A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Influence of amorphous silica on the hydration in ultra-high performance concrete
Amorphous silica particles (silica) are used in ultra-high performance concretes to densify the microstructure and accelerate the clinker hydration. It is still unclear whether silica predominantly increases the surface for the nucleation of C–S–H phases or dissolves and reacts pozzolanically. Furthermore, varying types of silica may have different and time dependent effects on the clinker hydration. The effects of different silica types were compared in this study by calorimetric analysis, scanning and transmission electron microscopy, in situ X-ray diffraction and compressive strength measurements. The silica component was silica fume, pyrogenic silica or silica synthesized by a wet-chemical route (Stoeber particles). Water-to-cement ratios were 0.23. Differences are observed between the silica for short reaction times (up to 3 days). Results indicate that silica fume and pyrogenic silica accelerate alite hydration by increasing the surface for nucleation of C–S–H phases whereas Stoeber particles show no accelerating effect.
Influence of amorphous silica on the hydration in ultra-high performance concrete
Amorphous silica particles (silica) are used in ultra-high performance concretes to densify the microstructure and accelerate the clinker hydration. It is still unclear whether silica predominantly increases the surface for the nucleation of C–S–H phases or dissolves and reacts pozzolanically. Furthermore, varying types of silica may have different and time dependent effects on the clinker hydration. The effects of different silica types were compared in this study by calorimetric analysis, scanning and transmission electron microscopy, in situ X-ray diffraction and compressive strength measurements. The silica component was silica fume, pyrogenic silica or silica synthesized by a wet-chemical route (Stoeber particles). Water-to-cement ratios were 0.23. Differences are observed between the silica for short reaction times (up to 3 days). Results indicate that silica fume and pyrogenic silica accelerate alite hydration by increasing the surface for nucleation of C–S–H phases whereas Stoeber particles show no accelerating effect.
Influence of amorphous silica on the hydration in ultra-high performance concrete
Oertel, Tina (author) / Helbig, Uta (author) / Hutter, Frank (author) / Kletti, Holger (author) / Sextl, Gerhard (author)
Cement and Concrete Research ; 58 ; 121-130
2014
10 Seiten, 34 Quellen
Article (Journal)
English
Influence of amorphous silica on the hydration in ultra-high performance concrete
| British Library Online Contents | 2014
Influence of amorphous silica on the hydration in ultra-high performance concrete
| Online Contents | 2014
Amorphous silica in ultra-high performance concrete: First hour of hydration
| Tema Archive | 2014
Amorphous silica in ultra-high performance concrete: First hour of hydration
| British Library Online Contents | 2014
Amorphous silica in ultra-high performance concrete: First hour of hydration
| Online Contents | 2014