Resistance of Fly Ash and Natural Pozzolans Blended Cement Mortars and Concrete to Carbonation, Sulfate Attack and Chloride Ion Penetration

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Title: Resistance of Fly Ash and Natural Pozzolans Blended Cement Mortars and Concrete to Carbonation, Sulfate Attack and Chloride Ion Penetration

Author(s): K. K. Sideris and A. E. Savva

Publication: Special Publication

Volume: 199

Issue:

Appears on pages(s): 275-294

Keywords: blended cements; carbonation; chloride resistance; fly ash; normal portland cement; pozzolans; sulfate resistance

Date: 6/1/2001

Abstract:
The durability of five mortar and concrete mixtures was investigated in this study. A normal portland cement and four blended cements incorporating different pozzolanic materials, two natural pozzolanas and two lignite fly ashes, were used. The properties measured were compressive strength development, sulfate and chloride resistance as well as the carbonation depth. The results available until the age of 1.5 years show that the replacement of normal portland cement by a pozzolanic material usually has beneficial effects on cement’s durability, especially when the sulfate resistance of mixtures is of primary interest. The carbonation depth of the pozzolanic mixtures was greater than the control’s at all ages up to 1.5 years. Among the four pozzolanic materials examined, the treated lignite fly ash from Ptolemaida gave the best performance in all the tests.