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dc.contributor.authorChai, Gary
dc.contributor.authorKelly, Gregory
dc.contributor.authorChowdhury, Sanaul
dc.contributor.authorLoo, Yew-Chaye
dc.contributor.authorManoharan, Sittam P.
dc.contributor.authorGolding, Andrew
dc.date.accessioned2017-09-14T00:03:50Z
dc.date.available2017-09-14T00:03:50Z
dc.date.issued2015
dc.identifier.urihttp://hdl.handle.net/10072/123526
dc.description.abstractstudy in South East Queensland has found that a large percentage of thin surfaced flexible pavements exhibiting moderate to highly nonlinear subgrade behavior. The nonlinearity effects are major problems encountered in back-analysis of this group of pavements and it can yield back-calculated results with superficially high subgrade stiffness modulus and extremely low stiffness modulus at the road base layer. In other cases, the back-calculation yields very high asphalt stiffness and very low subgrade stiffness modulus. Back-analysis of the falling weight deflectometer bowls can be used to estimate the stiffness modulus of the subgrade from software packages such as EFROMD2. Occasionally, EFROMD2 does not converge mainly because of the certain actual material behavior cannot be handled by the elastic layer model in CIRCLY that is used in EFROMD2. A research has been carried out to analyse the back-calculated results of EFROMD2 and CIRCLY5 for pavement structures that possess highly nonlinear subgrade behavior. The study shows that the EFROMD2 computer program over predicts the asphalt stiffness and under predicts the subgrade stiffness. On the contrary, CIRCLY5 program generates back-calculated results with very high subgrade stiffness and very low stiffness modulus in the road base layer. The issues pertaining to the back-calculation of flexible pavements that posess highly nonlinear subgrade behaviour is presented. A simple approach to compute the degree of subgrade nonlinearity will be introduced.
dc.description.peerreviewedYes
dc.languageEnglish
dc.publisherInternational Committee on Road and Airfield Pavement Technology
dc.publisher.placeChina
dc.publisher.urihttp://www2.avs.org/conferences/ICPT2015/
dc.relation.ispartofconferencenameICPT 2015
dc.relation.ispartofconferencetitleProceedings of the 9th International Conference on Road and Airfield Pavement Technology
dc.relation.ispartofdatefrom2015-08-09
dc.relation.ispartofdateto2015-08-13
dc.relation.ispartoflocationDalian, China
dc.subject.fieldofresearchTransport Engineering
dc.subject.fieldofresearchcode090507
dc.titleIssues pertaining to Backcalculation of Stiffness Modulus in Flexible Pavements with Highly Nonlinear Subgrade Materials
dc.typeConference output
dc.type.descriptionE1 - Conferences
dc.type.codeE - Conference Publications
dc.description.versionPublished
gro.facultyGriffith Sciences, Griffith School of Engineering
gro.rights.copyright© 2015 National University of Singapore. The attached file is reproduced here in accordance with the copyright policy of the publisher. Please refer to the conference's website for access to the definitive, published version.
gro.hasfulltextFull Text
gro.griffith.authorLoo, Yew-Chaye
gro.griffith.authorChowdhury, Sanaul H.
gro.griffith.authorChai, Gary K.
gro.griffith.authorKelly, Gregory


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