Author: David E. Newcomb
Publisher:
ISBN: 9780309480734
Category : Asphalt
Languages : en
Pages : 36
Book Description
Laboratory conditioning of asphalt mixtures during the mix design process to simulate their short-term aging influences the selection of the optimum asphalt content. In addition, long-term conditioning affects the mixture and binder stiffness, deformation, and strength evaluated with fundamental characterization tests to assess mixture performance. The current standard conditioning procedure, AASHTO R 30, Standard Practice for Mixture Conditioning of Hot-Mix Asphalt, was developed over two decades ago. In reviewing whether to update the standard, TRB's National Cooperative Highway Research Program (NCHRP) Research Report 919: Field Verification of Proposed Changes to the AASHTO R 30 Procedures for Laboratory Conditioning of Asphalt Mixtures seeks to (a) develop a laboratory short-term aging protocol to simulate the aging and asphalt absorption of an asphalt mixture during production and transportation based on factors thought to affect aging, and (b) develop a laboratory longer-term aging protocol to simulate the aging of the asphalt mixtures after construction. The key outcome of the research is that the current long-term oven aging (LTOA) procedure in AASHTO R 30 is not realistic. Replacing the aging of a compacted specimen with aging of loose mix for 5 days at 85°C (185°F) before compaction for testing should be considered by the AASHTO Committee on Materials and Pavements.
Field Verification of Proposed Changes to the AASHTO R 30 Procedures for Laboratory Conditioning of Asphalt Mixtures
Author: David E. Newcomb
Publisher:
ISBN: 9780309480734
Category : Asphalt
Languages : en
Pages : 36
Book Description
Laboratory conditioning of asphalt mixtures during the mix design process to simulate their short-term aging influences the selection of the optimum asphalt content. In addition, long-term conditioning affects the mixture and binder stiffness, deformation, and strength evaluated with fundamental characterization tests to assess mixture performance. The current standard conditioning procedure, AASHTO R 30, Standard Practice for Mixture Conditioning of Hot-Mix Asphalt, was developed over two decades ago. In reviewing whether to update the standard, TRB's National Cooperative Highway Research Program (NCHRP) Research Report 919: Field Verification of Proposed Changes to the AASHTO R 30 Procedures for Laboratory Conditioning of Asphalt Mixtures seeks to (a) develop a laboratory short-term aging protocol to simulate the aging and asphalt absorption of an asphalt mixture during production and transportation based on factors thought to affect aging, and (b) develop a laboratory longer-term aging protocol to simulate the aging of the asphalt mixtures after construction. The key outcome of the research is that the current long-term oven aging (LTOA) procedure in AASHTO R 30 is not realistic. Replacing the aging of a compacted specimen with aging of loose mix for 5 days at 85°C (185°F) before compaction for testing should be considered by the AASHTO Committee on Materials and Pavements.
Publisher:
ISBN: 9780309480734
Category : Asphalt
Languages : en
Pages : 36
Book Description
Laboratory conditioning of asphalt mixtures during the mix design process to simulate their short-term aging influences the selection of the optimum asphalt content. In addition, long-term conditioning affects the mixture and binder stiffness, deformation, and strength evaluated with fundamental characterization tests to assess mixture performance. The current standard conditioning procedure, AASHTO R 30, Standard Practice for Mixture Conditioning of Hot-Mix Asphalt, was developed over two decades ago. In reviewing whether to update the standard, TRB's National Cooperative Highway Research Program (NCHRP) Research Report 919: Field Verification of Proposed Changes to the AASHTO R 30 Procedures for Laboratory Conditioning of Asphalt Mixtures seeks to (a) develop a laboratory short-term aging protocol to simulate the aging and asphalt absorption of an asphalt mixture during production and transportation based on factors thought to affect aging, and (b) develop a laboratory longer-term aging protocol to simulate the aging of the asphalt mixtures after construction. The key outcome of the research is that the current long-term oven aging (LTOA) procedure in AASHTO R 30 is not realistic. Replacing the aging of a compacted specimen with aging of loose mix for 5 days at 85°C (185°F) before compaction for testing should be considered by the AASHTO Committee on Materials and Pavements.
