Download or read book Performance Evaluation of Polyphosphoric Acid Modified Asphalt Binders written by Istiaque Mahmud and published by . This book was released on 2016 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Evaluation of Recycled Waste Plastics as Modifiers for Performance graded Asphalt Binders written by Paul Osei and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The use of recycled plastics in asphalt has gained more attention in the last few years. The objective of this study is to evaluate the performance of asphalt binders that have been modified using recycled polyethylene-based plastic pellets (RPE) using the Superpave Performance Grading and the Multiple Stress Creep and Recovery (MSCR) Tests. The study will also focus on the influence of the chemical modifiers Elvaloy and Polyphosphoric Acid (PPA) on the performance of the RPE-modified binders. Two different types of RPE pellets were blended in a PG 58-28 base binder during this study. Eight (8) different modified blends were developed, four (4) of which were blended with only RPE pellets and the other four (4) included the RPE, Elvaloy, and PPA modifiers. The dosages of the RPE pellets were 2% and 4% by weight of the mix, while the Elvaloy and PPA had fixed dosages of 1% and 0.002% by weight of the mix. The study showed that the addition of the RPE to the asphalt binders improved the high-temperature performance of the binders. The 2% dosage of the RPE led to a high temperature-grade increment of the binder (from PG-58 to PG-64) while the 4% dosage led to the increment of the high-temperature grade by 2-levels (PG-58 to PG-70). The presence of the Elvaloy and PPA also affected the performance of the binder in very similar ways as compared to the RPE only. The RPE, Elvaloy and PPA modified binders showed marginally better rutting resistance than the binder with RPE only. The fatigue resistance of the modified binders was also improved after the modification process. The low-temperature performance of the modified binders was minimally affected after the modification process. The modified binders showed increased stiffnesses at low temperatures, however, the increase in stiffness was not sufficient enough to alter the low-temperature grades of the modified binders.

Download or read book Binder Characterization and Evaluation written by David A. Anderson and published by Strategic Highway Research Program (Shrp). This book was released on 1994 with total page 504 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Performance Evaluation of Modified Asphalt Binders written by and published by . This book was released on 2002 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt: In their quest to improve overall pavement performance and durability, pavement engineers in recent years developed and used innovative asphalt mixtures utilising engineered or modified asphalt binders. The technology of asphalt modification using refining processes has evolved in the past decade as a viable, effective alternative. Results of an extensive evaluation of several paving asphalt binders modified by refining processes are presented and discussed. The evaluation used testing and characterisation systems developed in the Strategic Highway Research Program (SHRP) and recent revisions of these systems as proposed in the NCHRP 9-10 project. Rheological, failure and ageing properties at temperatures that simulate pavement service were measured and analysed. Handling, constructability and performance characteristics of asphalt binders modified by refining processes are evaluated and compared with those of conventional materials and asphalt modified by different types of polymers. Comparative performance results on asphalt mixtures are presented to show the effect of the improvements in binder characteristics on mixture performance. Results on new binder test methods developed as part of NCHRP 9-10 are also presented comparing binder and mixture performance characteristics. For the covering abstract of this conference see ITRD number E211271.

Download or read book Long term Performance Evaluation of Polymer modified Asphalt Concrete Pavements written by William E. Elmore and published by . This book was released on 1993 with total page 195 pages. Available in PDF, EPUB and Kindle. Book excerpt: Following the five-year study performed to investigate the behavior of binders and asphalt mixtures containing polymer modifiers, it was determined that an insufficient amount of time had elapsed to allow any determinations to be made based upon the special field test sections. The study reported herein was to extend that initial time and to study in depth those special test sections, using visual observations coupled with resulting tests performed on samples extracted from the sections and comparisons with the original data developed in the original research. The research includes laboratory testing of field samples, determining the aging effect on the control and modified binders and corresponding effect on the mixtures, and visual evaluations. Retained samples of the original asphalts were also evaluated for potential performance as determined by the performance-based asphalt binder specification developed by the Strategic Highway Research Program. Four hot mix pavement field projects were constructed in the Tyler, Lufkin, San Antonio, and Childress Districts (10, 11, 15, and 25, respectively), and two seal coat projects were placed in the Odessa and Bryan Districts (6 and 17).

