Influence of activator type on hydration kinetics, hydrate assemblage and microstructural development of alkali activated blast-furnace slags

By Mohsen Ben Haha, G. Saoût, F. Winnefeld, B. Lothenbach. 2011

961 citations recorded by the source corpus.

Abstract The hydration of two slags with different Al 2 O 3 contents activated with sodium hydroxide and hydrous sodium metasilicate (commonly named water glass) is studied using a multi-method approach. In all systems, C-S-H incorporating aluminium and a hydrotalcite-like phase with Mg/Al ratio ~ 2 are the main hydration products. The C-S-H gels present in NaOH activated pastes are more crystalline and contain less water; a calcium silicate hydrate (C-S-H) and a sodium rich C-N-S-H with a similar Ca content are observed at longer hydration times. The activation using NaOH results in high early strength, but strength at 7 days and longer is lower than for the sodium metasilicate systems. The drastic difference in C-S-H structure leads to a coarser capillary porosity and to lower compressive strength for the NaOH activated than for the sodium metasilicate activated slags at the same degree of slag reaction.

Subfields: Building and Construction, Civil and Structural Engineering, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/648414db3bbe9e50ad16dec7a5b755123a81478e

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Citations in the corpus

Strength and drying shrinkage of reactive MgO modified alkali-activated slag paste (2014, neutral): “The total weight loss (indicating chemically bound water content) and the bound water content in C–S–H are often used as a measurement of the hydration extent of blended cements with slags [10,62,63].”