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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: 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: Jon A. Epps Publisher: Transportation Research Board ISBN: 9780309049115 Category : Technology & Engineering Languages : en Pages : 116
Book Description
This synthesis will be of interest to pavement designers, construction engineers, and others interested in economical methods for reconstructing or rehabilitating bituminous pavements. Information is provided on the processes and procedures used by a number of states to recycle asphalt pavements in place without application of heat. Since 1975 a growing number of state highway agencies have reconstructed or rehabilitated asphalt pavements by recycling the old pavement in place. This report of the Transportation Research Board describes the processes used for cold in-place recycling, including construction procedures, mix designs, mixture properties, performance, and specifications.
Author: Publisher: ISBN: Category : Pavements, Asphalt Languages : en Pages : 103
Book Description
Full-depth reclamation (FDR) as a rehabilitation method improves the service life of pavement structures by reusing asphalt materials, thereby reducing costs and allowing for conservation of nonrenewable resources. However, the lack of mechanicsbased material testing procedures and performance-based specifications limit the use of FDR processes. First, the FDR design and construction process are presented, then, a literature review focusing on FDR research is completed, and a survey is conducted to obtain relevant information regarding current FDR practices in Minnesota. Next, Indirect Tensile Test (IDT) and Dynamic Modulus Test in IDT mode testing is performed on four FDR materials: Field mixed, Lab compacted; Lab mixed, Lab compacted; FDR with cement additive; and FDR with graphene nanoplatelet (GNP) additive. Two curing times are used to determine how physical properties change over time. Test results are used to perform simulations in MnPAVE software and a Life Cycle Cost Analysis (LCCA). Laboratory observations indicate that cement additive reduces predicted life and increases critical cracking temperature with a slight increase in cost; GNP additive reduces predicted life but also reduces critical cracking temperature with a significant cost increase; Lab mixed samples performed better than Field mixed, suggesting that field methods could be improved; and curing has a positive effect on the FDR materials with cement and GNP additives--for both materials, the dynamic modulus increase, and the GNP samples also had a slight increase in tensile strength. MnPAVE simulations and LCCA results indicate that over a 35-year period, FDR may be a more cost-effective method than traditional mill and overlay.
Author: American Association of State Highway and Transportation Officials Publisher: AASHTO ISBN: 156051423X Category : Pavements Languages : en Pages : 218
Author: Blnd Jasim Othman Publisher: ISBN: Category : Languages : en Pages : 278
Book Description
Full depth reclamation (FDR) is apavement repair method that uses in-place milling and recycling of existing asphalt to rehabilitate roads. The FDR process includes milling the existing pavement, blending the crushed pavement with underlying aggregate materials and chemical stabilizing agents to create a new stabilized base course. Usually a thin wearing course in placed on top of the stabilized base. The purpose of this research was to investigate the effects of a combination stabilizing agents added to different blends of reclaimed asphalt pavement (RAP) and high quality limerock aggregate base material on the strength and creep of blended materials. Strength and deformation of the blends were evaluated using the California Bearing Ratio (CBR), modified Marshall, and one-dimensional oedometer creep tests. Blends of RAP and limerock base were blended with Portland cements and asphalt emulsion in varying proportions. Blends in this study were prepared at 0%, 25%, 50%, 75%, and 100% RAP by weight. Specimen mixtures consisted of25, 50, and 75 percent RAP stabilized with 0.0, 0.5, 1.0, 1.5, and 2.0 percent Type I/Il Portland cement and 0,0, 0.5, .1.0, 1.5, and 2.0 percent Cationic Asphalt Emulsion (CSS-1H) by weight. The 0% RAP samples were controls of pure limerock aggregate; 100% RAP samples were controls of pure RAP. The objective of these projects was to obtain baseline data and to evaluate stabilizing, curing and testing techniques for chemically stabilized specimens. Increasing RAP content decreased the strength and increased the deflection of blends. For blends without chemical stabilization, only the 25% RAP/75% Iimerock blend achieved an average soaked CBR over 80. For chemically stabilized blends, increasing cement content always increased strength and decreased deflection. Asphalt emulsion stabilized blends showed peak strength (CBR and Marshall Stability) at 1% and 1.5% emulsion for 50% and 25% RAP blends. A very good correlation was found between soaked CBR and soaked Marshall stability with an average R2 of 0.73.
Author: Imran M. Syed Publisher: ISBN: 9780893122621 Category : Pavements, Asphalt Languages : en Pages : 54
Book Description
Full-Depth Reclamation (FDR) with cement is a procedure where failed asphalt pavements are pulverized and reclaimed, using cement to stabilize the recycled materials and create a new pavement base. This cement stabilized base is then surfaced to provide an new, long-lasting pavement structure. This report summarizes the long-term performance of pavement construction projects where the FDR with cement process has been used. The actual field performance of more than 75 projects in eight states were evaluated. The average project age was 9 years, and the oldest was 26 years. Overall the performance of the FDR with cement projects has been excellent. There was no evidence of premature structural failure in any of the sections. In addition, the economics of the process has helped the agencies reconstruct 50% to 100% more projects than the conventional remove and replace methods.
Author: David Robert Luhr
Author: David Robert Luhr
Author: Garret D. Reeder
Author: Asphalt Recycling & Reclaiming Association
Author: Jon A. Epps
Author: 
Author: American Association of State Highway and Transportation Officials
Author: Blnd Jasim Othman
Author: Imran M. Syed
Author: Asphalt Institute
Author: United States. Federal Highway Administration