Effects Of Reclaimed Asphalt Pavement On Mechanical Properties Of Base Materials
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Effects Of Reclaimed Asphalt Pavement On Mechanical Properties Of Base Materials
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Author : Dane A. Cooley
language : en
Publisher:
Release Date : 2005
Effects Of Reclaimed Asphalt Pavement On Mechanical Properties Of Base Materials written by Dane A. Cooley and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with Electronic dissertations categories.
Reuse of reclaimed asphalt pavement (RAP) in the full-depth recycling (FDR) process is a cost-effective and environmentally responsible method of asphalt pavement reconstruction. Although FDR has been used for several years in some locations, the effect of RAP on the mechanical properties of recycled base materials has not been well documented. The purpose of this research was to investigate the influence of RAP on the mechanical properties of recycled base materials typical of northern Utah.
Effect Of High Percentages Of Reclaimed Asphalt Pavement On Mechanical Properties Of Cement Treated Base Material
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Author : Jacob C. Tolbert
language : en
Publisher:
Release Date : 2014
Effect Of High Percentages Of Reclaimed Asphalt Pavement On Mechanical Properties Of Cement Treated Base Material written by Jacob C. Tolbert and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with Electronic dissertations categories.
Given that the principle conclusion from this work is that CTB with high RAP contents can perform satisfactorily as a base material when a sufficient amount of cement is applied, agencies currently specifying limits on the percentage of RAP that can be used as a part of reclaimed base material in the FDR process should reevaluate their policies and specifications with the goal of allowing the use of high RAP contents where appropriate.
Evaluation Of The Effects Of Climatic Conditions On Modulus Of Base Materials With Recycled Asphalt Pavement
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Author : Haifang Wen
language : en
Publisher:
Release Date : 2011
Evaluation Of The Effects Of Climatic Conditions On Modulus Of Base Materials With Recycled Asphalt Pavement written by Haifang Wen and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with Asphalt concrete categories.
The use of recycled materials for construction is beneficial to both the environment and the economy. Recycled asphalt pavement (RAP) is one of the most commonly used recycled materials. Different state departments of transportation allow the use of RAP in base materials at different percentages. Characterization of the resilient modulus of base materials with RAP is important for proper pavement design. In addition, the models used in the Mechanistic-Empirical Pavement Design Guide (MEPDG) for traditional materials need to be verified for base materials with RAP, due to the unique properties of asphalt in RAP. This study evaluated the effects of moisture and temperature on the resilient modulus of base materials with different percentages of RAP. The models for the effects of moisture content on the resilient modulus of unbound materials were evaluated using crushed aggregates with RAP. In addition, models were proposed to account for the effects of temperature on the resilient modulus of base materials with RAP. The effects of the percentage of RAP on frozen moduli were also investigated.
Characterizing Cement Stabilized Base Material Containing Reclaimed Asphalt Pavement
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Author : Stephanus Johannes Hofmeyr Louw
language : en
Publisher:
Release Date : 2014
Characterizing Cement Stabilized Base Material Containing Reclaimed Asphalt Pavement written by Stephanus Johannes Hofmeyr Louw 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.
Asphalt concrete pavements receive maintenance to retard the loss of structural integrity and functionality. A common maintenance action to address localized failures is hot mix asphalt or cold mix patches. The result of this practice is a pavement cross-section with different binder ages. The main focus of this study is to investigate the effects of different binder ages in reclaimed material included in cement stabilized bases resulting from full depth reclamation of asphalt concrete roads. The research hypothesis for this thesis is that the new asphalt binder from hot mix patches in an aged flexible pavement has no significant effect on the stiffness properties of a cement stabilized base which has been placed using full depth reclamation. Three types of material were used in this study. The first was virgin aggregate base (AB), the second was Full Depth Reclaimed Material (FDRM) which consisted of 50% rubberized reclaimed asphalt pavement and 50% virgin aggregate base, and lastly 90% Reclaimed Asphalt Pavement (RAP) with 10% virgin aggregate base. A portion of the full depth reclaimed material and a portion of the RAP were oven aged to simulate aging in the field. The material was then stabilized with 5% cement. The tests that were conducted included maximum dry density, optimum moisture content, unconfined compressive strength, indirect tensile strength, dynamic modulus and shrinkage.The main conclusions of this study were that unaged asphaltic material in full depth reclaimed bases stabilized with cement will have a lower dynamic modulus compared to cement stabilized material made from the surrounding, aged asphaltic material. The strength properties between the aged and unaged RAP and FDRM were not significantly different. This suggests that compressive and tensile strength depends primarily on the cementitious bonds, and that the age of the asphalt binder covering the aggregates does not influence the strength. Even though this will not influence the mix design of the cement stabilized base constructed with full depth reclamation, the base will have reduced stiffnesses in localized areas which are potential fatigue failure zones for the AC surface.
