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Author: Robert Benjamin Hill Publisher: ISBN: 9781303057618 Category : Pavements, Asphalt Languages : en Pages : 274
Book Description
Full-Depth Reclamation (FDR) is a cost-effective rehabilitation treatment for deteriorated pavements. However, when using asphalt emulsion based rehabilitation techniques one of the most challenging aspects of FDR is determining when traffic can be returned to the rehabilitated pavement surface. Since asphalt emulsion mixtures need ample time for curing, they cannot be sealed with a surface layer until the water has evaporated from the rehabilitated layer. It is often not possible to keep the road closed until all of the water has evaporated and the surface layer is placed, therefore, at some point the traffic needs to be returned to the rehabilitated surface. Determining when this point occurs, however, is still unclear. A laboratory raveling test run on Superpave Gyratory Compactor prepared samples simulates the raveling that can occur on the newly recycled pavement, and will be used in conjunction with inexpensive, simple tests that can be used in the field by agencies and contractors to determine if traffic can be released without causing damage to the rehabilitated pavement surface. Three mix designs were analyzed and used in conjunction to produce the emulsion and foam samples used in the testing. An optimum emulsion content was found and used to produce all of the samples. Based on a review of literature and an evaluation of practicality, four tests are recommended to be modeled for field use: British Pendulum Tester, Dynamic Friction Tester, a field-scale cohesiometer, and a rebound tester. The in-house testers were put through numerous tests on asphalt emulsion and asphalt foam samples. It was decided that of all of the testers, the one that showed the most potential was the Sweep Tester. Alterations to improve the devices were stated after all of the testing was completed.
Author: Robert Benjamin Hill Publisher: ISBN: 9781303057618 Category : Pavements, Asphalt Languages : en Pages : 274
Book Description
Full-Depth Reclamation (FDR) is a cost-effective rehabilitation treatment for deteriorated pavements. However, when using asphalt emulsion based rehabilitation techniques one of the most challenging aspects of FDR is determining when traffic can be returned to the rehabilitated pavement surface. Since asphalt emulsion mixtures need ample time for curing, they cannot be sealed with a surface layer until the water has evaporated from the rehabilitated layer. It is often not possible to keep the road closed until all of the water has evaporated and the surface layer is placed, therefore, at some point the traffic needs to be returned to the rehabilitated surface. Determining when this point occurs, however, is still unclear. A laboratory raveling test run on Superpave Gyratory Compactor prepared samples simulates the raveling that can occur on the newly recycled pavement, and will be used in conjunction with inexpensive, simple tests that can be used in the field by agencies and contractors to determine if traffic can be released without causing damage to the rehabilitated pavement surface. Three mix designs were analyzed and used in conjunction to produce the emulsion and foam samples used in the testing. An optimum emulsion content was found and used to produce all of the samples. Based on a review of literature and an evaluation of practicality, four tests are recommended to be modeled for field use: British Pendulum Tester, Dynamic Friction Tester, a field-scale cohesiometer, and a rebound tester. The in-house testers were put through numerous tests on asphalt emulsion and asphalt foam samples. It was decided that of all of the testers, the one that showed the most potential was the Sweep Tester. Alterations to improve the devices were stated after all of the testing was completed.
Author: Robert Hill Publisher: ISBN: Category : Asphalt emulsion Languages : en Pages : 10
Book Description
Full depth reclamation (FDR) is a pavement structure rehabilitation technique that uses in-place material to build structural capacity of a roadway. By mixing together 8-12 in. of pavement structure with a binding agent, a higher structural capacity can be achieved. However, there is often a period of time prior to the binding agent fully curing where traffic is released to the FDR before a surface course is applied. In this research, five laboratory testing devices attempted to quantify how asphalt cement based FDR builds resistance to raveling during this traffic. Four in-house designed and built testing devices were compared to the existing cold in-place recycling raveling test. Factors explored during evaluation included curing time (0-48 h), binding agent (asphalt emulsion and asphalt foam), and curing condition (ambient temperature and 40°C). In general, all five testing devices showed a decrease in potential raveling with longer curing times using an asphalt emulsion binding agent at ambient curing temperatures. Asphalt emulsion FDR showed higher resistance to raveling than asphalt foam FDR at ambient curing temperatures, but curing at 40°C did not give conclusive evidence on resistance to raveling versus ambient curing temperatures. Finally, this testing was applied in the laboratory to give a general indication of the performance of each testing device; therefore, the testing devices need to be taken into the field to verify these initial laboratory findings and to begin building correlations between the lab test results and actual raveling susceptibility in the field.
