DBPapers
DOI: 10.5593/SGEM2014/B62/S26.040

STRUCTURE AND ROLE OF ADDITIVES IN BITUMEN ADHESION TO NATURAL AGGREGATES

J. Loredana, M. Barbuta, D. Lepadatu
Wednesday 1 October 2014 by Libadmin2014

References: 14th International Multidisciplinary Scientific GeoConference SGEM 2014, www.sgem.org, SGEM2014 Conference Proceedings, ISBN 978-619-7105-21-6 / ISSN 1314-2704, June 19-25, 2014, Book 6, Vol. 2, 307-314 pp

ABSTRACT
The road works at getting hot bituminous mixtures and not only an important
requirement of bitumen is to wet better natural aggregates. In order to ensure a stable connection between aggregate and bitumen are used increasingly more frequently in the addition (doping) of bitumen, i.e. bitumen mass addition of small amounts of additive (0.1-0.5%). Although the percentage of additive is small, laboratory tests show that adhesiveness increases substantially after introduction. The adhesion is one of the complex phenomena that occur at the contact bitumen - aggregate, some physical or physico-chemical phenomena (aggregate surface texture and porosity, bitumen viscosity, interfacial tension) and other chemical (mineralogical nature of the aggregates and the chemical composition of bitumen) . Typical adhesion is defined as the ability to cover a binder with an aggregate to disperse upon contact with water or traffic aggressions. Bitumen is a natural or artificial fluid of semi-solid consistency - dark color of brown to black, consisting of complex mixtures of organic substances with colloidal structure. The paper presents two of the additives with which I worked, their structure, how they act bitumen and some of the results obtained for adhesion (using both pure bitumen and bitumen additives). It should be binding to the aggregated particles or between particles and the surface of the existing connection. Although the incidence of premature rupture attributable to adhesion is relatively rare, substantial costs to breakdowns may occur at the time.

Keywords: additives, adhesiveness, aggregate, bitumen