Evaluation Of Stripping Propensity Of Hot Mix Asphalt Mixtures Using Aggregate Modifiers
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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.
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.
Aggregate Tests For Hot Mix Asphalt Mixtures Used In Pavements
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Author : Thomas D. White
language : en
Publisher: Transportation Research Board
Release Date : 2006
Aggregate Tests For Hot Mix Asphalt Mixtures Used In Pavements written by Thomas D. White and has been published by Transportation Research Board this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006 with Aggregates (Building materials) categories.
Introduction and research approach -- Findings -- Interpretation, appraisal, and application -- Conclusions and suggested research -- References -- Abbreviations used without definitions in TRB publications.
Hot Mix Asphalt Mixtures
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Author :
language : en
Publisher:
Release Date : 1999
Hot Mix Asphalt Mixtures written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1999 with categories.
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
Water Sensitivity Of Asphalt Aggregate Mixes
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Author : Ronald L. Terrel
language : en
Publisher: National Research Council
Release Date : 1994
Water Sensitivity Of Asphalt Aggregate Mixes written by Ronald L. Terrel and has been published by National Research Council this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994 with Technology & Engineering categories.
The research presented in this report was conducted to identify the important factors influencing the water sensitivity of asphalt paving mixtures, and to develop a test method to evaluate water sensitivity of asphalt concrete mixtures for mix design. The test method was to be performance related. A review of current procedures revealed that no single method was suitable for evaluation and related to field performance. Based on a hypothesis that air voids in the mixture may be the major source and cause of water damage, a test system was developed to evaluate the major factors that influence water sensitivity. The Environmental Conditioning System (ECS) was used to develop a test procedure that includes specimen preparation; measurement of permeability using air, water, or both; vacuum wetting; cycling at various temperatures; and continuous repeated loading while monitoring resilient modulus after each conditioning cycle.
Performance Evaluation Of Foamed Warm Mix Asphalt Produced By Water Injection
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Author : Ayman Ali
language : en
Publisher:
Release Date : 2013
Performance Evaluation Of Foamed Warm Mix Asphalt Produced By Water Injection written by Ayman Ali and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with Asphalt categories.
In recent years, a new group of technologies has been introduced in the United States that allow producing asphalt mixtures at temperatures 30 to 100oF lower than what is used in traditional hot mix asphalt (HMA). These technologies are commonly referred to as Warm Mix Asphalt (WMA). From among these technologies, foamed WMA produced by water injection has gained increased attention from the asphalt paving industry in Ohio since it does not require the use of costly additives. This type of asphalt mixtures is advertised as an environmentally friendly alternative to traditional HMA and promoted to have better workability and compactability. In spite of these advantages, several concerns have been raised regarding the performance of foamed WMA because of the reduced production temperature and its impact on aggregate drying and asphalt binder aging. Main concerns include increased propensity for moisture-induced damage (durability) and increased susceptibility to permanent deformation (rutting). Other concerns include insufficient coating of coarse aggregates, and applicability of HMA mix design procedures to foamed WMA mixtures. This dissertation presents the results of a comprehensive study conducted to evaluate the laboratory performance of foamed WMA mixtures with regard to permanent deformation, moisture-induced damage, fatigue cracking, and low-temperature (thermal) cracking; and compare it to traditional HMA. In addition, the workability of foamed WMA and HMA mixtures was evaluated using a new device that was designed and fabricated at the University of Akron, and the compactability of both mixtures was examined by analyzing compaction data collected using the Superpave gyratory compactor. The effect of the temperature reduction, foaming water content, and aggregate moisture content on the performance of foamed WMA was also investigated. Furthermore, the rutting performance of plant-produced foamed WMA and HMA mixtures was evaluated in the Accelerated Pavement Load Facility (APLF) at Ohio University, and the long-term performance of pavement structures constructed using foamed WMA and HMA surface and intermediate courses was analyzed using the Mechanistic-Empirical Pavement Design Guide (MEPDG). Based on the experimental test results and the subsequent analyses findings, the following are the main conclusions made: In general, comparable laboratory test results were obtained for foamed WMA and HMA mixtures prepared using 30°F (16.7°C) temperature reduction, 1.8% foaming water content, and fully dried aggregates. Therefore, the performance of the resulting foamed WMA is expected to be similar to that of the HMA. Surface foamed WMA mixtures had comparable rutting performance in the APLF to that of the HMA mixtures. This was also the case for intermediate foamed WMA and HMA mixtures. These results indicate the field performance of the foamed WMA mixtures is similar to that of the HMA mixtures.
Validation Of Performance Related Test Of Aggregates For Use In Hot Mix Asphalt Pavements
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Author :
language : en
Publisher:
Release Date : 2006
Validation Of Performance Related Test Of Aggregates For Use In Hot Mix Asphalt Pavements written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006 with Aggregates (Building materials) categories.
This document contains the appendixes to NCHRP Report 557, "Aggregate Tests for Hot-Mix Asphalt Mixtures Used in Pavements." NCHRP Report 557 examines performance-based procedures to test aggregates for use in pavements utilizing hot-mix asphalt (HMA) mixtures and provides guidance on using these procedures for evaluating and selecting aggregates for use in specific mixture applications. The appendixes are as follows: (A) Petrographic Analysis Results; (B) Laboratory HMA Mixture Design Results; (C) Aggregate Test; (D) Test Section Construction and Control; (E) Moisture Susceptibility; and (F) Bibliography.
Master S Theses In The Natural And Technical Sciences
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Author :
language : en
Publisher:
Release Date : 1990
Master S Theses In The Natural And Technical Sciences written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1990 with Dissertations, Academic categories.
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.