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Effects Of Additives For Warm Mix Asphalt On Performance Grades Of Asphalt Binders
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Book Synopsis Effects of Additives for Warm Mix Asphalt on Performance Grades of Asphalt Binders by : Chaofan Wu
Download or read book Effects of Additives for Warm Mix Asphalt on Performance Grades of Asphalt Binders written by Chaofan Wu and published by . This book was released on 2012 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: Laboratory tests were carried out on a neat asphalt binder and a styrene-butadiene-styrene (SBS) asphalt binder containing Sasobit and Aspha-min as warm mix asphalt (WMA) additives to quantitatively evaluate the effects of the additives on the continuous grading temperatures and grades of asphalt binders in the framework of the performance grading system. Test results and data analyses indicate that the significances of the effects of WMA additives depend on the asphalt binder type, additive type, additive content, and rolling thin film oven (RTFO) aging temperature. The wax-type additive Sasobit has a stiffening effect on the grading temperatures. At typical 3 % content, the upper temperatures can be increased by up to 13.5 °C, the lower temperatures can be increased by up to 6.9 °C, and the intermediate temperatures can be increased by up to 5.0 °C. In the commonly used content range, the zeolite-type additive Aspha-min has little effects on the upper, lower, and intermediate grading temperatures. Although there is a special case, in which the upper grading temperature increase is canceled out by 3.8 °C, the reduction in RTFO aging temperature from 163 °C to 133 °C does not generally result in notable changes in the grading temperatures.
Book Synopsis Asphalt Pavements by : Patrick Lavin
Download or read book Asphalt Pavements written by Patrick Lavin and published by CRC Press. This book was released on 2003-09-02 with total page 463 pages. Available in PDF, EPUB and Kindle. Book excerpt: Asphalt Pavements provides the know-how behind the design, production and maintenance of asphalt pavements and parking lots. Incorporating the latest technology, this book is the first to focus primarily on the design, production and maintenance of low-volume roads and parking areas.Special attention is given to determining the traffic capacity, re
Book Synopsis Laboratory Characterization of Asphalt Binders Containing a Chemical-Based Warm Mix Asphalt Additive by : Shivani Rani
Download or read book Laboratory Characterization of Asphalt Binders Containing a Chemical-Based Warm Mix Asphalt Additive written by Shivani Rani and published by . This book was released on 2020 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt: Different technologies, namely foamed asphalt, synthetic waxes, zeolites, and chemical additives, are used to produce warm mix asphalt (WMA). This study was undertaken to evaluate the effect of using different amounts of an amine-based chemical WMA additive on the rheology, performance grade (PG), and moisture-induced damage potential of an asphalt binder (PG 58-28). Superpave specifications were used to evaluate the rheological properties and PG of the asphalt binder. Also, a mechanistic approach-based on the surface free energy (SFE) method was used to evaluate the moisture-induced damage potential of the asphalt binder combined with commonly used aggregates in an asphalt mix. It was found that the dynamic viscosity of the asphalt binder was not significantly affected after blending it with the WMA additive. It was also observed that the Superpave high-temperature PG and the rutting factor did not reduce by an increase in the WMA additive content. However, the continuous low-temperature PG of the asphalt binder decreased with an increase in the amount of WMA additive. Furthermore, it was found that the fatigue resistance increased after blending the binder with the WMA additive. The SFE results of the asphalt binder revealed that the WMA additive used in this study reduced the moisture-induced damage potential of the asphalt mixes. However, the extent of this improvement was found to largely depend on the aggregate type. The outcomes of this study are expected to help better understand the influence of amine-based chemical WMA additives on rheological and long-term performance of asphalt mix.
Book Synopsis Mechanical Properties of Warm Mix Asphalt Prepared Using Foamed Asphalt Binders by : Ala R. Abbas
Download or read book Mechanical Properties of Warm Mix Asphalt Prepared Using Foamed Asphalt Binders written by Ala R. Abbas and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Hot mix asphalt (HMA) is a mixture containing aggregates and asphalt binders prepared at specified proportions. The aggregates and asphalt binder proportions are determined through a mix design procedure such as the Marshall Mix Design or the Superpave Mix Design methods. Overall, the goal of determining such proportions is to establish an HMA mixture that will meet specific performance criteria. In addition, it is imperative to ensure that the asphalt binder will fully coat the aggregates and that the resulting mixture is workable and compactable. In order to ensure sufficient aggregate drying and coating, both the asphalt binder and the aggregates are heated to elevated temperatures ranging between 300oF and 325oF. The use of such high temperatures would result in lowering the viscosity of the asphalt binder which is the main factor affecting the coating and workability of asphalt mixtures. In recent years, a new group of technologies have been introduced to the United States that allow producing asphalt mixtures at temperatures 30 to 100oF lower than what is used in HMA. This group of technologies is commonly referred to as Warm Mix Asphalt (WMA). They are promoted as environmentally friendly green alternatives to HMA mixtures as they produce lower greenhouse gas emissions. This new group of technologies aims at reducing the viscosity of the asphalt binder through the addition of organic or chemical additives or by introducing cool water into the heated molten asphalt under controlled temperature and pressure conditions, resulting in so-called foamed asphalt binder. As a consequence, lower temperatures are needed during production for the asphalt binder to be absorbed by the aggregates.
