Recommended Precision Statements for AASHTO Standard Methods of Test T22, T 104, T 105, T 154, T 186, and T 242

TRB’s National Cooperative Highway Research Program (NCHRP) Research Results Digest 342: Recommended Precision Statements for AASHTO Standard Methods of Test T22, T 104, T 105, T 154, T 186, and T 242 summarizes the findings of research conducted to recommend new or updated precision statements of the American Association of State Highway and Transportation Officials (AASHTO) standard methods of test designated by the technical sections of the AASHTO Highway Subcommittee on Materials.

Precision statements of AASHTO standard methods of test addressed by RRD 342 include the following:
T 22, Compressive Strength of Cylindrical Concrete Specimens
T 104, Soundness of Aggregate by Use of Sodium Sulfate or Magnesium Sulfate
T 105, Chemical Analysis of Hydraulic Cement
T 154, Time of Setting of Hydraulic Cement Paste by Gillmore Needles
T 186, Early Stiffening of Hydraulic Cement (Paste Method)
T 242, Frictional Properties of Paved Surfaces Using a Full-Scale Tire