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Microstructural Study of Aggregate/Hydrated Paste Interface in Very High Strength River Gravel Concretes

Published online by Cambridge University Press:  21 February 2011

Shondeep L. Sarkar ,
Yaya Diatta  and
Pierre-Claude Aïtcin
Shondeep L. Sarkar
Affiliation:
Department of Civil Engineering, Universitë de Sherbrooke, Sherbrooke (Quebec) JIK 2RI
Yaya Diatta
Affiliation:
Department of Civil Engineering, Universitë de Sherbrooke, Sherbrooke (Quebec) JIK 2RI
Pierre-Claude Aïtcin
Affiliation:
Department of Civil Engineering, Universitë de Sherbrooke, Sherbrooke (Quebec) JIK 2RI
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Abstract

The aggregate/hydrated paste interface represents the weakest link in very high strength river gravel concrete, due to the surface smoothness of these aggregates.

Microstructural examination of the aggregate/hydrated paste interface in four different (very low W/C ratio) very high strength concretes with and without silica fume shows major differences in the nature of the transition zone at the interface level. In the non-silica fume concretes, hydrated lime and ettringite are found quite exclusively at the interface, while in silica fume concretes, only C-S-H is observed.

The modulus of elasticity can be correlated to the compressive strength by the equation, , with a low correlation index (78%) for non-silica fume concrete, whereas in silica fume concrete it becomes MPa, with excellent correlation in ex of 95%.

These results can be explained by the nature of the aggregate/hydrated paste interface, which is stronger in silica fume concrete.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 114: Symposium R – Bonding in Cementitious Composites , 1987 , 111
Copyright
Copyright © Materials Research Society 1988

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References

REFERENCES

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