Development of a Test to Measure the Tendency for a Hot-mix Asphalt to Segregate PDF Download
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Author: Jack Edward Stephens
Publisher:
ISBN:
Category : Asphalt
Languages : en
Pages : 0
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Author: Jack Edward Stephens
Publisher:
ISBN:
Category : Asphalt
Languages : en
Pages : 0
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Author: Mary Stroup-Gardiner
Publisher: Transportation Research Board
ISBN: 9780309066525
Category : Asphalt
Languages : en
Pages : 108
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Author: Chieh-Min Chang
Publisher:
ISBN:
Category : Asphalt
Languages : en
Pages : 8
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Book Description
Since the identification of segregation on asphalt pavements has been based on visual observations around the world, it is essential to develop a quantitative method to detect the presence and severity of segregation.The nonnuclear density device was selected for the field measurements at nine test sites, and cores were taken for laboratory testing.The nonnuclear density difference between segregated and control areas was found to increase with increasing the segregation severity.For medium or heavy segregated areas, the nonnuclear density difference was more than 90 kg/m3.In medium or heavy segregated areas, the air voids increased by 20 % and the indirect tensile strength decreased by 8 % as compared to the control areas.The criterion to detect segregation was based on the statistical differences in nonnuclear measured density values with a p-value 0.05.If a statistical difference in nonnuclear density between segregated and control areas existed, the chance of aggregate gradation difference in percent passing the 3/8 in., No.4 and No.8 sieves for medium and heavy segregation was 78 and 64 %, respectively.In addition to the field nonnuclear density readings, the material properties of asphalt mixtures obtained from 108 cores, including texture depth and percent air voids were selected as independent variables to develop a model to predict the calibrated nonnuclear density difference between the segregated and control areas.This quantitative model holds a great promise as a tool to identify potential areas of segregation using both lab data and field nonnuclear density measurements for quality assurance purposes.
Author:
Publisher:
ISBN:
Category : Highway research
Languages : en
Pages : 340
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Author: Louay Nadhim Mohammad
Publisher: ASTM International
ISBN: 0803134959
Category : Anisotropy
Languages : en
Pages : 216
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Author:
Publisher:
ISBN: 9780309066525
Category : Asphalt
Languages : en
Pages : 95
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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: Mohd Rosli Hainin
Publisher:
ISBN:
Category :
Languages : en
Pages : 122
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Author: Stephen Alan Cross
Publisher:
ISBN:
Category : Aggregates (Building materials)
Languages : en
Pages : 56
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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: Anne-Marie H. McDonnell
Publisher:
ISBN:
Category : Highway engineering
Languages : en
Pages : 174
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Book Description
