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Heuristic principles to predict the effect of crumb rubber gradation on asphalt binder rutting performance
, K.P. Biligiri
Published in American Society of Civil Engineers (ASCE)
2017
Volume: 29
   
Issue: 8
Abstract
The objective of this study was to employ an artificial neural network (ANN) to predict asphalt-rubber (AR) rutting performance characteristics using binder properties, crumb rubber (CR) gradations, and mechanical test parameters. The scope included advanced asphalt binder rheological characterization using a dynamic shear rheometer (DSR), encompassing preparation of a total of 18 laboratory-blended AR binders with two base binders and nine CR gradations, totaling over 2,200 data points. Principles of ANNs were used to predict the three AR binder performance parameters: η, G*/sinδ, and tanδ. Eight input parameters constituting test temperature and frequency, five CR gradation components, and base binder viscosity were employed to develop the ANN model. A back-propagation learning algorithm with scaled conjugate gradient (SCG) as the training algorithm in a feed-forward, two-hidden-layer neural network with seven and three neurons, respectively, was chosen as the best ANN architecture. The statistical goodness of fit measures R for the total data set were, respectively, 0.994, 0.997, and 0.977 for η,G*/sinδ, and tanδ. ANN modeling conceptualized as part of the study indicated that rubber inclusions in asphalt binders would aid in the improvement of the materials' rutting resistance. The magnitudes of weights and biases provided in this study for the eight chosen AR binder material input parameters could be well utilized in predicting the three binder material performance parameters. Overall, it is envisaged that the algorithm developed in this research pertinent to asphalt binders' advanced rheological characterization would further the state of the art in designing rut-resistant rubber modified asphalts. © 2017 American Society of Civil Engineers.
About the journal
JournalData powered by TypesetJournal of Materials in Civil Engineering
PublisherData powered by TypesetAmerican Society of Civil Engineers (ASCE)
ISSN08991561
Open AccessNo