United States Department of Transportation
i
Comprehensive Testing Guidelines to Increase Efficiency in INDOT Operations [Technical Summary]
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2012-08-01
[PDF-753.66 KB]
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Edition:Technical summary.
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NTL Classification:NTL-PLANNING AND POLICY-PLANNING AND POLICY;NTL-HIGHWAY/ROAD TRANSPORTATION-Construction and Maintenance;NTL-HIGHWAY/ROAD TRANSPORTATION-Pavement Management and Performance;NTL-HIGHWAY/ROAD TRANSPORTATION-Materials;
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Abstract:When the Indiana Department of Transportation designs a pavement project, a decision for QC/QA (Quality Control/ Quality Assurance) or non–QC/QA is made solely based on the quantity of pavement materials to be used in the project. Once the pavement project is designated as QC/QA, quality characteristic values through a certain testing requirement (test types and sample sizes) are obtained and evaluated in comparison with certain testing criteria to ensure that the constructed pavement will meet the pavement design life. In the current INDOT practice of pavement materials testing, a testing requirement (QC/QA or non–QC/QA) is uniformly applied based on pavement quantity, regardless of road condition factors, such as traffic load, climate, and speed limit, that largely affect the pavement lifetime realistically. However, the actual risk will vary depending on the severity of road conditions; severe climate and heavily loaded traffic cause certain roads to fail much earlier than their designated design life, while other roads last much longer. There is an opportunity here to balance required testing resources by differentiating testing requirements for different road conditions. Stricter testing requirements for roads under severe conditions will reduce the error of placing out-of-specification materials in the field. However, since there will be various testing requirements that achieve a certain degree of risk, it is possible to classify road sections for different intensities of testing requirement. For example, a reduced testing requirement (or even non–QC/QA) may suffice for low and middle volume traffic roads as long as the requirement achieves the target risk level.
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