Materiales de Construcción, Vol 57, No 285 (2007)

Effect of kaolin treatment temperature on mortar chloride permeability


https://doi.org/10.3989/mc.2007.v57.i285.39

J. Torres
Universidad del Valle, Calí, Colombia., Colombia

R. Mejía de Gutiérrez
Universidad del Valle, Calí, Colombia., Colombia

F. Puertas
Instituto de Ciencias de la Construcción Eduardo Torroja (CSIC), Madrid, Spain

Abstract


The present paper discusses the results of chloride resistance tests conducted on ordinary Portland cement (OPC) mortars containing a Colombian kaolin pre-treated at temperatures of from 600 to 800 ºC. The resulting metakaolin (MK) was added to OPC mortar mixes in proportions of 10 and 20% by cement weight. The mortars were compared for physical and chemical properties, including capillary absorption, chloride permeability and pore microstructure as assessed by mercury porosimetry. The best performance was recorded for the samples containing 20% of the material treated at 800 ºC.

Keywords


metakaolin; mortars; durability; capillary absorption; chloride permeability

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