Author: ARRB Transport Research, Ltd
Publisher:
ISBN:
Category : Gravel roads
Languages : en
Pages : 70
Book Description
This document contains the proceedings of the National workshop on Performance characterisation of unbound granular pavement materials, held in Australia 27 April 1995. The session titles are as follows: Session 1 - AUSTROADS industry perspective; Session 2 - New technologies and developments; Sessions 3 & 4 - Facilitated forums and experimental panel; Session 5 - Facilitated forum. The papers presented at the sessions are as follows: Session 1 - Partnerships between Austroads and industry in technical developments (Midgley, L); Industry partnerships in technical development (Yates, T). Session 2 - An overview of AUSTROADS pavement design and analysis procedures (Jameson, G); An overview of mechanistic testing of unbound granular pavement materials (Andrews, B). Sessions 3 & 4 - 'Identifying the problems' and ;Looking for solutions' (Midgley, L, Jameson, G and Yates, T). Session 5 - "Where to from here" (Gordon, R, facilitator).
Performance Characterisation of Unbound Granular Pavement Materials
Author: ARRB Transport Research, Ltd
Publisher:
ISBN:
Category : Gravel roads
Languages : en
Pages : 70
Book Description
This document contains the proceedings of the National workshop on Performance characterisation of unbound granular pavement materials, held in Australia 27 April 1995. The session titles are as follows: Session 1 - AUSTROADS industry perspective; Session 2 - New technologies and developments; Sessions 3 & 4 - Facilitated forums and experimental panel; Session 5 - Facilitated forum. The papers presented at the sessions are as follows: Session 1 - Partnerships between Austroads and industry in technical developments (Midgley, L); Industry partnerships in technical development (Yates, T). Session 2 - An overview of AUSTROADS pavement design and analysis procedures (Jameson, G); An overview of mechanistic testing of unbound granular pavement materials (Andrews, B). Sessions 3 & 4 - 'Identifying the problems' and ;Looking for solutions' (Midgley, L, Jameson, G and Yates, T). Session 5 - "Where to from here" (Gordon, R, facilitator).
Publisher:
ISBN:
Category : Gravel roads
Languages : en
Pages : 70
Book Description
This document contains the proceedings of the National workshop on Performance characterisation of unbound granular pavement materials, held in Australia 27 April 1995. The session titles are as follows: Session 1 - AUSTROADS industry perspective; Session 2 - New technologies and developments; Sessions 3 & 4 - Facilitated forums and experimental panel; Session 5 - Facilitated forum. The papers presented at the sessions are as follows: Session 1 - Partnerships between Austroads and industry in technical developments (Midgley, L); Industry partnerships in technical development (Yates, T). Session 2 - An overview of AUSTROADS pavement design and analysis procedures (Jameson, G); An overview of mechanistic testing of unbound granular pavement materials (Andrews, B). Sessions 3 & 4 - 'Identifying the problems' and ;Looking for solutions' (Midgley, L, Jameson, G and Yates, T). Session 5 - "Where to from here" (Gordon, R, facilitator).
Towards Performance Based Specifications for Unbound Granular Pavement Materials
Author: Binh Vuong
Publisher:
ISBN: 9781876592073
Category : Gravel roads
Languages : en
Pages : 141
Book Description
Publisher:
ISBN: 9781876592073
Category : Gravel roads
Languages : en
Pages : 141
Book Description
Unbound Granular Materials
Characterization of unbound granular materials for pavements
Author: Alemgena Alene Araya
Publisher:
ISBN: 9789085707318
Category :
Languages : en
Pages : 183
Book Description
Publisher:
ISBN: 9789085707318
Category :
Languages : en
Pages : 183
Book Description
Mechanical and Drainage Performance Characterization of Unbound Granular Materials
Author: Amin Mneina
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
Book Description
The drainage performance of unbound granular material (UGM) is an important consideration in pavement design because the presence of excess moisture in UGM layers can eventually lead to premature failures. Recently, transportation agencies have been evaluating their granular base and subbase drainage and mechanical performance to ensure sufficient drainage capacity while maintaining adequate structural support to produce more sustainable pavement structures. Linking performance to UGM construction specification requires accurate characterization of UGM's mechanical and drainage performance and how physical and gradation parameters affect such performance. These evaluations led to an update of the specification requirements of UGM in many jurisdictions including Manitoba. In this research, constant head hydraulic conductivity, resilient modulus, permanent deformation, double ring infiltrometer, and falling weight deflectometer test methods were used in laboratory and field investigations. These tests were conducted to characterize the drainage and mechanical performance of ten UGM samples representing four different gradation bands. The laboratory test results were also used to investigate the reliability of the estimated hydraulic conductivity from the Moulton prediction model and from the Enhanced Integrated Climatic Model (EICM). Test results showed an improvement in resilient modulus and drainage quality for samples in gradation bands that specify larger maximum aggregate size and limited fines. A statistical analysis of the test results showed that D10 larger than 0.2mm and D60 larger than 8mm would guarantee higher stiffness and better drainage performance with a time-to drain of less than 5days for typical pavement cross-sections and a resilient modulus value exceeding 200MPa. The Moulton prediction model was found to provide a better approximation of hydraulic conductivity of the materials included in this study, while the EICM model was found to significantly overestimate the hydraulic conductivity for most of the samples.