Download or read book Performance Evaluation of Asphalt Concrete Mixtures Containing Unmodified and Crumb Rubber Modified Asphalt Binders written by Gajanan Suresh Natu and published by . This book was released on 1998 with total page 338 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Use and Performance of Asphalt Binder Modified with Polyphosphoric Acid PPA written by United States. Federal Highway Administration. Office of Pavement Technology and published by . This book was released on 2012 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt: This Technical Brief provides an overview of the implication of the use of Polyphosphoric Acid as a modifier for asphalt binders and implications in relation to asphalt pavement performance.

Download or read book Evaluation of New SHRP Performance related Tests for Asphalt Binders and Modified Asphalt Binders Used in Florida written by Patrick Bryan Upshaw and published by . This book was released on 1994 with total page 332 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Proceedings of STCCE 2021 written by Nikolai Vatin and published by Springer Nature. This book was released on 2021-06-28 with total page 394 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book gathers selected contributions in the field of civil and construction engineering, as presented by international researchers and engineers at the 2nd International Scientific Conference on Socio-Technical Construction and Civil Engineering (STCCE), held in Kazan, Russia on April 21-28 2021. The book covers a wide range of topics including building constructions and structures, bridges, roads and tunnels, building materials and products, construction management, energy efficiency and thermal protection of buildings, ventilation, air conditioning, gas supply and lighting in buildings, innovative and smart technologies in construction, sustainable development, transport system development. The contributions, which were selected by means of a rigorous international peer-review process, highlight numerous exciting ideas that will spur novel research directions and foster multidisciplinary collaborations.

Download or read book Modified Asphalt written by Jose Luis Rivera Armenta and published by BoD – Books on Demand. This book was released on 2018-09-19 with total page 142 pages. Available in PDF, EPUB and Kindle. Book excerpt: Asphalt modification is an important area in the development of new road and pavement materials. There is an urgent demand for road materials that can minimize fracture at low temperatures and increase resistance to deformation at high temperatures. The function of asphalt is to bind aggregate to protect it from water and other harmful agents. In the beginning asphalt was ideal for this purpose, but recently traffic loads have increased and environmental factors have deteriorated more rapidly than before. Asphalt is a byproduct of crude oil in the refining process, and it is considered a complex heterogeneous mixture of hydrocarbons. Asphalt modification has become an important research area, using several methods and new materials as modifiers.

Download or read book Polyphosphoric Acid Modification of Asphalt written by Asphalt Institute and published by . This book was released on 2001-01-01 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Development and Application of Bituminous Materials for Civil Infrastructures written by Hui Yao and published by Frontiers Media SA. This book was released on 2021-10-22 with total page 214 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Proceedings of CEE 2019 written by Zinoviy Blikharskyy and published by Springer. This book was released on 2019-08-08 with total page 577 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book gathers the latest advances, innovations, and applications in the field of effective methods of calculation, resource-saving technologies and advanced materials in civil and environmental engineering, as presented by leading international researchers and engineers at the XVII International Scientific Conference Current Issues of Civil and Environmental Engineering “Lviv- Košice – Rzeszów”, held in Lviv, Ukraine on September 11-13, 2019. It covers highly diverse topics, including structural shaping and optimization; aspects of structural behavior and modeling; advanced analysis methods; experimental tests and numerical simulations; design codes, in particular Eurocodes and other national and regional limit state codes; and highway and bridges engineering. It also discusses modern architectural and structural solutions; innovative materials and products; durability and maintenance; fabrication and erection; sustainability in construction; renewable energy sources; heat, gas and water supply; ventilation and air-conditioning; ecological and energy-saving technologies, modern water-purification and treatment technologies; and the protection of water ecosystems. The contributions, which were selected by means of a rigorous international peer-review process, highlight numerous exciting ideas that will spur novel research directions and foster multidisciplinary collaborations.

