Influence of workability and admixtures on the segregation of concrete during compaction

Title: Influence of workability and admixtures on the segregation of concrete during compaction
Author(s): Andreas Leemann, Frank Winnefeld
Paper category : conference
Book title: 2nd International RILEM Symposium on Advances in Concrete through Science and Engineering
Editor(s): J. Marchand, B. Bissonnette, R. Gagné, M. Jolin and F. Paradis
Print-ISBN: 2-35158-003-6
e-ISBN: 2351580028
Publisher: RILEM Publications SARL
Publication year: 2006
Nb references: 20
Language: English

Abstract: The spatial variability of concrete is an important parameter in regard to the durability of structures. It is mostly influenced by the way concrete is placed and compacted. A wide range of concrete is used nowadays due to ongoing development of superplasticizers (SP). However, little is known about the influence of SP on the segregation of concrete during compaction. In this study the influence of workability, superplasticizers and air entrainer on segregation of concrete during compaction is investigated. Additionally, the rheological properties of cement pastes with identical dosages of admixtures as used for the concrete mixtures are determined.
Segregation significantly increases with increasing flow values. When workability is kept constant by adjusting water-cement-ratio (w/c), SP do only slightly alter segregation. However, when the air void content is increased, segregation increases as well. The comparison of the segregation of concrete with the rheological parameters of cement pastes indicate that plastic viscosity is an important factor influencing segregation.

Online publication: 2006-08-02
Classification: 3.2 Theme 2: From Fresh to Hardened Concrete
Publication type : full_text
Public price (Euros): 0.00
doi: 10.1617/2351580028.069