Evaluation Of Asphalt Concrete Containing Sbs And Sbr Modified Binder
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Evaluation Of Asphalt Concrete Containing Sbs And Sbr Modified Binder
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Author : Donald W. Christensen
language : en
Publisher:
Release Date : 1998
Evaluation Of Asphalt Concrete Containing Sbs And Sbr Modified Binder written by Donald W. Christensen and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1998 with categories.
Pavement Performance Testing
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Author : Shad M. Sargand
language : en
Publisher:
Release Date : 2001
Pavement Performance Testing written by Shad M. Sargand and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001 with Pavements categories.
The objectives of this study were to evaluate the effects of aggregate gradation and polymer modification on rutting and fatigue resistance of Superpave mixes. Asphalt mixes were prepared using three different gradations (above, through, and below the restricted zone) and three PG 70-22 binders (unmodified, SBS and SBR modified), and were evaluated using a triaxial repeated load test, a static creep, the Asphalt Pavement Analyzer, and the flexural beam fatigue test. When aggregates meeting Superpave angularity requirements was used, the effects of gradation on the rut and fatigue resistance of Superpave mixes were relatively small and the effects of the restricted zone was not significant. Even though binders used in this study had similar dynamic shear moduli, mixes containing polymer modified binders showed significantly lower resilient moduli than the unmodified mixes when measured in the indirect tensile and triaxial compressive modes. All laboratory test results indicated that the polymer modified mixes were significantly more rut resistant and fatigue resistant than the unmodified mixes with the same PG grading. Improvement in rut resistance due to polymer modification was shown to be most significant in the triaxial repeated load test, especially at a higher-temperature. Accelerated Pavement Load test results showed the similar trends regarding rutting performance. At higher test temperature or at a fast wheel speed, mixes with polymer modified binder performed better than mixes with an unmodified binder.
Durability And Performance Characteristics Of Hot Mix Asphalt Containing Polymer Additives
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Author : Robert Y. Liang
language : en
Publisher:
Release Date : 2001
Durability And Performance Characteristics Of Hot Mix Asphalt Containing Polymer Additives written by Robert Y. Liang and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001 with Pavements, Asphalt concrete categories.
Ohio Department of Transportation has adopted the hot mix asphalt concrete containing polymer modifiers for use in the interstate highway pavement. Among the various reasons cited for the adoption of polymer modifiers are the favorable field experiences by ODOT, extensive literatures reporting enhanced performance, such as rutting resistance, low temperature thermal cracking resistance, and possibly fatigue endurance. However, despite these favorable findings, there are still cases involving premature failure of hot mixtures containing polymer modifiers. Concerns regarding optimum polymer content, compatibility between polymer additives and asphalt cement, proper mixing and compaction procedure remain to be resolved. Furthermore, performance based specifications to ensure production of desirable final asphalt concrete product require additional development. Questions regarding the suitability of Superpave binder testing procedures for the polymer-modified binders need to be clarified.
Characterization And Implementation Of Ground Tire Rubber As Post Consumer Polymers For Asphalt Concrete
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Author : Gaylon L. Baumgardner
language : en
Publisher:
Release Date : 2015
Characterization And Implementation Of Ground Tire Rubber As Post Consumer Polymers For Asphalt Concrete written by Gaylon L. Baumgardner and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with categories.
Asphalt binder modification is a common method of improving Hot-mix Asphalt (HMA) performance by enhancing mix properties and reducing or delaying three general HMA distress types: deformation (rutting and shoving), cracking (from repeated loads and low temperatures) and general deterioration (raveling and stripping). Since the early 1960’s, a common modified asphalt alternative has employed reclaimed rubber as an economical and environmental friendly method of recycling waste tires while improving asphalt physical and mechanical properties. Pavement network deterioration combined with increasing material costs makes polymer modification of asphalt binder desirable, with reclaimed rubber from waste tires being an attractive alternative which addresses performance, economics and environmental issues. The primary objective of this dissertation is to demonstrate the importance of proper processing of all types of modified bituminous binders, whether they be virgin (e.g. styrene-butadiene-styrene (SBS) or styrene-butadiene rubber (SBR)), post-consumer polymers (e.g. ground tire rubber (GTR)) or a combination (GTR plus SBS). To achieve this four secondary objectives were identified: 1) characterize GTR using thermo-gravimetric analysis (TGA), 2) improve processing of GTR modified binders, 3) improve testing and specifications of GTR modified binders and 4) evaluate mixes containing GTR modified binders. A simple efficient instrumental, TGA, method to analyze polymers in binary rubber compounds was developed to quantify the functional polymer content available in GTR. TGA analysis provides a better understanding of the general chemical characteristics of GTR used in modification of asphalt binders for production of asphalt paving mixtures. Results are presented from efforts to optimize GTR modified binder formulations with respect to how GTR loading, GTR particle size, processing temperature and asphalt cement source affect modified binder properties and ability to meet performance graded binder specifications. These results are the basis to establish recommended processing parameters for formulation and preparation of GTR modified asphalt binders. GTR modified binders were used in: dense graded asphalt (DGA), stone matrix asphalt (SMA) and open graded friction courses (OGFC) and compared to conventional asphalt cement and styrene-butadiene-styrene (SBS) modified asphalt binders. Mixture performance evaluation with respect to binder effectiveness as it relates to the three general HMA distress types.
