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Some Aspects of Foamed Bitumen Technology
KTH, School of Architecture and the Built Environment (ABE), Transport Science, Highway and Railway Engineering.
2011 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

Although foamed bitumen has been widely applied in pavement construction some of its aspects are still not yet understood. In this study, some of these aspects including: effects of the foaming process on binder chemistry, characterization of foamed bitumen and development of a rational method to optimize foam characteristics, evaluation of aggregate particle coating within foamed bitumen treated materials, and development of a gyratory compaction procedure for laterite gravels treated with foamed bitumen were addressed. The effects of the foaming process on bitumen chemistry were investigated using Fourier transform infrared spectroscopy techniques. Also, foam characteristics of three binders were established and a rational method to optimize foam characteristics proposed. Aggregate particle coating with foamed bitumen was studied using the concepts of surface energy and Rice density. In addition a gyratory laboratory compaction procedure for laterite gravels treated with foamed bitumen was established using the modified locking concept. Infrared techniques have shown that foaming does not cause any changes in the binder chemistry, suggesting that foaming may be a physical process. Further, foam characteristics are greatly influenced by binder viscosity. Also, the equiviscous temperature seems to produce foam with optimum foam characteristics. Rice density results showed that aggregate size fraction, binder expansion ratio and viscosity influenced aggregate particle coating. Surface energy results revealed that foamed bitumen exhibited better coating attributes than neat bitumen. A new compaction procedure for laterite gravels treated with foamed bitumen based on the modified locking point was developed.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology , 2011. , 52 p.
Series
Trita-VT. FR, ISSN 1650-867X
Keyword [en]
Foamed bitumen, Aggregate coating, Rice density, Foam characteristics, Surface energy, Locking concept, Gyratory, Compaction, Optimum moisture content
National Category
Other Civil Engineering
Identifiers
URN: urn:nbn:se:kth:diva-32944ISBN: 978-91-7415-910-3OAI: oai:DiVA.org:kth-32944DiVA: diva2:413017
Presentation
2011-04-28, M108, KTH, Brinellvägen 23, Stockholm, 09:00 (English)
Opponent
Supervisors
Note
QC 20110427Available from: 2011-04-27 Created: 2011-04-27 Last updated: 2012-02-23Bibliographically approved
List of papers
1. Foamed bitumen in bituminous paving technology : state-of-the-art
Open this publication in new window or tab >>Foamed bitumen in bituminous paving technology : state-of-the-art
(English)Manuscript (preprint) (Other academic)
Keyword
foamed bitumen, foamed bitumen mixes/mixtures, state of the art
National Category
Other Civil Engineering
Identifiers
urn:nbn:se:kth:diva-33049 (URN)
Note
QC 20110427Available from: 2011-04-27 Created: 2011-04-27 Last updated: 2016-10-19Bibliographically approved
2. Foaming Effects on Binder Chemistry and Aggregate Coatability using Foamed Bitumen
Open this publication in new window or tab >>Foaming Effects on Binder Chemistry and Aggregate Coatability using Foamed Bitumen
2011 (English)In: International Journal on Road Materials and Pavement Design, ISSN 1468-0629, Vol. 12, no 4, 821-847 p.Article in journal (Refereed) Published
Abstract [en]

Foaming effects on binder chemistry were investigated using two bitumens from different sources with similar grades. Infrared spectroscopy techniques were done on neat and foamed bitumen samples. Aggregate particle coating with foamed bitumen was studied using Rice density and surface energy concepts. Infrared spectra results showed that foaming does not change the bitumen chemistry. Rice density tests showed that the aggregate size mainly influenced binder coating of aggregate particles, bitumen was mostly concentrated within the fine fraction where foamed bitumen was used. Surface energy results revealed that foamed bitumen possesses higher coating attributes than neat bitumen. Film thickness results implied that aggregate size and surface area, expansion ratio and binder viscosity influences binder thickness.

Keyword
foamed bitumen, ageing, surface energy, aggregate coating, rice density, theoretical binder film thickness
National Category
Other Civil Engineering
Identifiers
urn:nbn:se:kth:diva-33037 (URN)10.3166/RMPD.12.821-847 (DOI)000298769200005 ()2-s2.0-84857566497 (ScopusID)
Note
QC 20120206. Uppdaterad från submitted till published 20120206Available from: 2011-04-27 Created: 2011-04-27 Last updated: 2016-10-19Bibliographically approved
3. Proposed gyratory compaction procedure for determining the optimal compaction characteristics of laterite gravels treated with foamed bitumen
Open this publication in new window or tab >>Proposed gyratory compaction procedure for determining the optimal compaction characteristics of laterite gravels treated with foamed bitumen
(English)Article in journal (Other academic) Submitted
Keyword
foamed bitumen, gyratory compaction, locking concept, moisture content
National Category
Other Civil Engineering
Identifiers
urn:nbn:se:kth:diva-33041 (URN)
Note
QS 20120328Available from: 2011-04-27 Created: 2011-04-27 Last updated: 2012-03-28Bibliographically approved

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