Short-term Laboratory Conditioning of Asphalt Mixtures
Author: David Newcomb
Publisher:
ISBN:
Category : Asphalt
Languages : en
Pages : 196
Book Description
This report develops procedures and associated criteria for laboratory conditioning of asphalt mixtures to simulate short-term aging. The report presents proposed changes to the American Association of State Highway and Transportation Officials (AASHTO) R 30, Mixture Conditioning of Hot-Mix Asphalt (HMA), and a proposed AASHTO practice for conducting plant aging studies. The report will be of immediate interest to materials engineers in state highway agencies and the construction industry with responsibility for design and production of hot and warm mix asphalt.
Publisher:
ISBN:
Category : Asphalt
Languages : en
Pages : 196
Book Description
This report develops procedures and associated criteria for laboratory conditioning of asphalt mixtures to simulate short-term aging. The report presents proposed changes to the American Association of State Highway and Transportation Officials (AASHTO) R 30, Mixture Conditioning of Hot-Mix Asphalt (HMA), and a proposed AASHTO practice for conducting plant aging studies. The report will be of immediate interest to materials engineers in state highway agencies and the construction industry with responsibility for design and production of hot and warm mix asphalt.
Short-term Laboratory Conditioning of Asphalt Mixtures
Author: David Newcomb
Publisher:
ISBN:
Category : Asphalt
Languages : en
Pages : 196
Book Description
This report develops procedures and associated criteria for laboratory conditioning of asphalt mixtures to simulate short-term aging. The report presents proposed changes to the American Association of State Highway and Transportation Officials (AASHTO) R 30, Mixture Conditioning of Hot-Mix Asphalt (HMA), and a proposed AASHTO practice for conducting plant aging studies. The report will be of immediate interest to materials engineers in state highway agencies and the construction industry with responsibility for design and production of hot and warm mix asphalt.
Publisher:
ISBN:
Category : Asphalt
Languages : en
Pages : 196
Book Description
This report develops procedures and associated criteria for laboratory conditioning of asphalt mixtures to simulate short-term aging. The report presents proposed changes to the American Association of State Highway and Transportation Officials (AASHTO) R 30, Mixture Conditioning of Hot-Mix Asphalt (HMA), and a proposed AASHTO practice for conducting plant aging studies. The report will be of immediate interest to materials engineers in state highway agencies and the construction industry with responsibility for design and production of hot and warm mix asphalt.
Evaluation of the Moisture Susceptibility of WMA Technologies
Author: Amy Epps Martin
Publisher:
ISBN: 9780309283687
Category : Technology & Engineering
Languages : en
Pages : 116
Book Description
"TRB's National Cooperative Highway Research Program (NCHRP) Report 763: Evaluation of the Moisture Susceptibility of WMA Technologies presents proposed guidelines for identifying potential moisture susceptibility in warm mix asphalt (WMA). The report also suggests potential revisions to the Appendix to AASHTO R 35, "Special Mixture Design Considerations and Methods for WMA" as a means to implement the guidelines."--publisher's description
Publisher:
ISBN: 9780309283687
Category : Technology & Engineering
Languages : en
Pages : 116
Book Description
"TRB's National Cooperative Highway Research Program (NCHRP) Report 763: Evaluation of the Moisture Susceptibility of WMA Technologies presents proposed guidelines for identifying potential moisture susceptibility in warm mix asphalt (WMA). The report also suggests potential revisions to the Appendix to AASHTO R 35, "Special Mixture Design Considerations and Methods for WMA" as a means to implement the guidelines."--publisher's description
Mix Design Practices for Warm Mix Asphalt
Author: Ramon Francis Bonaquist
Publisher: Transportation Research Board
ISBN: 0309155592
Category : Science
Languages : en
Pages : 111
Book Description
TRB's National Cooperative Highway Research Program (NCHRP) Report 691: Mix Design Practices for Warm-Mix Asphalt explores a mix design method tailored to the unique material properties of warm mix asphalt technologies. Warm mix asphalt (WMA) refers to asphalt concrete mixtures that are produced at temperatures approximately 50°F (28°C) or more cooler than typically used in the production of hot mix asphalt (HMA). The goal of WMA is to produce mixtures with similar strength, durability, and performance characteristics as HMA using substantially reduced production temperatures. There are important environmental and health benefits associated with reduced production temperatures including lower greenhouse gas emissions, lower fuel consumption, and reduced exposure of workers to asphalt fumes. Lower production temperatures can also potentially improve pavement performance by reducing binder aging, providing added time for mixture compaction, and allowing improved compaction during cold weather paving. Appendices to NCHRP Report 691 include the following. Appendices A, B, and D are included in the printed and PDF version of the report. Appendices C and E are available only online.
