69. Mechanism of increased pressure loss of self-compacting concrete flowing through interspaces of steel bars

Title: 69. Mechanism of increased pressure loss of self-compacting concrete flowing through interspaces of steel bars
Author(s): M. Maruoka, H. Fujiwara, N. Watanabe, Y. Watanabe
Paper category : conference
Book title: 5th International RILEM Symposium on Self-Compacting Concrete
Editor(s): G. De Schutter and V. Boel
Print-ISBN: 978-2-35158-047-9
e-ISBN: 978-2-35158-088-2
Publisher: RILEM Publications SARL
Publication year: 2007
Pages: 461 - 466
Total Pages: 6
Nb references: 4
Language: English

Abstract: When self-compacting concrete flows through the interspaces between steel bars, a problem can occur due to an increased pressure loss, resulting in the occurrence of non-filled parts. In this study, a model of the mechanism of this increased pressure loss is considered in which, when concrete passes through spaces between steel bars, the flow velocity of coarse aggregate is low and the volume of coarse aggregate is increased, leading to apparent increases in yield stress of concrete and pressure loss. Rheological equations are derived to model this situation according to multi-phase flow dynamics, and their veracity was confirmed by performing a visual examination of a sample of concrete. As a result, the increased pressure loss mechanism can be explained by the proposed model.

Online publication: 2009-06-16
Publication type : full_text
Public price (Euros): 0.00