Evaluation and Recommended Improvements for Mix Design of Permeable Friction Courses PDF Download
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Author: Allex E. Alvarez
Publisher:
ISBN:
Category : Asphalt
Languages : en
Pages : 163
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Author: Allex E. Alvarez
Publisher:
ISBN:
Category : Asphalt
Languages : en
Pages : 163
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Book Description
Author: Allex Eduardo Alvarez Lugo
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Permeable friction course (PFC), or new generation open-graded friction course (OGFC) mixtures, are hot mix asphalt (HMA) characterized by high total air voids (AV) content (minimum 18 %) as compared to the most commonly used dense-graded HMA. The high AV content confers to PFC mixtures both high permeability and noise reduction effectiveness. These characteristics and the high values of surface friction exhibited by PFC mixtures, as compared to dense-graded HMA, lead to improvements in safety and the environment, which make PFC one of the safest, cleanest, and quietest alternatives currently available for surface paving. The main objective of this study was improving the current PFC mix design method and construction practices in terms of compaction control. Corresponding results were integrated in an improved mix design method that is based on the guidelines of the current mix design method used by the Texas Department of Transportation. The improved mix design included modified computation of the inputs required to determine mixture density (or corresponding total AV content). These changes led to a proposed modification of the density specification for mix design from 78-82 % to 76-80 %. In addition, the water-accessible AV content was proposed as a surrogate of the total AV content for mix design and evaluation. The improved mix design method also includes verification of drainability, durability, and stone-on-stone contact. Computation of the expected value of permeability (E[k]) and measurement of the water flow value were recommended, respectively, for verification of drainability in the laboratory (using specimens compacted in the Superpave Gyratory Compactor (SGC)) and in the field. The Cantabro loss test conducted in both dry- and wet-conditions was suggested for assessing mixture durability. Improved criteria were proposed for verification of stone-on-stone contact based on the evaluation of the AV content in the coarse aggregate fraction of the mixture. In addition, comparison of the internal structure of field-and laboratory-compacted mixtures supported recommendation of a field-compaction control. Recommendations to reduce the horizontal heterogeneity of AV encountered in PFC specimens included using road cores with a minimum 152.4 mm diameter and coring SGC specimens from 152.4 to 101.6 mm in diameter.
Author: Allex E. Alvarez
Publisher:
ISBN:
Category : Pavements, Porous
Languages : en
Pages : 96
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: L. Allen Cooley
Publisher: Transportation Research Board National Research
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 142
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Book Description
TRB's National Cooperative Highway Research Program (NCHRP) Report 640: Construction and Maintenance Practices for Permeable Friction Courses explores recommended practices for the design and construction of permeable friction courses (PFC) and examines PFC maintenance and rehabilitation. NCHRP Web-Only Document 138: Annotated Literature Review for NCHRP Report 640 includes summaries of various items that were found in the literature review associated with the production of NCHRP Report 640.
Author: Bor-Wen Tsai
Publisher:
ISBN:
Category : Aggregates (Building materials)
Languages : en
Pages : 80
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Author: Gerald Huber
Publisher: Transportation Research Board
ISBN: 9780309068635
Category : Technology & Engineering
Languages : en
Pages : 124
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Book Description
This synthesis will be of interest to pavement construction, maintenance, design, and materials engineers; pavement contractors; and others interested in the use of open-graded friction course (OGFC) mixes. It describes the current state of the practice on the use of OGFC mixes, including information regarding design, materials, construction, maintenance, and rehabilitation strategies. Alternative treatments to traditional OGFC are also identified and discussed. Information was collected by surveying U.S. and Canadian transportation agencies and by conducting a literature search to gather additional insight into North American and European practices. This TRB report describes the recent performance of North American OGFC mixes and European porous asphalt by identifying benefits and stress indicators. A new generation of OGFC mixes has evolved over the last 5 years with changes that have been reported to dramatically improve performance. This synthesis describes new materials and design methods being used, as well as the applicability of the new generation of open-graded mixtures to North American use.
Author: Kai-Wei Liu
Publisher:
ISBN:
Category : Pavements, Porous
Languages : en
Pages : 138
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Author: Cindy K. Estakhri
Publisher:
ISBN:
Category : Pavements, Porous
Languages : en
Pages : 48
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Author: Samuel B. Cooper
Publisher:
ISBN:
Category : Aggregates (Building materials)
Languages : en
Pages : 70
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