State highway agencies and contractors have been implementing quality control/quality assurance (QC/QA) specifications in recent years to advance the quality of hot-mix asphalt (HMA) construction. During their continued development, attributes of these QC/QA specifications have varied among states. The objective of this paper is to provide a compilation of state-of-the-practice in QC/QA for HMA construction and provide recommendations for state highway agencies and contractors when modifying or developing a QC/QA specification. Survey data from 42 state highway agencies and 61 contractors working within 14 states found that a majority of states are using contractor data for acceptance. A review of QC/QA specifications from 40 states found that most states are using plant-produced mix properties, density, and smoothness tests to determine overall quality and acceptance of HMA construction work. A larger number of states are using quality level analysis for specification compliance by estimating percent within limits or percent defective for mix properties and density. Consideration is given to key attributes of a QC/QA specification, including ( a) whether to use contractor or agency data for acceptance, ( b) use of quantity or time for lots, and ( c) testing frequency. State highway agencies and contractors may find this report useful for understanding the components of different QC/QA specifications and furnishing essential information as both parties collaborate during specification development.
Summary of Current Quality Control/ Quality Assurance Practices for Hot-Mix Asphalt Construction
Transportation Research Record
Transportation Research Record: Journal of the Transportation Research Board ; 1632 , 1 ; 22-31
1998-01-01
Article (Journal)
Electronic Resource
English
Summary of Current Quality Control-Quality Assurance Practices for Hot-Mix Asphalt Construction
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