Use of Self-compacting Concrete for Bonded Overlays
2007 (English)In: 5th International RILEM Symposium on Self-Compacting Concrete / [ed] G. De Schutter and V. Boel, 2007, 779-784 p.Conference paper (Other academic)
Bonded concrete overlays constitute a versatile repair method that has been used successfully for concrete bridge decks, concrete pavements, and industrial concrete floors during several decades. An ongoing RILEM Technical Committee (RILEM RLS) is currently finalizing a State-of-the-Art report and has just started to continue with guidelines. For bonded concrete overlays, the bond strength is a key factor. The TC has identified absence of substrate cleanliness, micro-cracking, absence of laitance layer, overlay compaction, and curing as the main factors promoting bond. The compaction is important, but need the right tools and skilled workmanship to meet the demands. The importance of good compaction increases if the surface is very rough and rebars need to be surrounded by the overlay concrete. This is usually the case when the powerful water-jet technology has been used. The overlay thickness may also limit the selection of suitable compaction tools. If self-compacting concrete (SCC) is used, the need of compaction tools vanishes. There are experiences both in the field and in the laboratory indicating that SCC overlays have performed well. This paper evaluates a series of SCC overlays reported in the literature and compares the results with vibrated concrete overlays. The performance of a SCC overlay seems to be similar to that of a normal vibrated concrete overlay conducted according to best practice.
Place, publisher, year, edition, pages
2007. 779-784 p.
IdentifiersURN: urn:nbn:se:kth:diva-66557ISBN: 978-2-35158-047-9ISBN: 978-2-35158-088-2OAI: oai:DiVA.org:kth-66557DiVA: diva2:484305
5th International RILEM Symposium on Self-Compacting Concrete, Ghent, Belgium, September 3-5
QC 201201272012-01-262012-01-262012-01-30Bibliographically approved