Book Synopsis Characteristics of Asphalt Binders by :
Download or read book Characteristics of Asphalt Binders written by and published by . This book was released on 1996 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis High-Temperature Viscosity Performance of Crumb-Rubber-Modified Binder With Warm Mix Asphalt Additives by : Hainian Wang
Download or read book High-Temperature Viscosity Performance of Crumb-Rubber-Modified Binder With Warm Mix Asphalt Additives written by Hainian Wang and published by . This book was released on 2012 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: The application of crumb-rubber modifier (CRM) in asphalt mixtures has been proven to increase the viscosity of CRM binders. In recent years, warm mix asphalt (WMA) additives have been employed to CRM binders to lower their viscosity at high temperatures, allowing a decrease in the mixing and compaction temperatures. The objective of this research is to investigate the viscosity and storage stability of rubberized WMA binders with different tire rubber concentrations and WMA additives. The tire rubber of 40-mesh, with concentrations of 10 %, 15 %, 20 %, and 25 % by weight of a Superpave performance grade (PG) 64-22 asphalt binder, were used in this study along with the WMA additives, such as Sasobit, RH and Advera. Viscosity tests were conducted on the rubberized WMA binders using the rotational viscometer at four temperatures (135, 160, 177, and 190°C). The statistical analysis of variance (ANOVA) was applied to quantify the respective effects of the influencing factors on the CRM binder's viscosity. The test results indicated that the addition of crumb rubber could greatly increase the viscosity of asphalt binders, which could be improved continuously at increased crumb-rubber concentrations. However, when considering different WMA additives, the crumb rubber showed different effects on the viscosity of the binder. The three WMA additives could all reduce the viscosity of the CRM binder; in addition, RH had the most significant effect on viscosity reduction. It was also found that the CRM binders with WMA additives had good storage stability. For example, the viscosity of the CRM binder with 10 % rubber concentration and RH only increased by 3.8 % after being stored for 4.5 h.
Book Synopsis Evaluation of Warm Mix Additives for Use in Modified Asphalt Mixtures by : Corina Borroel Wong
Download or read book Evaluation of Warm Mix Additives for Use in Modified Asphalt Mixtures written by Corina Borroel Wong and published by . This book was released on 2011 with total page 264 pages. Available in PDF, EPUB and Kindle. Book excerpt: The intention of this research effort is to evaluate the use of warm mix additives with typical polymer-modified and terminal blend tire rubber asphalt mixtures from Nevada and California. The research effort is broken into three phases that are intended to evaluate the impacts of warm mix additives with typical polymer-modified and terminal blend tire rubber asphalt mixtures from Nevada and California: moisture damage, performance characteristics, and mechanistic analysis. In Phase I of this research effort, mixture resistance to moisture damage was evaluated using the indirect tensile test and the dynamic modulus at multiple freeze-thaw cycles. Laboratory testing was conducted to address the following: (1) the impact of warm mix additive and reduced production temperatures on the moisture damage resistance of asphalt mixtures, (2) the impact of residual aggregate moisture on the moisture damage resistance of WMA mixtures, (3) the impact of warm mix additives on the moisture damage resistance of anti-strip treated WMA mixtures, and (3) the impact of long-term aging on strength gain and the moisture damage resistance of WMA mixtures. A total of one aggregate source, four warm mix asphalt technologies (Advera, Sasobit, Revix and Foaming) and three asphalt binder types (neat, polymer-modified and terminal blend tire rubber modified asphalt binders) typically used in both Nevada and California are being evaluated in this study. This thesis will only summarize the test results and findings of the Phase I of the study for two warm-mix additives: Advera and Sasobit. The evaluation of the other two technologies (i.e. Revix and Foaming) as well as the Phase II testing are still in progress and have not been completed.
Book Synopsis Superpave Mix Design by : Asphalt Institute
Download or read book Superpave Mix Design written by Asphalt Institute and published by . This book was released on 2001-01-01 with total page 102 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Hot-mix Asphalt Mixtures written by and published by . This book was released on 1999 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Quantifying the Impacts of Warm Mix Asphalt on Constructability and Performance by :
Download or read book Quantifying the Impacts of Warm Mix Asphalt on Constructability and Performance written by and published by . This book was released on 2012 with total page 500 pages. Available in PDF, EPUB and Kindle. Book excerpt: Joint efforts by the federal government and HMA industry to minimize cost and the environmental impacts of asphalt pavement construction have resulted in development of warm mix asphalt (WMA). This technology has gained such interest due to the potential to deliver pavements at lower temperatures, allowing for reduced energy consumption and emissions. In order to be effective WMA must meet the specified values of in-place density at reduced temperatures during construction and demonstrate sufficient resistance to pavement distresses while in-service. The overall objective of this research was to promote effective use of WMA through development of a procedure to recommend additive specific mixing and compaction temperature ranges that will provide adequate workability during construction, and an acceptable level of in-service performance. To pursue this objective an experiment was designed to evaluate the effects of various WMA technologies on the workability and performance properties of asphalt binders and mixtures using existing standards and new test methods developed during the study. The new test methods were pursued to better define the role of asphalt binder as a lubricant during compaction and to properly account for the effects of reduced production temperatures on asphalt binder performance and potential for moisture damage. Results found that use of WMA impacts both construction and performance properties. To account for these factors an evaluation framework to select appropriate production temperatures for WMA was introduced that is based on evaluation of mixture volumetrics, compactability, resistance to moisture damage, and rutting performance. Furthermore, to facilitate the mixture design and temperature selection process surrogate test methods to evaluate workability and performance properties of the asphalt binder as well as the integrity of the bond at the asphalt/binder aggregate interface were proposed and verified through relationships with mixture performance.
