Quality Assurance Program - Oregon Department Of Transportation Page 13
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28Certified Density Technician (CDT):
A CDT performs in-place density testing of soils, aggregates, and asphalt mixtures using the
nuclear density gauge.
In addition to certification, a CDT must possess a current Radiation
Safety Card issued by an approved source. For soil, soil aggregate mixtures, and aggregates a
CDT determines percentages of coarse and fine material, performs one point testing and related
calculations.
Certified Asphalt Technician I (CAT-I):
A CAT-I performs sampling and testing for HMAC and EAC mixtures including AC content,
maximum specific gravity, sieve analysis, void measurements, and other tests and duties as
required by current specifications.
Certified Asphalt Technician II (CAT-II):
A CAT-II is responsible for managing the volumetric properties of asphalt mixes by controlling
plant operations, for troubleshooting HMAC sampling and testing processes, and for making
appropriate adjustments to HMAC production and lay down procedures. Certification at
CAT-II level is contingent on having successfully completed the CAT-I certification phase
at least once.
Certified Mix Design Technician (CMDT):
A CMDT is responsible for preparing HMAC and EAC Mix Designs, including all material
testing and data analysis necessary to properly complete a design. A CMDT prepares designs for
both dense and open graded mixtures.
Quality Control Technician (QCT):
A QCT performs testing of fresh Portland cement concrete including sampling, concrete
temperature, slump, unit weight, air content, and fabrication of specimens for strength testing
and performs other duties including calculating cement content and water-cement ratio as
required by specifications. QCT certification is obtained through the ACI Concrete Field Testing
Technician - Grade 1 certification program, with the Oregon written Supplemental test,
conducted by the Oregon Concrete and Aggregate Producers Association (OCAPA).
Concrete Control Technician (CCT):
A CCT is responsible for preparing concrete mix designs. Proportioning concrete mixtures to
meet job requirements, and for making adjustments to the mix design as necessary to provide a
concrete mixture of the quality required by specifications. A CCT certification is obtained
through a training program conducted by OCAPA.
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