SIPS 2018

DETAILLED PROGRAM OVERVIEW

Modern Methods of Determining Road Bitumen Adhesiveness to Natural Aggregates
Loredana Judele¹; Daniel Lepadatu¹; Iulian Cucos²; Mihaela Movila¹;
¹TECHNICAL UNIVERSITY GHEORGHE ASACHI OF IASI, FACULTY OF CIVIL ENGINEERING AND BUILDING SERVICE, IASI, Romania; ²TECHNICAL UNIVERSITY GHEORGHE ASACHI OF IASI, FACULTY OF HYDROTECHNICAL ENGINEERING, GEODESY AND ENVIRONMENTAL ENGINEERING, IASI, Romania;
PAPER: 186/AdvancedMaterials/Regular (Oral)
SCHEDULED: 12:10/Wed./Grego (50/3rd)

ABSTRACT:
Asphalt coatings are preferred for the construction and/or rehabilitation of highways. They are very common in the world, and have the advantage of being more easily executed and maintained than cement concrete. The use of new technologies using added and/or modified bitumen, fiber additions (cellulose, synthetics, etc.) has been observed in recent years, allowing for improved performance in terms of increased lifetime and widening the thermal domain where the mix improves its properties. Adhesion between bitumen and natural aggregates is a key factor in the service life of wearing courses. Very often, the cause of the defects appearing on the surface of the road can be attributed to an inadequate adhesiveness between the bitumen and the natural aggregates. The main function of the bitumen is to act as an adhesive, and its good adhesiveness to the mineral aggregate is essential for obtaining a mixture of high quality asphalt. The need to ensure a link between aggregates and asphalt is very important and that is why we use, more and more often, the doping of bitumens, namely to add small amounts additive (0.1-0.5%) in the bitumen mass. Analyzing and assessing wetted materials in the laboratory is not an easy mission. They are based especially on the expert opinion (assessment) of the technician that performs the assays, even if some of the mechanical characteristics are quantified or standardized. Although the incidence of premature failure due to adhesiveness is relatively rare, fractures can involve significant costs when they occur. The goal of this research is to compare the adhesiveness results of a set of bitumen (achieved through quantitative determination method and Rolling Bottle Method (RBM) like classic methods) to the results achieved through experimental trials on the same set using the "Average Percentages of Black" (APB) method and PHP program. Not only are the two sets of results compared, but also the two methods—a traditional and a modern one, each with their own advantages and disadvantages.

References:
[1] Nasler I., H. Beckedahl, Adhesion between aggregates and bitumen - performance testing of compacted asphalt specimens by means of the dynamic indirect tensile test, Euroasphalt&Eurobitume Congress; Barcelona (2000).
[2] Gugiuman G. Bitume routier avec adjouvant- Euroasphalt&Eurobitume Congress; Barcelona (2000).
[3] Mohammad I. Hossain, Rafiqul A. Tarefder, Determination of Adhesive and Cohesive Damages in Asphalt Concrete by Finite Element Method, International Journal of Civil Engineering and Structures, ISSN: 2160-6676, 1,1, (2012).
[4] Judele L., M. Barbuta, D. Lepadatu, Structure and role of additive in bitumen adhesion to natural aggregates, 14th SGEM GeoConference on Nano, Bio And Green - Technologies For A Sustainable Future, Vol. 2, No. SGEM2014 Conference Proceedings, ISBN 978-619-7105-21-6, 2, (2014), 307-314.
[5] Judele L., THE MECHANISM OF BITUMEN ADHESION TO AGGREGATES THE INFLUENCE OF MINERALOGYC NATURE, Bulletin of the Polytechnic Institute of Iassy, Tom LVII(LXI), 2, (2011), 175-181.