Publisher: Transportation Research Board
ISBN: 0309155592
Category : Science
Languages : en
Pages : 111
Book Description
TRB's National Cooperative Highway Research Program (NCHRP) Report 691: Mix Design Practices for Warm-Mix Asphalt explores a mix design method tailored to the unique material properties of warm mix asphalt technologies. Warm mix asphalt (WMA) refers to asphalt concrete mixtures that are produced at temperatures approximately 50°F (28°C) or more cooler than typically used in the production of hot mix asphalt (HMA). The goal of WMA is to produce mixtures with similar strength, durability, and performance characteristics as HMA using substantially reduced production temperatures. There are important environmental and health benefits associated with reduced production temperatures including lower greenhouse gas emissions, lower fuel consumption, and reduced exposure of workers to asphalt fumes. Lower production temperatures can also potentially improve pavement performance by reducing binder aging, providing added time for mixture compaction, and allowing improved compaction during cold weather paving. Appendices to NCHRP Report 691 include the following. Appendices A, B, and D are included in the printed and PDF version of the report. Appendices C and E are available only online.
Short-term Laboratory Conditioning of Asphalt Mixtures
Author: David Newcomb
Publisher:
ISBN: 9780309374897
Category : Asphalt
Languages : en
Pages : 196
Book Description
This report develops procedures and associated criteria for laboratory conditioning of asphalt mixtures to simulate short-term aging. The report presents proposed changes to the American Association of State Highway and Transportation Officials (AASHTO) R 30, Mixture Conditioning of Hot-Mix Asphalt (HMA), and a proposed AASHTO practice for conducting plant aging studies. The report will be of immediate interest to materials engineers in state highway agencies and the construction industry with responsibility for design and production of hot and warm mix asphalt.
Publisher:
ISBN: 9780309374897
Category : Asphalt
Languages : en
Pages : 196
Book Description
This report develops procedures and associated criteria for laboratory conditioning of asphalt mixtures to simulate short-term aging. The report presents proposed changes to the American Association of State Highway and Transportation Officials (AASHTO) R 30, Mixture Conditioning of Hot-Mix Asphalt (HMA), and a proposed AASHTO practice for conducting plant aging studies. The report will be of immediate interest to materials engineers in state highway agencies and the construction industry with responsibility for design and production of hot and warm mix asphalt.
Long-term Aging of Asphalt Mixtures for Performance Testing and Prediction
Author: Y. Richard Kim
Publisher:
ISBN: 9780309446839
Category : Pavements, Asphalt
Languages : en
Pages : 104
Book Description
Publisher:
ISBN: 9780309446839
Category : Pavements, Asphalt
Languages : en
Pages : 104
Book Description
Introduction to Unmanned Aircraft Systems, Second Edition
Author: Douglas M. Marshall
Publisher: CRC Press
ISBN: 113802693X
Category : Political Science
Languages : en
Pages : 1944
Book Description
The proliferation of technological capability, miniaturization, and demand for aerial intelligence is pushing unmanned aerial systems (UAS) into the realm of a multi-billion dollar industry. This book surveys the UAS landscape from history to future applications. It discusses commercial applications, integration into the national airspace system (NAS), System function, operational procedures, safety concerns, and a host of other relevant topics. The book is dynamic and well-illustrated with separate sections for terminology and web- based resources for further information.
Publisher: CRC Press
ISBN: 113802693X
Category : Political Science
Languages : en
Pages : 1944
Book Description
The proliferation of technological capability, miniaturization, and demand for aerial intelligence is pushing unmanned aerial systems (UAS) into the realm of a multi-billion dollar industry. This book surveys the UAS landscape from history to future applications. It discusses commercial applications, integration into the national airspace system (NAS), System function, operational procedures, safety concerns, and a host of other relevant topics. The book is dynamic and well-illustrated with separate sections for terminology and web- based resources for further information.
Evaluation of Flow Number (Fn) as a Discriminating HMA Mixture Property
Author: Ramon Francis Bonaquist
Publisher:
ISBN:
Category : Pavements, Asphalt
Languages : en
Pages : 112
Book Description
Publisher:
ISBN:
Category : Pavements, Asphalt
Languages : en
Pages : 112
Book Description
Superpave Mix Design
Author: Asphalt Institute
Publisher:
ISBN: 9781934154175
Category : Asphalt
Languages : en
Pages : 102
Book Description
Publisher:
ISBN: 9781934154175
Category : Asphalt
Languages : en
Pages : 102
Book Description