Rheological behavior of concrete foundation during Pile-driving operations

Author(s): Vanhove Yannick, Djelal Chafika, Mariam Dairou, Francis Thibaut, Gotteland Philippe
Paper category: Proceedings
Book title: International RILEM Workshop on Rheological Measurements of Cement-based Materials IRWRMC’18
Editor(s): Chafika DJELAL, Yannick VANHOVE
Print-ISBN: 978-2-35158-230-5
e-ISBN: 978-2-35158-231-2
Publisher: RILEM Publications SARL
Publication year: 2019
Pages: 75 - 80
Total Pages: 6
Language: English

Abstract: This study is mainly concerned with a concrete placement problem encountered on pile driving jobs using hollow stem augers, namely: the difficulty of introducing a reinforcement cage into fresh concrete. To the best of our knowledge, no current test or recommendation serves to guarantee an appropriate casting technique for lowering a pile without blocking the reinforcement cage from entering into the fresh concrete. At the request of France's National Federation of Public Works (FNTP), a test has been developed to assess the capability of introducing reinforcements into concrete. Moreover, studies have been conducted to determine both the reinforcement embedment capacity vs. pile casting time and the rheological behavior of concrete used to produce the particular pile. This type of concrete is cast without applying vibration, thus offering a highly fluid consistency (SF SCC). The restructuring of concrete, and in particular its thixotropy and loss of workability, alter the capacity of reinforcement to embed into the material, as evidenced by a decrease in such capacity throughout the study (for the given duration and concrete mixes under study). It thus becomes possible to predict ultimate impediments when the extent of concrete restructuring and the sequence for lowering reinforcement cages at the jobsite are both known.

Online publication : 2019
Publication type : full_text
Public price (Euros) : 0.00