Analysis of Laboratory Testing Results and Performance Evaluation of Recycled Asphalt Pavements (Flexural Fatigue, Creep Compliance)
Zelaya, Maria Margarita
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https://hdl.handle.net/2142/69950
Description
Title
Analysis of Laboratory Testing Results and Performance Evaluation of Recycled Asphalt Pavements (Flexural Fatigue, Creep Compliance)
Author(s)
Zelaya, Maria Margarita
Issue Date
1985
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
Extensive laboratory testing was conducted to evaluate the fundamental properties of recycled materials. The major laboratory tests included are: repeated beam flexural fatigue, creep compliance, indirect tensile strength, Marshall mixture design and asphalt cement properties.
A factorial experimental design which includes four factors at two levels was conducted. The levels of temperature are 40(DEGREES)F and 70(DEGREES)F, the levels of the amount of recycled material in the mix are 30% and 100%. Two modifiers were added, Cyclogen M and Paxole 1009. Reclaimed materials were obtained from two highways, one near the city of Decatur, Illinois and the other near Peoria, Illinois.
The results of the experimental design indicate that the compliance responses in terms of stiffness of the mix is affected by the amount of recycled materials in the mix. The slope of the master creep compliance curve is not affected by any of the factors studied here. The permanent deformation parameters ALPHA and GNU of the rutting model from the VESYS program were studied. Significant effects on ALPHA were found to be temperature, the interaction of modifier type and reclaimed material source and the three factor interaction of temperature, modifier type and reclaimed material source. The temperature main effect is the only significant variable on GNU. The recycled materials did not show any distinctly different relationship for ALPHA and GNU than new materials mixes as each mix had its own permanent deformation parameters. The results of laboratory fatigue tests show that the factors influencing K(,1) and K(,2) are modifier type, amount of recycled material and source of reclaimed material. Interactions between these factors are also present. The flexural fatigue test technique is capable to distinguish differences between different recycled mixes. Indirect tensile strength obtained at 72(DEGREES)F at a rate of loading of 2 inches per minute was found to be highly related to stiffness of the mix.
Performance prediction indicates that the Fairmont mix, representing a standard mix has the best fatigue and permanent deformation performance when compared to the recycled mixes. To satisfy cracking characteristics of the recycled mixes, thickness of the asphalt layer has to be increased from 6 in. to 12.5 in. Rut depth of the asphalt layer for recycled mixes may be critical for certain mixtures and should be carefully evaluated.
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