  New requirements (AASHTO Test methods)  Take written exam for AASHTO exam  Witness exam in front of IA personnel  AASHTO Test Methods  “Witness” statement in lieu of Certificate
    22. 22. IA Proficiency Certificate
    23. 23. Questions?
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