Evaluation Of A Laboratory Accelerated Stripping Simulator For Hot Mix Asphalt Mixes

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Evaluation Of A Laboratory Accelerated Stripping Simulator For Hot Mix Asphalt Mixes

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Author :
language : en
Publisher:
Release Date : 2004

Evaluation Of A Laboratory Accelerated Stripping Simulator For Hot Mix Asphalt Mixes written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with categories.

Moisture susceptibility of hot mix asphalt (HMA) pavements continues to be a major pavement distress. Past research has primarily focused on HMA stripping prevention through material component evaluation/testing and addition of preventative additives. Stripping is caused by traffic, water, and high in-place service temperatures. Today, agencies use various methods to evaluate HMA moisture susceptibility with varying degrees of success. The study objective was to evaluate a prototype stripping simulator?s ability to predict HMA moisture susceptibility. The simulator evaluates moisture susceptibility by measuring conditioning water turbidity. Boil test and indirect tensile strength testing were also conducted for comparison purposes. Stripping simulator results indicate further refinement is required before it can be used for moisture susceptibility prediction.

Evaluation Of A Laboratory Accelerated Stripping Simulator For Hot Mix Asphalt Mixes

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Author : Vernon Morgan Moore
language : en
Publisher:
Release Date : 2004

Evaluation Of A Laboratory Accelerated Stripping Simulator For Hot Mix Asphalt Mixes written by Vernon Morgan Moore and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with Asphalt categories.

Moisture susceptibility of hot mix asphalt (HMA) pavements continues to be a major pavement distress. Past research has primarily focused on HMA stripping prevention through material component evaluation/testing and addition of preventative additives. Stripping is caused by traffic, water, and high in-place service temperatures. Today, agencies use various methods to evaluate HMA moisture susceptibility with varying degrees of success. The study objective was to evaluate a prototype stripping simulator's ability to predict HMA moisture susceptibility. The simulator evaluates moisture susceptibility by measuring conditioning water turbidity. Boil test and indirect tensile strength testing were also conducted for comparison purposes. Stripping simulator results indicate further refinement is required before it can be used for moisture susceptibility prediction.

Laboratory Evaluation Of Anti Strip Additives In Hot Mix Asphalt

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Author : Bradley J. Putnam
language : en
Publisher:
Release Date : 2006

Laboratory Evaluation Of Anti Strip Additives In Hot Mix Asphalt written by Bradley J. Putnam and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006 with Asphalt categories.

The use of hydrated lime or other liquid anti stripping agents (ASA) is the most common method to improve the moisture susceptibility of asphalt mixes. However, most laboratory test conditions used to evaluate the moisture susceptibility of the mixes are only for a short duration of time. This might not be a good representation of the field conditions (i.e., several months or years of service). Thus, a study to evaluate the effects of conditioning the mixes for longer durations was initiated. Also, another problem with the use of the liquid anti stripping agents is their heat storage stability. This report addresses these two issues, by preparing and testing mixtures made with fresh binder for indirect tensile strength after conditioning the samples for 1, 7, 28, 90 and 180 days, and samples prepared from binder stored for three days at 160° C after conditioning them for 1, 28 and 90 days. The results of this study indicated that hydrated lime and the liquid anti stripping agents were equally effective for the mixes used in this research when conditioned beyond one day. In the case of samples prepared from stored binder, there was no significant difference in the effectiveness of hydrated lime and the liquid anti stripping agents even after conditioning for one day. Though it was observed that none of the ASA treatments performed better than others in the case of samples prepared with stored binder, it was also observed that almost all mixes gave significantly similar wet ITS and TSR values as samples prepared from fresh binder.

Laboratory Accelerated Stripping Simulator For Hot Mix Asphalt

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Author : M. Shane Buchanan
language : en
Publisher:
Release Date : 2005

Laboratory Accelerated Stripping Simulator For Hot Mix Asphalt written by M. Shane Buchanan and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with Pavements, Asphalt categories.

Evaluation Of Stripping Propensity Of Hot Mix Asphalt Mixtures Using Aggregate Modifiers

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Author : Assim M. Hagalwadi
language : en
Publisher:
Release Date : 1990

Evaluation Of Stripping Propensity Of Hot Mix Asphalt Mixtures Using Aggregate Modifiers written by Assim M. Hagalwadi and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1990 with Aggregates (Building materials) categories.

Evaluation Of The Mmls3 For Accelerated Wearing Of Asphalt Pavement Mixtures Containing Carbonate Aggregates

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Author : Cristian Druta
language : en
Publisher:
Release Date : 2014

Evaluation Of The Mmls3 For Accelerated Wearing Of Asphalt Pavement Mixtures Containing Carbonate Aggregates written by Cristian Druta and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with Aggregates (Building materials) categories.

