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The National Academies

NCHRP 09-26A [Completed]

Data Mining and Interlaboratory Studies to Prepare Precision Statements for AASHTO Standards

  Project Data
Funds: $1,460,301
Includes funds expended in NCHRP Project 9-26.
Research Agency: AASHTO Materials Reference Laboratory
Principal Investigator: Haleh Azari
Effective Date: 1/1/2007
Completion Date: 11/15/2010
Comments: Work of this type for the AASHTO Highway Subcommittee on Materials is now conducted in NCHRP Project 10-87.

The objective of this project was to develop precision and bias statements for AASHTO standard test methods designated by the technical sections of the AASHTO Highway Subcommittee on Materials (HSCOM).

Project final reports are available as the following NCHRP Web-Only Documents: 139: Precision Estimates for AASHTO Test Method T 105, Determined Using CCRL Proficiency Sample Data; 140: Precision Estimates for AASHTO Test Methods T 186, T 154, and T 22, Determined Using CCRL Proficiency Sample Data; 141: Precision Estimates for AASHTO T 104, Determined Using AMRL Proficiency Sample Data; 142: Precision Estimates of AASHTO T 242; 163: Precision Estimates of AASHTO T 267: Determination of Organic Content in Soils by Loss of Ignition; 164: Precision Estimates of AASHTO T 265: Laboratory determination of Moisture Content of Soils; 165: Precision Estimates of AASHTO T 148: Measuring Length of Drilled Concrete Cores; 166: Precision Estimates of AASHTO T 283: Resistance of Compacted Hot Mix Asphalt (HMA) to Moisture-Induced Damage; 167: Statistical Modeling of Cement Heat of Hydration Using Phase and Fineness Variables; and 168: Precision Estimates of AASHTO T 180: Moisture-Density Relations of Soils Using a 4.54-kg (10-lb) Rammer and a 457-mm (18-in) Drop.

Summaries of these Web-Only Documents are available in NCHRP Research Results Digest 342: Recommended Precision Statements for AASHTO Standard Methods of Test T 22, T 104, T 105, T 154, T186, and T242 and NCHRP Research Results Digest 351: Precision Statements for ASSHTO Standard Methods of Test T 148, T 265, T 267, and T 283.



 

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