Study of the amine-based liquid anti-stripping agents by simulating hot mix asphalt plant production process

•The effects of liquid antistripping additives on moisture sensitivity of hot mix asphalt is experimentally studied.•The plant production condition is considered in the experiments.•The plant and lab samples are extensively compared.•The presented methodology is highly efficient for the HMA producti...

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Bibliographic Details
Published in:Construction & building materials 2017-12, Vol.157, p.1011-1017
Main Authors: Hesami, Ebrahim, Mehdizadeh, Gholamreza
Format: Article
Language:English
Subjects:
Analysis
Asphalt pavements
Chemical properties
Hot mix asphalt
Liquid anti-stripping materials
Mechanical properties
Moisture
Moisture susceptibility
Strength (Materials)
Tensile strength
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Summary:•The effects of liquid antistripping additives on moisture sensitivity of hot mix asphalt is experimentally studied.•The plant production condition is considered in the experiments.•The plant and lab samples are extensively compared.•The presented methodology is highly efficient for the HMA production plants. Stripping is one of the major distresses threatening the longevity of hot mix asphalt (HMA) pavements. Numerous types of liquid anti-stripping agents have been introduced to reduce moisture susceptibility of the Asphalt in HMA pavements. However, laboratory findings on the asphalt binder samples might be quite different with the actual conditions of mixing processes in asphalt plants. In HMA production plants, HMA mixtures and/or asphalt stored in asphalt storage tanks, are kept at high temperatures for hours, which drastically reduces the effectiveness of liquid anti-stripping agents. In this study, it is intended to simulate the HMA production conditions and then investigate the impacts of two types of liquid amine-based anti-stripping agents on the performance of HMA using the tensile strength ratio (TSR) and semi-circular Bending (SCB) tests. Results of this study indicated that effectiveness of these additives was significantly decreased after long-term being heated for HMA production. It is recommended that use of the manufacturer’s suggested percentages of liquid anti-stripping additives, should be carefully reexamined with regard to production conditions.
ISSN:0950-0618
1879-0526
DOI:10.1016/j.conbuildmat.2017.09.168