Evaluation of a unified design for asphalt recycling by means of dynamic and fatigue testing Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/j6731635m

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  • Design methods for pavement mixtures containing recycled asphalt concrete have been explored in many studies. Most methods of design are modelled after procedures originally developed for conventional construction with virgin raw materials. The unique properties of aged asphalt as raw material are rarely considered when applying conventional procedures. The approach developed by Witco Chemical assumes that each recycling project requires design and additives to compensate for aging effects. The purpose of this investigation was to ascertain if (1) the simplified method of design developed by Witco Chemical can be employed uniformly in all recycling operations using aged asphalt concrete as the main ingredient of the new mix, and (2) dynamic and fatigue testing are helpful in the evaluation of the recycled mix. The result of the study was an affirmative answer to both questions. A prerequisite for successful recycling, it was found, is the use of a recycling agent which provides for high mixing efficiency to restore the durability and consistency. The experiments carried out were in conjunction with a hot-mix recycling project on Interstate 90 near Ellensburg, Washington. Laboratory tests were performed on samples of the aged asphalt concrete before recycling and on mixtures containing added new aggregate to duplicate the mixtures used at the Ellensburg project. The recycling agents were added to the mixture by direct incorporation into the recovered asphalt (termed reconstituted asphalt) and by addition of the recycling agent and new aggregate to the crushed aged pavement. A mixture was also prepared with a virgin asphalt having the same viscosity at 60 C (140 F) as the reconstituted asphalt. A simple formula was used to determine the optimum asphalt content. This value compared favorably with the average of the Marshall and Hveem mix design values. Resilient moduli, permanent vertical deformations and fatigue life were determined by dynamic testing of the two recycled mixes and the two control mixes. Static tensile strength tests were also performed. The results indicated the resilient modulus for each mix to be within an acceptable range for bituminous pavements. The recycled mixtures showed lower plastic deformations than the completely fluxed reconstituted control mix. The recycled mixes and the reconstituted control mix showed higher fatigue resistance than the virgin control mix. The virgin control and reconstituted mixes showed a higher tensile strength than the recycled mixes. All values were still within an acceptable range for bituminous pavements.
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  • description.provenance : Approved for entry into archive by Patricia Black(patricia.black@oregonstate.edu) on 2013-08-22T15:10:17Z (GMT) No. of bitstreams: 1 WhitcombWilliamG1981.pdf: 853047 bytes, checksum: b34d559cd477bdc457141c70abcd4e0f (MD5)
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