Towards Performance Based Specifications For Unbound Granular Pavement Materials
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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.
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).
Development Of Performance Based Specifications For Unbound Granular Materials
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Author : Binh Vuong
language : en
Publisher:
Release Date : 2003
Development Of Performance Based Specifications For Unbound Granular 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 2003 with Materials categories.
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.
Sustainable Alternative Materials In Unbound Granular Layers Of Pavement Structures
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Author : Adam C. Schneider
language : en
Publisher:
Release Date : 2017
Sustainable Alternative Materials In Unbound Granular Layers Of Pavement Structures written by Adam C. Schneider and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017 with Asphalt categories.
In Part 1 of this thesis, reclaimed cement concrete (commonly referred to as recycled concrete aggregate or RCA) and reclaimed asphalt pavement (RAP) are investigated as potential alternative construction materials for Granular B Type II subbase fill. Ontario Provincial Standard Specification (OPSS) 1010 currently allows the common use of processed reclaimed construction materials in a variety of road base, subbase and asphaltic concrete layers, with the notable exception of Granular B Type II, which at present may only include 100% crushed bedrock, talus, iron blast furnace slag or nickel slag. As more restrictions are placed on zoning and approvals for new natural aggregate extraction sites in Ontario, there is a need to better understand the performance of materials such as RCA and RAP as economically beneficial potential aggregate sources for granular base and subbase fill layers. An experimental program was created to assess and analyze the performance characteristics of a series of different subbase test mixtures incorporating RCA and/or RAP, either pure or blended with crushed bedrock, and the impact of the inclusion of these materials when compared to a conventional 100% crushed bedrock test mix meeting OPSS 1010 requirements for Granular B Type II. The performance characteristics to be assessed were field compactibility, gradations before and after field compaction, physical properties, standard and modified Proctor tests, California Bearing Ratio (CBR), permeability, resilient moduli and lightweight deflectometer (LWD) resilient moduli. Field testing programs conducted at Quarry 1 in Ottawa, Ontario and Quarry 2 in Burlington, Ontario indicate that the subbase test mixtures meeting OPSS Granular B Type II gradation requirements and incorporating different proportions of crushed rock, RCA and/or RAP exhibit similar field rolling compactibility relative to 100% crushed rock. Grain size analysis testing showed some aggregate breakdown in multiple test mixes, with only minimal increases in material passing the 75 μm sieve, which is crucial to preserving permeability and drainage characteristics. Tests using a lightweight deflectometer (LWD) were subject to substantial variability but indicated that mixes using elevated levels of RCA (50% and 100%) can potentially have lower in-situ moduli compared to the other blends tested. Laboratory tests indicate that high replacement levels of RCA can be used in subbase materials as a substitute for 100% crushed rock while maintaining good water permeability characteristics and similar or higher resilient moduli in blends incorporating RCA and/or RAP. CBR testing results were similar across all test blends incorporating crushed rock and RCA, but also indicated that the inclusion of 30% RAP can potentially reduce the bearing capacity of the granular material by approximately 30-40% in comparison to all other blends which do not contain RAP. Based on the overall results of this study, RCA and RAP appear to be capable of successfully substituting for natural aggregates in Granular B Type II in a range of compositional proportions. It is recommended that test sections should be completed on highway contracts with subbase mixture blends incorporating RCA and/or RAP in order to verify their performance in pavement structures in the field. In Part 2 of this thesis, foam glass lightweight aggregates (LWA) are investigated as a potential pavement engineering design alternative in order to mitigate roadway loading impacts upon underlying subgrade soils while promoting the sustainable and economical use of recycled waste glass. Foamyna Canada Inc. supplied the Centre for Pavement and Transportation Technology (CPATT) with two foam glass lightweight aggregate materials, designated in this thesis as LWA-A and LWA-B. Physical properties testing was carried out by CPATT, including grain size analysis, crushed particle content, flat and elongated particle content, Micro-Deval abrasion resistance, cyclic freezing-and-thawing resistance and resilient modulus testing procedures. These procedures were conducted in order to evaluate the LWA materials against locally applicable standards, namely Ontario Provincial Standard Specification document OPSS 1010 as currently used by the Ministry of Transportation of Ontario (MTO). The laboratory testing detailed in Part 2 indicates that both LWA-A and LWA-B have a very consistent and repeatable gradation with a high percentage of coarse aggregates. Both foam glass materials have very high crushed particle contents and very low flat and elongated particle contents. Micro-Deval abrasion resistance, freeze-and-thaw resistance and resilient moduli were also excellent for both materials, while relative density testing indicated LWA material specific gravity values which were substantially lower than that of water. However, it was found that the gradations of these two tested materials do not satisfy the existing requirements of OPSS 1010, which were developed for natural aggregates and, as currently constituted, may not be appropriately adapted to artificial lightweight aggregates. The coarse nature of the LWA materials would be highly beneficial to ensure the stability of the granular layers and prevent upward capillary water movement into other layers of the pavement structure. Pavement design calculations were carried out using the AASHTO 1993 empirical design procedure and found that utilizing foam glass LWA as a lightweight subgrade replacement fill material can result in substantially leaner pavement structures as compared to the use of conventional expanded polystyrene (EPS) geofoam blocks as an artificial subgrade. A life-cycle cost analysis (LCCA) procedure carried out on these pavement designs showed that the use of foam glass LWA as a lightweight fill material underlying pavement can result in overall cost savings of over 30 percent relative to pavement structures which are underlain by EPS geofoam. Overall, the two tested LWA materials showed excellent physical and mechanical characteristics, and would be suitable for use in pavement structures as innovative lightweight and environmentally friendly alternatives to natural aggregate materials.
