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Author: Munir D. Nazzal Publisher: ISBN: Category : Binders (Materials) Languages : en Pages :
Book Description
This report summarizes the research work that was completed to assess the optimum percentages of recycled asphalt pavement (RAP) that can be used in surface course mixtures of local roadways while ensuring durability is maintained. This project was divided into two phases. Phase 1 included conducting a comprehensive laboratory testing on mixtures with different RAP contents and recycling agents. Based on the results of Phase 1, Phase 2 of this project involved constructing eight test sections as a part of a resurfacing project on Hall Road in the City of Columbus. Surface course asphalt mixtures with a similar aggregate blend but different percentages of RAP were used in these test sections. The first section (control section) had a mix with 20% RAP and PG 64-22 binder. While three test sections had mixes with 30%, 40%, 50% RAP, PG 64-22 binder, and Sylvaroad recycling agent, three other sections had mixes with the same RAP percentages and binder but used Hydrolene as the recycling agent. Finally, the last section was constructed using a mixture containing 30% RAP and PG 64-28 binder with no recycling agent. Cores were obtained at different locations within each test section. In addition, specimens were compacted in a laboratory from loose mixtures that were obtained during the construction of each test section. Tests were done on field cores and laboratory-compacted specimens. The test results showed that Hydrolene was more effective than Sylvaroad in improving the fatigue cracking resistance of RAP mixes with more than 0.3 binder. In addition, the tests results showed that the 30% RAP, 40% RAP, and 50% RAP mixes had similar low-temperature cracking resistance to that of the control. The laboratory test results also showed that all mixes had acceptable rutting resistance. The results of the cost analyses conducted in Phase 2 indicated that using a higher RAP content of 40% and recycling agents can reduce the initial cost of an asphalt mixture by at least 15%.
Author: Munir D. Nazzal Publisher: ISBN: Category : Binders (Materials) Languages : en Pages :
Book Description
This report summarizes the research work that was completed to assess the optimum percentages of recycled asphalt pavement (RAP) that can be used in surface course mixtures of local roadways while ensuring durability is maintained. This project was divided into two phases. Phase 1 included conducting a comprehensive laboratory testing on mixtures with different RAP contents and recycling agents. Based on the results of Phase 1, Phase 2 of this project involved constructing eight test sections as a part of a resurfacing project on Hall Road in the City of Columbus. Surface course asphalt mixtures with a similar aggregate blend but different percentages of RAP were used in these test sections. The first section (control section) had a mix with 20% RAP and PG 64-22 binder. While three test sections had mixes with 30%, 40%, 50% RAP, PG 64-22 binder, and Sylvaroad recycling agent, three other sections had mixes with the same RAP percentages and binder but used Hydrolene as the recycling agent. Finally, the last section was constructed using a mixture containing 30% RAP and PG 64-28 binder with no recycling agent. Cores were obtained at different locations within each test section. In addition, specimens were compacted in a laboratory from loose mixtures that were obtained during the construction of each test section. Tests were done on field cores and laboratory-compacted specimens. The test results showed that Hydrolene was more effective than Sylvaroad in improving the fatigue cracking resistance of RAP mixes with more than 0.3 binder. In addition, the tests results showed that the 30% RAP, 40% RAP, and 50% RAP mixes had similar low-temperature cracking resistance to that of the control. The laboratory test results also showed that all mixes had acceptable rutting resistance. The results of the cost analyses conducted in Phase 2 indicated that using a higher RAP content of 40% and recycling agents can reduce the initial cost of an asphalt mixture by at least 15%.
