AASHTO R 10:06(2020) Standard Practice for Definition of Terms Related to Quality and Statistics as Used in Highway Construction.
1.1. AASHTO R 10 practice is to provide standard definitions for terms used in specifications, test methods, and the various quality assurance procedures.
2.1. ASTM Standards:
• E177, Standard Practice for Use of the Terms Precision and Bias in ASTM Test Methods
• E691, Standard Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
• E1325, Standard Terminology Relating to Design of Experiments
3.1. It is recommended that AASHTO specifications and procedures, including standard practices, incorporate the following accepted terms as defined. These terms and their definitions are directed primarily to the various quality assurance sampling and acceptance plans. Where a definition conflicts with a standard, the standard will govern.
4.1. acceptable quality level (AQL)—the level of established actual quality for a quality characteristic that is fully acceptable. [For example, when the quality measure used is percent within limits (PWL), the AQL is the established (not estimated) PWL at which the quality characteristic is fully acceptable. Acceptance plans should he designed so that AQL material will receive an expected pay (EP) of 1(X) percent.I
4.2. acceptance—the process whereby all factors used by the agency (i.e., sampling, testing, and inspection) are evaluated to determine the degree of compliance with contract requirements and to determine the corresponding value for a given product.
4.3. acceptance constant (k)—the minimum allowable quality index (Q). IThe acceptance constant k is the acceptance limit associated with the quality index quality measure. In other words, for acceptance. Q must be greater than or equal to k.1
4.4. acceptance limit—rn variables acceptance Plans, the limiting upper or lower value, placed on a quality measure, that will permit acceptance of a lot. jWhile the test values for material samples are evaluated against specification limits and engineering limits, the computed quality level for a specific quality measure is evaluated against the acceptance limit. For example. the minimum allowable PWL called for in a QA specification might he 65 PWL. This is the acceptance limit.
4.5. acceptance itumber (c)—in attributes acceptance plans, the maximum number of defective or nonconforming units in the sample that will permit acceptance of the inspected lot or batch.
4.6. acceptance plan—also called “acceptance sampling plan” or “statistical acceptance plan. “ An agreed-upon process for evaluating the acceptability of a lot of material. It includes: lot size and sample size (i.e.. number of samples), quality measure, acceptance limit(s), evaluation of risks, and pay adjustment provisions.AASHTO R 10 pdf download.