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.
Unbound Aggregates In Roads
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Author : R.H. Jones
language : en
Publisher: Butterworth-Heinemann
Release Date : 2016-04-20
Unbound Aggregates In Roads written by R.H. Jones and has been published by Butterworth-Heinemann this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016-04-20 with Technology & Engineering categories.
Unbound Aggregates in Roads contains the proceedings of the International Symposium on Unbound Aggregates in Roads (UNBAR3) held at the University of Nottingham, England, on April 11-13, 1989. The papers focus on unbound aggregates used in road construction and cover topics ranging from drainage and permeability to placement and compaction of unbound aggregates, design philosophy, specification, and compliance. This book consists of 49 chapters divided into eight sections and opens with an overview of the functions of unbound aggregates in roads, followed by a discussion on the mechanical properties of different aggregates and theoretical aspects of granular materials. The following chapters focus on granular drainage layers in pavement foundations; residual stresses caused by compaction in granular materials; and alternative materials for road construction such as steel slags and natural and waste materials. The use of unbound road aggregates in various countries such as Italy, France, Germany, and Portugal is also considered. This monograph will be a useful resource for designers, aggregate producers, contractors, specification writers, and materials engineers.
Proceedings Of The 16th International Conference On Soil Mechanics And Geotechnical Engineering
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Author : The Organizing Committee of the 16th ICSMGE
language : en
Publisher: IOS Press
Release Date : 2005-09-12
Proceedings Of The 16th International Conference On Soil Mechanics And Geotechnical Engineering written by The Organizing Committee of the 16th ICSMGE and has been published by IOS Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005-09-12 with Technology & Engineering categories.
The 16th ICSMGE responds to the needs of the engineering and construction community, promoting dialog and exchange between academia and practice in various aspects of soil mechanics and geotechnical engineering. This is reflected in the central theme of the conference 'Geotechnology in Harmony with the Global Environment'. The proceedings of the conference are of great interest for geo-engineers and researchers in soil mechanics and geotechnical engineering. Volume 1 contains 5 plenary session lectures, the Terzaghi Oration, Heritage Lecture, and 3 papers presented in the major project session. Volumes 2, 3, and 4 contain papers with the following topics: Soil mechanics in general; Infrastructure and mobility; Environmental issues of geotechnical engineering; Enhancing natural disaster reduction systems; Professional practice and education. Volume 5 contains the report of practitioner/academic forum, 20 general reports, a summary of the sessions and workshops held during the conference.
Bearing Capacity Of Roads Volume 2
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Author : A. Gomes Correia
language : en
Publisher: CRC Press
Release Date : 2020-12-18
Bearing Capacity Of Roads Volume 2 written by A. Gomes Correia and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020-12-18 with Technology & Engineering categories.
This book is an outcome of the sixth conference on bearing capacity of roads and airfield held in Lisbon, Portugal. It covers the following topics: bearing capacity policies, concepts, costs and condition surveys; analysis and modelling; design and environmental effects; and asphalt mixtures.
Estimating Stiffness Of Subgrade And Unbound Materials For Pavement Design
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Author : Anand J. Puppala
language : en
Publisher: Transportation Research Board
Release Date : 2008
Estimating Stiffness Of Subgrade And Unbound Materials For Pavement Design written by Anand J. Puppala and has been published by Transportation Research Board this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008 with Technology & Engineering categories.
At head of title: National Cooperative Highway Research Program.