Book Synopsis The Effects of Liquid Anti-stripping Additives on the Performance of Asphalt Binder in Hot Mix Asphalt by : Kathryn Page Copeland
Download or read book The Effects of Liquid Anti-stripping Additives on the Performance of Asphalt Binder in Hot Mix Asphalt written by Kathryn Page Copeland and published by . This book was released on 2005 with total page 172 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Binder Rheology and Performance in Warm Mix Asphalt by : Zelalem Arega
Download or read book Binder Rheology and Performance in Warm Mix Asphalt written by Zelalem Arega and published by . This book was released on 2012 with total page 39 pages. Available in PDF, EPUB and Kindle. Book excerpt: Since the introduction of warm mix asphalt (WMA) in the United States, a variety of different technologies and processes have been developed and used to achieve proper mixing and compaction at reduced temperatures compared to conventional hot mix asphalt (HMA). A better understanding of the effect of WMA additives and reduced aging on the rheology of asphalt binders is a crucial step towards the successful implementation of WMA. This report presents the findings from a study conducted to investigate the influence of chemical WMA additives and reduced short-term aging on the properties of asphalt binders, mortars, and mixtures. This report presents the details of the test methods and findings relevant to mortars and mixtures prepared using warm mix additives.
Book Synopsis Binder Characterization and Evaluation: Test methods by :
Download or read book Binder Characterization and Evaluation: Test methods written by and published by . This book was released on 1994 with total page 220 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Performance Evaluation of Warm-Mix Recycled Asphalt Binders After Long-Term Aging by : Qiang Li
Download or read book Performance Evaluation of Warm-Mix Recycled Asphalt Binders After Long-Term Aging written by Qiang Li and published by . This book was released on 2019 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study evaluates the pavement performance evolution of warm-mix recycled asphalt binders during the secondary service period. Warm-mix recycled asphalt binders with various long-term aging levels and recycling plans were produced by the laboratory simulation method. Conventional physical properties tests, the dynamic shear rheometer test, and the bending beam rheometer test were conducted to measure the performance of recycled binders. Effects of the aging level and recycling plan on the resistance to rutting, fatigue cracking, and low temperature cracking were investigated by statistical methods. It was found that after secondary long-term aging, recycled binders are more resistant to rutting, while they are less resistant to fatigue and low temperature cracking. The modified aging kinetic model can be used to accurately characterize the effect of secondary aging time on rutting or fatigue factors for recycled binders. The resistance of aged binders to fatigue and low temperature cracking is obviously improved by adding the warm mix asphalt additive. By comparison, using styrene butadiene rubber latex enhances the binder performance in almost all aspects. The aging level has a more significant effect than the recycling plan for all performance parameters.
Book Synopsis A Manual for Design of Hot Mix Asphalt with Commentary by :
Download or read book A Manual for Design of Hot Mix Asphalt with Commentary written by and published by Transportation Research Board. This book was released on 2011 with total page 285 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Introduction to Unmanned Aircraft Systems, Second Edition by : Douglas M. Marshall
Download or read book Introduction to Unmanned Aircraft Systems, Second Edition written by Douglas M. Marshall and published by CRC Press. This book was released on 2015-10-26 with total page 1944 pages. Available in PDF, EPUB and Kindle. Book excerpt: The proliferation of technological capability, miniaturization, and demand for aerial intelligence is pushing unmanned aerial systems (UAS) into the realm of a multi-billion dollar industry. This book surveys the UAS landscape from history to future applications. It discusses commercial applications, integration into the national airspace system (NAS), System function, operational procedures, safety concerns, and a host of other relevant topics. The book is dynamic and well-illustrated with separate sections for terminology and web- based resources for further information.
Book Synopsis Effects of Warm-mix Asphalt Additives on Asphalt Mixture Characteristics and Pavement Performance by : Jun Zhang (Of Texas A & M Transportation Institute)
Download or read book Effects of Warm-mix Asphalt Additives on Asphalt Mixture Characteristics and Pavement Performance written by Jun Zhang (Of Texas A & M Transportation Institute) and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
