Author: Thomas F. Wolff
Publisher:
ISBN:
Category : Pavements
Languages : en
Pages :

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Author: Jiemin Zhang
Publisher:
ISBN:
Category : Pavements, Asphalt concrete
Languages : en
Pages : 582

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Book Description

Author: Mary Stroup-Gardiner
Publisher: Transportation Research Board
ISBN: 9780309066525
Category : Asphalt
Languages : en
Pages : 108

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Author: Stephen Alan Cross
Publisher:
ISBN:
Category : Aggregates (Building materials)
Languages : en
Pages : 56

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Book Description
Segregation of hot mix asphalt is a recurring problem in the paving industry. There is little documented research that quantifies the effects of segregation on mix properties and performance. The Asphalt Pavement Analyzer (APA) is a new class of pavement tester available to evaluate pavement performance. The APA can evaluate the rutting potential, moisture susceptibility and fatigue life of bituminous mixtures. Materials were available from a previous study (K-TRAN: KU-96-6) on segregation for use in evaluating the use of the APA with Kansas mixtures and materials. Two surface mixes, a BM-1B and BM-2, were fabricated to different levels of segregation as determined in the K-TRAN: KU-96-6 study. The mixtures were tested in the APA for rutting, moisture damage and fatigue life.

Author: Stephen Alan Cross
Publisher:
ISBN:
Category : Aggregates (Building materials).
Languages : en
Pages : 138

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Book Description
Segregation of hot mix asphalt is a recurring problem in the paving industry. There is little documented research that quantifies the effect of segregation on mix properties and pavement performance. Many state highway agencies are embracing performance based quality control/quality assurance (QC/QA) programs but only a few states have performed studies to quantify the effect of segregation on pavement performance. This study was conducted on four newly constructed pavements which had noticeable spots of segregation. Cores were obtained from both segregated and non-segregated sections of the four pavements. The unit weights of the pavements were determined using a thin-lift nuclear gauge. The change in gradation on the 4.75 mm sieve was compared with asphalt content, nuclear gauge unit weight, core unit weight, and macro texture to determine if an indicator test could quantify segregation. The cores were tested for moisture sensitivity, fatigue life, and indirect tensile strength to determine the effect of segregation on performance.

Author:
Publisher:
ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 740

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Author: M. Stroup-Gardiner
Publisher:
ISBN:
Category : HMA segregation
Languages : en
Pages : 10

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Previous research indicated that density, gradation, and asphalt content change due to segregation. A rolling nuclear gage capable of measuring both density and hydrogen count was evaluated for its ability to detect and measure both density and asphalt content. Eight projects (four recently constructed pavements and four during construction) were used to evaluate this instrument. Longitudinal density profiles were obtained for each project at transverse quarter points across the lane. Additional testing included infrared thermography and traditional destructive testing of cores.

Author: Shad M. Sargand
Publisher:
ISBN:
Category : Aggregates (Building materials)
Languages : en
Pages : 250

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Book Description
Segregation in asphalt pavement can manifest either as variation in the gradation of the aggregate in the asphalt mix (gradation segregation) or as variation in the temperature (thermal segregation), and both may occur together. Perhaps the primary cause of segregation is improper handling during mixing, transportation, and placement of the asphalt, which can occur at the silo or at the end of the load or elsewhere in the paving process. This report includes a literature review, national survey of state DOTs, and review of construction and materials specifications to assess the current state of the practice in mitigating segregation in asphalt pavement. Recommendations for possible implementation are given.

Author: Stephen Sebesta
Publisher: Transportation Research Board
ISBN: 0309129346
Category : Technology & Engineering
Languages : en
Pages : 91

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Book Description
At head of title: The Second Strategic Highway Research Program.

Author: JN. Meegoda
Publisher:
ISBN:
Category : Air voids
Languages : en
Pages : 11

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Book Description
This paper describes development of an automated technology to quantify surface segregation seen during construction of hot mix asphalt concrete pavements. Segregation manifested on the surface produces nonuniform surface macrotecture. A laser-based system was used for detection of nonuniform surface macrotexture caused by segregation. Two segregated test sections and a control test section were tested to evaluate the laser texture method. Laser texture data were gathered from three sites, and sand patch and nuclear density tests were performed at 25 ft (7.62 m) intervals along three sections. In addition to the above, visual surveys were performed to confirm the measurements. Based on the test results, it was found that the nuclear density test could not be used to detect surface segregation but it could be used as a confirmation test. Test results from the control section were used to establish a correlation between the sand patch tests and the laser texture data.