{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/50674"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/50674","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Permanent deformation behavior of unbound granular materials and rutting model development","abstract":"The rutting damage model as incorporated into the AASHTO’s mechanistic-empirical (M-E) pavement design approaches (i.e. Pavement ME Design) was found to produce inadequate rut estimates in unbound aggregate base/subbase layers by discounting the contribution of stress state from the original Tseng and Lytton (1989) model. This research study was aimed at developing a new permanent deformation prediction model that would properly take into account the effects of applied load, applied stress in relation to material’s strength and number of load cycles through a well-established laboratory test matrix for mechanical properties. Sixteen (16) different unbound granular materials commonly used in the state of North Carolina (NC) for pavement subbase/base applications were used in this study. The goal was to accurately estimate the field performances of aggregate base courses through development of a new rutting damage model, referred to as UIUC rutting model. The laboratory phase of this study presented in this thesis considered a target engineered gradation within the lower and upper limits of North Carolina Department of Transportation (NCDOT) base course specification bands with established moisture-density relationship for each of the selected granular materials. Experimental characterizations primarily consisted of imaging based aggregate shape analyses, moisture-density, resilient modulus, shear strength, and permanent deformation tests based on a comprehensive test matrix. The concept of Shear Stress Ratio (SSR) or stress/strength level, which can be derived from Mohr-Coulomb failure criteria, was introduced in this study to properly examine the effects of varying degree of stress/strength to permanent deformation behavior of unbound materials. These test results established a complete database to develop the UIUC rutting model in order to properly capture the effects of stress state and material properties. The model predictions were compared with Pavement ME Design results to justify the validity and performance of the proposed model.","abstract_html":"The rutting damage model as incorporated into the AASHTO’s mechanistic-empirical (M-E) pavement design approaches (i.e. Pavement ME Design) was found to produce inadequate rut estimates in unbound aggregate base/subbase layers by discounting the contribution of stress state from the original Tseng and Lytton (1989) model. This research study was aimed at developing a new permanent deformation prediction model that would properly take into account the effects of applied load, applied stress in relation to material’s strength and number of load cycles through a well-established laboratory test matrix for mechanical properties. Sixteen (16) different unbound granular materials commonly used in the state of North Carolina (NC) for pavement subbase/base applications were used in this study. The goal was to accurately estimate the field performances of aggregate base courses through development of a new rutting damage model, referred to as UIUC rutting model. The laboratory phase of this study presented in this thesis considered a target engineered gradation within the lower and upper limits of North Carolina Department of Transportation (NCDOT) base course specification bands with established moisture-density relationship for each of the selected granular materials. Experimental characterizations primarily consisted of imaging based aggregate shape analyses, moisture-density, resilient modulus, shear strength, and permanent deformation tests based on a comprehensive test matrix. The concept of Shear Stress Ratio (SSR) or stress/strength level, which can be derived from Mohr-Coulomb failure criteria, was introduced in this study to properly examine the effects of varying degree of stress/strength to permanent deformation behavior of unbound materials. These test results established a complete database to develop the UIUC rutting model in order to properly capture the effects of stress state and material properties. The model predictions were compared with Pavement ME Design results to justify the validity and performance of the proposed model.","abstract_has_math":false,"creators":["Chow, Liang Chern"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"M.S.","degree_level":"Thesis","degree_discipline":"Civil Engineering","degree_department":null,"school":null,"contributors":["Tutumluer, Erol"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2014,"date_issued":"2014-09-16T17:25:07Z","date_published":"2014-09-16T17:25:07Z","updated_at":"2026-07-22T22:25:41Z","subjects":["Unbound granular material","Permanent deformation","Rutting","Shear strength","Shear Stress Ratio","Repeated load triaxial testing","Mechanistic-Empirical Pavement Design Guide (MEPDG)","Rutting model"],"languages":["en"],"rights":["Copyright 2014 Liang Chern Chow"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/2142/50674","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Tutumluer, Erol"]},{"key":"dc:creator","label":"Author","values":["Chow, Liang Chern"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2014-09-16T17:25:07Z","2014-08","2014-09-16"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Civil Engineering"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Thesis"]},{"key":"thesis:degree_name","label":"Degree Name","values":["M.S."]