Cement substitution by organoclay – The role of organoclay type

In this paper three organically modified clays (OC) with different functional group of modifier and basal spacing (d001) but approximately the same alkyl chain length were considered in order to identify which parameter of OC is the most characteristic for the selection of appropriate OC for cement...

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Bibliographic Details
Published in:Cement & concrete composites 2015-09, Vol.62, p.90-96
Main Authors: Kalpokaitė-Dičkuvienė, Regina, Lukošiūtė, Irena, Čėsnienė, Jūratė, Brinkienė, Kristina, Baltušnikas, Arūnas
Format: Article
Language:English
Subjects:
Cement
Gel pores
Nitrogen sorption
Organoclay
Strength
Water absorption
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Summary:In this paper three organically modified clays (OC) with different functional group of modifier and basal spacing (d001) but approximately the same alkyl chain length were considered in order to identify which parameter of OC is the most characteristic for the selection of appropriate OC for cement substitution. Compressive strength and water absorption changes in hardened cement paste due to partial cement substitution by OC at various dosages (0.5 up to 6wt%) and at water-to-solid ratios (0.27, 0.31 and 0.36) were examined. Microstructural changes evaluated by nitrogen sorption indicated that pore size distribution and especially micro and mesopores representing C–S–H structure have been much more affected by the type of modifier than the d001 of OC. Results showed that application of OC of the same d001, but having different functional group of modifier may result in either significant increment or reduction of the strength.
ISSN:0958-9465
1873-393X
DOI:10.1016/j.cemconcomp.2015.04.021