Author: David Robert Luhr Publisher: ISBN: 9780893122478 Category : Pavements, Asphalt Languages : en Pages : 15
Book Description
Full-depth reclamation (FDR) is a roadway rehabilitation process that recycles the materials from deteriorated asphalt pavement, and, with the addition of portland cement, creates a new stabilized base. This guide to FDR discusses its applications, benefits, design, construction, and testing.
Author: Garret D. Reeder Publisher: ISBN: Category : Pavements, Asphalt Languages : en Pages : 90
Book Description
As the nation’s infrastructure ages, agencies at all levels are tasked with maintaining and rehabilitating their infrastructure. Sustainable engineering technologies in pavement rehabilitation, such as full-depth reclamation (FDR), could be the answer for agencies in their quest to provide taxpayers with high-quality infrastructure while being good stewards of public funds. Full-depth reclamation of asphalt pavement is a rehabilitation method that involves recycling an existing asphalt pavement and its underlying layer(s) into a new base layer. The FDR process begins with using a road reclaimer to pulverize an existing asphalt pavement and a portion of the underlying base, subbase, and/or subgrade. Usually the pulverized material is uniformly blended with an additional stabilizing material such as cement to provide an upgraded, homogeneous material. Finally, the stabilized material is compacted in place with rollers. The result is a stiff, stabilized base that is ready for a new rigid or flexible surface course. This guide introduces the FDR with cement process and discusses issues related to project selection, design, construction, and testing/quality control.
Author: Harikrishnan Nair Publisher: ISBN: Category : Low-volume roads Languages : en Pages : 26
Book Description
The Virginia Department of Transportation (VDOT) maintains more than 100,500 lane-miles of pavement on the secondary network. Of this total, more than 95% of the lane-miles have an annual average daily traffic of less than 3,500 vehicles. Pavement recycling techniques (such as full depth reclamation [FDR] and cold in-place recycling) can be used to fix many underlying issues in an existing pavement and when combined with thin surfacings, where appropriate, can help VDOT maintain low volume roads and provide significant cost and environmental savings. However, VDOT has limited experience using pavement recycling techniques (especially FDR) where pavement is overlaid with thin surfacings. The purpose of this study was to document the performance baseline for a series of FDR sections having thin surfacings on lower volume traffic routes since the performance of these types of pavements was previously unknown. This study summarized the construction and initial performance of the FDR field projects on Rte. 602 in Surry County in VDOT’s Hampton Roads District and at Estates at Leeland in Spotsylvania County in VDOT’s Fredericksburg District; in addition, an inventory was conducted and the performance of past VDOT FDR projects on lower traffic routes was evaluated. The study found that the initial performance of the FDR project on Rte. 602 (having three thin surfacing treatments) and the FDR project at Estates at Leeland (having a 2-in asphalt concrete surface) was promising at early ages. However, the information gathered to date is not sufficient to make conclusions about the long-term performance of FDR with thin surfacings. In general, for the past FDR projects reviewed, based on visual surveys and data from VDOT’s Pavement Management System, FDR with 2 to 4 in of asphalt concrete surface performed well at ages of 7 to 13 years after construction. The study recommends continued performance assessment of the FDR sites surveyed in this study and additional field trials on the secondary network system using FDR with thin surfacings. Further research is also recommended to develop a framework to consider using performance data from VDOT’s Pavement Management System to predict the future conditions of pavement sections on the secondary network. Being able to identify those sections that could benefit from FDR treatments in the future would allow VDOT to allocate funding proactively for those sections based on early findings from this study.
