Influence of slag chemistry on the hydration of alkali-activated blast-furnace slag — Part I: Effect of MgO

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

1,016 citations recorded by the source corpus.

The hydration and microstructural evolution of three alkali activated slags (AAS) with Al{sub 2}O{sub 3} contents between 7 and 17% wt.% have been investigated. The slags were hydrated in the presence of two different alkaline activators, NaOH and Na{sub 2}SiO{sub 3}{center_dot}5H{sub 2}O. The formation of C(-A)-S-H and hydrotalcite was observed in all samples by X-ray diffraction, thermal analysis and scanning electron microscopy. Higher Al{sub 2}O{sub 3} content of the slag decreased the Mg/Al ratio of hydrotalcite, increased the Al incorporation in the C(-A)-S-H and led to the formation of straetlingite. Increasing Al{sub 2}O{sub 3} content of the slag slowed down the early hydration and a lower compressive strength during the first days was observed. At 28 days and longer, no significant effects of slag Al{sub 2}O{sub 3} content on the degree of hydration, the volume of the hydrates, the coarse porosity or on the compressive strengths were observed.

Subfields: Civil and Structural Engineering, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/855ee5d93b22ef00dcd6439b850887cf4d14e1ba

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In Civil and Structural Engineering

  1. J. Provis
  2. S. A. Bernal
  3. Guang Ye
  4. N. Neithalath
  5. J. V. van Deventer
  6. Brant Walkley
  7. R. Myers
  8. M. Soutsos

In Materials Chemistry

  1. J. Provis
  2. S. A. Bernal
  3. J. V. van Deventer
  4. Guang Ye
  5. N. Neithalath
  6. Brant Walkley
  7. M. Soutsos
  8. R. Myers

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