ADHESION IMPROVEMENT BETWEEN BITUMEN AND MINERAL AGGREGATE: THEORETICAL PRINCIPLES AND THEIR IMPACT ON PAVEMENT STRUCTURE LIFETIME

1,2 TREJBAL Jan
Co-authors:
1,2 DEMO Pavel 1 NEŽERKA Václav 1,2 SVESHNIKOV Alexey 1 VALENTOVÁ Tereza 1 VALENTIN Jan
Institutions:
1 Czech Technical University in Prague, Faculty of Civil Engineering, Prague, Czech Republic, EU, jan.trejbal@fsv.cvut.cz, vaclav.nezerka@fsv.cvut.cz, alexey.sveshnikov@fsv.cvut.cz, tereza.valentova@fsv.cvut.cz, jan.valentin@fsv.cvut.cz
2 Czech Academy of Science, Institute of Physic, Prague, Czech Republic, EU, demo@fzu.cz
Conference:
10th International Conference on Nanomaterials - Research & Application, Hotel Voronez I, Brno, Czech Republic, EU, October 17th - 19th 2018
Proceedings:
Proceedings 10th International Conference on Nanomaterials - Research & Application
Pages:
192-197
ISBN:
978-80-87294-89-5
ISSN:
2694-930X
Published:
28th February 2019
Proceedings of the conference were published in Web of Science and Scopus.
Metrics:
58 views / 17 downloads
Abstract

Pavement structures often fail due to insufficient interphase interaction between bituminous binder and mineral aggregate. A thin bituminous film covering aggregate particles is often replaced by water, resulting in bitumen-water-aggregate system, which is firmly linked to adhesion failure between these materials. This paper describes how to avoid this phenomenon using nanomaterial based admixtures – adhesion promoters maximizing the formation of intermolecular interactions between bitumen and aggregate surfaces. Physicochemical and topological principles about interaction between the two materials were described. Regular paving grade bitumen 50/70 was modified by additives based on: (i) alkylsilanes; (ii) phosphorus compounds; and (iii) amines. Mineral aggregate grains (maximal size of 16 mm, pre-heated on 160±5 °C) were covered by the thin film of reference and such modified binders (170±5 °C). In this way prepared samples were exposed to water (60 °C) for 60 minutes. After samples removing from water, their digital images were obtained and then an area of aggregate grains covered by the bituminous thin film was assessed using: (i) bitumen adhesion test; following relevant technical standards; (ii) digital image analysis based on both gray level thresholding and entropy-based segmentation. It was shown that adhesion of the bitumen to aggregate, expressed by aggregate particle coating area, was increased by almost 18 %, if adhesion promoters were used.

Keywords: Asphalt mixture, adhesion promoters, interface interaction, coated area

© This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Scroll to Top