The purpose of this study was to develop an accelerated wearing protocol for assessing the susceptibility of asphalt surface mixtures to polishing. This was the second phase of the study. The first phase focused on assessing the characteristics of selected carbonate aggregates available in Virginia that are normally classified as polishing and thus not considered suitable for use in pavements except for those roads with an average daily traffic of less than 750 vehicles per day. The selection of aggregates used in pavements is critical in producing surfaces that will continue to provide good skid resistance through a lengthy service life.The specifications of the Virginia Department of Transportation (VDOT) call for non-polishing aggregate for use in most surface layers. The study was aimed at making use of locally available polishing aggregates that can reduce the cost of asphalt mixtures while maintaining satisfactory wearing and skid characteristics of the pavements. The objectives of the research were (1) to evaluate the polishing/wear features of mixtures containing limestone aggregate in the laboratory using an accelerated method; (2) to compare friction properties of the laboratory-polished specimens with actual pavement friction measurements; and (3) to compare friction properties of mixtures containing carbonate rock or blends with those of mixtures with non-carbonate rocks.The study included three types of aggregates, i.e., limestone, quartzite, and granite, and blends of these aggregates. The surface mixtures studied were conventional SM-9.5 and SM-12.5 mixtures containing various percentages of limestone, limestone recycled asphalt pavement, and limestone-granite/quartzite blends. The suggested test protocol to evaluate the polishing of asphalt concrete specimens prepared in the laboratory was developed using the third-scale model mobile load simulator (MMLS3). The MMLS3 is capable of applying realistic rolling wheel contact stresses similar to those on highways from the moving traffic.The skid resistance, friction, and texture of actual pavement surfaces and laboratory-fabricated specimens were measured after different polishing intervals. Skid resistance and frictional characteristics were measured by the British pendulum tester, dynamic friction tester, and locked-wheel skid tester; the circular texture meter was used to measure surface macrotexture. Results showed that the MMLS3 can be used to simulate traffic wearing of asphalt concrete specimens of different shapes and sizes in the laboratory including core specimens removed from existing pavements and that the BPT is effective in characterizing changes in friction on specimens that are subjected to simulated trafficking via the MMLS3. Further, test specimens should have a high initial macrotexture and mixtures should have good stability so that the wearing effects are focused on the aggregates. The study recommends that the Virginia Center for Transportation Innovation and Research (VCTIR) work with Virginia Tech and VDOTs western districts to design and conduct an experiment to explore a series of carbonate / non-carbonate aggregate blends for asphalt mixtures and that the mixture gradations be designed to prevent the absence of macrotexture from impacting the ability to measure the polish of the coarse aggregate structure of the experimental mixtures. VCTIR should purchase tires with different tread patterns and try them on the MMLS3 to evaluate the polishing rate of specimens in more detail.

Evaluation Of Warm Mix Asphalt Mixtures Containing Rap Using Accelerated Loading Tests

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Author : Munir D. Nazzal
language : en
Publisher:
Release Date : 2011

Evaluation Of Warm Mix Asphalt Mixtures Containing Rap Using Accelerated Loading Tests written by Munir D. Nazzal and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with Accelerated loading tests categories.

This paper presents the results of a study that was conducted to evaluate the performance and constructability of warm mix asphalt (WMA) mixtures containing reclaimed asphalt pavement (RAP). Four sections were constructed at the indoor Accelerated Pavement Loading Facility at Ohio University. Aspha-min, Sasobit, and Evotherm WMA mixtures were used in the wearing course layer of the first three sections. In addition, the fourth section had a conventional hot mix asphalt (HMA) mixture, which was used as a control. Temperature was monitored during the production, placement, and compaction of WMA and HMA mixtures. Furthermore, emission tests were conducted at the asphalt plants during the production of each of the evaluated mixtures. Falling weight deflectometer (FWD) and rolling wheel tests were conducted at different temperatures on all evaluated sections. The results of this study showed that emissions were reduced during the production of the Aspha-min and Sasobit WMA mixtures by at least 50 % for volatile organic compounds, 60 % for carbon monoxide, 20 % for nitrogen oxides, and 83 % for sulfur dioxide, when compared to the control HMA mixture. In addition, although WMA mixtures were produced and compacted at much lower temperatures, they achieved better field densities than the control HMA mixture. The FWD test results showed that at 40°F (4°C) test temperature, the control HMA mixture had significantly lower stiffness than that of the WMA mixtures. However, the FWD stiffness measurement of the HMA and the WMA mixtures were statistically indistinguishable at the intermediate and high test temperatures of 70°F (21.1°C) and 104°F (40°C), respectively. Finally, the rolling wheel test results indicated that the three WMA sections, especially the Evotherm section, exhibited more rutting than the control HMA section during the post primary compaction stage. However, the rutting rate of the HMA section was higher than those of the WMA sections in the secondary stage, which suggests that the rutting difference may slowly be mitigated.

