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Page 59
Suggested Citation:"Section 1 - Scope." 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.
Page 59

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Proposed Practice for Validating Contractor Test Data 59 AASHTO Designation: R xx– 1. SCOPE 1.1 Purpose – The purpose of this practice is to provide guidance on how State Highway Agencies (SHAs) should validate Contractor data that are used in acceptance decisions for materials and construction. 1.2 Target audience – This practice is intended for SHA materials and construction engineers responsible for establishing and maintaining Quality Assurance programs for highway materials and construction, Contractor personnel responsible for 1.3 Background resources – Relevant resources are NCHRP Research Report 946: Procedures and Guidelines for Validating Contractor Test Data, Federal Highway Administration’s (FHWA’s) Technical Advisory T 6120.3 Use of Contractor Test Results in the Acceptance Decision, Recommended Quality Measures, and the Identification of Contractor/Department Risks (August 2, 2004) which provides the legal interpretation of Title 23 Code of Federal Regulations Part 637 Subpart B (23 CFR 637B). Optimal Procedures for Quality Assurance Specifications (Burati et al., 2003) and Transportation Research Circular Number E-C037, Glossary of Highway Quality Assurance Terms (2002), and other references listed in Section 2. 1.4 Application of recommended procedures – This practice is applicable to highway construction materials (e.g., asphalt concrete, portland cement concrete, aggregate base) which are evaluated for quality through characteristics used to assess compliance with project specifications. There may be certain circumstances that limit or preclude use of some aspects of the practice. For example, properties of some materials change substantially with time which precludes the ability to resample the material or make comparisons of material properties measured at different times. 1.5 This practice does not provide recommendations regarding the selection of Quality Characteristics for acceptance decisions. 1.6 This practice does not provide recommendations for frequency of sampling and testing. However, recommendations are provided regarding the minimum number of results that should be used in data validation. 1.7 This practice does not provide guidance on Independent Assurance (IA) plans. managing testing used in acceptance decisions, and consultants and third-party testers that are involved in validation.

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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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