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Mix stability as a criterion for optimizing the granular composition to improve concrete durability - An application



Title: Mix stability as a criterion for optimizing the granular composition to improve concrete durability - An application
Author(s): X. Willem, L. Courard, A. Darimont, R. Degeimbre
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: 12
Language: English


Abstract: The aim of this study was to check the ability of an optimizing method of granular composition to improve concrete durability. The key of this approach was fresh concrete stability after casting.
In this work, the “natural consolidation” of concrete was the settlement of fresh concrete after casting, induced by the weight of the material and due to the expelling of water out of the inter-granular voids. This contraction can come into view with the graduated emergence of a layer of bleeding water on the top of the sample. The Phase Volume Distribution Model (PVDM) based on Powers' quantitative description of water binding in cement paste, was developed by the authors to estimate natural consolidation intensity from measurements of hardened concrete porosity. In previous work, the authors suggested that the more efficient hardened concrete for durability was the one with the lower porosity without being submitted to an intensive natural consolidation. To find the granular mixtures that need low water content for a given consistency and that give good mix stability, the authors used the Compressive Packing Model (CPM) developed by LCPC with a supplementary criterion. For given granular materials, they searched among the granular mixtures having a packing density close to the maximal value, for the one that had the richest amount of particles in the 0,125/0,500 mm range.


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: 10.1617/2351580028.082


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