Title: DEVELOPMENT OF RATIONAL PAY ADJUSTMENT FACTORS FOR ASPHALT CONCRETE (DISCUSSION, CLOSURE)
Abstract: The effect of variations in asphalt concrete mix properties on pavement performance life is a crucial factor in highway pavement construction. In this study, data from laboratory-prepared samples from the North Oakland-Sutherlin, Castle Rock-Cedar Creek, and Warran-Scappoose projects were analyzed by using the Statistical Interactive Programming System. Regression analysis techniques were used to develop predictive models of pavement performance life based on each of the mix characteristics. The asphalt concrete mixture properties evaluated in this study were percentage of air voids or mix density is found to be the most dominant factor and most highly significant in controlling both fatigue cracking and rutting failure. The mix that had low void content showed remarkably long fatigue life and high performance deformation resistance. The best performance life was obtained when the asphalt content and the amount of fines were at an optimum level. Deviation from optimum content in either of these properties causes a reduction in pavement life. The amount of voids and the optimum asphalt content appeared to be a function of the aggregate type used. The analysis indicates that, for the mix deviations considered, fatigue cracking is more critical to reduction in life than rutting. Therefore, the pay adjustment factors were developed based on fatigue performance life as opposed to a proposed standard pavement life. Summary tables of recommended pay adjustment factors as well as comparisons with others currently used are also included. (Author)
Publication Year: 1983
Publication Date: 1983-01-01
Language: en
Type: article
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