Title: Influence of Mechanical Strength and Curing Methods on Sea water Durability of Mortars Containing Fly Ashes and Slag

Author(s): A. M. Paillere, G. Platret, P. Roussel, and J. Gawsewitch

Publication: Symposium Paper

Volume: 132

Issue:

Appears on pages(s): 179-204

Keywords: curing; durability; fly ash; mortars (material); porosity; seawater; slags; strength; superplasticizers; Materials Research

DOI: 10.14359/2045

Date: 5/1/1992

Abstract:
The behavior of mortars containing fly ashes and slag in seawater has been studied under two different exposure conditions. Examined first was whether the achievement of strengths at 28 days, either similar to or higher than those of reference mortars, would lead to mortars with a durability as high as in the case of reference mortars or even higher, due to the addition of superplasticizers and the substitution of fly ashes or slag for some cement quantities. Secondly, a cement portion issued from a reference mortar was replaced by corresponding fly ash and slag quantities, the E/C ratio and the workability being kept constant, and variations of the duration of humid curing were imposed to observe their influence on the behavior in seawater. Results obtained show that: a) the criterion of strength at 28 days does not allow a guarantee of the durability in seawater; b) the direct substitution, in the mortar, of fly ashes or slag, for a certain amount of cement (known in the French regulations as nonresistant to seawater) does not improve the long-term behavior; and c) the humid curing during 7 days is, by far, the best.