Feasibility Of Reclaimed Asphalt Pavement As Aggregate In Portland Cement Concrete
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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 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.
Feasibility Of Reclaimed Asphalt Pavement As Aggregate In Portland Cement Concrete Pavement
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Author : Bethany Noel Bermel
language : en
Publisher:
Release Date : 2011
Feasibility Of Reclaimed Asphalt Pavement As Aggregate In Portland Cement Concrete Pavement written by Bethany Noel Bermel and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with Pavements categories.
Each year, the US highway industry produces over 100 million tons of reclaimed asphalt pavement (RAP) through the rehabilitation and construction of the nation's roads. Using RAP as aggregate in Portland cement concrete pavement (PCCP) is one attractive application for a further use of this recyclable material. Earlier research has demonstrated the feasibility of creating concrete with RAP aggregate; however, prior studies focus on mechanical properties of the material. This research project will further distinguish the properties of this material and draw conclusions on the concrete's aptness for use as a pavement in Montana. This thesis encompasses the development of candidate RAP in PCCP mixtures that will subsequently move forward for a more thorough evaluation of their material properties. The mixing experiment and preliminary testing phases of this project provided information to draw a number of conclusions about the appropriateness of RAP aggregate in PCCP, including: (1) using conventional practices, PCCP containing RAP aggregate (20 percent fine and 45 percent coarse) can achieve compressive strengths in excess of 3,000-psi; (2) as the RAP replacement rate is increased, the compressive strength of the concrete decreases; (3) fine RAP aggregate appears to have a more detrimental effect on the concrete than coarse aggregate; (4) concretes with a relatively high RAP replacement rate (50 percent fine and 100 percent coarse) may be suitable for transportation applications; (5) at high RAP replacement rates, there appears to be a benefit (relative to concrete strength) in using increased replacements of both fine and coarse RAP, rather than singly replacing just one aggregate gradation; and (6) concrete containing RAP displays increased flexural strengths as compared to traditional PCCP. This material research was performed using a Design of Experiments (DOE) method. The suitability of this statistical method as a mix design development tool was characterized through several important findings, which include: (1) the DOE method was effective in distinguishing mixture behaviors; (2) mix design optimization is readily accomplished using the statistical model generated from the DOE data; and (3) variability in the concrete mixing and testing processes has a significant effect on the capabilities of the statistical model.
Evaluation Of Cement And Fly Ash Treated Recycled Asphalt Pavement And Aggregates For Base Construction
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Author : Tyson David Rupnow
language : en
Publisher:
Release Date : 2011
Evaluation Of Cement And Fly Ash Treated Recycled Asphalt Pavement And Aggregates For Base Construction written by Tyson David Rupnow and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with Cement categories.
INTRODUCTION: Many entities currently use recycled asphalt pavement (RAP) and other aggregates as base materials, temporary haul roads, and, in the case of RAP, hot mix asphalt construction. Several states currently allow the use of RAP combined with cement for a stabilized base course under both asphalt and concrete pavements. Currently, there is disagreement on what properties are required and how to test the cement and fly ash treated RAP for both asphalt and concrete pavement structures. This project investigated cement and fly ash treated RAP and other materials to determine their suitability for base course construction. OBJECTIVE: The objective of this research was to determine feasibility of cement and fly ash treated RAP and other aggregates as a structural layer for both portland cement concrete and hot mix asphalt pavement systems.
Evaluation Of Cement And Fly Ash Treated Recycled Asphalt Pavement And Aggregates For Base Construction
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Author : Tyson David Rupnow
language : en
Publisher:
Release Date : 2011
Evaluation Of Cement And Fly Ash Treated Recycled Asphalt Pavement And Aggregates For Base Construction written by Tyson David Rupnow and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with Cement categories.
The objective of this study was to determine feasibility of cement and fly ash treated recycled asphalt pavement (RAP) and other aggregates as a structural layer for both portland cement concrete and hot mix asphalt pavement systems. A 610 limestone from Kentucky was used as the reference material. Other materials used in the study include: Mexican 610 limestone, gravel and limestone based RAP, and blended calcium sulfate (BCS). Samples were prepared with three cement and fly ash contents and tested for compression and flexural strength. Length changes specimens were also produced and the resilient modulus was measured.
