Programs that work for you

"They are rigorous, they’re about making sure our labs, personnel, and test methods conform, that they’re in compliance. They’re independent, not driven by a vendor or a construction company.”


California Department of Transportation

Philip Stolarski, Deputy Division Chief, DES-METS & GS

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55+ years of experience
3,000+
PSP participants
23,000+
samples shipped per year
1,000
laboratory assessments per year
2,000+
accredited labs










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  • Test Method Added To Scopes of Service

    Sep 29, 2022
    The following was recently added to our scopes of services: ASTM D7012 Standard Test Methods for Compressive Strength and Elastic Moduli of Intact Rock Core Specimens under Varying States of Stress and Temperatures - Method D.
    Full story
  • Proficiency Sample Reenrollment Fee

    Aug 30, 2022
    Participants that do not pay their annual PSP invoice within 30 days of receipt will have their enrollment cancelled. Because of the amount of time it takes our staff to reenroll participants, if your lab’s enrollment is cancelled and needs to be reenrolled, you will be charged a fee of $100.
    Full story
  • Changes to the Asphalt Mixture Hveem Design Samples

    Aug 26, 2022
    The sample scheme known as the Asphalt Mixture Hveem Design Samples will be split into three distinct programs based on the method of compaction used to prepare the specimens.
    Full story
  • Delayed Implementation of AASHTO Standards’ Temperature Requirements

    Aug 16, 2022
    After a preliminary review of the 42nd edition of the AASHTO Materials Standards, we anticipate many standards will require additional changes before we can begin complete enforcement of the new requirements throughout our programs. ​
    Full story
  • AASHTO Accreditation Program (AAP) Fees

    Jun 30, 2022
    The AASHTO Accreditation Program (AAP) is raising its annual administrative fees starting on July 1, 2022.
    Full story
  • AASHTO re:source Return to On-Site Assessments

    May 26, 2022
    AASHTO re:source will resume on-site assessments (rather than remote assessments) in all parts of the United States starting July 25, 2022. We will continue to perform remote assessments for customers outside of the United States. We will continue to offer remote assessments for all laboratories that need a supplemental assessment in order to add standards to their current scope of accreditation.
    Full story
  • Updated Duty of Care for On-Site Assessments

    Apr 13, 2022
    As of April 13, 2022, the Duty of Care for On-Site Assessments has been updated. Please review it for the most current information.
    Full story
  • Test Method Added To Scopes of Service (2nd Quarter, 2022)

    Apr 07, 2022
    ASTM D7263, Standard Test Methods for Laboratory Determination of Density and Unit Weight of Soil Specimens, has been added to our scopes of service for the assessment and accreditation programs.
    Full story
  • Test Method Added To Scopes of Service (1st Quarter, 2022)

    Feb 10, 2022
    ASTM D8225, Standard Test Method Determination of Cracking Tolerance Index of Asphalt Mixture Using the Indirect Tensile Cracking Test at Intermediate Temperature, has been added to our scopes of service for the assessment and accreditation programs.
    Full story
  • Return to On-Site Assessments

    Sep 29, 2021
    After careful planning, AASHTO will begin conducting on-site assessments in states/territories where available information indicates that COVID-19 conditions are safe for travel. COVID-19 data will be monitored continually until all assessments in the state are complete.
    Full story
  • Update on Laboratory Assessments

    Aug 16, 2021
    At this time, we will continue to conduct remote assessments until further notice. When a new target date for return to on-site assessments has been determined, we will inform customers via email, our website, and social media. We will send another update to customers no later than October 3, 2021.
    Full story
  • AASHTO Releases the 41st Edition of the "Standard Specifications for Transportation Materials and Methods of Sampling and Testing, and AASHTO Provisional Standards"

    Aug 02, 2021
    On Friday, July 30, 2021, AASHTO released the Standard Specifications for Transportation Materials and Methods of Sampling and Testing, and AASHTO Provisional Standards, 41st Edition—2021 (the “Materials Standards”). Be advised that AASHTO currently released the PDF Download version of the standards; the five-volume paperback version is being printed and will be available to purchase in September 2021.
    Full story
  • Postponing the Return to On-Site Assessments

    Jul 28, 2021
    In June, we announced our plan to return to on-site assessments in September. After careful consideration, AASHTO re:source has made the difficult decision to postpone this return to on-site assessments.
    Full story
  • New Test Methods Added

    Jun 29, 2021
    We will be adding the following tests to our scope of accreditation starting June 30: ASTM A615, ASTM A706, and ASTM A1064.
    Full story
  • AASHTO re:source Resuming On-Site Assessments in September 2021

    Jun 29, 2021
    We are pleased to announce that AASHTO re:source is tentatively planning to resume on-site laboratory assessments the week of September 6, 2021.
    Full story
  • Changes to the Aggregate Proficiency Sample Program

    Jun 01, 2021
    Calendar year 2022 will bring a significant change to the Proficiency Sample Program. The existing “Coarse” and “Fine” sample programs will be replaced with “Aggregate Gradation and Gravity” and “Aggregate Degradation” sample programs.
    Full story
  • Important Announcement About the AASHTO Materials Standards

    Apr 23, 2021
    Effective this year, AASHTO will make two important changes to the 2021 Edition of the Standard Specifications for Transportation Materials and Methods of Sampling and Testing, and AASHTO Provisional Standards (the "Materials Standards"), starting in July 2021.
    Full story
  • New Test Methods Added

    Nov 16, 2020
    AASHTO re:source is now offering assessments and AASHTO Accreditation for the following test methods: AASHTO T 103; AASHTO T 340; ASTM D8159
    Full story
  • Changes to AASHTO re:source Services Due to COVID-19

    Mar 13, 2020
    The health and safety of our customers, staff, and communities are of utmost importance to AASHTO. After careful consideration, the following changes will be made to our programs effective Monday, March 16, 2020
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  • Save the Date for the 2020 Technical Exchange!

    Sep 27, 2019
    Planning is underway for the fourth annual AASHTO re:source Technical Exchange. This unique event has proven to be a great opportunity for laboratory managers, quality managers, supervisors, and technicians to learn more about quality and testing in the construction materials testing (CMT) industry.
    Full story
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