Author: Yongjoo Kim
Publisher:
ISBN: 9780549057796
Category : Pavements, Asphalt
Languages : en
Pages : 492
Book Description
A desire to maintain a safe, efficient, and cost-effective roadway system has led to a significant increase in the demand to rehabilitate the existing pavements. Asphalt pavement recycling has grown dramatically over the last few years as the preferred way to rehabilitate existing asphalt pavements. A number of different techniques has been employed in the rehabilitation of existing asphalt pavements. One of these is Cold Inplace Recycling with foamed asphalt (CIR-foam). However, the current CIR-foam practice utilizes a generic recipe specification without a mix design, where a contractor is given latitude to adjust the proportions of the foamed asphalt content to achieve a specified level of density. Therefore, this study was conducted to develop a consistent laboratory mix design in consideration of its predicted field performance. First, the CIR-foam mix design parameters were identified and a new laboratory mix design procedure of CIR-foam mixture was developed. The developed mix design procedure was then validated using different sources of RAP materials. The simple performance tests, which include a dynamic modulus test, a dynamic creep test and a raveling test, were used to evaluate the consistency of a new CIR-foam mix design process to ensure reliable mixture performance over a wide range of traffic and climatic conditions.
Development of New Mix Design for Cold In-place Recycling Using Foamed Asphalt
Author: Yongjoo Kim
Publisher:
ISBN: 9780549057796
Category : Pavements, Asphalt
Languages : en
Pages : 492
Book Description
A desire to maintain a safe, efficient, and cost-effective roadway system has led to a significant increase in the demand to rehabilitate the existing pavements. Asphalt pavement recycling has grown dramatically over the last few years as the preferred way to rehabilitate existing asphalt pavements. A number of different techniques has been employed in the rehabilitation of existing asphalt pavements. One of these is Cold Inplace Recycling with foamed asphalt (CIR-foam). However, the current CIR-foam practice utilizes a generic recipe specification without a mix design, where a contractor is given latitude to adjust the proportions of the foamed asphalt content to achieve a specified level of density. Therefore, this study was conducted to develop a consistent laboratory mix design in consideration of its predicted field performance. First, the CIR-foam mix design parameters were identified and a new laboratory mix design procedure of CIR-foam mixture was developed. The developed mix design procedure was then validated using different sources of RAP materials. The simple performance tests, which include a dynamic modulus test, a dynamic creep test and a raveling test, were used to evaluate the consistency of a new CIR-foam mix design process to ensure reliable mixture performance over a wide range of traffic and climatic conditions.
Publisher:
ISBN: 9780549057796
Category : Pavements, Asphalt
Languages : en
Pages : 492
Book Description
A desire to maintain a safe, efficient, and cost-effective roadway system has led to a significant increase in the demand to rehabilitate the existing pavements. Asphalt pavement recycling has grown dramatically over the last few years as the preferred way to rehabilitate existing asphalt pavements. A number of different techniques has been employed in the rehabilitation of existing asphalt pavements. One of these is Cold Inplace Recycling with foamed asphalt (CIR-foam). However, the current CIR-foam practice utilizes a generic recipe specification without a mix design, where a contractor is given latitude to adjust the proportions of the foamed asphalt content to achieve a specified level of density. Therefore, this study was conducted to develop a consistent laboratory mix design in consideration of its predicted field performance. First, the CIR-foam mix design parameters were identified and a new laboratory mix design procedure of CIR-foam mixture was developed. The developed mix design procedure was then validated using different sources of RAP materials. The simple performance tests, which include a dynamic modulus test, a dynamic creep test and a raveling test, were used to evaluate the consistency of a new CIR-foam mix design process to ensure reliable mixture performance over a wide range of traffic and climatic conditions.
Validation of the Mix Design Process for Cold In-place Rehabilitation Using Foamed Asphalt
Author: Hosin David Lee
Publisher:
ISBN:
Category : Foamed materials
Languages : en
Pages : 250
Book Description
Asphalt pavement recycling has grown dramatically over the last few years as a viable technology to rehabilitate existing asphalt pavements. Iowa's current Cold In-place Recycling (CIR) practice utilizes a generic recipe specification to define the characteristic of the CIR mixture. As CIR continues to evolve, the desire to place CIR mixture with specific engineering properties requires the use of a mix design process. A new mix design procedure was developed for Cold In-place Recycling using foamed asphalt (CIR-foam) in consideration of its predicted field performance. The new laboratory mix design process was validated against various Reclaimed Asphalt Pavement (RAP) materials to determine its consistency over a wide range of RAP materials available throughout Iowa. The performance tests, which include dynamic modulus test, dynamic creep test and raveling test, were conducted to evaluate the consistency of a new CIR-foam mix design process to ensure reliable mixture performance over a wide range of traffic and climate conditions. The "lab designed" CIR will allow the pavement designer to take the properties of the CIR into account when determining the overlay thickness.