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["University of Illinois at Urbana-Champaign"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Unbound granular material","Permanent deformation","Rutting","Shear strength","Shear Stress Ratio","Repeated load triaxial testing","Mechanistic-Empirical Pavement Design Guide (MEPDG)","Rutting model"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 2014 Liang Chern Chow"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/50674"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["The rutting damage model as incorporated into the AASHTO’s mechanistic-empirical (M-E) pavement design approaches (i.e. Pavement ME Design) was found to produce inadequate rut estimates in unbound aggregate base/subbase layers by discounting the contribution of stress state from the original Tseng and Lytton (1989) model. This research study was aimed at developing a new permanent deformation prediction model that would properly take into account the effects of applied load, applied stress in relation to material’s strength and number of load cycles through a well-established laboratory test matrix for mechanical properties. Sixteen (16) different unbound granular materials commonly used in the state of North Carolina (NC) for pavement subbase/base applications were used in this study. The goal was to accurately estimate the field performances of aggregate base courses through development of a new rutting damage model, referred to as UIUC rutting model. The laboratory phase of this study presented in this thesis considered a target engineered gradation within the lower and upper limits of North Carolina Department of Transportation (NCDOT) base course specification bands with established moisture-density relationship for each of the selected granular materials. Experimental characterizations primarily consisted of imaging based aggregate shape analyses, moisture-density, resilient modulus, shear strength, and permanent deformation tests based on a comprehensive test matrix. The concept of Shear Stress Ratio (SSR) or stress/strength level, which can be derived from Mohr-Coulomb failure criteria, was introduced in this study to properly examine the effects of varying degree of stress/strength to permanent deformation behavior of unbound materials. These test results established a complete database to develop the UIUC rutting model in order to properly capture the effects of stress state and material properties. The model predictions were compared with Pavement ME Design results to justify the validity and performance of the proposed model.","Item withdrawn by Mark Zulauf (zulauf@illinois.edu) on 2014-07-25T12:31:32Z Item was in collections: University of Illinois Theses & Dissertations (ID: 1) No. of bitstreams: 2 Chow_Liang Chern.docx: 12435884 bytes, checksum: 3feae39b47820671ae2e335418f089d5 (MD5) Chow_Liang Chern.pdf: 13168309 bytes, checksum: 77f7e3605d75bf75402fdeea26070614 (MD5)","Made available in DSpace on 2014-09-16T17:25:07Z (GMT). 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This research study was aimed at developing a new permanent deformation prediction model that would properly take into account the effects of applied load, applied stress in relation to material’s strength and number of load cycles through a well-established laboratory test matrix for mechanical properties. Sixteen (16) different unbound granular materials commonly used in the state of North Carolina (NC) for pavement subbase/base applications were used in this study. The goal was to accurately estimate the field performances of aggregate base courses through development of a new rutting damage model, referred to as UIUC rutting model. The laboratory phase of this study presented in this thesis considered a target engineered gradation within the lower and upper limits of North Carolina Department of Transportation (NCDOT) base course specification bands with established moisture-density relationship for each of the selected granular materials. Experimental characterizations primarily consisted of imaging based aggregate shape analyses, moisture-density, resilient modulus, shear strength, and permanent deformation tests based on a comprehensive test matrix. The concept of Shear Stress Ratio (SSR) or stress/strength level, which can be derived from Mohr-Coulomb failure criteria, was introduced in this study to properly examine the effects of varying degree of stress/strength to permanent deformation behavior of unbound materials. These test results established a complete database to develop the UIUC rutting model in order to properly capture the effects of stress state and material properties. 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