Shear Behavior of Fresh Concrete under variable Pressure – Development of a specific Testing Device

Author(s): Tilo Proske, Moien Rezvani
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: 93 - 97
Total Pages: 5
Language: English

Abstract: The development of formwork pressure is essentially affected by the shear behavior of fresh concrete, while the shear behavior itself might be influenced by the magnitude of normal pressure. A test set-up was developed in which the fresh concrete is sheared in a pressure cell by a vane as a part of a concrete rheometer (ICAR). The concrete is directly loaded in the pressure cell by a hydraulic jack. Preliminary tests on concretes with moderate and high flowability up to a pressure of 240 kPa were conducted with the focus on the static yield stress. The results show the significant influence of applied pressure on the measured yield torque or yield stress in early concrete age especially for concretes with moderate flowability. However, a significant increase of yield resistance by applied pressure was identified for all concretes at aging state.

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

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