Performance Evaluation Of Asphalt Concrete Mixtures Containing Unmodified And Crumb Rubber Modified Asphalt Binders
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Author : Gajanan Suresh Natu
language : en
Publisher:
Release Date : 1998
Performance Evaluation Of Asphalt Concrete Mixtures Containing Unmodified And Crumb Rubber Modified Asphalt Binders written by Gajanan Suresh Natu and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1998 with Asphalt concrete categories.
Beneficial Effects Of Selected Additives On Asphalt Cement Mixes
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Author : D. Y. Lee
language : en
Publisher:
Release Date : 1987
Beneficial Effects Of Selected Additives On Asphalt Cement Mixes written by D. Y. Lee and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1987 with Asphalt cement categories.
Effects of polyolefins, neoprene, styrene-butadiene-styrene (SBS) block copolymers, styrene-butadiene rubber (SBR) latex, and hydrated lime on two asphalt cements were evaluated. Physical and chemical tests were performed on a total of 16 binder blends. Asphalt concrete mixes were prepared and tested with these modified binders and two aggregates (crushed limestone and gravel), each at three asphalt content levels. Properties evaluated on the modified binders (original and thin-film oven aged) included: viscosity at 25 deg C, 60 deg C and 135 deg C with capillary tube and cone-plate viscometer, penetration at 5 deg C and 25 deg C, softening point, force ductility, and elastic recovery at 10 deg C, dropping ball test, tensile strength, and toughness and tenacity tests at 25 deg C. From these the penetration index, the viscosity-temperature susceptibility, the penetration-viscosity number, the critical low-temperature, long loading-time stiffness, and the cracking temperature were calculated. In addition, the binders were studied with x-ray diffraction, reflected fluorescence microscopy, and high-performance liquid chromatography techniques. Engineering properties evaluated on the 72 asphalt concrete mixes containing additives included: Marshall stability and flow, Marshall stiffness, voids properties, resilient modulus, indirect tensile strength, permanent deformation (creep), and effects of moisture by vacuum-saturation and Lottman treatments. Pavement sections of varied asphalt concrete thicknesses and containing different additives were compared to control mixes in terms of structural responses and pavement lives for different subgrades. Although all of the additives tested improved at least one aspect of the binder/mixture properties, no additive was found to improve all the relevant binder/mixture properties at the same time. On the basis of overall considerations, the optimum beneficial effects can be expected when the additives are used in conjunction with softer grade asphalts.
Evaluation Of Modified Asphalt Binders
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Author : Ronald E. Reese
language : en
Publisher:
Release Date : 1989
Evaluation Of Modified Asphalt Binders written by Ronald E. Reese and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1989 with Binders (Materials) categories.
Optical Methods For The Evaluation Of Asphalt Concrete And Polymer Modified Bituminous Binders
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Author : Kirsten Eriksen
language : en
Publisher:
Release Date : 1993
Optical Methods For The Evaluation Of Asphalt Concrete And Polymer Modified Bituminous Binders written by Kirsten Eriksen and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1993 with Pavements, Asphalt concrete categories.
Evaluation Of Hybrid Binder For Dense And Open Graded Asphalt Mixtures
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Author : Weitao Li
language : en
Publisher:
Release Date : 2009
Evaluation Of Hybrid Binder For Dense And Open Graded Asphalt Mixtures written by Weitao Li and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009 with categories.
ABSTRACT: Binder and mixture tests were performed to evaluate the relative performance of a PG 67-22 base binder and six other commercially available binders produced by modifying the same base binder with the following modifiers: one Styrene Butadiene Styrene (SBS) polymer, three commercially available hybrid binders composed of different percentages of rubber and SBS polymer, and two asphalt rubber binders (5% and 12 % rubber: ARB-5 and ARB-12). Results indicated that hybrid binders (modified with more rubber than SBS) that exceed the cracking performance characteristics of unmodified binder and asphalt rubber binders, and have about the same cracking performance characteristics of SBS polymer modified binder can be produced commercially. Results also indicated that hybrid binder can be suitably specified using existing specification requirements for PG76-22 binder and solubility. Therefore, it appears that hybrid binder has the potential to replace three binders currently used by FDOT in hot mix asphalt: SBS polymer modified asphalt, ARB-5, and ARB-12. It was recommended that FDOT develop a transition plan to accomplish this. The research also showed that existing binder tests do not accurately predict cracking performance at intermediate temperatures, even in a relative sense. A further Healing testing was performed on the dense-graded granite mixtures to evaluate the healing potential of hybrid binders compared to base binders. Different testing procedures were carried out and analyzed to give a better understanding of healing mechanisms. Results from healing test agreed with those from cracking performance evaluation. However, more healing parameters and procedure need to be fully developed to capture healing characteristics more specifically. It was recommended that FDOT pursue development and evaluation of the healing test.
Rheological Evaluation Of Asphalt Binders Modified With Solid Additives
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Author : Andres Rangel
language : en
Publisher:
Release Date : 1998
Rheological Evaluation Of Asphalt Binders Modified With Solid Additives written by Andres Rangel and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1998 with categories.