Study on the performance of high-point throwing non-vibration concrete

Author(s): Jianhua Wu, Haihong Zhao, Shangyong Zhou, Yi Zhang, Jianxiong Ye
Paper category: conference
Book title: Microstructural-related Durability of Cementitious Composites
Editor(s): Guang Ye, K. van Breugel, Wei Sun and Changwen Miao
Print ISBN: 978-2-35158-129-2
e-ISBN: 978-2-35158-123-0
Publisher: RILEM Publications SARL
Publication year: 2012
Pages: 300 - 308
Total Pages: 9
Language: English

Abstract: High-point throwing non-vibration concrete is a kind of concrete adopting high-dropping construction method, being able to fill up the mold and compact uniformly under the effect of kinetic energy and dead-weight. The characteristic of this concrete is that it will get some appropriate properties such as flow-ability, pass-ability and dense compaction after high dropping when being not segregated.
The results of this study are as follows: compared with self compacting concrete, the workability requirement of high-point throwing non-vibration concrete is lower, but the requirement for anti-segregation is stricter. Properties of concrete mixture in this experiment can satisfy the requirements of high dropping construction. Moreover, this concrete is still able to keep an appropriate flow-ability after high dropping, easily fill up the mold and compact uniformly finally. Strength values of this concrete for cubic samples with 12m height dropping are closed to those of normal SCC, and strength values of core samples are relative stable except 4Sq. These above show that there is no obvious negative influence of high dropping construction method on the workability and strength of the concrete. The result of rebounding test and ultrasonic pulse wave velocity test prove the dense compaction inside the concrete body without defects caused by free vibration.
Keywords: high-point throwing, non-vibration, casting height, strength stability

Online publication: 2012-05-16
Publication Type: full_text
Public price (Euros): 0.00