Feasibility Of Using 100 Recycled Asphalt Pavement Mixtures For Road Construction
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Feasibility Of Using 100 Recycled Asphalt Pavement Mixtures For Road Construction
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Author : Russell Edgar Carlson IV
language : en
Publisher:
Release Date : 2014
Feasibility Of Using 100 Recycled Asphalt Pavement Mixtures For Road Construction written by Russell Edgar Carlson IV and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with Pavements, Asphalt categories.
Recycled Asphalt Pavement (RAP) is the largest recycled good in the United States and 80 million tons are recycled yearly, saving taxpayers about $1.5 billion dollars. This paper explores the possibility of utilizing 100% RAP materials in asphalt pavement. Asphalt mixtures are produced at 135°C in a typical asphalt plant. However, at 135°C, not all binder from RAP materials may not become effective for coating aggregates. The main objective of the study is to determine the amount of effective binder available from RAP in the asphalt plant. The 100% RAP mixes have aged binder that can alter mix designs and interaction with virgin binder. In this study, to determine low temperature cracking resistance and fatigue performance, samples were prepared using a 100% RAP mix with no virgin binder and a 100% RAP mix with virgin asphalt binder to achieve the optimum binder content of the mix. Second, to determine the effectiveness of binder from RAP materials, compaction tests were performed by heating RAP materials at various temperatures. It was found that 100% RAP mixes cannot be feasible for field use if additional virgin binder is added to reach the optimum asphalt content. Based on limited test results, the low temperature grade was not within proper limits but the beam fatigue testing results were acceptable. Based on compaction test results, additional heating is needed to increase the effectiveness of asphalt binder from RAP materials.
100 Recycled Hot Mix Asphalt And The Use Of Rejuvenators
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Author : Martins Zaumanis
language : en
Publisher:
Release Date : 2014
100 Recycled Hot Mix Asphalt And The Use Of Rejuvenators written by Martins Zaumanis and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with categories.
Abstract: The desire to find more sustainable paving practices as well as the dramatically rising binder costs driven by the growing global demand for paved roads, has led to increased interest of the use of reclaimed asphalt pavement (RAP) in very high amounts. So far the major industry trend has been to develop procedures, invest in technologies and build confidence in mixtures with up to 40 % RAP content. However, a few innovators have refined 100 % recycling technologies over the past four decades to a level where routine production of 100 % recycled hot mix asphalt is in clear sight. Rejuvenators are an integral part of 100 % recycled asphalt production and they can also allow to significantly increase the RAP content for conventionally produced asphalt mixtures. An evaluation of the feasibility of production of 100 % recycled hot-mix asphalt was made and the use of rejuvenators is presented in this study. 100 % recycling is discussed by evaluating ten readily available production technologies along with proposing mix design procedures and identifying best RAP management strategies. A total of eleven different products were evaluated for restoring the RAP binder grade with a definite conclusion that achieving target grade (PG or empirical specification) is possible. In addition a rheological, micromechanical and chemical characterization was performed with select rejuvenators and binders from Strategic Highway Research Program (SHRP) library. To further assess the rejuvenators and feasibility of 100 % RAP recycling a series of 100 % mixture tests were performed that indicated significant improvement in low temperature and fatigue cracking resistance while providing a rut resistant mixture. With the use of some rejuvenators a performance equal to that of reference virgin mix was achieved. Based on these findings of rejuvenator effectiveness a methodology for choice of rejuvenator type and dose was proposed. Finally, a cradle-to-gate analysis of environmental effects was performed which indicated 35 % CO2eq savings per ton of produced 100 % RAP asphalt mixture compared to virgin mix while cost analysis showed at least 50 % savings in material related expenses. A short video summarizing the research is available at http://youtu.be/y-rYvdGiEbY.
Feasibility Of Reclaimed Asphalt Pavement As Aggregate In Portland Cement Concrete Pavements
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Author :
language : en
Publisher:
Release Date : 2015
Feasibility Of Reclaimed Asphalt Pavement As Aggregate In Portland Cement Concrete Pavements written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with Pavements, Asphalt categories.
