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Microstructure and hydration characteristics of artificial pozzolana-cement pastes containing burnt kaolinite clay
The reaction of pozzolana with the lime liberated during the hydration process of Portland cement modifies some properties of cement and resulting concrete. This study aimed to investigate experimentally the change occurring in the phase composition and microstructure of pozzolanic cement pastes containing activated kaolinite clay. The artificial pozzolana (burnt kaolinite clay) were thermally activated by firing at 850 deg C for two hours. The OPC (ordinary Portland cement) was partially replaced by different amounts of activated kaolinite clay by weight. The changes in the electrical conductivity were reported during setting and hardening processes after gauging with water. The change occurring in the phase composition and microstructure of cement pastes were investigated by differential thermal analysis and scanning electron microscopy. The results of this investigation show that, the thermal activated kaolinite clay prolonged the initial and final setting times and reduced the porosity, it also improved the microstructure of the formed hydrates by recrystallization of hydrated calcium silicates (mainly as CaO-SiO2-H2O-(I)) together with the formation of hexagonal calcium aluminate hydrate (mainly as (4CaO)(Al2O3)(13H2O)).
Microstructure and hydration characteristics of artificial pozzolana-cement pastes containing burnt kaolinite clay
The reaction of pozzolana with the lime liberated during the hydration process of Portland cement modifies some properties of cement and resulting concrete. This study aimed to investigate experimentally the change occurring in the phase composition and microstructure of pozzolanic cement pastes containing activated kaolinite clay. The artificial pozzolana (burnt kaolinite clay) were thermally activated by firing at 850 deg C for two hours. The OPC (ordinary Portland cement) was partially replaced by different amounts of activated kaolinite clay by weight. The changes in the electrical conductivity were reported during setting and hardening processes after gauging with water. The change occurring in the phase composition and microstructure of cement pastes were investigated by differential thermal analysis and scanning electron microscopy. The results of this investigation show that, the thermal activated kaolinite clay prolonged the initial and final setting times and reduced the porosity, it also improved the microstructure of the formed hydrates by recrystallization of hydrated calcium silicates (mainly as CaO-SiO2-H2O-(I)) together with the formation of hexagonal calcium aluminate hydrate (mainly as (4CaO)(Al2O3)(13H2O)).
Microstructure and hydration characteristics of artificial pozzolana-cement pastes containing burnt kaolinite clay
Einfluß von gebranntem Ton auf Gefüge und Hydratisierungsverhalten von künstlichen Puzzolan-Zement-Pasten
Saad Morsy, M. (author) / Abo El-Enein, S.A. (author) / Hanna, G.B. (author)
Cement and Concrete Research ; 27 ; 1307-1312
1997
6 Seiten, 4 Bilder, 12 Quellen
Article (Journal)
English
Hydratisieren , Wasserabbinden von Zement , Kaolinit , Puzzolanzement , hydraulisches Bindemittel , Phasenzusammensetzung , Erhärten (Zementabbinden) , Calciumsilicathydrat , Calciumaluminathydrat , elektrische Leitfähigkeit , Mikrogefüge , Differenzialthermoanalyse , Beton , Ton (Mineral) , Metakaolin , Zementpaste
| British Library Online Contents | 1997
| British Library Online Contents | 1998