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Abstract:This study first presents the historical background and an overview of the technical basis for Oregon's current method of statistical quality control. It then evaluates the benefits that the State of Oregon receives by paying out bonuses to contractors on asphalt concrete paving jobs and makes recommendations for improving quality control methods. This problem was approached with the realization that an accurate accounting of costs and benefits was not possible. However, by combining two approaches: statistical analysis of test data; and a questionnaire to field personnel, it became clear from both viewpoints that there are both tangible and intangible benefits that outweigh the costs.
The questionnaire revealed that project managers who work regularly with contractors under this system generally believe that it improves the atmosphere of cooperation between the state and contractors and also is effective in improving pavement quality. The statistical analysis demonstrates that relative compaction has increased by at least 1.1% since the system was initiated. This improvement in compaction alone is estimated to increase pavement fatigue life by an average of approximately 16% while the average bonus is only 1.7% of the original bid price. An analysis is also made of recent paving projects showing signs of early distress. This information and suggestions from field personnel are combined to form recommendations for improving the pay adjustment system.
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