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TRB’s National Cooperative Highway Research Program (NCHRP) has released Web-Only Document 140: Precision Estimates for AASHTO Test Methods T 186, T 154, and T 22, Determined Using CCRL Proficiency Sample Data. Web-Only Document 140 explores the precision estimates for American Association of State Highway and Transportation Officials’ Standard Test Method T 186 “Early Stiffening of Hydraulic Cement (Paste Method),” T 154 “Time of Setting of Hydraulic Cement Paste by Gillmore Needles,” and T 22 “Compressive Strength of Cylindrical Concrete Specimens.”

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Suggested Citation

National Academies of Sciences, Engineering, and Medicine. 2009. Precision Estimates for AASHTO Test Methods T 186, T 154, and T 22, Determined Using CCRL Proficiency Sample Data. Washington, DC: The National Academies Press. https://doi.org/10.17226/23023.

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Publication Info

8.5 x 11 |  DOI: https://doi.org/10.17226/23023
Chapters skim
Front Matter i-vi
CHAPTER 1. INTRODUCTION AND RESEARCH APPROACH 1-3
CHAPTER 2. RESULTS OF ANALYSIS AND ESTIMATES OF PRECISION 4-8
CHAPTER 3. CONCLUSIONS AND RECOMMENDATIONS 9-12
REFERENCES: 13-13
APPENDIX A: EARLY STIFFENING (FALSE SET) 14-20
APPENDIX B: GILLMORE INITIAL TIME OF SETTING 21-27
APPENDIX C: GILLMORE FINAL TIME OF SETTING 28-34
APPENDIX D: COMPRESSIVE STRENGTH 35-41

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