Publisher:
ISBN:
Category : Foamed materials
Languages : en
Pages : 250
Book Description
Asphalt pavement recycling has grown dramatically over the last few years as a viable technology to rehabilitate existing asphalt pavements. Iowa's current Cold In-place Recycling (CIR) practice utilizes a generic recipe specification to define the characteristic of the CIR mixture. As CIR continues to evolve, the desire to place CIR mixture with specific engineering properties requires the use of a mix design process. A new mix design procedure was developed for Cold In-place Recycling using foamed asphalt (CIR-foam) in consideration of its predicted field performance. The new laboratory mix design process was validated against various Reclaimed Asphalt Pavement (RAP) materials to determine its consistency over a wide range of RAP materials available throughout Iowa. The performance tests, which include dynamic modulus test, dynamic creep test and raveling test, were conducted to evaluate the consistency of a new CIR-foam mix design process to ensure reliable mixture performance over a wide range of traffic and climate conditions. The "lab designed" CIR will allow the pavement designer to take the properties of the CIR into account when determining the overlay thickness.
Development of a Mix Design Process for Cold-in-place Rehabilitation Using Foamed Asphalt
Author: Hosin David Lee
Publisher:
ISBN:
Category : Foamed materials
Languages : en
Pages : 116
Book Description
This study evaluates one of the recycling techniques used to rehabilitate pavement, called Cold In-Place Recycling (CIR). CIR is one of the fastest growing road rehabilitation techniques because it is quick and cost-effective. The document reports on the current practice of CIR with emulsion, presents a literature review of research on foamed asphalt, discusses the foaming experiment, presents a field data collection and compaction study, and describes the determination of mix design parameters for CIR with foamed asphalt.
Publisher:
ISBN:
Category : Foamed materials
Languages : en
Pages : 116
Book Description
This study evaluates one of the recycling techniques used to rehabilitate pavement, called Cold In-Place Recycling (CIR). CIR is one of the fastest growing road rehabilitation techniques because it is quick and cost-effective. The document reports on the current practice of CIR with emulsion, presents a literature review of research on foamed asphalt, discusses the foaming experiment, presents a field data collection and compaction study, and describes the determination of mix design parameters for CIR with foamed asphalt.
Manual of Laboratory Mix Design Procedure for Cold In-Place Recycling Using Foamed Asphalt (CIR-foam)
Author: Hosin "David" Lee
Publisher:
ISBN:
Category : Pavements, Asphalt
Languages : en
Pages : 0
Book Description
The objective is to determine the optimum percentage of water needed to produce the best foam properties for a given asphalt binder. The optimum water content is determined by achieving the maximum expansion ratio and half-life of the foamed asphalt. Expansion ratio is defined as the maximum volume over its original volume and half-life is defined as the time in seconds for foam to become a half of its maximum volume.
Publisher:
ISBN:
Category : Pavements, Asphalt
Languages : en
Pages : 0
Book Description
The objective is to determine the optimum percentage of water needed to produce the best foam properties for a given asphalt binder. The optimum water content is determined by achieving the maximum expansion ratio and half-life of the foamed asphalt. Expansion ratio is defined as the maximum volume over its original volume and half-life is defined as the time in seconds for foam to become a half of its maximum volume.
Cold-recycled Bituminous Concrete Using Bituminous Materials
Author: Jon A. Epps
Publisher: Transportation Research Board
ISBN: 9780309049115
Category : Technology & Engineering
Languages : en
Pages : 116
Book Description
This synthesis will be of interest to pavement designers, construction engineers, and others interested in economical methods for reconstructing or rehabilitating bituminous pavements. Information is provided on the processes and procedures used by a number of states to recycle asphalt pavements in place without application of heat. Since 1975 a growing number of state highway agencies have reconstructed or rehabilitated asphalt pavements by recycling the old pavement in place. This report of the Transportation Research Board describes the processes used for cold in-place recycling, including construction procedures, mix designs, mixture properties, performance, and specifications.
Publisher: Transportation Research Board
ISBN: 9780309049115
Category : Technology & Engineering
Languages : en
Pages : 116
Book Description
This synthesis will be of interest to pavement designers, construction engineers, and others interested in economical methods for reconstructing or rehabilitating bituminous pavements. Information is provided on the processes and procedures used by a number of states to recycle asphalt pavements in place without application of heat. Since 1975 a growing number of state highway agencies have reconstructed or rehabilitated asphalt pavements by recycling the old pavement in place. This report of the Transportation Research Board describes the processes used for cold in-place recycling, including construction procedures, mix designs, mixture properties, performance, and specifications.
