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Influence of vibration induced instability at fresh state on performance degradation of hardened concrete

Author(s):Xiaojian Gao, Yue Su and Junyi Zhang
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:9
Language : English

Abstract: Vibrating consolidation process is widely applied to field construction of cement concrete. Excessive vibration can easily lead to the segregation and bleeding of fresh concrete and induce strength and durability degradation of hardened concrete. In this study, two vibration amplitudes and vibrating duration were carried out for different rheological concrete mixtures to prepare column specimens. The variation of coarse
aggregate content and apparent density along casting depth was determined to evaluate the homogeneity of concrete. Mechanical strength and chloride permeability were performed on selected samples at different casting depths. It was found that plastic viscosity plays a main role in controlling segregation and the increase of vibrating duration causes more segregation increment for concrete with lower yield
stress and plastic viscosity. It can be concluded that the performance degradation of hardened concrete becomes worse under higher vibration amplitude and longer vibrating duration, with lower yield stress and plastic viscosity at fresh state.

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

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