Adhesion improvement between bitumen and mineral aggregate: theoretical principles and their impact on pavement structure lifetime
Result description
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 mixtureadhesion promotersinterface interactioncoated area
The result's identifiers
Result code in IS VaVaI
Alternative codes found
RIV/68378271:_____/19:00539234
Result on the web
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DOI - Digital Object Identifier
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Alternative languages
Result language
angličtina
Original language name
Adhesion improvement between bitumen and mineral aggregate: theoretical principles and their impact on pavement structure lifetime
Original language description
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.
Czech name
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Czech description
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Classification
Type
D - Article in proceedings
CEP classification
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OECD FORD branch
20101 - Civil engineering
Result continuities
Project
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2018
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Article name in the collection
NANOCON 2018 Conference Proceedings
ISBN
978-80-87294-89-5
ISSN
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e-ISSN
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Number of pages
6
Pages from-to
192-197
Publisher name
Tanger Ltd.
Place of publication
Ostrava
Event location
Hotel Voronez I, Brno
Event date
Oct 17, 2018
Type of event by nationality
WRD - Celosvětová akce
UT code for WoS article
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Basic information
Result type
D - Article in proceedings
OECD FORD
Civil engineering
Year of implementation
2018