Value Concept for Developing Construction Pay Schedules With Application to Asphalt Paving
Elliott, Robert Patrick
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https://hdl.handle.net/2142/69934
Description
Title
Value Concept for Developing Construction Pay Schedules With Application to Asphalt Paving
Author(s)
Elliott, Robert Patrick
Issue Date
1984
Department of Study
Civil Engineering
Discipline
Civil Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Engineering, Civil
Abstract
The primary objective of this study was to develop and demonstrate a rational procedure for the establishment of pavement construction pay adjustment schedules. A rational procedure was defined as one that would reflect the impact of construction variability on the expected life of the pavement. The procedure was required to consider both the mean and the variability of any construction test parameter used for pay determination as determined from a small number of samples and to include a method for incorporating relationships between the test parameters and the expected life of the pavement. The Value Concept developed meets these criteria.
The secondary objective of the study was to use the developed concept to establish payment schedules for asphalt pavement construction. The efforts taken to meet this objective involved identifying the pavement life effects of asphalt mix variability and determining an "acceptable" level of variability. These were accomplished by analyzing over 2300 field density and extraction tests from past construction projects to determine normal variability and evaluating laboratory test results in conjunction with theoretical pavement behavior models to establish load associated material property-pavement life relationships. The pay schedules developed from these analyses take into account variations in asphalt content, gradation, and density. The schedules were developed based on a 15-70-15 percentile distribution of penalty, 100% (bid price), and bonus pay; but provisions were made that enable highway administrators to modify the schedules for other distributions. A methodology was also developed and used to convert the gradation portion of the schedules from a percent passing and retained basis to a percent passing basis and other sieve sizes. The practicality of the resulting schedules was subsequently evaluated using field test data from past Q.A. projects.
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