ISSN: 0149-6123
Page Count: 6

Synergistic Roles of Slag and Silica Fume in Very High-Strength Concrete
Sarkar, S
Attaché de recherche, professeur titulaire, and graduate student, Faculté des Sciences Appliquées, Université de Sherbrooke, Quebec

Aitcin, P-C
Attaché de recherche, professeur titulaire, and graduate student, Faculté des Sciences Appliquées, Université de Sherbrooke, Quebec

Djellouli, H
Attaché de recherche, professeur titulaire, and graduate student, Faculté des Sciences Appliquées, Université de Sherbrooke, Quebec

Abstract

A very high-strength concrete (W/C = 0.20) containing 10% silica fume, 30% slag replacement for cement, and a high-range water-reducing admixture attained a compressive strength of 94 MPa at 28 days. The microstructural development of this concrete was studied from 1 to 28 days with SEM/EDXA and TEM. The slag used was reactive, with 70% melilite group phases and an index of hydraulicity of 1.2. Microstructural changes occurring in the first 28 days are presented. The factors responsible for promoting strength are also discussed.

Keywords:
very high-strength concrete, slag, silica fume, hydration, compressive strength, cement, aggregate, high-range water-reducing admixture, synergism, microstructure

Paper ID: CCA10386J
DOI: 10.1520/CCA10386J
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