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Analytical approach to predict SCC pressure Loss during pumping

Author(s): Kamal H. Khayat, Rami Khatib and Dimitri Feys
Paper category: Proceedings
Book title:4th International Symposium on Design, Performance and Use of Self-Consolidating Concrete
Editor(s): Caijun Shi & Zuhua Zhang, Hunan University, China
Kamal Henri Khayat, Hunan University, China
Missouri University of Science & Technology, USA
Publisher: RILEM Publications SARL
Publication year:2018
Total Pages:1
Language : English

Abstract: High-rise buildings have become a prominent solution for increasing density in major cities around the world. Prediction of pumpability of concrete and the required pumping pressure is one of the most important requirements of ready-mixed concrete producers, concrete pump manufacturers, and pumping companies in high-rise buildings, bridges, and tunnels. Several research efforts and field experience testing campaigns have concentrated on the pumping of flowable concrete have established a variety of methods to assess pumping characteristics of concrete, focusing in most cases on predicting pumping pressure. In this paper, a comprehensive study linking the pressure loss in pumping pipes and the fundamental rheological properties of self-consolidating concrete (SCC) and those of the lubricating layer between the concrete and the pumpline is presented. The different flow zones across the pipe diameter are quantifiably described as a function of the rheological properties of concrete and applied pressure assuming Bingham behavior. An analytical model that can be used to compute pressure loss is then derived as a function of the flow rate, the rheological properties of both, concrete and the lubrication layer, and pipe diameter. The resulting model is analytically grounded and can be applied to predict the pumping pressure loss for a wide range of highly flowable concrete mixtures.

Online publication : 2018
Publication type : full_text
Public price (Euros) : 0.00

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