Proceedings Of The 4th Congr S International De G Otechnique Ouvrages Structures
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Author : Hoang-Hung Tran-Nguyen
language : en
Publisher: Springer
Release Date : 2017-10-20
Proceedings Of The 4th Congr S International De G Otechnique Ouvrages Structures written by Hoang-Hung Tran-Nguyen and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017-10-20 with Technology & Engineering categories.
This proceedings volume for the 4th international conference CIGOS 2017 (Congrès International de Géotechnique - Ouvrages - Structures) presents novel technologies, solutions and research advances, making it an excellent guide in civil engineering for researchers, students, and professional engineers alike. Since 2010, CIGOS has become a vital forum for international scientific exchange on civil engineering. It aims to promote beneficial economic partnerships and technology exchanges between enterprises, worldwide institutions and universities. Following the success of the last three CIGOS conferences (2010, 2013 and 2015), the 4th conference was held at Ho Chi Minh City University of Technology, Ho Chi Minh City (Saigon), Vietnam on 26 to 27 October 2017. The main scientific themes of CIGOS 2017 were focused on ‘New Challenges in Civil Engineering’.
Hydraulic And Mechanical Properties Of Recycled Materials
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Author : Satish C. Gupta
language : en
Publisher:
Release Date : 2009
Hydraulic And Mechanical Properties Of Recycled Materials written by Satish C. Gupta and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009 with Aggregates (Building materials) categories.
Construction and maintenance of roads requires large volume of aggregates for use as base and subbase materials. Because of the cost of virgin aggregates, federal and state agencies are encouraging the recycling of waste materials including materials in old pavements. This study assessed the suitability of four recycled materials relative to virgin aggregates for use as base and subbase materials. The four recycled materials were the reclaimed asphalt pavement (RAP), fly ash (FA), reclaimed concrete material (RCM), and foundry sand (FS). Assessment of these materials was done in terms of their hydraulic, mechanical, and leaching properties when mixed in with various proportions of virgin aggregates. Except for slightly higher fine content in some RAP-aggregate mixtures, particle size distribution of all mixtures was within the Mn/DOT specification band for Class 5 materials. Water retention (pore size distribution), hydraulic conductivity, resilient modulus, and shear strength measurements were generally similar to that of 100% aggregates. Exception was the mixtures of FS. Heavy metal concentrations in the leachate were also generally less than the EPA drinking water standards. We concluded that FA, RAP, and RCM mixtures will be good substitutes of virgin aggregates as base and subbase materials.
Improving The Properties Of Reclaimed Asphalt Pavement For Roadway Base Applications Through Blending And Chemical Stabilization
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Author : Albert Marshall Bleakley
language : en
Publisher:
Release Date : 2012
Improving The Properties Of Reclaimed Asphalt Pavement For Roadway Base Applications Through Blending And Chemical Stabilization written by Albert Marshall Bleakley and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with categories.