Laboratory Evaluation Of Hot Mix Asphalt Hma In Delaware

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Author : Prarthana Banerji
language : en
Publisher:
Release Date : 2007

Laboratory Evaluation Of Hot Mix Asphalt Hma In Delaware written by Prarthana Banerji and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007 with categories.

Pavement design approach is slowly moving towards the mechanistic design approach from the traditional pavement design. One of the drawbacks of traditional pavement design is that it does not take into consideration the effect of changing load types in the design. Hence the mechanistic design approach has an edge over the traditional pavement design in this aspect. The mechanistic design approach also helps in improved characterization and utilization of available materials, better prediction of performance, and improved definition of existing pavement layer properties as well as the accommodation of environmental and aging effects. The success of the mechanistic design approach is dependent on understanding the behavior of the material properties. Of all the material properties, resilient modulus is the most important of all because it helps in better characterization of the stress - strain relationship of the material. The advantages of resilient modulus is that it is: (1) used to define fundamental material properties, (2) used in constitutive models, (3) used to predict stress, strain, and displacement, (4) used to develop performance models, (5) used in the current American Association of State Highway and Transportation Officials (AASHTO) pavement design guide and (6) used in the mechanistic design approach. The focus of this research is to evaluate the resilient modulus of several mixtures from DelDOT. Hence the goal is to develop quantitative models of Resilient Modulus of Delaware Hot Mix Asphalt (HMA). This research will help to increase the understanding of the behavior of construction materials that are used in Delaware and also provide a database of resilient moduli for further analysis and refinement of pavement design and evaluation. The resilient modulus test carried out in this research uses aspects of AASHTO and American Society for Testing and Materials (ASTM) test methods for determining the resilient modulus of bituminous mixtures by indirect tension.

The Roles Of Accelerated Pavement Testing In Pavement Sustainability

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Author : José P. Aguiar-Moya
language : en
Publisher: Springer
Release Date : 2016-09-15

The Roles Of Accelerated Pavement Testing In Pavement Sustainability written by José P. Aguiar-Moya and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016-09-15 with Technology & Engineering categories.

This compendium gathers the latest advances in the area of Accelerated Pavement Testing (APT), a means of testing full-scale pavement construction in an accelerated manner for structural deterioration in a very short term. Compiling novel research results presented at the 5th International Conference on Accelerated Pavement Testing, San Jose, Costa Rica, the volume serves as a timely and highly relevant resource for materials scientists and engineers interested in determining the performance of a pavement structure during its service life (10+ years) in a few weeks or months.

Development Of A Rapid Test To Determine Moisture Sensitivity Of Hot Mix Asphalt Superpave Mixtures

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Author : Chandra Manandhar
language : en
Publisher:
Release Date : 2010

Development Of A Rapid Test To Determine Moisture Sensitivity Of Hot Mix Asphalt Superpave Mixtures written by Chandra Manandhar and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with Asphalt concrete categories.

Existing test methods to determine moisture sensitivity in Hot Mix Asphalt (HMA) are time consuming and inconsistent. This research focused on wheel tracking devices to develop a rapid test method to evaluate moisture sensitivity. The Asphalt Pavement Analyzer (APA) and the Hamburg Wheel Tracking Device (HWTD) were used for this research. Compacted cylindrical samples were fabricated using a Superpave gyratory compactor. This study selected two most commonly used mixtures, SM-12.5A with Pg 64-22 binder in overlay projects and SM-19A mixtures with PG 64-22 binder for major modification projects at the Kansas Department of Transportation. Test results show that APA tests could induce stripping in most samples without any anti-stripping agent, which could be indentified visually. However, APA results do not indicate any stripping inflection point while the HWTD results show stripping inflection points, which are important to indentify stripping potential of mixtures. The APA results show that wet tests are severe at lower temperatures whereas dry tests show high rut depths at higher temperatures. The HWTD results show improvement in the performance using anti-stripping agents at later stage. The HWTD test is more effective than the APA as a rapid test method for determining moisture sensitivity of HMA. Laboratory results from this study should be verified and correlated with field performance.