The CTS Laboratory of Thielsch, Inc. in Cranston, RI is accredited by the AASHTO Accreditation Program (AAP) for its testing methods and quality system standards as outlined on its certificates of accreditation. To maintain this accreditation, CTS Laboratory undergoes regular evaluations by AASHTO re:source and the Cement and Concrete Reference Laboratory (CCRL). Our AASHTO accreditation certificate can be found here: https://aashtoresource.org/laboratory/home?Action=ShowCertificate&LabId=41004