The Effects of Liquid Anti-stripping Additives on the Performance of Asphalt Binder in Hot Mix Asphalt PDF Download
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Author: Kathryn Page Copeland
Publisher:
ISBN:
Category :
Languages : en
Pages : 172
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Book Description
Author: Kathryn Page Copeland
Publisher:
ISBN:
Category :
Languages : en
Pages : 172
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Book Description
Author: Bradley J. Putnam
Publisher:
ISBN:
Category : Asphalt
Languages : en
Pages : 178
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Book Description
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.
Author: Akhtarhusein Asgarali Tayebali
Publisher:
ISBN:
Category : Asphalt concrete
Languages : en
Pages : 96
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Book Description
Author: Christine W. Curtis
Publisher:
ISBN:
Category : Aggregates (Materials)
Languages : en
Pages : 30
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Book Description
The purpose of this literature review is to search the literature in the area of chemical and mineral agents used to promote adhesion of asphalt-aggregate mixes. In addition, tests performed to measure the effectiveness of these agents were reviewed. The information gained through this literature search and review provides background information for the research being performed in the SHRP A-003B contract. This literature search was performed using on-line chemical abstracts for documents in the time period of 1967 to present.
Author: Selvaratnam Selvamohan
Publisher:
ISBN:
Category : Asphalt
Languages : en
Pages : 342
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Book Description
Author: David G. Tunnicliff
Publisher: Transportation Research Board
ISBN: 9780309053747
Category : Technology & Engineering
Languages : en
Pages : 68
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Book Description
Author: Serge Desjardins
Publisher: Springer Nature
ISBN: 3031615115
Category :
Languages : en
Pages : 326
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Book Description
Author: F. M. Khoshnaw
Publisher: WIT Press
ISBN: 1845648889
Category : Political Science
Languages : en
Pages : 377
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Book Description
This book contains papers presented at the International Symposium on Urban Development held in the Kurdistan region of Iraq, organised by the Faculty of Engineering at Koya University. The Kurdistan region is rich in oil, gas, mineral resources and underground water. However, until recently the political and security issues were such that the region was unable to take advantage of those resources. Nowadays, Kurdistan is emerging as one of the fastest developing areas in the Middle East, with its universities playing a major role in this process. The aim of the meeting was to focus the research carried out at academic and government institutions with the needs of Society. The International Symposium papers included in this volume cover a wide range of topics and are written by people with different specialisations and perspectives.
Author:
Publisher:
ISBN:
Category : Asphalt
Languages : en
Pages : 144
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Book Description
Author: Aravinda Buddhala
Publisher:
ISBN:
Category : AD-here HP Plus
Languages : en
Pages : 9
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Book Description
Warm mix asphalt (WMA) is a fairly recent technology developed primarily to address issues such as high vapor emissions and high energy costs associated with the traditional hot mix asphalt (HMA) paving. Although the WMA is becoming a popular paving technology through field and laboratory evaluations, many researchers and transportation personnel are concerned about its moisture resistance. The present study analyzes the free energy of adhesion or wetting ability between eight different aggregates and an asphalt binder modified with varying dosages of two warm mix additives, namely Sasobit and Aspha-Min. Sasobit showed a maximum of 20.9 % and an average of 12.8 % increase in the free energy of adhesion in dry condition. The adhesion in the presence of moisture, referred to as free energy of reduction, was also evaluated to understand the moisture susceptibility of the WMA. The lower the free energy of reduction, the lower the asphalt binder's tendency to de-bond from aggregates in the presence of moisture. A maximum of 20.5 % and an average of 13.2 % decrease in the free energy of reduction were observed for asphalt binder with 3 % Sasobit. However, Aspha-Min did not exhibit any significant effect on any of the surface properties. One amine-based anti-stripping agent, AD-here HP Plus, is studied to evaluate its effect on adhesion and moisture susceptibility of the WMA. While its performance as an anti-stripping agent was good on the plain asphalt binder, AD-here HP Plus did not improve the adhesion of the selected binder modified with WMA additives either in dry or wet condition. The free energy of adhesion in wet and dry conditions showed either detrimental or no effect with selected aggregates, suggesting a negative or no influence of AD-here HP Plus on the WMA additive-modified binder.
