Listed below are recent changes to AASHTO and/or OHD L procedures included in the OHCMTCB training and certification process. The most recent changes affected procedures for Aggregates, Materials Sampling & Testing, Asphalt, Concrete, and Soils.
Aggregates
AASHTO T 27 - Sieve Analysis of Fine and Coarse Aggregate
AASHTO T 248 - Reducing Samples of Aggregate to Testing Size
Soils
AASHTO T 85 - Specific Gravity and Absorption of Coarse Aggregate
AASHTO T 87 is now AASHTO R 58
AASHTO T 88 - Particle Size Analysis of Soils
AASHTO T 89 - Liquid Limit
AASHTO T 90 - Determining the Plastic Limit and Plasticity Index of Soils
*AASHTO T 310 - Density and Moisture by Nuclear Gauge
Asphalt
AASHTO T 30 - Mechanical Analysis of Extracted Aggregate
AASHTO T 312 - Superpave Gyratory
AASHTO R 47- Reducing Samples of Hot Mix Asphalt to Testing Size
*OHD L-14
OHD L-45
Concrete
*AASHTO T 22 - Compressive Strength
*AASHTO T 23 - Making and Curing Concrete Test Specimens in the Field
*AASHTO T 119 - Slump
*AASHTO T 309 has been replaced by ASTM C1064
*Included in Materials Sampling & Testing certification.