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Microstructure of Concretes Cast in the Canadian Arctic: Role of CaCl2 Used as an Anti-Freezing Agent

Published online by Cambridge University Press:  25 February 2011

M. Regourd ,
H. Hornain  and
P.-C. Aitcin
M. Regourd
Affiliation:
CERILH, 23 rue Je Cronstadt 75015, Paris, france
H. Hornain
Affiliation:
CERILH, 23 rue Je Cronstadt 75015, Paris, france
P.-C. Aitcin
Affiliation:
Universite de Sherbrooke, Faculte des Sciences Appliquees, Sherbrooke, Quebec JIK 2R1, Canada
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Abstract

Two concretes were made in the Canadian Arctic at sub-freezing temperature using an unusually high amount of calcium chloride, about 9% of the cement mass. Calcium chloride in such a high dosage was mainly used as an antifreezing admixture, because it was impossible to heat the cement and the aggregates prior to the batching and cure the concrete properly after its pouring.

One of these two concretes was cast inside a mine, where the temperature is about −10°C all year round. After one year of service, the strength of this concrete was determined to be 39 MPa at room temperature. The second one was cast outside the mine at −30°C during winter and was exposed to temperatures above 0°C the following summer. After one winter of service the strength of this was 5 MPa.

These two concretes were examined under the SEM and show quite a dense microstructures containing chloroaluminates.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 85: Symposium M – Microstructural Development During Hydration of Cement , 1986 , 77
Copyright
Copyright © Materials Research Society 1987

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References

REFERENCES

1. ACI 306R-78 in ACI Manual of Concrete Practice, Part 2 (ACI, Detroit, 1978).Google Scholar
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