Effect of granular skeleton on concrete porosity and gas permeability: mix stability and consolidation process

Title: Effect of granular skeleton on concrete porosity and gas permeability: mix stability and consolidation process
Author(s): Xavier Willem, Luc Courard, Anne Darimont, Robert Degeimbre
Paper category : conference
Book title: International RILEM Symposium on Concrete Science and Engineering: A Tribute to Arnon Bentur
Editor(s): J. Weiss, K. Kovler, J. Marchand, and S. Mindess
Print-ISBN: None
e-ISBN: 2912143926
Publisher: RILEM Publications SARL
Publication year: 2004
Nb references: 8
Language: English

Abstract: The effects of granular skeleton on the concrete properties, particularly consistency, air content, porosity and gas permeability are fundamental to appreciate the durability of the final products. Three granular compositions are designed with a constant proportion of Portland cement. The proportions of aggregates are obtained from the Compressive Packing Model (CPM) developed by LCPC. Water content is variable. The study of concrete consolidation is based on measurements of hardened concrete porosity. Several test specimens are extracted from the bulk concrete at different positions inside the cast cube. It is showed that consolidation processes depend on water content, casting process and granular skeleton structure, and influence the properties of concrete. The amount of exuded water, and thus the amount of remained capillary water are not the same everywhere in the concrete mass. Moreover, casting process can influence the porous structure of capillaries depending on the consolidation intensity. The observations presented in the paper are directly related to the analysis of the results of gas permeability that is used in durability test evaluation and fluid transfer modelling.

Online publication: 2004-03-25
Classification: Applications
Publication type : full_text
Public price (Euros): 0.00
doi: 10.1617/2912143926.071