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原文传递 Hot Mix Asphalt, Gradation Acceptance, Review of QC/QA Data 2000 Through 2004. Final rept.

题名：	Hot Mix Asphalt, Gradation Acceptance, Review of QC/QA Data 2000 Through 2004. Final rept.
作者：	CHAVEZ, E.
关键词：	Hot-mix-paving-mixtures; Asphalts-; *Gradation-.;Quality-control; Quality-assurance; Performance-evaluation; Density-; Data-collection.
摘要：	This report analyzes the Quality Control/Quality Assurance (QC/QA) data for hot mix asphalt using gradation acceptance awarded in the years 2000 through 2004. Analysis of the overall project performance is accomplished by reviewing the Calculated Pay Factor Composite (CPFC) and Incentive/Disincentive Payments (I/DP) calculations. A detailed analysis of each of the test elements: mat density, percent asphalt, gradation, and joint density is also presented in tables, figures, and sub-reports. Various data groupings are used to evaluate the data including: year, region, & grading. Continued improvements can be measured for the hot mix asphalt in the years 2000 through 2004. When evaluating the overall results for the projects the Calculated Pay Factor Composite has increased 0.007 over the five years. The pay factors for the individual elements have increased in the mat density, gradation, and joint density elements. The pay factor for the asphalt content element has remained constant. Likewise, the quality levels have increased for each of the elements except for that of the asphalt content which showed a slight decrease. When ranking the elements by quality levels we find that the ranking is the same as the importance given the element, the W factor. The mat density element has the best quality levels. Next best quality levels are reported in the percent asphalt element. The gradation element continues to rank below that of the mat density and percent asphalt elements. After the initial two years of testing the joint density element has the lowest reported quality levels of any of the elements. When analyzing the test elements by grading we see that all of the quality levels are improving or at least remaining constant. The only exception to this is in the percent asphalt results for grading SX which showed a decline over five years. However, the results for the last two years have been very close to those for grading S. The results for the joint density element by grading after two years are mixed. The quality levels for grading S have improved. The results for grading SX decreased. More test results are needed to better analyze this element.
报告类型：	科技报告