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Procedures and Guidelines for Validating Contractor Test Data (2020)

Chapter: Abbreviations and Symbols

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Page 54
Suggested Citation:"Abbreviations and Symbols." National Academies of Sciences, Engineering, and Medicine. 2020. Procedures and Guidelines for Validating Contractor Test Data. Washington, DC: The National Academies Press. doi: 10.17226/25823.
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Page 54

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54 Abbreviations AAD Average Absolute Deviation AC Asphalt Binder Content AD Average Deviation ANOVA Analysis of variance AQC Acceptance Quality Characteristics CI Confidence Interval CV Coefficient of Variation CVL Cumulative Validation Lot D2S Difference Two-Sigma IA Independent Assurance LSL Lower Specification Limit OC Operating Characteristic PWL Percent Within Limits USL Upper Specification Limit Symbols Ha Alternative Hypothesis β Buyer’s risk C Factor that is a function of the number of contractor tests µ Mean of the population in the numerical simulation X− Mean of the sample H0 Null Hypothesis NH0 Number of hypothesis test results with a value of 0 in the numerical simulation P Pay Factor Q Quality Index R Range of the contractor tests n Sample size a Significance Level, seller’s risk s Standard deviation of the population in the numerical simulation s Standard deviation of the sample NT Total number of iterations in the numerical simulation Abbreviations and Symbols

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In the development of a quality assurance program, a state highway agency (SHA) incorporates policies and procedures for assessing how well the materials and construction used by a contractor on a construction project satisfy the agency's specifications.

The TRB National Cooperative Highway Research Program's NCHRP Research Report 946: Procedures and Guidelines for Validating Contractor Test Data reviews and evaluates the procedures and practices used in the acceptance of construction materials. The report also proposes a related practice for incorporation into AASHTO Standard Specifications for Transportation Materials and Methods of Sampling and Testing.

Supplemental files to the report include Appendices A through E, available as a single PDF file, a State Highway Agency Survey (Appendix A), Survey Responses (Appendix B), Numerical Simulations (Appendix C), State Highway Agency Date Analysis (Appendix D), and Statistical Tables (Appendix E).

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