This research was focused on evaluating the feasibility of using minimally processed reclaimed asphalt pavement (RAP) as aggregate replacement in concrete pavements. An initial phase of research demonstrated that concretes with up to 50 percent of the fine aggregates and 100 percent of the coarse aggregates replaced with RAP were suitable for concrete pavement. However, the field performance of these mixes was not evaluated. Further, these initial mixes contained a significant proportion of cement in order to achieve the desired performance criteria, hindering the economic benefit of using this recycled material in concrete. Therefore, the research discussed herein focused on: (1) evaluating the field performance of RAP concrete through a field demonstration project, and (2) reducing the amount of cement required in the RAP concrete by including water-reducing admixtures. As part of the field demonstration project, two RAP-concrete slabs were cast on a roadway near Lewistown, MT, and monitored for damage, shrinkage, and curling over a two-year period. There were no logistical issues associated with the construction of the slabs, and no damage and only minor shrinkage/curling was observed. In regards to the mixture optimization, two modified mix designs with reduced cement contents were developed, and evaluated with a suite of mechanical and durability tests. Mechanical properties tested were compressive and tensile strength, elastic modulus, and shrinkage. Durability tests included abrasion, chloride permeability, freeze-thaw resistance, and scaling. These mixes performed well with respect to all tests, with the exception of the chloride permeability. Although both mixes performed well, the resulting mixes were lean and were difficult to get good consolidation. Moreover, the process for batching these mixes may be considered a hindrance, as it involved slump adjusting the mixes with the water-reducing admixture. This was required because the nature of the RAP aggregates made it difficult to adjust mixes for variations in moisture content.
Feasibility Of Recycling Rubber Modified Paving Materials
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Author :
language : en
Publisher:
Release Date : 2005
Feasibility Of Recycling Rubber Modified Paving Materials written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with Asphalt-rubber categories.
Feasibility Of Reclaimed Asphalt Pavement As Aggregate In Portland Cement Concrete
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Author : Michael Berry
language : en
Publisher:
Release Date : 2013
Feasibility Of Reclaimed Asphalt Pavement As Aggregate In Portland Cement Concrete written by Michael Berry and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with Aggregates (Building materials) categories.
This research effort was focused on evaluating the feasibility of using minimally processed reclaimed asphalt pavement (RAP) as aggregate replacement in concrete pavements. This research demonstrated that concretes with up to 50 percent of the fine aggregates and 100 percent of the coarse aggregates replaced with RAP were suitable for concrete pavement. A statistical experimental design procedure (response surface methodology - RSM) was used to investigate proportioning RAP concrete mixtures to achieve desired performance criteria. Based on the results of the RSM investigation, two concrete mixtures were selected for further evaluation: a high RAP mix with fine and coarse aggregate replacement rates of 50 and 100 percent respectively, and a "high" strength mix with one half of the RAP used in the high RAP mix. Both mixes met MDT concrete pavement specifications for slump (1.5 inches), air content (6 percent), and 28-day compressive and tensile strengths (3,000 psi and 500 psi, respectively). These two concrete mixtures were subjected to a suite of mechanical and durability tests to evaluate their potential use in Montana roadways. Mechanical properties tested were compressive and tensile strength, elastic modulus, shrinkage, and creep. Durability tests included alkali-silica reactivity, absorption, abrasion, chloride permeability, freeze-thaw resistance, and scaling. Overall, both mixes performed adequately in these mechanical and durability tests, although it is important to note that the inclusion of RAP had an obvious negative impact on nearly every property tested relative to those of control mixes made with 100 percent conventional aggregates.
Bituminous Mixtures And Pavements Vi
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Author : A. Nikolaides
language : en
Publisher: CRC Press
Release Date : 2015-07-28
Bituminous Mixtures And Pavements Vi written by A. Nikolaides and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015-07-28 with Technology & Engineering categories.
Bituminous Mixtures and Pavements contains 113 accepted papers from the 6th International ConferenceBituminous Mixtures and Pavements (6th ICONFBMP, Thessaloniki, Greece, 10-12 June 2015). The 6th ICONFBMP is organized every four years by the Highway Engineering Laboratory of the Aristotle University of Thessaloniki, Greece, in conjunction with
Development Of Asphalts And Pavements Using Recycled Tire Rubber Phase 1 Technical Feasibility Technical Progress Report September 1 1994 August 31 1995
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Author :
language : en
Publisher:
Release Date : 1996
Development Of Asphalts And Pavements Using Recycled Tire Rubber Phase 1 Technical Feasibility Technical Progress Report September 1 1994 August 31 1995 written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1996 with categories.
About 285 million tires are discarded every year; less than 100 million are currently being recycled, with the rest being placed in landfills and other waste sites. A solution to reduce the littering of the environment is to use ground tire rubber in road construction. Currently, about 27 million tons of asphalt are used each year in road construction and maintenance of the country's 2 million miles of roads. If all of the waste tire rubber could be combined with asphalt in road construction, it would displace less than 6% of the total asphalt used each year, yet could save about 60 trillion Btus annually. Purpose of this project is to provide data needed to optimize the performance of rubber-asphalt concretes. The first phase is to develop asphalts and recycling agents tailored for compatibility with ground tire rubber. Chapter 2 presents results on Laboratory Testing and Evaluation: fractionate asphalt material, reblending for aromatic asphalts, verifying optimal curing parameters, aging of blends, and measuring ductilities of asphalt-rubber binders. Chapter 3 focuses on Evaluating Mixture Characteristics (modified binders). Chapter 4 covers Adhesion Test Development (water susceptibility is also covered). The final chapter focuses on the Performance/Economic Update and Commercialization Plan.
