SCC with High Green Strength - Thixotropic Investigations on Paste

Title: SCC with High Green Strength - Thixotropic Investigations on Paste
Author(s): R. Breitenbücher, A. Cokovik
Paper category : conference
Book title: International RILEM Conference on Material Science
Editor(s): W. Brameshuber
Print-ISBN: 978-2-35158-110-0
e-ISBN: 978-2-35158-111-7
Publisher: RILEM Publications SARL
Publication year: 2010
Pages: 377 - 387
Total Pages: 11
Nb references: 24
Language: English

Abstract: Concrete paving by slip-form paver requires a very stiff consistency of the concrete. For concrete compaction usually internal vibrators are used, which are installed on the finisher. The local concentrated compaction leads to trails of the vibrators in the pavement, in which cracks may occur during the service life of the structure. The use of Self-Compacting Concrete (SCC) for slip-form paving could eliminate such negative effects. However, a conventional SCC is generally not suitable for slip-form paving because of its high flowability still after its installation. A more appropriate concrete has to exhibit high flowability during its installation but has to stiffen rapidly afterwards in order to reveal sufficient "green" strength when it leaves the slip-form paver.

Within the scope of a research project at the Institute for Building Materials at the Ruhr-University Bochum rheological investigations were carried out on different compositions of pastes as the most relevant component for the rheological behaviour of the concrete. High flowability in combination with a distinctive thixotropic behaviour were the main requirements for the properties of the pastes. For this purpose the use of thixotropic agent showed the most promising results.

Online publication: 2010-12-02
Publication type : full_text
Public price (Euros): 0.00