Author: A.F. Nikolaides Publisher: CRC Press ISBN: 1040147089 Category : Technology & Engineering Languages : en Pages : 999
Book Description
Bituminous Mixtures and Pavements VIII contains 114 papers as presented at the 8th International Conference ‘Bituminous Mixtures and Pavements’ (8th ICONFBMP, 12-14 June 2024, Thessaloniki, Greece). The contributions reflect the research and practical experience of academics and practicing engineers from thirty-four (34) different countries, and cover a wide range of topics: Session I: Bitumen, Modified binders, Aggregates, and Subgrade Session II: Bituminous mixtures (Design, Construction, Testing, Performance) Session III: Pavements (Design, Construction, Maintenance, Sustainability, Energy and Environmental consideration) Session IV: Pavement management and Geosynthetics Session V: Pavement recycling Session VI: Pavement surface characteristics, Pavement performance monitoring, Safety Session VII: Biomaterials in pavement engineering Session VIII: Prediction models of pavement performance Bituminous Mixtures and Pavements VIII covers recent advances in highway materials technology and pavement engineering, and will be of interest to scientists and professionals involved or interested in these areas. The ICONFBMP-conferences have been organized every four years since 1992. This 8th conference was jointly organized by: Laboratory of Highway Engineering, Aristotle University of Thessaloniki, Greece; Built Environment Research Institute (BERI), University of Ulster, UK; University of Texas San Antonio (UTSA), USA; Laboratory for Advanced Construction Technology (LACT), Technological Institute of Iowa, USA; Technological University of Delft (TUDelft), The Netherlands, and University of Antwerp, (UA), Belgium.
Author: Frederick Hugo Publisher: Transportation Research Board ISBN: 0309069742 Category : Accelerated life testing Languages : en Pages : 213
Book Description
TRB's National Cooperative Highway Research Program (NCHRP) Synthesis 325: Significant Findings from Full-Scale Accelerated Pavement Testing documents and summarizes the findings from the various experimental activities associated with full-scale accelerated pavement testing programs.
Author: Eskedil Abebaw Melese Publisher: ISBN: Category : Languages : en Pages :
Book Description
According to a recent report, 16.4% of Canadian roads are in a poor or very poor condition. This means 146,255 km of the Canadian roads are either unfit for service or are approaching the end of their service life. The roads in these conditions require immediate action to restore their serviceability. One of the plausible techniques that could be applied to restore the serviceability of roads in poor or very poor conditions is full-depth reclamation (FDR). Full depth reclamation is a type of pavement cold in-place recycling in which the existing old and deteriorated pavement is pulverised, treated with appropriate stabilizer and compacted to form a strong base layer. In Canada, the stabilizers commonly used in the FDR process are asphalt emulsions, foamed asphalt, and Portland cement. Hydraulic road binders (HRB), however, are alternative cementitious stabilizers that can be used in full-depth reclamation process with some better attributes than Portland cement. The main objectives of this research are characterisation and impact assessment of fully reclaimed pavement materials treated with HRB. The study was conducted in the form of comparative assessment by using reclaimed materials treated with General Use (GU) cement as control mixes. Four types of reclaimed materials and four types of cementitious binders, including GU cement, were used to make sixteen different mixes. Characterisation and performance tests were conducted to understand the behaviour of the mixtures under static and dynamic loadings. Besides, life-cycle assessment was conducted to investigate the environmental impacts of the different cementitious binders. The findings of the study indicate that HRB, of the type used in the study, can be used in full-depth reclamation process without compromising the strength and durability of the mixtures. However, not all HRB substantially reduce the environmental impacts and energy requirements. Among the binders used in the study, the HRB with the lowest C/S ratio can significantly reduce the global warming potential.
Author: Dharamveer Singh Publisher: Springer Nature ISBN: 9819960908 Category : Technology & Engineering Languages : en Pages : 846
Book Description
This book is a collection of selected research papers from the 14th conference of the Transportation Planning and Implementation Methodologies for Developing Countries (TPMDC). It covers the broad area of transportation planning and policy, pavement design and engineering, emerging technologies in transportation, traffic management, operations, and safety, and sustainable mobility in transportation. The book aims to provide deeper understanding of the transportation issues, solutions, and learnings from the implemented solutions. This book will be of best interest for academicians, researchers, policy makers, and practitioners.
Author: Robert Benjamin Hill
Author: Robert Benjamin Hill
Author: Robert Hill
Author: David Robert Luhr
Author: Paulo Pereira
Author: Garret D. Reeder
Author: Harikrishnan Nair
Author: A.F. Nikolaides
Author: Frederick Hugo
Author: Eskedil Abebaw Melese
Author: Dharamveer Singh