Refinement Of The Hot Mix Asphalt Ignition Method For High Loss Aggregates

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Refinement Of The Hot Mix Asphalt Ignition Method For High Loss Aggregates

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Author : Brian D. Prowell
language : en
Publisher:
Release Date : 2005

Refinement Of The Hot Mix Asphalt Ignition Method For High Loss Aggregates written by Brian D. Prowell and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with Aggregates (Building materials) categories.

This study evaluated four methodologies for determining the asphalt content of mixtures containing high loss aggregates in the ignition furnace. The methodologies tested were the standard method using the Thermolyne furnace (control), the Troxler NTO Infrared furnace, the Ontario Method using the Thermolyne furnace and a Tempyrox glass cleaning oven.

Determining The Binder Content Of Hot Mix Asphalt Containing Dolomitic Aggregates Using The Ignition Oven

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Author : Karol K. Kowalski
language : en
Publisher:
Release Date : 2010-10-15

Determining The Binder Content Of Hot Mix Asphalt Containing Dolomitic Aggregates Using The Ignition Oven written by Karol K. Kowalski and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010-10-15 with categories.

Modified Ignition Oven Test Procedure For Determination Of Binder Content In Hot Mix Asphalt Containing Dolomite Aggregate

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Author : Karol J. Kowalski
language : en
Publisher:
Release Date : 2011

Modified Ignition Oven Test Procedure For Determination Of Binder Content In Hot Mix Asphalt Containing Dolomite Aggregate written by Karol J. Kowalski and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with Binder content categories.

The binder content of hot mix asphalt (HMA) is most commonly determined either by solvent extraction or ignition oven (IO) methods. Generally, the IO method has worked well with various HMA mixtures except those containing certain types of high mass loss (decomposing) aggregates, especially dolomite. For these aggregates, the high temperatures experienced during the ignition process initiate chemical changes within the aggregate particles, which result in variable mass losses. This, in turn, causes difficulties in calculating a consistent correction factor and determining a repeatable binder content. This paper presents a modified IO binder content determination method, which involves lowering the test temperature to 427°C and reducing the sample mass by half. In addition, only the bottom material basket of the typical IO test setup is used to avoid errors in the results due to temperature differentials that develop when, upon ignition, mixture from the lower basket starts heating the mixture in the upper basket. The proposed method was successfully verified by using six different plant-produced mixtures.

A Manual For Design Of Hot Mix Asphalt With Commentary

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Author :
language : en
Publisher: Transportation Research Board
Release Date : 2011

A Manual For Design Of Hot Mix Asphalt With Commentary written by 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 2011 with Asphalt concrete categories.

Aggregate Properties And The Performance Of Superpave Designed Hot Mix Asphalt

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Author : Brian D. Prowell
language : en
Publisher: Transportation Research Board
Release Date : 2005

Aggregate Properties And The Performance Of Superpave Designed Hot Mix Asphalt written by Brian D. Prowell 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 2005 with Technology & Engineering categories.

Hot Mix Asphalt

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Author : Pierre Langlois
language : en
Publisher:
Release Date : 2006

Hot Mix Asphalt written by Pierre Langlois 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.

Influence Of Hot Mix Asphalt Parameters On The Correction Factors Of The Ignition Oven Test

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Author : PE. Sabaaly
language : en
Publisher:
Release Date : 2002

Influence Of Hot Mix Asphalt Parameters On The Correction Factors Of The Ignition Oven Test written by PE. Sabaaly and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002 with Aggregate categories.

The ignition oven method has been gaining popularity because of its applicability to both laboratory and field conditions, its nondependency on chemicals, and its ability to evaluate both binder content and aggregate gradations. However, the use of this method requires the careful determination of correction factors for both binder content and aggregate gradations. The need for such correction factors stems from the fact that most aggregates experience a certain level of weight loss as they are subjected to elevated temperatures. These weight losses must be accounted for in order to accurately determine the binder content and aggregate gradation of HMA mixtures. It is well accepted that the most important step of the ignition oven test is the determination of an accurate correction factor. The implementation of the ignition oven method requires the highway agency to assess the performance of the local materials with the test procedure and to identify the mixture parameters that significantly impact the determined correction factor. In preparation for the implementation of the ignition oven test, the Nevada Department of Transportation (NDOT) conducted an extensive laboratory testing program to assess the impact of the various mix parameters on the determination of the correction factors. The experiment included aggregate source, binder type, lime, and testing temperature. This paper analyzes the data generated from the NDOT experiment and evaluates the impact of each of the considered factors on the correction factor. In summary, the analysis of the data generated in the NDOT experiment showed that the aggregate source and the addition of lime have the most significant impact on the determined correction factor followed by the temperature and binder type. However, if during a field project the binder or the method of lime application changes, this change would not require the determination of a new correction factor. The data also showed that the blank aggregate method would generate correction factors that are less variable than the known asphalt content method.

Variability Of Ignition Furnace Correction Factors

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Author : Carolina Rodezno
language : en
Publisher:
Release Date : 2017

Variability Of Ignition Furnace Correction Factors written by Carolina Rodezno and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017 with Asphalt categories.

"Determining the Asphalt Binder Content of Hot Mix Asphalt (HMA) by the Ignition Method," requires determination of asphalt and aggregate correction factors for asphalt mix designs for each ignition furnace used to test a design. In some cases, where there are numerous asphalt mix designs or numerous ignition furnaces testing a particular mix design, correction factors may be shared between ignition furnaces, though this practice is not strictly permitted by AASHTO T 308 without supporting evidence. The objectives of this research were to (1) determine the significant influences that affect the variability of asphalt and aggregate correction factors for ignition furnaces; (2) develop guidelines for the installation, operation, and maintenance of ignition furnaces to minimize the variability in correction factors between furnaces; and (3) develop and document a statistically valid correction factor verification procedure to identify and troubleshoot causes for non-comparing, statistically different, or biased results of AASHTO T 308. The research was conducted in three parts: (1) a study of the sensitivity of asphalt and aggregate correction factors to variation in experimental factors such as furnace type, test temperature, asphalt content, and sample mass; (2) a round-robin study to identify correction factor outliers and determine the contributory cause(s); and (3) troubleshooting of outliers from the round-robin study. The research found that the primary factors affecting asphalt and aggregate correction factors determined by AASHTO T 308 are furnace type and test temperature. Conducting the test at 800°F appears to substantially reduce the magnitude and standard deviation of the correction factors for asphalt mixtures that do not contain lime. Sharing correction factors among different ignition furnaces appears acceptable for low correction factor aggregates (0.1% or less) but is problematic for aggregates with correction factors of 1.0% or greater. The current precision estimates in AASHTO T 308 appear applicable only to mixtures with low correction factor aggregates. The key product of this research is a Proposed Standard Practice for Installation, Operation, and Maintenance of Ignition Furnaces (Appendix I). Development of a verification procedure to identify causes for non-comparing, statistically different, or biased test results from ignition furnaces was found to be premature and further research is planned.

Hot Mix Asphalt Electronic Resource Lc Method Of Mix Design

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Author : Pierre Langlois
language : en
Publisher:
Release Date : 2006

Hot Mix Asphalt Electronic Resource Lc Method Of Mix Design written by Pierre Langlois 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.

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.