Download or read book Evaluation of Polymer Modified Asphalt in Hot Mix Pavements written by Charles Ifft and published by . This book was released on 1989 with total page 310 pages. Available in PDF, EPUB and Kindle. Book excerpt: Polymer modified asphalts have recently been the focus of much attention in the U.S. due to claims that polymer additives will lengthen the life of an asphalt pavement. Much of the published research on this topic has been concentrated on the effects of polymer modifiers on binder and mixture properties. The goal of this testing is to predict from laboratory testing the actual field performance of an asphalt concrete. Over the years, specifications have been developed for conventional asphalts that allow pavement performance to be predicted from certain binder tests. These conventional binder tests do not fully address the special characteristics of polymer modified asphalt binders and need revision to be an effective tool in predicting pavement service life. This paper presents the findings of a two-part laboratory research program intended to relate binder and mixture properties of polymer modified asphalts. The preliminary testing involved five asphalt binder types and a variety of binder and mixture tests. Promising test procedures were further investigated in the final testing program where ten asphalt binders were examined. Simple linear regression was used to determine the strength of a relationship between pairs of binder properties and mixture properties. The preliminary testing showed penetration, toughness and tenacity, and force ductility to have the most promise in predicting mixture performance. The final testing contained enough data to be analyzed with both simple linear regression and multiple regression. Penetration, toughness and tenacity, force ductility again were the test procedures that had binder properties that correlated well with mixture properties.

Download or read book Understanding the Performance of Modified Asphalt Binders in Mixtures written by Kevin D. Stuart and published by . This book was released on 2000 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The effect of 11 asphalt binders on the moisture sensitivity of a mixture were measured using the Hamburg Wheel- Tracking Device (Hamburg WTD). The Hamburg WTD tests a slab of hot- mix asphalt submerged in hot water by rolling a steel wheel across its surface. The binders consisted of two unmodified asphalt binders, an air- blown asphalt binder, and eight polymer- modified asphalt binders. The continuous high- temperature performance grades (PG's) ranged from 67 to 77. Two aggregates were used: diabase and limestone. The mixture results using the limestone aggegate could not be used to evaluate the asphalt binders because the Hamburg WTD crushed the limestone aggregate. A test temperature of 58 degrees Celcius was chosen for the diabase mixtures based on trial tests using the air- blown and unmodified PG 70- 22 asphalt binders. It was expected that most of the mixtures with polymer- modified asphalt binders would have greater resistance to moisture damage than the mixture with the unmodified PG 70- 22 asphalt binder because they would provide increased adhesion to the aggregate or create a network within the asphalt that was more resistant to water penetration. However, only one polymer- modified asphalt binder provided a greater resistance at a 5- percent level of significance. Some of the asphalt binders provided significantly different resistances to moisture damage that were not related to differences in cohesive strength as measured by the asphalt binder parameter G*/sin(delta) at 58 degrees Celcius. It was concluded that polymer- modified asphalt binders having the same G*/sin(delta) can provide different adhesive strengths and/or different resistances to water penetration. Reasons for these differences need to be determined.

