Author: Hussain U. BahiaPublisher:
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 180
Book Description
Characterization of Modified Asphalt Binders in Superpave Mix Design
Author: Hussain U. BahiaPublisher:
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 180
Book Description
Characterization of Modified Asphalt Mixtures
Author: Masahiro NakamuraPublisher:
ISBN:
Category : Asphalt concrete
Languages : en
Pages : 290
Book Description
Characterization of Alaskan Modified Asphalt Binders and Mixtures
Author: Jun LiuPublisher:
ISBN:
Category :
Languages : en
Pages : 191
Book Description
"Modified asphalt binders and mixtures have been used more in recent years in Alaska. However, there has not been systematic characterization and performance data development for these materials. This study intends to systematically characterize the Alaskan asphalt binders and mixtures and identify the performance benefits of these materials through laboratory tests and field sections monitoring. The research contains five sections: 1) a comprehensive characterization on the morphologies, chemical and rheological properties of modified asphalt binders and mechanical properties of asphalt mixtures with these modified asphalt binders. The lab testing results were further confirmed through field surveys of recent paving projects constructed in Alaska and data from pavement sections in long-term pavement performance database. 2) an investigation on the applicability of the multiple stress creep recovery (MSCR) tests to evaluate the rutting resistance of Alaskan modified asphalt binders. Within the scope of the study, significance of MSCR key testing factors was assessed through four test methods with different testing protocols and procedures. 3) an evaluation of cracking susceptibility of Alaskan modified asphalt binders using various chemical and rheological indices. 4) an investigation on the connections between the chemical changes by oxidation with the rheological parameters. 5) A study to characterize the fatigue behaviors of the Alaskan highly polymerized asphalt binders using newly developed linear amplitude sweep (LAS) test with viscoelastic continuum damage (VECD) model"--Abstract, page iv.
Understanding the Performance of Modified Asphalt Binders in Mixtures
Author: Kevin D. StuartPublisher:
ISBN:
Category : Asphalt
Languages : en
Pages :
Book Description
The overall objective of this study was to determine if the Superpave high-temperature rheological properties of polymer-modified asphalt binders correlate to asphalt mixture rutting resistance. An emphasis was placed on evaluating polymer-modified asphalt binders with identical (or close) high-temperature performance grades (PG's), but varied polymer chemistries. Eleven asphalt binders were obtained for this study: two unmodified asphalt binders, an air-blown asphalt binder, and eight polymer-modified asphalt binders. High-temperature asphalt binder properties were measured by a dynamic shear rheometer (DSR). Mixture rutting resistance was measured by repeated shear at constant height (RSCH), and the French Pavement Rutting Tester (French PRT). The first objective was to verify the findings of a previous study using a different aggregate. In the previous study, it was found that the Superpave high-temperature asphalt binder properties correlated to mixture rutting resistance with few outliers, and a change in high-temperature PG from 70 to 76 increased rutting resistance. However, the correlation between RSCH and asphalt binder G*/sind (delta) depended on DSR frequency. The data suggested that a low DSR frequency, such as 0.1 rad/s, might provide a better grading system than the standard DSR frequency of 10.0 rad/s. This would require a change in the current asphalt binder specification. A diabase aggregate was used in a previous study. The data using a second aggregate, a limestone aggregate, in combination with four of the asphalt binders, agreed with the findings from the diabase mixtures. The second objective was to retest the diabase mixtures at 70 degrees Celsius using RSCH. The test temperatures used in the previous study were 50 degrees Celsius for RSCH and 70 degrees Celsius for the French PRT. The polymer-modified asphalt binders had continuous high-temperature PG's ranging from 71 to 77. Therefore, it was recommended that the test temperature for RSCH be increased to 70 degrees Celsius. Again, the correlation between RSCH and G*/sind was dependent on DSR frequency. The data suggested that a low DSR frequency, such as 0.1 rad/s, might provide a better grading system. However, it is not known whether this finding applies to pavements, or is related to the accelerated nature of the RSCH test. Furthermore, G*/sind (delta) at 0.1 rad/s did not clearly provide a better correlation to RSCH than the high-temperature PG's of the asphalt binders. The degree of correlation between the French PRT and G*/sind at 70 degrees Celsius did not depend on DSR frequency, and there was only one outlier. A correlation between the French PRT and high-temperature PG provided no obvious outliers. No changes to the specification are recommended based on the French PRT results.
Characterization of Modified Asphalt Binders in Superpave Mix Design
Author: Rheological and Rutting Characterization of Asphalt Mixes with Modified Binders
Author: S. Anjan kumarPublisher:
ISBN:
Category : Aging
Languages : en
Pages : 12
Book Description
This paper presents the results of investigations on the rheological properties of modified asphalt binders and their influence on the performance of asphalt mixes. Asphalt mixes with modified binders such as styrene butadiene styrene polymer, crumb rubber, natural rubber, and waste plastics were evaluated for their rheological properties and compared to the properties of asphalt mixes with unmodified VG30 (viscosity grade) asphalt binder. The dynamic modulus values and rutting characteristics of the asphalt mixes were studied with due consideration to different levels of aging and temperature variations. Studies on the rheological properties showed that the energy dissipated by unmodified asphalt (VG30) binder is higher than that of modified asphalt binders. Long-term aged natural rubber and waste plastic modified asphalt binders showed significant increase in the properties compared to unmodified asphalt binder (VG30). Reduced temperature susceptibility of polymer modified asphalt binder showed that only polymer modification can enhance both high temperature rutting resistance and low temperature thermal cracking resistance of asphalt mixes. The transient nature of polymer modified asphalt mix from viscoelastic solid-like to viscoelastic fluid-like condition is significantly shifted to higher temperature compared to that of the mix with unmodified asphalt binder. Aging and rutting indices showed that rubber modified asphalt mixes are highly susceptible to aging. Statistical analysis of test results showed that the process of modification of asphalt binder, aging, and temperature during the test influence the rheological and rutting characteristics of asphalt mixes significantly. Correlation between the asphalt binder properties and its influence on the rutting resistance are found to be statistically significant. The analysis using least significant difference showed that polymer modified asphalt binder significantly improves the aging and rutting resistance of asphalt mixes compared to unmodified asphalt binder.
Characterization of Modified Asphalt Binders in Superpave Mix Design
Author: Characterization of Modified Asphalt Binders in Superpave Mix Design
Author: Hussain U. BahiaPublisher:
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 180
Book Description
Mechanical Tests for Bituminous Mixes - Characterization, Design and Quality Control
Author: E. EustacchioPublisher: CRC Press
ISBN: 0203626990
Category : Architecture
Languages : en
Pages : 648
Book Description
This book forms the Proceedings of an International RILEM Symposium, the fourth in the series, on Testing of Bituminous Mixes in Budapest, Hungary, October 1990. The aim of the Symposium is to promote tests for the characterization, design and quality control of bituminous mixes which combine the best features of traditional and modern approaches. Among the topics covered are specimen preparation, tests with unique loading (Marshall test, uniaxial tension and creep tests etc), which are used for mix design or control of mechanical properties, and tests with repeated loading, which give information on fatigue, permanent deformation and moduli, especially for mix design.
Advanced Testing and Characterization of Bituminous Materials, Two Volume Set
Author: Andreas LoizosPublisher: CRC Press
ISBN: 0203092988
Category : Technology & Engineering
Languages : en
Pages : 1318
Book Description
Bituminous materials are used to build durable roads that sustain diverse environmental conditions. However, due to their complexity and a global shortage of these materials, their design and technical development present several challenges. Advanced Testing and Characterisation of Bituminous Materials focuses on fundamental and performance testing