Performance Characterisation Of Unbound Granular Pavement Materials
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Performance Characterisation Of Unbound Granular Pavement Materials
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Author : ARRB Transport Research, Ltd
language : en
Publisher:
Release Date : 1996
Performance Characterisation Of Unbound Granular Pavement Materials written by ARRB Transport Research, Ltd and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1996 with Gravel roads categories.
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
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Author : Binh Vuong
language : en
Publisher:
Release Date : 2002
Towards Performance Based Specifications For Unbound Granular Pavement Materials written by Binh Vuong and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002 with Gravel roads categories.
Mechanical And Drainage Performance Characterization Of Unbound Granular Materials
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Author : Amin Mneina
language : en
Publisher:
Release Date : 2019
Mechanical And Drainage Performance Characterization Of Unbound Granular Materials written by Amin Mneina and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019 with categories.
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.
Characterisation Of The Deformation Behaviour Of Unbound Granular Materials Using Repeated Load Triaxial Testing
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Author : Negin Zhalehjoo
language : en
Publisher:
Release Date : 2018
Characterisation Of The Deformation Behaviour Of Unbound Granular Materials Using Repeated Load Triaxial Testing written by Negin Zhalehjoo and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018 with Granular materials categories.
"Unbound Granular Materials (UGMs) are used in the base/subbase layers of flexible pavements for the majority of roads around the world. The deterioration of pavements increases with the increase of traffic loadings. To ensure the long-term performance and serviceability of pavement structures through a realistic design, the precise evaluation and comprehensive characterisation of the resilient and permanent deformation behaviour of pavement materials are essential. The present PhD study aims to investigate the characterisation of the resilient and permanent deformation behaviour of four road base UGMs sourced from quarries in Victoria, Australia, using Repeated Load Triaxial (RLT) testing. The triaxial system used in this study is instrumented with four axial deformation measurement transducers to achieve highly precise measurements and to evaluate the effect of instrumentation on the resilient modulus of UGMs. The resilient Poisson's ratio of the studied UGMs is also determined using a radial Hall-Effect transducer. Moreover, a series of permanent deformation tests is performed to precisely characterise the axial and radial permanent deformation behaviour of UGMs and investigate the factors that may significantly influence the accumulated axial and radial permanent deformations. Finally, three permanent deformation models incorporated with a time-hardening procedure are employed to predict the magnitude of permanent strain for multiple stress levels of the RLT test. The predictions using the employed models are then compared against the measured values to evaluate the suitability of the models and to identify the model that best predicts the strain accumulation behaviour of the tested UGMs. While this study focuses on the resilient and permanent deformation behaviour of four Victorian UGMs under repeated loading, the knowledge generated from this comprehensive investigation will contribute towards the global development of more reliable methods for evaluating the long-term performance of pavement structures and minimising road maintenance and repair costs." -- Abstract.
Characterization Of Unbound Granular Materials For Pavements
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Author : Alemgena Alene Araya
language : en
Publisher:
Release Date : 2011
Characterization Of Unbound Granular Materials For Pavements written by Alemgena Alene Araya and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with categories.
Austroads Repeated Load Triaxial Test Method
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Author :
language : en
Publisher:
Release Date : 2000
Austroads Repeated Load Triaxial Test Method written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2000 with categories.
There is a need for performance characterisation indices and performance-based specifications of unbound materials. In addition, there is a need to address issues associated with the non-uniformity of current empirical specifications adopted by different AUSTROADS Member Authorities, with a view to developing more uniform national performance-based specifications using a framework based on mechanistic design procedures. Repeat load triaxial (RLT) testing equipment and test procedures have been developed and evaluated in NSRP Project N&T 9529 - Stage 1) and current specifications for standard unbound materials (Project T&E P133) are being reviewed. The objective of the NSRP Project N.T.&E 9906 during 1999/2000 is to establish a framework for incorporating the RLT test method into performance-based specifications and pavement design of unbound pavement materials. This report describes the interim AUSTROADS test protocols for the determination of permanent deformation and resilient modulus characteristics of unbound pavement materials under drained conditions, which can be used for the purposes of material specifications and pavement design.
Performance Based Characterization Of Virgin And Recycled Aggregate Base Materials
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Author : Mohammad Ahmeduzzaman
language : en
Publisher:
Release Date : 2016
Performance Based Characterization Of Virgin And Recycled Aggregate Base Materials written by Mohammad Ahmeduzzaman and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with categories.
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.
Resilient Modulus Characterisation Of Granular Unbound Pavement Materials Report
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Author : M. Mundy
language : en
Publisher:
Release Date : 1991
Resilient Modulus Characterisation Of Granular Unbound Pavement Materials Report written by M. Mundy and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1991 with Pavements categories.
Unbound Granular Materials
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Author : A. Gomes Correia
language : en
Publisher:
Release Date : 1999
Unbound Granular Materials written by A. Gomes Correia and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1999 with categories.
Pavements Unbound
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Author : Andrew Dawson
language : en
Publisher: CRC Press
Release Date : 2014-09-01
Pavements Unbound written by Andrew Dawson and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014-09-01 with Technology & Engineering categories.
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