Download or read book Laboratory and Field Performance Evaluation of Pavement Sections With High Polymer Modified Asphalt Overlays written by Jhony Habbouche and published by . This book was released on 2021 with total page 79 pages. Available in PDF, EPUB and Kindle. Book excerpt: In 2014, researchers at the Virginia Transportation Research Council initiated a study to evaluate the effectiveness of using high polymer-modified (HP) binders in surface asphalt concrete (AC) mixtures. The results were promising enough to support a field study investigating the use of HP binders in asphalt mixtures over jointed concrete pavement. Since 2015, HP AC overlays have been placed at several sections over existing jointed concrete pavement and cracked asphalt pavements in an effort to mitigate reflective cracking. The purpose of this study was to assess the viability of using HP AC mixtures in Virginia as a reflective crack mitigation technique or when deemed appropriate as a tool for increased crack resistance on higher volume facilities. Information on the state of the practice and lessons learned from the use of HP AC mixtures in the United States and Canada are also provided. In general, HP AC mixtures have been used in a wide range of applications under heavy traffic on interstates and slow-braking loads at intersections. No major field-related construction issues in terms of mixing temperatures and in-place compaction of HP AC mixtures were reported and standard construction practices and equipment were used. Good communication between the polymer/binder supplier and the contractor and solid planning prior to the work being conducted were important lessons learned with regard to paving with HP AC mixtures. The performance characteristics of conventional polymer-modified asphalt (PMA) and HP field-produced mixtures were evaluated in the laboratory in terms of durability and resistance to rutting and cracking. Based on the mixtures tested in this study, HP AC mixtures showed better performance when compared with PMA mixtures regardless of the mixture type (dense-graded surface mixtures and stone matrix asphalt [SMA]). Moreover, SMA mixtures showed better performance when compared with surface mixtures regardless of the asphalt binder type (PMA and HP). Overall, SMA-HP mixtures showed the most promising performance among all evaluated PMA and HP mixtures. Distress survey data collected from VDOT’s Pavement Management System of HP field sections were compiled, documented, and compared with that of their control PMA sections. The HP sections showed the most promising performance 5 years after construction (2015-2020) regardless of the traffic level and the pre-existing pavement conditions. In general, none of the evaluated mixtures (HP or PMA) was able to stop reflective cracking totally. Moreover, performance evaluations using the network-level pavement management data were conducted to estimate the life expectancy of HP AC overlays. Overall, PMA and HP AC overlays had an average predicted service life of 6.2 and 8.3 years, respectively, indicating a 34% extension of performance life of the AC overlays with HP modification. The study recommends continued assessment of the as-constructed properties in future HP projects for the purpose of compiling a materials characterization database. Further, the performance of all existing and future HP sections should be monitored. This will help in updating and revising the service life prediction models and the cost-effectiveness of using HP AC mixtures as the existing sections continue to age and more data are available. Finally, the use of the balanced mix design approach should be investigated to promote further the design of more durable and longer-lasting PMA and HP mixtures in Virginia.

Download or read book Detection of Polymer Modifiers in Asphalt Binder written by Stacey D. Diefenderfer and published by . This book was released on 2006 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study addressed the evaluation of alternative test methods to identify the presence of polymer modifiers in performance-graded binders for the purpose of quality assurance. A method of identification is presented in AASHTO T302, Polymer Content of Polymer-Modified Emulsions and Asphalt Binders, that uses Fourier transform infrared (FTIR) spectroscopy to evaluate the constituent elements in binders or emulsions. With proper calibration, output from FTIR can be used to determine the presence and approximate content of polymers in an asphalt binder. AASHTO T301, Elastic Recovery Test of Bituminous Materials by Means of a Ductilometer, offers an alternative method to determine the presence of polymer by evaluating the elasticity of the binder. Samples of binder were collected from contractor tanks and tested in accordance with AASHTO T301 and AASHTO T302. The performance grade was verified in accordance with AASHTO M320. Test results were evaluated to identify calibration needs, test variability, and choice of preferred methodologies for adoption into the quality assurance program. Results of the study identified the use of either FTIR analysis or elastic recovery as a timesaving alternative to full-fledged performance grading in the initial investigation of concerns about the presence of polymer. Both methods identified binders containing varying polymer contents with no instances of false positive identification. However, based on the results of this study, neither method is suitable to determine binder grade. The investigator recommends that the elastic recovery and FTIR analysis be incorporated as quality assurance tests to verify the presence of polymer in mixtures that specify the use of polymer-modified asphalt binders. Following this, the frequency of quality assurance sampling of polymer modified binders should be increased to ensure that inferior material is not being used in premium mixtures. Further, AASHTO T301 should be adopted in place of Virginia Test Method 104 for use with unaged binders. Incorporating the use of elastic recovery testing and FTIR spectroscopy as alternatives to performance grading will benefit VDOT by allowing increased quality assurance testing of premium asphalt mixtures. This will result in minimizing VDOT's risk of acceptance of inferior material and maximizing the benefits of using premium materials. Typically, performance grading is performed once per month on one binder sample from each active grade of binder in a VDOT district. This is estimated to result in testing less than 5% of the binder lots used in any district during a typical month. Although neither elastic recovery testing nor FTIR spectroscopy was shown conclusively to determine binder grade, almost all PG 76-22 binders shipped into Virginia contain polymer modifiers. Thus, the detection of the polymer is a first level indicator for quality assurance. The potential cost of these tests is approximately $200 per test for elastic recovery and approximately $120 per test for FTIR spectroscopy. Overall, the increased testing is expected to result in improved pavement quality by reducing the acceptance of inferior material.