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Autogenous and drying shrinkage of high strength lightweight aggregate concrete at early ages - The effect of specimen size



Title: Autogenous and drying shrinkage of high strength lightweight aggregate concrete at early ages - The effect of specimen size
Author(s): P. Lura, K. van Breugel
Paper category : conference
Book title: International RILEM Conference on Early Age Cracking in Cementitious Systems
Editor(s): K. Kovler and A. Bentur
Print-ISBN: 2-912143-29-2
e-ISBN: 2351580362
Publisher: RILEM Publications SARL
Publication year: 2003
Pages: 335 - 342
Total Pages: 8
Nb references: 9
Language: English


Abstract: Concrete with a nominal characteristic cube compressive strength of 65 MPa is made with a low water/binder ratio. In order to avoid self-desiccation of the cement paste, it is possible to add saturated lightweight aggregates (LWA) in the fresh mix. This addition modifies the deformational behaviour of the concrete.
In this contribution the results of an experimental program about autogenous and drying shrinkage of high-strength concrete mixtures. Variables were aggregate type (crushed aggregate or LWA), degree of saturation of the LWA (100% and 50%), specimen size (prisms 50x50x200 mm3, 100x100x400 mm3, 150x150x600 mm3) and age at start of drying (7 and 28 days). The experimental data are presented and evaluated. Drying shrinkage results are compared with predictions according to currently used formulae (Model Code ’90). Conclusions are drawn regarding the applicability of current codes to allow for the size effect in case of lightweight aggregate concrete (LWAC).


Online publication: 2010-06-02
Publication type : full_text
Public price (Euros): 0.00