Development of an asphaltic concrete overlay design procedure for rigid pavements in Indiana
Abstract
This report contains information required to design asphaltic concrete overlays for continuously reinforced concrete (CRC), CRC composite, jointed reinforced concrete (JRC), and JRC composite pavements. A comprehensive nondestructive testing program was planned and implemented to obtain deflection information on 13 CRC and 30 JRC pavement test sections during two different test periods--spring and summer/fall. This deflection data, along with traffic, subgrade, pavement cross section, age, climate, condition, and serviceability data, were used as input into the design techniques. Two design techniques were used for the CRC pavements. The first involved a statistical model to calculate overlay thickness from California Bearing Ratio (CBR) and Present Serviceability Index (PSI). This model should be used with caution because of the small data set used in its development. The second was a structural method based upon the American Association of State Highway and Transportation Officials (AASHTO) Guide for the Design of Pavement Structures using data taken from the test sections. Two techniques were used for JRC pavements. The first involved two statistical regression models which predict overlay thickness using test section data showing promise. One model is primarily used for structural overlays and the other for functional overlays. Guidelines are given to aid a designer in selecting the appropriate model. The second technique used the AASHTO Design Guide and the data collected as the basis for determining overlay thickness. It was concluded that all techniques investigated could be used to design overlays if the designer is aware of the limitations. The primary limitations are (1) that statistical techniques must be used within the inference space (variable ranges) of the data from which it was developed and (2) that the AASHTO method is a structural method that cannot be used when performance is the primary reason that the overlay is required.
Degree
Ph.D.
Advisors
White, Purdue University.
Subject Area
Civil engineering
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