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Volume Relationships for C-S-H Formation Based on Hydration Stoichiometries

Published online by Cambridge University Press:  25 February 2011

J. Francis Young and
Will Hansen
J. Francis Young
Affiliation:
Departments of Civil and Ceramic Engineering, University of Illinois, Urbana, Illinois 61801
Will Hansen
Affiliation:
Department of Civil Engineering, University of Michigan, Ann Arbor, Michigan 48106
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Abstract

Volume changes can be calculated from the hydration stoichiometry of C3S if the composition of C-S-H is taken as C1.7SH4.0 with a density of 1.85 g/cm3. The results are in general agreement with the volume changes determined by Powers. However, the calculated evaporable water content is higher and the space-limiting water-cement ratio is calculated to be 0.42. The calculations can be applied also to the pozzolanic reaction and predict a marked increase in solid volume. In that case the composition of C-S-H is modified to C1.5SH3.8.

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References

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