Effect of n-CaCO 3 and metakaolin on hydrated Portland cement

  1. Get@NRC: Effect of n-CaCO 3 and metakaolin on hydrated Portland cement (Opens in a new window)
DOIResolve DOI: http://doi.org/10.1680/adcr.11.00010
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Journal titleAdvances in Cement Research
Pages211219; # of pages: 9
SubjectBinary blends; Control samples; Ettringites; Hydration activity; Isothermal conduction calorimetries; Metakaolins; Nanoparticle addition; Ordinary Portland cement; Secondary phase; Secondary phasis; Supplementary cementing materials; Ternary blends; Calcium carbonate; Nanoparticles; Portland cement; Thermogravimetric analysis; X ray diffraction; Hydration
AbstractThe effect of calcium carbonate nanoparticles (nCaCO 3) on the hydration of ordinary Portland cement (OPC) blended with metakaolin was studied through comparison with OPC, OPC plus metakaolin and OPC plus nCaCO 3 control samples. Isothermal conduction calorimetry measurements showed that the hydration of the ternary OPC-metakaolin-nCaCO 3 blend had pronounced early secondary phase hydration activity compared to the controls. X-ray diffraction and thermogravimetric analysis identified the phases as calcium aluminosulfates, with both ettringite and monosulfate forming more quickly in the ternary blend than in the other samples. The presence of the nCaCO 3 also enhanced the formation of C 3A. CaCO 3. 12H 2O in both blends that contained it. The presence of the secondary phases or the nCaCO 3 itself was associated with a significant reduction in strength in the ternary blend as compared to the OPC-metakaolin binary blend. The results suggest that caution is needed in the development of concrete with nanoparticle additions in order to avoid detrimental combinations of nanoparticles, OPC and supplementary cementing materials. © 2012 Thomas Telford Ltd.
Publication date
AffiliationNational Research Council Canada (NRC-CNRC); NRC Institute for Research in Construction (IRC-IRC)
Peer reviewedYes
NPARC number21269269
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Record identifier5f7b9a6d-ff52-4f5b-8c60-6c68c7b877c3
Record created2013-12-12
Record modified2016-05-09
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