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Author: Brian Marquis Publisher: ISBN: Category : Pavements Languages : en Pages : 40
Book Description
This paper will evaluate the performance of the experimental application in which a specialized piece of equipment mills the existing bituminous pavement and base material and introduces Foamed Asphalt all in one process. The material is then graded and compacted. Traffic can operate on the stabilized base until a hot mix asphalt base and wearing surface is applied.
Author: Brian Marquis Publisher: ISBN: Category : Pavements Languages : en Pages : 40
Book Description
This paper will evaluate the performance of the experimental application in which a specialized piece of equipment mills the existing bituminous pavement and base material and introduces Foamed Asphalt all in one process. The material is then graded and compacted. Traffic can operate on the stabilized base until a hot mix asphalt base and wearing surface is applied.
Author: Hosin David Lee Publisher: ISBN: Category : Foamed materials Languages : en Pages : 116
Book Description
This study evaluates one of the recycling techniques used to rehabilitate pavement, called Cold In-Place Recycling (CIR). CIR is one of the fastest growing road rehabilitation techniques because it is quick and cost-effective. The document reports on the current practice of CIR with emulsion, presents a literature review of research on foamed asphalt, discusses the foaming experiment, presents a field data collection and compaction study, and describes the determination of mix design parameters for CIR with foamed asphalt.
Author: Hosin David Lee Publisher: ISBN: Category : Asphalt emulsion mixtures Languages : en Pages : 138
Book Description
The previous research performed laboratory experiments to measure the impacts of the curing on the indirect tensile strength of both CIR-foam and CIR-emulsion mixtures. However, a fundamental question was raised during the previous research regarding a relationship between the field moisture content and the laboratory moisture content. Therefore, during this research, both temperature and moisture conditions were measured in the field by embedding the sensors at a midpoint and a bottom of the CIR layer. The main objectives of the research are to: (1) measure the moisture levels throughout a CIR layer and (2) develop a moisture loss index to determine the optimum curing time of CIR layer before HMA overlay. To develop a set of moisture loss indices, the moisture contents and temperatures of CIR-foam and CIR-emulsion layers were monitored for five months. Based on the limited field experiment, the following conclusions are derived: The moisture content of the CIR layer can be monitored accurately using the capacitance type moisture sensor. The moisture loss index for CIR layers is a viable tool in determining the optimum timing for an overlay without measuring actual moisture contents. The modulus back-calculated based on the deflection measured by FWD seemed to be in a good agreement with the stiffness measured by geo-gauge. The geo-gauge should be considered for measuring the stiffness of CIR layer that can be used to determine the timing of an overlay. The stiffness of CIR-foam layer increased as a curing time increased and it seemed to be more influenced by a temperature than moisture content. The developed sets of moisture loss indices based on the field measurements will help pavement engineers determine an optimum timing of an overlay without continually measuring moisture conditions in the field using a nuclear gauge.
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: Andrew John Eller Publisher: ISBN: Category : Foamed materials Languages : en Pages : 55
Book Description
Foamed asphalt was discovered in Iowa by Csanyi in 1956, and has become a useful road rehabilitation tool when used in conjunction with cold in-place recycle (CIR) and full-depth reclamation (FDR) processes. The advance of pavement recycling and foaming technology has made foamed asphalt a common rehabilitation technique in many parts of the world including Europe, Asia, Africa, Canada, and parts of the United States. Iowa has used the technique extensively and has developed specifications for the construction of foamed asphalt FDR and CIR stabilized roadways. The intention of this research project, Investigation 873, is to develop FDR and CIR foamed asphalt specifications and report data and information that will assist engineers in Minnesota with successfully implementing foamed asphalt recycling techniques. There are already several foamed asphalt CIR projects in Minnesota that have been completed on low volume roads. The roadways were rehabilitated in Fillmore and Olmsted Counties from 2004 to 2008, and are performing quite well to date. The Minnesota Department of Transportation (Mn/DOT) has taken Falling Weight Deflectometer (FWD) and core data from these projects in order to examine the in-situ properties of the stabilized pavement layer, as well as the material properties of the foamed asphalt itself. The FWD data analysis reveals that the recycled pavement layer develops a relatively uniform strength despite the high variability inherent in most low-volume roads. Core data indicates that the foamed asphalt forms a cohesive matrix when mixed with the fines from the reclaimed material, which does not disintegrate when cored. Overall PG grade of the recycled layer changed significantly from the original mix in some cases, but not in others. The cause of this is unknown, however, differences in the procedures used and materials present at the different projects may help explain this. It is recommended that FWD, ground penetrating radar (GPR), and core analysis be performed before and after foamed asphalt projects to more accurately define these differences.
Author: Brian Marquis
Author: Brian Marquis
Author: 
Author: Hosin David Lee
Author: Hosin David Lee
Author: Pengcheng Fu
Author: Hechter Theyse
Author: Garret D. Reeder
Author: David Jones
Author: David Jones
Author: Andrew John Eller