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
Book Description
The drainage performance of unbound granular material (UGM) is an important consideration in pavement design because the presence of excess moisture in UGM layers can eventually lead to premature failures. Recently, transportation agencies have been evaluating their granular base and subbase drainage and mechanical performance to ensure sufficient drainage capacity while maintaining adequate structural support to produce more sustainable pavement structures. Linking performance to UGM construction specification requires accurate characterization of UGM's mechanical and drainage performance and how physical and gradation parameters affect such performance. These evaluations led to an update of the specification requirements of UGM in many jurisdictions including Manitoba. In this research, constant head hydraulic conductivity, resilient modulus, permanent deformation, double ring infiltrometer, and falling weight deflectometer test methods were used in laboratory and field investigations. These tests were conducted to characterize the drainage and mechanical performance of ten UGM samples representing four different gradation bands. The laboratory test results were also used to investigate the reliability of the estimated hydraulic conductivity from the Moulton prediction model and from the Enhanced Integrated Climatic Model (EICM). Test results showed an improvement in resilient modulus and drainage quality for samples in gradation bands that specify larger maximum aggregate size and limited fines. A statistical analysis of the test results showed that D10 larger than 0.2mm and D60 larger than 8mm would guarantee higher stiffness and better drainage performance with a time-to drain of less than 5days for typical pavement cross-sections and a resilient modulus value exceeding 200MPa. The Moulton prediction model was found to provide a better approximation of hydraulic conductivity of the materials included in this study, while the EICM model was found to significantly overestimate the hydraulic conductivity for most of the samples.
Resilient Modulus Characterisation of Granular Unbound Pavement Materials. Report
Author: M. Mundy
Publisher:
ISBN: 9780646066066
Category : Pavements
Languages : en
Pages : 43
Book Description
Publisher:
ISBN: 9780646066066
Category : Pavements
Languages : en
Pages : 43
Book Description
Performance Based Characterization of Virgin and Recycled Aggregate Base Materials
Author: Mohammad Ahmeduzzaman
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
Book Description
Characterization of the effect of physical properties on the performance such as stiffness and drainage of unbound granular materials is necessary in order to incorporate them in pavement design. The stiffness, deformation and permeability behaviour of unbound granular materials are the essential design inputs for Mechanistic-Empirical Pavement Design Guide as well as empirical design methods. The performance based specifications are aimed to design, and construct a durable and cost effective material throughout the design life of a pavement. However, the specification varies among jurisdiction depending on the historical or current practice, locally available materials, landform, climate and drainage. A literature review on the current unbound granular materials virgin and recycled concrete aggregate base construction specification has been carried out in this study. Resilient modulus, permanent deformation and permeability tests have been carried out on seven gradations of materials from locally available sources. Resilient modulus stiffness of unbound granular material at two different conditioning stress level have been compared in the study. The long term deformation behaviour has also been characterized from results of the permanent deformation test using shakedown approach, dissipated energy approach and a simplified approach. The results show improvement in resilient modulus and permanent deformation for the proposed specification compared to the currently used materials as a results of reduced fines content, increased crush count and inclusion of larger maximum aggregate size into the gradation. A significant effect of particle packing on permeability of granular materials have also been found, in addition to the effect of fines.