Engineering Challenges For Sustainable Future
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Author : Noor Amila Wan Abdullah Zawawi
language : en
Publisher: CRC Press
Release Date : 2016-12-01
Engineering Challenges For Sustainable Future written by Noor Amila Wan Abdullah Zawawi and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016-12-01 with Science categories.
Engineering Challenges for Sustainable Future contains the papers presented at the 3rd International Conference on Civil, Offshore & Environmental Engineering (ICCOEE2016, Kuala Lumpur, Malaysia, 15-17 August 2016), under the banner of World Engineering, Science & Technology Congress (ESTCON2016). The ICCOEE series of conferences started in Kuala Lumpur, Malaysia 2012, and the second event of the series took place in Kuala Lumpur, Malaysia 2014. This conference series deals with the civil, offshore & environmental engineering field, addressing the following topics: • Environmental and Water Resources Engineering • Coastal and Offshore Engineering • Structures and Materials • Construction and Project Management • Highway, Geotechnical and Transportation Engineering and Geo-informatics This book is an essential reading for academic, engineers and all professionals involved in the area of civil, offshore and environmental engineering.
Mechanical Properties Of High Strength Portland Cement Concrete With Recycled Asphalt Pavement As A Percent Replacement Of Coarse Aggregate
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Author : Andrew Joseph Fellows
language : en
Publisher:
Release Date : 2014
Mechanical Properties Of High Strength Portland Cement Concrete With Recycled Asphalt Pavement As A Percent Replacement Of Coarse Aggregate written by Andrew Joseph Fellows 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.
Recycled Asphalt Pavement As Coarse Aggregate Replacement In High Strength Portland Cement Concrete Mixes
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Author : Tara R. Capson
language : en
Publisher:
Release Date : 2014
Recycled Asphalt Pavement As Coarse Aggregate Replacement In High Strength Portland Cement Concrete Mixes written by Tara R. Capson 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.
Proceedings Of Italian Concrete Conference 2022
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Author : Maria Antonietta Aiello
language : en
Publisher: Springer Nature
Release Date : 2023-09-14
Proceedings Of Italian Concrete Conference 2022 written by Maria Antonietta Aiello and has been published by Springer Nature this book supported file pdf, txt, epub, kindle and other format this book has been release on 2023-09-14 with Technology & Engineering categories.
This book gathers the best peer-reviewed papers presented at the Italian Concrete Conference, held in Naples, Italy, on October 12-15, 2022. The conference topics encompass the aspects of design, execution, rehabilitation, and control of concrete structures, with particular reference to theory and modeling, applications and realizations, materials and investigations, technology, and construction techniques. The contributions amply demonstrate that today’s structural concrete applications concern not only new constructions, but more and more rehabilitation, conservation, strengthening, and seismic upgrading of existing premises, and that requirements cover new aspects within the frame of sustainability, including environmental friendliness, durability, adaptability, and reuse of works and/or materials. As such, the book represents an invaluable, up-to-the-minute tool, providing an essential overview of structural concrete, as well as all new materials with cementitious matrices.
Sustainable Concrete Materials And Structures
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Author : Ashraf Ashour
language : en
Publisher: Elsevier
Release Date : 2024-06-03
Sustainable Concrete Materials And Structures written by Ashraf Ashour and has been published by Elsevier this book supported file pdf, txt, epub, kindle and other format this book has been release on 2024-06-03 with Technology & Engineering categories.
Sustainable Concrete Materials and Structures focuses on recent research progress and innovations in this important field of research. All aspects of the technical routes to sustainable concrete and structures are discussed in detail. These include recent findings on sustainable concrete production and structural design and construction. Low-carbon cement, sustainable concrete mix design, durability, and structural applications are discussed in detail. Emphasis is placed on how to bring some of the innovations in concrete technology closer to market. Information on techno-economic analysis, economy of scale, and the supply chain of sustainable concrete is also addressed. The book will be an essential reference resource for academic and industrial researchers working in civil engineering, material science, chemical engineering, and the development and manufacture of construction materials. Provides a comprehensive collection of technical reviews on the latest advancements in sustainable concrete materials and structures Presents state-of-the-art research on preparation, production, processing, and implementation techniques for sustainable concrete materials and structures Features techno-economic analysis for each technology discussed Covers lifecycle assessment, the Circular Economy and end of life of concrete structures Includes industry case studies on implementation