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:
5 views / 2 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
Scroll to Top