Wirtgen Cold Recycling Manual
Author: Wirtgen GmbH.
Publisher:
ISBN: 9783936215052
Category : Pavements
Languages : en
Pages : 248
Book Description
Publisher:
ISBN: 9783936215052
Category : Pavements
Languages : en
Pages : 248
Book Description
Quantifying Workability, Compactability, and Cohesion Gain of Asphalt Emulsion Cold In-place Recycling
Author: Sadie Casillas
Publisher:
ISBN:
Category :
Languages : en
Pages : 388
Book Description
To maximize the life and quality of a pavement, proper maintenance and rehabilitation are essential. Strategies for pavement rehabilitation with many sustainable benefits are pavement recycling. This dissertation focuses on two types of in-situ pavement recycling: Cold in-place recycling (CIR) stabilized with asphalt emulsion and full depth reclamation (FDR) stabilized with asphalt emulsion or foamed asphalt. One white paper (Chapter 2), two accepted peer reviewed journal articles (Chapters 3 and 4), and one submitted peer reviewed journal article (Chapter 5) are presented in this document to create better understanding of the unique material characterization of asphalt emulsion cold recycled materials, along with factors which influence characterization, pertaining to the measurement of workability, compactability, and cohesion gain. In Chapter 2, a detailed review of the progression of mix design procedures for unbound granular materials (UGM), fully bound hot mix asphalt (HMA), and semi-bound asphalt emulsion CIR is presented to establish the current state of mix design for each material type and identify ways the design of asphalt emulsion CIR could become more engineered rather than empirical. Recommendations included development of additional guidance on use of active and inert fillers, a methodology to account for workability and compactability during mix design, curing procedures which more closely mimic conditions in the field to improve cohesion gain, and a procedure for determination of optimum water content. In Chapter 3, a study was conducted to evaluate different laboratory compaction methods for compaction of asphalt emulsion and foamed asphalt FDR. Both the Proctor hammer, typically used for UGM, and the Superpave Gyratory Compactor (SGC), typically used for HMA, were compared by evaluating densities, tensile strengths, and compaction metrics of FDR samples produced using each method. The modified Proctor hammer produced samples with the highest dry unit weights; however, samples produced using the SGC had higher tensile strengths, indicating compaction method affects material properties. Chapter 4 evaluates different test methods and equipment commonly available in asphalt laboratories for ability to quantify workability, compactability, and cohesion gain of asphalt emulsion CIR by measuring differences in performance due to changes in laboratory curing conditions. Cure temperature was found to have a more significant influence on test results than cure time. SGC metrics were recommended for quantifying workability and compactability. The direct shear test showed promise for quantifying cohesion gain. Finally, Chapter 5 measured effects of various sample fabrication factors on measurement of workability, compactability, and cohesion gain in order to address open questions associated with asphalt emulsion CIR laboratory procedures. Curing temperature most significantly influenced workability and compactability; while cohesion gain was more significantly influenced by mixing temperature and specimen test temperature. The direct shear test again showed promise for measuring cohesion gain of asphalt emulsion CIR. Therefore, a draft specification for this test method was prepared and is included as an appendix of this dissertation. A singular test method for quantifying workability and compactability for asphalt emulsion CIR has not yet been identified due to multiple mechanisms at play during mixing and compaction stages for this material.
