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"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, Former Deputy Division Chief, DES-METS & GS

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60+	years of experience
3,000+ PSP participants
23,000+ samples shipped per year
1,000 laboratory assessments per year
2,100+ accredited labs

News

2026 Updates to AASHTO R 18

Jul 31, 2026

AASHTO R 18 has undergone a significant revision through several years of balloting through the AASHTO Committee on Materials and Pavements (COMP).

AASHTO re:source and CCRL will officially start assessing testing agency conformance to the updated requirements specified in AASHTO R 18-26 beginning January 1, 2027. A testing agency may implement the changes prior to January 1, 2027, but it should notify the assessor about the implementation prior to the on-site assessment to avoid confusion.

Review the Summary of Changes document for full details.