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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: Durability of an Arctic Concrete
Author(s): Micheline RegourdI
Publication: Special Publication
Appears on pages(s): 919-935
Keywords: aggregates; chlorides; compressive strength; concrete durability; low temperature; sulfates; sulfides; General
Abstract:The use of unconventional aggregates, which includes several sulfide minerals, in making concrete in the Canadian Arctic aroused the interest of the authors to investigate the durability of such a concrete subjected to a very cold environment. Compressive strength measurements on concrete samples three and nine years old, cored in a dock, show that the concrete is still very strong--at least 28 MPa (4000 psi). A close examination of the aggregates and concrete microstructure suggests the concrete is durable. The presence of these aggregates does not give rise to any deleterious effect. The concrete is found to be a dense one. Only a superficial layer of a few millimeters thick has been transformed by carbonation. This zone, enriched in potassium, does not contain any Ca(OH)2 crystal. Its C-S-H has a low CaO/SiO2 ratio and is sometimes replaced by a siliceous gel. Penetration of chloride and sulfate ions is also observed but is not related to any concrete damage. The presence of a large amount of Ca(OH)2 and calcium rich C-S-H (C/S ÷ 1.7) below the thin carbonated layer corresponds to a high chemical stability of the concrete.
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