Listed below are summaries of the recent changes to AASHTO and/or OHD L procedures which impact the OHCMTCB training and certification process. Changes for the 2007-08 season affected procedures for Materials Sampler, Asphalt, Concrete, Soils, and Aggregates.

 

Soils

The ODOT "Standard Practice for Scalp and Replacament of Oversized Particles for AASHTO T 99 Methods C and D" issued in 2001 is no longer being used. Technicians should disregard that document and follow the procedures in ASSHTO T 99, T 180, and T 224. If you need guidance on the procedures, you may contact Dr. Gerald Miller or Dr. Donald Snethen.

Asphalt

AASHTO T 30 - Mechanical Analysis of Extracted Aggregate

  • Corrected section numbering error in Section 6.

    • *AASHTO T 168 - Sampling Bituminous Paving Mixtures

  • Cover page reduced from 7 items to 4.
  • ASTM D 979 had editorial changes throughout the text. (Procedures not changed.)

    • *OHD L-14 - Determining the Specific Gravity and Unit Weight of Compacted Bituminous Mixtures

  • Changed metric conversion of 1 degree Celsius from 1.8 to 2 degrees Fahrenheit.

    • Concrete

    *AASHTO T 22 - Compressive Strength of Cylindrical Concrete Specimens

  • Added new section (5.2.2.7) requiring mechanical means to ensure spherical portion is fixed and centered on bearing plate.
  • Added several sub-sections to Section 10, Precision and Bias. .

    • *AASHTO T 119 - Slump of Hydraulic Cement Concrete

  • Section 1.4 - Added warning about the caustic nature of fresh cement.
  • Added Section 5.1.1 - Requirement to check apparatus for conformance to specifications when acquired and annually thereafter.
  • Added Note 3 defining "consecutive pairs."
  • Put back sections 5.2 and 5.3 that were accidentally omitted in last year's publication.

    • Aggregates

    *AASHTO T 2 - Sampling of Aggregates

  • Added a new section titled "Terminology." Defines terms used in standard.
  • Removed English System units from table 1.
  • Removed US equivalents from text.
  • Missing X3.3.3 and part of X3.3.2

    • *Included in Materials Sampling & Testing certification.

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