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
Book Description
Characterization of the effect of physical properties on the performance such as stiffness and drainage of unbound granular materials is necessary in order to incorporate them in pavement design. The stiffness, deformation and permeability behaviour of unbound granular materials are the essential design inputs for Mechanistic-Empirical Pavement Design Guide as well as empirical design methods. The performance based specifications are aimed to design, and construct a durable and cost effective material throughout the design life of a pavement. However, the specification varies among jurisdiction depending on the historical or current practice, locally available materials, landform, climate and drainage. A literature review on the current unbound granular materials virgin and recycled concrete aggregate base construction specification has been carried out in this study. Resilient modulus, permanent deformation and permeability tests have been carried out on seven gradations of materials from locally available sources. Resilient modulus stiffness of unbound granular material at two different conditioning stress level have been compared in the study. The long term deformation behaviour has also been characterized from results of the permanent deformation test using shakedown approach, dissipated energy approach and a simplified approach. The results show improvement in resilient modulus and permanent deformation for the proposed specification compared to the currently used materials as a results of reduced fines content, increased crush count and inclusion of larger maximum aggregate size into the gradation. A significant effect of particle packing on permeability of granular materials have also been found, in addition to the effect of fines.
Analyses Relating to Pavement Material Characterizations and Their Effects on Pavement Performance
Author:
Publisher:
ISBN:
Category : Pavements
Languages : en
Pages : 228
Book Description
This report presents the analysis conducted on relating pavement performance or response measures and design considerations to specific pavement layers utilizing data contained in the Long-Term Pavement Performance Program National Information Management System. The goal of this research activity was to enhance implementation and use of the 1993 AASHTO Design Guide through improved materials characterizations. Specifically, the focus of this research activity was to identify the differences that exist between laboratory measured and backcalculated resilient moduli; determine the applicability of the C values, drainage coefficients, and relative damage factors that are included in the Design Guide; and provide procedures to adequately consider the seasonal variation of material properties as related to flexible pavement designs. Based on these results, design pamphlets have been prepared in support of the AASHTO Design Guide. These design pamphlets are documented and included in other reports. The results reported here form the basis and background for those design pamphlets.
Publisher:
ISBN:
Category : Pavements
Languages : en
Pages : 228
Book Description
This report presents the analysis conducted on relating pavement performance or response measures and design considerations to specific pavement layers utilizing data contained in the Long-Term Pavement Performance Program National Information Management System. The goal of this research activity was to enhance implementation and use of the 1993 AASHTO Design Guide through improved materials characterizations. Specifically, the focus of this research activity was to identify the differences that exist between laboratory measured and backcalculated resilient moduli; determine the applicability of the C values, drainage coefficients, and relative damage factors that are included in the Design Guide; and provide procedures to adequately consider the seasonal variation of material properties as related to flexible pavement designs. Based on these results, design pamphlets have been prepared in support of the AASHTO Design Guide. These design pamphlets are documented and included in other reports. The results reported here form the basis and background for those design pamphlets.
Pavements Unbound
Author: Andrew Dawson
Publisher: CRC Press
ISBN: 9781439833803
Category : Technology & Engineering
Languages : en
Pages : 388
Book Description
Nearly all highway, airport, dock and industrial pavements contain large quantities of untreated aggregate in the form of unbound pavement layers. In many pavements, which are lightly or moderately trafficked, crushed rock or gravel derived aggregates comprise the majority of the construction or, in the case of unsealed pavements, all of the structure. This book provides studies of the performance and description of this material that will help the reader to better understand its characteristics and behaviour both alone and as part of the pavement structure it forms. This work will be useful to practitioners, policy makers, researchers and students. It forms a sequel to the earlier book "Unbound Aggregates in Road Construction" also published by Balkema
Publisher: CRC Press
ISBN: 9781439833803
Category : Technology & Engineering
Languages : en
Pages : 388
Book Description
Nearly all highway, airport, dock and industrial pavements contain large quantities of untreated aggregate in the form of unbound pavement layers. In many pavements, which are lightly or moderately trafficked, crushed rock or gravel derived aggregates comprise the majority of the construction or, in the case of unsealed pavements, all of the structure. This book provides studies of the performance and description of this material that will help the reader to better understand its characteristics and behaviour both alone and as part of the pavement structure it forms. This work will be useful to practitioners, policy makers, researchers and students. It forms a sequel to the earlier book "Unbound Aggregates in Road Construction" also published by Balkema