Investigation of early age deformation in self-compacting concrete

Title: Investigation of early age deformation in self-compacting concrete
Author(s): Oskar Esping, Ingemar Löfgren
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: 9
Language: English

Abstract: In the presented work, early age (< 24 h) autogenous deformation was measured and crack tendency due to plastic shrinkage was evaluated; see Esping and Löfgren [1]. For the autogenous deformation, a specially developed digital dilatometer was used which generated accurate measurements of the linear displacements of the concrete, which was cast in a vapour-proof flexible tube mould. The plastic shrinkage cracking tendency was evaluated by exposing concrete specimens to early drying conditions while these were restrained by an inner steel ring. A large number of different SCC constituents and mix compositions have been investigated: e.g. w/c-ratio from 0.38 to 0.67, silica fume, and different admixtures. For comparison, tests with standard concrete were also made. The influence of different constituents and mixes on the autogenous deformation and plastic shrinkage crack tendency was observed. The results indicated that a high crack tendency arose when there was: large autogenous shrinkage (silica addition, low w/c, high fineness); high water evaporation (high w/c, low fineness); retardation (retarder or high superplasticizer dosage); low content of coarse aggregate. Minimum crack tendency was found at w/c 0.55.

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: 10.1617/2351580028.058