Laboratory Evaluation Of Hot Mix Asphalt Hma In Delaware

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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.

Laboratory Evaluation Of Vestoplast Modified Hot Mix Asphalt Hma

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Author : Thomas Bennert
language : en
Publisher:
Release Date : 2007

Laboratory Evaluation Of Vestoplast Modified Hot Mix Asphalt Hma written by Thomas Bennert and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007 with Asphalt categories.

Laboratory Evaluation Of Warm Mix Asphalt

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Author : Zhanping Yuo
language : en
Publisher:
Release Date : 2011

Laboratory Evaluation Of Warm Mix Asphalt written by Zhanping Yuo and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with Asphalt emulsion mixtures categories.

Hot Mix Asphalt (HMA) has been traditionally produced at a discharge temperature of between 280° F (138° C) and 320° F (160° C), resulting in high energy (fuel) costs and generation of greenhouse gases. The goal for Warm Mix Asphalt (WMA) is to use existing HMA plants and specifications to produce quality dense graded mixtures at significantly lower temperatures. Europeans are using WMA technologies that allow the mixture to be placed at temperatures as low as 250° F (121° C). It is reported that energy savings on the order of 30%, with a corresponding reduction in CO2 emissions of 30%, are realized when WMA is used compared to conventional HMA. Although numerous studies have been conducted on WMA, only limited laboratory experiments are available and most of the current WMA laboratory test results are inconsistent and not compatible with field performance The main objectives of this study are: The main objectives of this study are: 1) review and synthesize information on the available WMA technologies; 2) measure the complex/dynamic modulus of WMA and the control mixtures (HMA) for comparison purpose and for use in mechanistic-empirical (ME) design comparison; 3) assess the rutting and fatigue potential of WMA mixtures; and 4) provide recommendation for the proper WMA for use in Michigan considering the aggregate, binder, and climatic factors. The testing results indicated that most of the WMA has higher fatigue life and TSR which indicated WMA has better fatigue cracking and moisture damage resistant; however, the rutting potential of most of the WMA tested were higher than the control HMA. In addition, the WMA design framework was developed based on the testing results, and presented in this study to allow contractors and state agencies to successfully design WMA around the state of Michigan.

Aggregate Contribution To Hot Mix Asphalt Hma Performance

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Author : Thomas D. White
language : en
Publisher: ASTM International
Release Date : 2001

Aggregate Contribution To Hot Mix Asphalt Hma Performance written by Thomas D. White and has been published by ASTM International this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001 with Technology & Engineering categories.

Containing 13 papers from the December 2000 conference in Orlando, Florida, this book covers the use of the PURWheel laboratory tracking device, the Asphalt Pavement Analyzer, the identification of aggregate role, the evaluation of sensitivity, fine aggregate angularity, guidelines for the selection

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 Evaluation Of The Addition Of Lime Treated Sand To Hot Mix Asphalt Hma

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Author : Douglas I. Hanson
language : en
Publisher:
Release Date : 1994*

Laboratory Evaluation Of The Addition Of Lime Treated Sand To Hot Mix Asphalt Hma written by Douglas I. Hanson and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994* with Lime categories.

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.

An Evaluation Of Laboratory Compactors And Binder Aging Methods For Hot Mix Asphalt Hma

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Author : Rajib Basu Mallick
language : en
Publisher:
Release Date : 1997

An Evaluation Of Laboratory Compactors And Binder Aging Methods For Hot Mix Asphalt Hma written by Rajib Basu Mallick and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1997 with Asphalt categories.

Laboratory Evaluation Of Warm Mix Asphalt Influence On Theoretical Maximum Specific Gravity

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Author : Jianhua Yu
language : en
Publisher:
Release Date : 2012

Laboratory Evaluation Of Warm Mix Asphalt Influence On Theoretical Maximum Specific Gravity written by Jianhua Yu and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with Asphalt concrete categories.

Warm mix asphalt (WMA) technology provides sufficient workability for asphalt mixtures at reduced mixing and compaction temperatures. Depending on the WMA technology, the typical temperature reduction range is 20 °C to 55 °C below hot mix asphalt (HMA) production temperatures. WMA involves chemical and wax additives that are added to an asphalt binder or incorporated through the use of foaming technology. The main advantages of WMA are reduced emissions and a reduction in combustible fuel consumption. Ongoing WMA research projects have documented some differences between HMA and WMA mixes, prompting numerous research projects that are investigating these concerns. The purpose of this research is to evaluate the volumetric properties by directly comparing laboratory produced WMA and HMA mixes. This study investigates the impact of WMA additives on the volumetric properties, specifically, the theoretical maximum specific gravity (Gmm). The Gmm testing followed the procedure of ASTM D2041. Two mix designs with HMA binder were produced, one without recycled asphalt pavement (RAP) and the other with 30 % RAP. After the mix designs were completed, no additional changes were made to account for the addition of the WMA technology. The mixes included the WMA technologies Sasobit and Advera, as well as an HMA control, for a total of six different laboratory produced mixes. Each mix was produced at 120 °C, 135 °C, and 150 °C, and each mix was oven cured for 1, 2, and 4 h. The test results were analyzed using statistical principles to determine whether differences in the Gmm values were statistically significant. The results show that temperature has little impact on Gmm. Gmm was not affected by curing times of 1 and 2 h, but the longer curing time of 4 h resulted in a statistically significant increase in Gmm. Further analysis revealed that the mix sensitivity to curing time depends on the amount of RAP in the mix. For the mix designs studied, the Advera Gmm values were similar to the HMA values, but the Sasobit Gmm values were statistically lower than the Advera values.

Short Term Laboratory Conditioning Of Asphalt Mixtures

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Author : David Newcomb
language : en
Publisher:
Release Date : 2015

Short Term Laboratory Conditioning Of Asphalt Mixtures written by David Newcomb and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with Asphalt categories.

This report develops procedures and associated criteria for laboratory conditioning of asphalt mixtures to simulate short-term aging. The report presents proposed changes to the American Association of State Highway and Transportation Officials (AASHTO) R 30, Mixture Conditioning of Hot-Mix Asphalt (HMA), and a proposed AASHTO practice for conducting plant aging studies. The report will be of immediate interest to materials engineers in state highway agencies and the construction industry with responsibility for design and production of hot and warm mix asphalt.