Publisher:
ISBN:
Category :
Languages : en
Pages : 388
Book Description
To maximize the life and quality of a pavement, proper maintenance and rehabilitation are essential. Strategies for pavement rehabilitation with many sustainable benefits are pavement recycling. This dissertation focuses on two types of in-situ pavement recycling: Cold in-place recycling (CIR) stabilized with asphalt emulsion and full depth reclamation (FDR) stabilized with asphalt emulsion or foamed asphalt. One white paper (Chapter 2), two accepted peer reviewed journal articles (Chapters 3 and 4), and one submitted peer reviewed journal article (Chapter 5) are presented in this document to create better understanding of the unique material characterization of asphalt emulsion cold recycled materials, along with factors which influence characterization, pertaining to the measurement of workability, compactability, and cohesion gain. In Chapter 2, a detailed review of the progression of mix design procedures for unbound granular materials (UGM), fully bound hot mix asphalt (HMA), and semi-bound asphalt emulsion CIR is presented to establish the current state of mix design for each material type and identify ways the design of asphalt emulsion CIR could become more engineered rather than empirical. Recommendations included development of additional guidance on use of active and inert fillers, a methodology to account for workability and compactability during mix design, curing procedures which more closely mimic conditions in the field to improve cohesion gain, and a procedure for determination of optimum water content. In Chapter 3, a study was conducted to evaluate different laboratory compaction methods for compaction of asphalt emulsion and foamed asphalt FDR. Both the Proctor hammer, typically used for UGM, and the Superpave Gyratory Compactor (SGC), typically used for HMA, were compared by evaluating densities, tensile strengths, and compaction metrics of FDR samples produced using each method. The modified Proctor hammer produced samples with the highest dry unit weights; however, samples produced using the SGC had higher tensile strengths, indicating compaction method affects material properties. Chapter 4 evaluates different test methods and equipment commonly available in asphalt laboratories for ability to quantify workability, compactability, and cohesion gain of asphalt emulsion CIR by measuring differences in performance due to changes in laboratory curing conditions. Cure temperature was found to have a more significant influence on test results than cure time. SGC metrics were recommended for quantifying workability and compactability. The direct shear test showed promise for quantifying cohesion gain. Finally, Chapter 5 measured effects of various sample fabrication factors on measurement of workability, compactability, and cohesion gain in order to address open questions associated with asphalt emulsion CIR laboratory procedures. Curing temperature most significantly influenced workability and compactability; while cohesion gain was more significantly influenced by mixing temperature and specimen test temperature. The direct shear test again showed promise for measuring cohesion gain of asphalt emulsion CIR. Therefore, a draft specification for this test method was prepared and is included as an appendix of this dissertation. A singular test method for quantifying workability and compactability for asphalt emulsion CIR has not yet been identified due to multiple mechanisms at play during mixing and compaction stages for this material.
Selection of Asphalt Recycling Methods and Recycled Asphalt Mixture Properties
Author: Nicholas James Cerullo
Publisher:
ISBN:
Category : Asphalt
Languages : en
Pages : 354
Book Description
Publisher:
ISBN:
Category : Asphalt
Languages : en
Pages : 354
Book Description
Use of Foamed Asphalt in Cold, Recycled Mixtures
Author: Maghsoud Tahmoressi
Publisher:
ISBN:
Category : Asphalt
Languages : en
Pages : 72
Book Description
Publisher:
ISBN:
Category : Asphalt
Languages : en
Pages : 72
Book Description
Modified Cold In-place Asphalt Recycling
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Cold in-place asphalt recycling has been shown to be a technically sound, cost-effective, environmentally friendly method of strengthening and maintaining a wide range of deteriorating asphalt pavements. The overall process combines testing and mix design procedures, milling, processing and mixing units with microprocessor control of emulsion addition, compaction, placement of a wearing surface and quality assurance testing. It has been shown, in laboratory work and a number of Ontario projects the past four years, that modification of the cold in-place process to incorporate new aggregate results in an improved recycled binder course with closer voids and stability control, addressing observed conventional cold in-place asphalt recycling problems such as: high residual asphalt cement content (flushing); tine mix (high percent passing 4.75 mm and 75 pm); rutting (low initial stability with emulsion system); and adequacy of in-place material thickness. Structural equivalency factors for cold in-place recycled asphalt compared to conventional binder course hot-mix asphalt have been developed. Resilient properties of laboratory and field samples have been determined with the Nottingham Asphalt Tester (NAT) and used in standard mechanistic design programs such as BISAR. Future applications of modified cold in-place asphalt recycling to improve flexible pavements will undoubtedly include airports, which will require consideration of special features such as operational constraints. For the covering abstract of this conference see IRRD number 872978.
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Cold in-place asphalt recycling has been shown to be a technically sound, cost-effective, environmentally friendly method of strengthening and maintaining a wide range of deteriorating asphalt pavements. The overall process combines testing and mix design procedures, milling, processing and mixing units with microprocessor control of emulsion addition, compaction, placement of a wearing surface and quality assurance testing. It has been shown, in laboratory work and a number of Ontario projects the past four years, that modification of the cold in-place process to incorporate new aggregate results in an improved recycled binder course with closer voids and stability control, addressing observed conventional cold in-place asphalt recycling problems such as: high residual asphalt cement content (flushing); tine mix (high percent passing 4.75 mm and 75 pm); rutting (low initial stability with emulsion system); and adequacy of in-place material thickness. Structural equivalency factors for cold in-place recycled asphalt compared to conventional binder course hot-mix asphalt have been developed. Resilient properties of laboratory and field samples have been determined with the Nottingham Asphalt Tester (NAT) and used in standard mechanistic design programs such as BISAR. Future applications of modified cold in-place asphalt recycling to improve flexible pavements will undoubtedly include airports, which will require consideration of special features such as operational constraints. For the covering abstract of this conference see IRRD number 872978.