Concrete-to-Concrete Bond of an Interface between Self-Consolidating Concrete and Vibrated Concrete

Author(s): Florian Junker, Klaus Holschemacher
Paper category: Conference
Book Title: 8th International RILEM Symposium on Self-Compacting Concrete - SCC 2016
Editor: Kamal H. Khayat
ISBN: 978-2-35158-156-8
e-ISBN: 978-2-35158-157-5
Publisher: RILEM Publications SARL
Publication year: 2016
Pages: 413-422
Total Pages: 11
Language: English

Abstract: Bonded and reinforced concrete overlays are widely used for precast elements, which receive an in-situ overlay. The performance of such overlays relates mainly to the concrete-to-concrete bond. The regulations of the German annex of Eurocode 2 for ‘shear at the interface between concrete cast at different times’ eliminates the usage of self-consolidating concrete (SCC). In this paper, the properties of the concrete-to-concrete bond of an interface between self-consolidating concrete (SCC) and vibrated concrete (VC) were studied. Therefore, splitting tensile tests were conducted on 150 mm cubes with an interface at middle height, which consists of concrete parts cast at different times. A series of parameters were studied. This includes the age and humidity of the substrate layer as well as the concrete layer combination. For the tests, the interface was placed as a “cold joint” and allowed to cure for 7 or 28 days prior to the placement of the upper side of the interface. The cubic compressive strength of the concrete ranged between 35 and 48 MPa after 28 days. Overall, 72 specimens were tested. The mixture design of the SCC is based on a combination-type with the usage of superplasticizer and stabilizer. The study proved that SCC has a significant concrete-to-concrete bond strength even though it has a smoother surface compared to VC.

Online publication: 2016
Publication Type: full_text
Public price (Euros): 0.00