Author: Scott Koch Publisher: ISBN: 9781124451275 Category : Dust control Languages : en Pages : 321
Book Description
As more Recycled Asphalt Pavement (RAP) becomes available to use in roadways, The Wyoming T2/LTAP Center and two Wyoming counties investigated the use of RAP in gravel roads. The Wyoming DOT along with the Mountain Plains Consortium funded this study. The investigation explored the use RAP as a means of dust suppression on gravel roads while considering road serviceability. Several test sections were constructed in two Wyoming counties and were monitored for dust loss using the Colorado State University Dustometer. Surface distress evaluations of the test sections were performed following a technique developed by the U.S. Army Corps of Engineers in Special Report 92-26: Unsurfaced Road Maintenance Management. The data collected was summarized and statistically analyzed. The performance of RAP sections was compared to the performance of gravel control sections. This comparison allowed for fundamental conclusions and recommendations to be made for RAP and its ability for dust abatement. It was found that RAP incorporated gravel roads can reduce dust loss without adversely affecting the road's serviceability. Other counties and agencies can expand on this research to add another tool to their toolbox for dust control on gravel roads.
Author: National Research Council (U.S.). Transportation Research Board Publisher: Transportation Research Board National Research ISBN: Category : Nature Languages : en Pages : 64
Book Description
"This synthesis will be of special interest and usefulness to design engineers, materials technologists, and others seeking information on the potential use of recycled materials in design, construction, rehabilitation, and maintenance of pavements, bases, and other components of the highway system. Detailed information is presented on procedures for pavement recycling."--Avant-propos.
Author: Marco Pasetto Publisher: Springer Nature ISBN: 3030297799 Category : Science Languages : en Pages : 503
Book Description
This volume highlights the latest advances, innovations, and applications in the field of asphalt pavement technology, as presented by leading international researchers and engineers at the 5th International Symposium on Asphalt Pavements & Environment (ISAP 2019 APE Symposium), held in Padua, Italy on September 11-13, 2019. It covers a diverse range of topics concerning materials and technologies for asphalt pavements, designed for sustainability and environmental compatibility: sustainable pavement materials, marginal materials for asphalt pavements, pavement structures, testing methods and performance, maintenance and management methods, urban heat island mitigation, energy harvesting, and Life Cycle Assessment. The contributions, which were selected by means of a rigorous international peer-review process, present a wealth of exciting ideas that will open novel research directions and foster multidisciplinary collaboration among different specialists.
Author: Marco Dorigo Publisher: MIT Press ISBN: 9780262042192 Category : Computers Languages : en Pages : 324
Book Description
An overview of the rapidly growing field of ant colony optimization that describes theoretical findings, the major algorithms, and current applications. The complex social behaviors of ants have been much studied by science, and computer scientists are now finding that these behavior patterns can provide models for solving difficult combinatorial optimization problems. The attempt to develop algorithms inspired by one aspect of ant behavior, the ability to find what computer scientists would call shortest paths, has become the field of ant colony optimization (ACO), the most successful and widely recognized algorithmic technique based on ant behavior. This book presents an overview of this rapidly growing field, from its theoretical inception to practical applications, including descriptions of many available ACO algorithms and their uses. The book first describes the translation of observed ant behavior into working optimization algorithms. The ant colony metaheuristic is then introduced and viewed in the general context of combinatorial optimization. This is followed by a detailed description and guide to all major ACO algorithms and a report on current theoretical findings. The book surveys ACO applications now in use, including routing, assignment, scheduling, subset, machine learning, and bioinformatics problems. AntNet, an ACO algorithm designed for the network routing problem, is described in detail. The authors conclude by summarizing the progress in the field and outlining future research directions. Each chapter ends with bibliographic material, bullet points setting out important ideas covered in the chapter, and exercises. Ant Colony Optimization will be of interest to academic and industry researchers, graduate students, and practitioners who wish to learn how to implement ACO algorithms.
Author: Nick Thom Publisher: Emerald Group Publishing ISBN: 1835497101 Category : Technology & Engineering Languages : en Pages : 448
Book Description
Principles of Pavement Engineering, Third edition is an essential reference on fundamental principles of pavement engineering, showing how to design, construct, evaluate and maintain pavements of all types.
Author: Munir D. Nazzal
Author: Munir D. Nazzal
Author: Amro Abushama
Author: Asphalt Institute
Author: Scott Koch
Author: National Research Council (U.S.). Transportation Research Board
Author: 
Author: Marco Pasetto
Author: 
Author: Marco Dorigo
Author: Nick Thom