Longitudinal Joint Density and Permeability in Asphalt Concrete PDF Download
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Author: Stephen Alan Cross
Publisher:
ISBN:
Category : Pavements, Asphalt concrete
Languages : en
Pages : 46
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Book Description
Author: Stephen Alan Cross
Publisher:
ISBN:
Category : Pavements, Asphalt concrete
Languages : en
Pages : 46
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Book Description
Author: R. Christopher Williams
Publisher:
ISBN:
Category : Pavements, Asphalt
Languages : en
Pages : 66
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Book Description
Longitudinal joint quality control/assurance is essential to the successful performance of asphalt pavements and it has received considerable amount of attention in recent years. The purpose of the study is to evaluate the level of compaction at the longitudinal joint and determine the effect of segregation on the longitudinal joint performance. Five paving projects with the use of traditional butt joint, infrared joint heater, edge restraint by milling and modified butt joint with the hot pinch longitudinal joint construction techniques were selected in this study. For each project, field density and permeability tests were made and cores from the pavement were obtained for in-lab permeability, air void and indirect tensile strength. Asphalt content and gradations were also obtained to determine the joint segregation. In general, this study finds that the minimum required joint density should be around 90.0% of the theoretical maximum density based on the AASHTO T166 method. The restrained-edge by milling and butt joint with the infrared heat treatment construction methods both create the joint density higher than this 90.0% limit. Traditional butt joint exhibits lower density and higher permeability than the criterion. In addition, all of the projects appear to have segregation at the longitudinal joint except for the edge-restraint by milling method.
Author: R.Christopher Williams
Publisher:
ISBN:
Category : Pavements, Asphalt
Languages : en
Pages : 61
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Book Description
The density and air void content of asphalt mixtures affect the durability and performance of asphalt pavements. Pavement longitudinal joints typically have a lower density than the mat because they receive less compaction than the center section of the mat for various reasons. The higher air void percentages resulting from lower densities can lead to high permeability and allow water infiltration, which in turn can cause moisture-induced damage and decrease base and subbase support to the pavement, reducing pavement life. Void-reducing asphalt membrane (VRAM) has been used at the longitudinal joints of asphalt pavements to achieve higher densities and prevent moisture infiltration, thereby reducing deterioration at the longitudinal joints. VRAM is applied before the hot-mix asphalt (HMA) layer is placed and migrates into the HMA to fill 50% to 70% of the air voids. This research evaluated the extent to which J-Band, a VRAM product, increases density and improves performance. Field cores were collected from two sections, one with and one without VRAM. Asphalt mixture performance tests, including disk compact tension and semi-circular bend tests, and push-pull tests were carried out in the laboratory on the field-collected specimens. Volumetric measurements were also taken, and ground penetrating radar was used in the field. It was determined that the pavement sections with VRAM had a lower permeability, higher bond energy, and higher fracture energy than the pavement sections without VRAM.
Author:
Publisher:
ISBN:
Category : Pavements, Asphalt
Languages : en
Pages : 12
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Book Description
This digest summarizes key findings from NCHRP Project 9-15 ... conducted by Fugro Consultants LP ... [and] ... is an abridgement of portions of the final report prepared by Brian M. Killingsworth ...
Author: Cindy K. Estakhri
Publisher:
ISBN:
Category : Pavements, Asphalt concrete
Languages : en
Pages : 12
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Author: Antonin Du Tertre
Publisher:
ISBN:
Category :
Languages : en
Pages : 242
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Book Description
Longitudinal joints are one of the critical factors that cause premature pavement failure. Poor-quality joints are characterized by a low density and high permeability; which generates surface distresses such as ravelling or longitudinal cracking. Density has been traditionally considered as the primary performance indicator of joint construction. Density measurements consist of taking cores in the field and determining their density in the laboratory. Although this technique provides the most accurate measure of joint density, it is destructive and time consuming. Nuclear and non-nuclear gauges have been used to evaluate the condition of longitudinal joint non-destructively, but did not show good correlation with core density tests. Consequently, agencies are searching for other non-destructive testing (NDT) options for longitudinal joints evaluation. NDT methods have significantly advanced for the evaluation of pavement structural capacity during the past decade. These methods are based either on deflection or wave velocity measurements. The light weight deflectometer (LWD) is increasingly being used in quality control/quality assurance to provide a rapid determination of the surface modulus. Corresponding backcalculation programs are able to determine the moduli of the different pavement layers; these moduli are input parameters for mechanistic-empirical pavement design. In addition, ultrasonic wave-based methods have been studied for pavement condition evaluation but not developed to the point of practical implementation. The multi-channel analysis of surface waves (MASW) consists of using ultrasonic transducers to measure surface wave velocities in pavements and invert for the moduli of the different layers. In this study, both LWD and MASW were used in the laboratory and in the field to assess the condition of longitudinal joints.
Author: Cindy K. Estakhri
Publisher:
ISBN:
Category : Pavements, Asphalt
Languages : en
Pages : 133
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Book Description
When placing hot-mix asphalt concrete (HMAC), paving the full width of the pavement in a single pass is usually impossible; therefore, most bituminous pavements contain longitudinal construction joints. These construction joints can often be inferior to the rest of the pavement and can eventually cause an otherwise sound pavement to deteriorate more quickly. The objectives of this project were to (1) assess the density along the longitudinal construction joint of several Texas pavements to determine if a problem exists; (2) document information from the literature; (3) synthesize aviation construction data where a history of a joint density specification exists to determine if such a requirement can be met by paving contractors; and (4) modify current HMAC specifications to require joint density measurements if justification is verified.
Author: Muhammet Vefa Akpinar
Publisher:
ISBN:
Category : Pavements, Asphalt concrete
Languages : en
Pages : 50
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Book Description
The objective of this research project was to conduct a literature review on longitudinal joint construction for hot- mix asphalt pavements. The review covered the issues related to the principles of hotmix asphalt paving and compaction for longitudinal joint construction, longitudinal joint problems, and some longitudinal joint construction techniques and specifications from different studies. Specific recommendations have also been made for application in the State of Kansas.
Author: S. O. Linzell
Publisher:
ISBN:
Category :
Languages : en
Pages : 81
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Book Description
Author: Peter E. Sebaaly
Publisher:
ISBN:
Category : Pavements, Asphalt
Languages : en
Pages : 42
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Book Description
