Asphalt Emulsion Mixutre Design Considerations for Cold-in-place Recycling Projects PDF Download

Author: Mark Richard Lahr
Publisher:
ISBN:
Category :
Languages : en
Pages : 226

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Author: Jon A. Epps
Publisher: Transportation Research Board
ISBN: 9780309049115
Category : Technology & Engineering
Languages : en
Pages : 116

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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.

Author:
Publisher:
ISBN:
Category : Pavements
Languages : en
Pages : 54

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The responsibility of Task Force No. 38 was defined to be as follows: The Task Force would address the cold processing of reclaimed asphalt pavement (RAP) with or without additional additives and/or aggregates to create a rehabilitated component of the pavement structure. This report contains information on the cold recycling process, project selection and assessment, cold recycled mixture and pavement structural design, quality control and testing, guidelines for construction specifications and definitions of terms.

Author: Todd V. Scholz
Publisher:
ISBN:
Category : Pavements, Asphalt
Languages : en
Pages : 58

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Author: Kamran Majidzadeh
Publisher:
ISBN:
Category : Low-volume roads
Languages : en
Pages : 126

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This report presents a study initiated in 1984 to develop specification guidelines and mix design recommendations and to obtain performance data on cold-mix recycling projects in Ohio. Future investment planning was the motivation for the Ohio Department of Transportation to consider cold-mix recycling of local roads as a maintenance alternative. Two mainline, low volume roads and one shoulder pavement were selected for this study. Documentation and evaluation of the projects are discussed generally in two parts. The first part includes the site selection criteria, pre-construction evaluation, mix designs, construction specifications and construction monitoring. The second part discusses performance evaluation through field inspection, data collection and laboratory evaluation of material properties.

Author:
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ISBN:
Category :
Languages : en
Pages :

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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.

Author: Steve Beckett
Publisher:
ISBN:
Category : Pavements, Asphalt
Languages : en
Pages : 56

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Author: Erica Ann Yeung
Publisher:
ISBN:
Category : Asphalt emulsion mixtures
Languages : en
Pages : 122

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Cold in-place recycling (CIR) is a process that takes three to four inches of existing pavement surface and reuses 100% of it by milling and crushing it, adding asphalt emulsions and/or additives to it, before placing and re-compacting it. There is currently very little research regarding the interaction between the crushed aggregate and asphalt emulsion during the CIR process. In this study, the interactions between the combinations of crushed aggregates and asphalt emulsions were investigated along with select compaction metrics and a raveling performance test. The three types of aggregates included coated limestone, recycled asphalt pavement (RAP), and coated syenite. The two types of emulsifiers included a commodity and a proprietary one. The compaction metrics explored the compaction behavior of CIR and the raveling test is a standard test that evaluates a mixture's resistance to raveling under initial traffic. The results of this project indicated crushing aggregate and waiting between one hour to one day before mixing can be more optimal for easier compactibility than crushing and mixing immediately or waiting one week later. Not only were the results seen in the compaction metrics, but in the raveling test as well.

Author: Nicholas James Cerullo
Publisher:
ISBN:
Category : Asphalt
Languages : en
Pages : 354

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Author: Asphalt Institute
Publisher:
ISBN: 9781934154090
Category : Aggregates (Building materials)
Languages : en
Pages : 185

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