详情

原文传递 Layer Coefficients for New and Reprocessed Asphaltic Mixes

题名：	Layer Coefficients for New and Reprocessed Asphaltic Mixes
作者：	H. U. Bahia, Assistant Professor; P. J. Bosscher, Professor; J. Christensen, Research Assistant; and Yu Hu, Research Assistant
关键词：	LAYER COEFFICIENTS, RESILIENT MODULUS, PAVEMENT DESIGN, RUTTING, FATIGUE. CRACKING
摘要：	The objective of this study is to determine layer coefficients for selected types of asphalt mixtures used in Wisconsin including LV. MV, HV, SMA, SHRP, pulverize-Relay mixtures, Mill-Relay mixtures, asphalt base mixtures and recycled PCC-AC mixes combined at different percentages. The traditional method of resilient modulus was used as well as relating rutting damage functions to the layer coefficients. Tests were conducted in the field to measure deflections of actual pavement layers, as well as in the laboratory to measure the responses of samples under conditions that mimic field conditions. The results of the study show that laboratory and field measurements are consistent with the materials tested. The resilient modulus values measured show that different layer coefficients should be given to the recycled and reprocessed materials depending on the nature of the components. A list of layer coefficients is proposed for pavement design. The results of the asphalt materials did not show that there are significant differences in resilient modulus of asphalt mixtures tested; thus, layer coefficients for the asphalt mixtures, derived based on the resilient modulus, are similar for all asphalt mixtures. The results of laboratory rutting tests, however, were found to give different ranking of die materials, compared to the ranking using the resilient modulus results, it is observed that asphalt mixtures vary significantly in their rutting behavior in the laboratory and thus can have different contribution to pavement performance. It is recommended that proposed layer coefficients be used with caution due to lack of direct relation to materials damage behavior. A conceptual procedure for deriving layer coefficients based on resilient modulus, rutting behavior, and fatigue behavior is proposed in the study. The study recommends continued work to verify the proposed procedure and modify the layer coefficients to account for the damage behavior of pavement materials including fatigue and thermal cracking.
报告类型：	科技报告