Reclaimed Asphalt Pavement (RAP) is produced by milling during resurfacing operations. Finding innovative ways to incorporate RAP into highway base course applications will provide both environmental and economic benefits by allowing in situ recycling of material for projects such as widening or shoulder addition. RAP is a well-drained granular material which is already on site, however 100% RAP is low bearing strength and creeps under load. The objective of this research was to develop methods to improve RAP's strength while reducing creep to an acceptable level through blending with high quality crushed limestone aggregate and/or by chemical stabilization with asphalt emulsion, Portland cement, or lime. RAP/aggregate blends with and without chemical stabilization were compacted by modified Proctor, Marshall, or gyratory methods, cured, and tested for strength and creep. Strength tests included limerock bearing ratio (LBR), a variant of the CBR test, unconfined compression, Marshall compression, and indirect tensile tests. Strength specimens were tested dry and soaked to evaluate retained strength. One dimensional creep testing was performed using seven day oedometer tests. RAP/aggregate blends have the potential to be used successfully as a base course material. Blends of RAP with 50% limerock base material attained a soaked LBR strength of 100 and acceptable levels of creep with the addition of 1% of either asphalt emulsion or cement. Blends of RAP with 75% or more limerock attained a soaked LBR close to 100 and low levels of creep without any chemical stabilizer. In general adding RAP to limerock blends increased the soaked retained strength and improved permeability compared to 100% limerock. Gyratory compaction achieved higher densities than modified Proctor or Marshall compaction and improved RAP's strength by a factor of two to three compared to modified Proctor compaction at the same density but had less effect on creep. Field testing is required to determine whether it is feasible to reproduce the gyratory compaction results on an actual construction site. Significant variability was noted between results with different blends, compaction methods, and stabilizing agents. Site specific performance testing should be conducted to establish the viability of blending RAP into a base or subbase.
Handbook Of Research On Advancements In Environmental Engineering
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Author : Gaurina-Medjimurec, Nediljka
language : en
Publisher: IGI Global
Release Date : 2014-11-30
Handbook Of Research On Advancements In Environmental Engineering written by Gaurina-Medjimurec, Nediljka and has been published by IGI Global this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014-11-30 with Technology & Engineering categories.
The protection of clean water, air, and land for the habitation of humans and other organisms has become a pressing concern amid the intensification of industrial activities and the rapidly growing world population. The integration of environmental science with engineering principles has been introduced as a means of long-term sustainable development. The Handbook of Research on Advancements in Environmental Engineering creates awareness of the role engineering plays in protecting and improving the natural environment. Providing the latest empirical research findings, this book is an essential reference source for executives, educators, and other experts who seek to improve their project's environmental costs.
Civil And Environmental Engineering Concepts Methodologies Tools And Applications
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Author : Management Association, Information Resources
language : en
Publisher: IGI Global
Release Date : 2016-01-31
Civil And Environmental Engineering Concepts Methodologies Tools And Applications written by Management Association, Information Resources and has been published by IGI Global this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016-01-31 with Technology & Engineering categories.
Civil and environmental engineers work together to develop, build, and maintain the man-made and natural environments that make up the infrastructures and ecosystems in which we live and thrive. Civil and Environmental Engineering: Concepts, Methodologies, Tools, and Applications is a comprehensive multi-volume publication showcasing the best research on topics pertaining to road design, building maintenance and construction, transportation, earthquake engineering, waste and pollution management, and water resources management and engineering. Through its broad and extensive coverage on a variety of crucial concepts in the field of civil engineering, and its subfield of environmental engineering, this multi-volume work is an essential addition to the library collections of academic and government institutions and appropriately meets the research needs of engineers, environmental specialists, researchers, and graduate-level students.
Eleventh International Conference On The Bearing Capacity Of Roads Railways And Airfields
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Author : Inge Hoff
language : en
Publisher: CRC Press
Release Date : 2022-07-07
Eleventh International Conference On The Bearing Capacity Of Roads Railways And Airfields written by Inge Hoff and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022-07-07 with Technology & Engineering categories.
Innovations in Road, Railway and Airfield Bearing Capacity – Volume 3 comprises the third part of contributions to the 11th International Conference on Bearing Capacity of Roads, Railways and Airfields (2022). In anticipation of the event, it unveils state-of-the-art information and research on the latest policies, traffic loading measurements, in-situ measurements and condition surveys, functional testing, deflection measurement evaluation, structural performance prediction for pavements and tracks, new construction and rehabilitation design systems, frost affected areas, drainage and environmental effects, reinforcement, traditional and recycled materials, full scale testing and on case histories of road, railways and airfields. This edited work is intended for a global audience of road, railway and airfield engineers, researchers and consultants, as well as building and maintenance companies looking to further upgrade their practices in the field.