Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Effect of internal sulfate attack on the properties of sulfate-resisting cement and alkali-activated slag
This work aims at studying the effect of internal sulfate attack on the properties of sulfate-resisting cement (SRC) and alkali-activated slag (AAS). Blast-furnace slag was activated by 3% sodium hydroxide (NaOH) and 3% sodium silicate (Na2SiO3) by weight of slag. Magnesium sulfate (MgSO4) solution with concentration of 0, 4, 12, and 20 wt.% was mixed with AAS and SRC at water to cement ratio (W/C) of .25. The results showed that the AAS setting times decrease with MgSO4%. As the MgSO4% increases up to 12%, the SRC setting times are elongated, and then shortened at 20%. The compressive strength of SRC decreases with the increase of MgSO4%. In contrast, the AAS compressive strength increases with MgSO4% up to 12%, then decreases at 20%. Drying shrinkage reduction and increment were observed when SRC and AAS were mixed with MgSO4. These results were confirmed by X-ray diffraction, Fourier transformer infrared spectroscopy, and thermogravimetric (TG/DTG) analyses. The results proved that, the AAS can be beneficially used in cement concrete containing high sulfate concentration with better performance than SRC.
Effect of internal sulfate attack on the properties of sulfate-resisting cement and alkali-activated slag
This work aims at studying the effect of internal sulfate attack on the properties of sulfate-resisting cement (SRC) and alkali-activated slag (AAS). Blast-furnace slag was activated by 3% sodium hydroxide (NaOH) and 3% sodium silicate (Na2SiO3) by weight of slag. Magnesium sulfate (MgSO4) solution with concentration of 0, 4, 12, and 20 wt.% was mixed with AAS and SRC at water to cement ratio (W/C) of .25. The results showed that the AAS setting times decrease with MgSO4%. As the MgSO4% increases up to 12%, the SRC setting times are elongated, and then shortened at 20%. The compressive strength of SRC decreases with the increase of MgSO4%. In contrast, the AAS compressive strength increases with MgSO4% up to 12%, then decreases at 20%. Drying shrinkage reduction and increment were observed when SRC and AAS were mixed with MgSO4. These results were confirmed by X-ray diffraction, Fourier transformer infrared spectroscopy, and thermogravimetric (TG/DTG) analyses. The results proved that, the AAS can be beneficially used in cement concrete containing high sulfate concentration with better performance than SRC.
Effect of internal sulfate attack on the properties of sulfate-resisting cement and alkali-activated slag
Abdel Gawwad, H. A. (Autor:in) / Abd El-Aleem, S. (Autor:in) / Faried, A. S. (Autor:in)
Geosystem Engineering ; 20 ; 195-206
04.07.2017
12 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Sulfate attack on alkali-activated slag concrete
| Tema Archiv | 2002
External sulfate attack on alkali-activated slag
| British Library Online Contents | 2013
Sulfate attack on alkali-activated slag concrete
| British Library Online Contents | 2002
Sulfate attack on alkali-activated slag concrete
| Online Contents | 2002
External sulfate attack on alkali-activated slag
| Online Contents | 2013