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Prediction of the basic creep of concrete with high substitution of Portland cement by mineral additions at early age
Author(s) -
Delsaute Brice,
Torrenti JeanMichel,
Staquet Stéphanie
Publication year - 2021
Publication title -
structural concrete
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.912
H-Index - 34
eISSN - 1751-7648
pISSN - 1464-4177
DOI - 10.1002/suco.201900313
Subject(s) - portland cement , creep , ground granulated blast furnace slag , materials science , slag (welding) , cement , composite material , shrinkage , metallurgy
The present work analyses the basic creep of concrete compositions for which 75% of Portland cement is substituted by limestone filler and/or blast furnace slag. Compressive creep tests are performed during and after the peak of hydration of the slag in order to track the effect of the slag on the development of the creep properties. An adapted version of the Model Code 2010 (MC2010) is used to model basic creep. It is observed that the high substitution rate of cement by limestone filler and/or slag leads to a significant change in the evolution of the viscoelastic properties of concrete till a significant degree of reaction of slag is reached. It corresponds to the end of the second peak of hydration due to slag. After the slag peak of hydration, the basic creep is similar to ordinary Portland cement concrete with equivalent water‐to‐binder ratio. For very early age, a new model is developed and is composed of two terms, which consider the hydration of (a) Portland cement and (b) slag in the aging of the specific creep function.