Feasibility Of Using Recycled Glass In Asphalt
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Author : C. S. Hughes
language : en
Publisher:
Release Date : 1990
Feasibility Of Using Recycled Glass In Asphalt written by C. S. Hughes and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1990 with Glass waste categories.
This report was written in response to HJR 301, which "requests the VDOT to conduct a study of the feasibility of using recycled glass as supplemental aggregates in asphalt." The laboratory study did not indicate that there would be any adverse affects from the use of small percentages of glass (5 to 15 percent) under controlled gradation conditions. However, the use of recycled glass in both highway embankments an in unbound aggregate base materials would be preferable to its use in asphalt because of the propensity of the asphalt coating to be separated from the glass in the presence of moisture. The use of recycled glass in any highway construction will be strongly influenced by the cost of crushing and hauling it.
Transport Infrastructure And Systems
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Author : Gianluca Dell'Acqua
language : en
Publisher: CRC Press
Release Date : 2017-03-16
Transport Infrastructure And Systems written by Gianluca Dell'Acqua and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017-03-16 with Science categories.
Transport Infrastructure Asset management in transport infrastructure, financial viability of transport engineering projects/ Life cycle Cost Analysis, Life-Cycle Assessment and Sustainability Assessment of transport infrastructure/ Infrastructures financing and pricing with equity appraisal, operation optimization and energy management/ Low-Volume roads: planning, maintenance, operations, environmental and social issues/ Public-Private Partnership (PPP) experience in transport infrastructure in different countries and economic conditions/ Airport Pavement Management Systems, runway design and maintenance/ Port maintenance and development issues, technology relating to cargo handling, landside access, cruise operations/ Infrastructure Building Information Modelling (I-BIM) / Pavement design and innovative bituminous materials/ Recycling and re-use in road pavements, environmentally sustainable technologies/ Stone pavements, ancient roads and historic railways/ Cementitious stabilization of materials used in the rehabilitation of transportation infrastructure. Transport Systems Sustainable transport and the environment protection including green vehicles/ Urban transport, land use development, spatial and transport planning/ Bicycling, bike, bike-sharing systems, cycling mobility/ Human factor in transport systems/ Intelligent Mobility: emerging technologies to enable the smarter movement of people and goods/Airport landside: access roads, parking facilities, terminal facilities, aircraft apron and the azdjacent taxiway/ Transportation policy, planning and design, modelling and decision making/ Transport economics, finance and pricing issues, optimization problems, equity appraisal/ Road safety impact assessments, road safety audits, the management of road network safety and safety inspections/ Tunnels and underground structures: preventing incidents-accidents mitigating their effects for both people and goods/ Traffic flow characteristics, traffic control devices, work zone traffic control, highway capacity and quality of service/ Track-vehicle interactions in railway systems, capacity analysis of railway networks/ Risk assessment and safety in air and railway transport, reliability aspects/ Maritime transport and inland waterways transport research/ Intermodal freight transport: terminals and logistics.
A Study Of Recycling Feasibility
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Author :
language : en
Publisher:
Release Date : 1996
A Study Of Recycling Feasibility written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1996 with Pavements categories.
This report describes a feasibility study of recycling asphalt pavements using two major analytical techniques: High Performance Gel Permeation Chromatography (HP GPC) and Dynamic Mechanical Analysis (DMA). HP GPC probes the chemistry of the asphalt cement. DMA measures certain physical characteristics of the asphalt cement and of the mix. Four projects that had been recycled, three by hot methods, the other by a cold, in place process (CIPR), were studied. Specifically, the HP GPC characteristics of the asphalts before and after recycling and the resilient moduli of some recycled mixtures were obtained. In addition, three sources of recovered asphalt pavement were subjected to modeling of hot and cold recycling strategies and tested by DMA on mixes as well as by HP GPC. Finally, an additional five pavements that are candidates for recycling were sampled and the asphalt cements extracted for HP GPC and DMA testing using both hot and cold recycling simulations. This report details the study procedures and discusses the data and their interpretations. Included in this report are data on the HP GPC characteristics of the asphalt cements available in the state of Montana in 1993. Also, testing of asphalt cements from an experimental project and a distressed pavement is addressed briefly.