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Activation of ground granulated blast furnace slag cement by calcined alunite
To enhance the early strength of grounded granulated blast furnace slag (GGBFS) blended cement, the activation characteristics of GGBFS were examined by a potassium aluminum buliate (PSA) clinker, consisting of KAl(SO4)2 and amorphous Al2O3 by calcining alunite [K2SO4 Al2(SO4)3 4Al(OH)3] at 650 deg C for 30 min. The PSA clinker reacted with calcium hydroxide and gypsum to form ettringite (3CaO-Al2O3-3CaSO4-32H2O, AFt) by following reaction: 2KAl(SO4)2 + 2Al2O3 + 13Ca(OH)2 + 5(CaSO4 2H2O) + 74H2O -> 3(3CaO Al2O3 3CaSO4 32H2O) + 2KOH. Mortar was prepared by mixing a blended cement of GGBFS and ordinary Portland cement (OPC) with PSA clinker as activator. The compressive strength of the GGBFS blended cement mortar was compared with that of OPC mortar. When the PSA clinker and gypsum activator was added to the blended cement of GGBFS and OPC, the hydration products investigated by DTA and Xray diffraction were mainly ettringite and calcium silicate hydrate(C-S-H) gel. The early and long-term strengths of the GGBFS blended cement were higher than those of OPC. Therefore, PSA clinker as activator was shown to improve the early and long-term strengths of GGBFS blended cement.
Activation of ground granulated blast furnace slag cement by calcined alunite
To enhance the early strength of grounded granulated blast furnace slag (GGBFS) blended cement, the activation characteristics of GGBFS were examined by a potassium aluminum buliate (PSA) clinker, consisting of KAl(SO4)2 and amorphous Al2O3 by calcining alunite [K2SO4 Al2(SO4)3 4Al(OH)3] at 650 deg C for 30 min. The PSA clinker reacted with calcium hydroxide and gypsum to form ettringite (3CaO-Al2O3-3CaSO4-32H2O, AFt) by following reaction: 2KAl(SO4)2 + 2Al2O3 + 13Ca(OH)2 + 5(CaSO4 2H2O) + 74H2O -> 3(3CaO Al2O3 3CaSO4 32H2O) + 2KOH. Mortar was prepared by mixing a blended cement of GGBFS and ordinary Portland cement (OPC) with PSA clinker as activator. The compressive strength of the GGBFS blended cement mortar was compared with that of OPC mortar. When the PSA clinker and gypsum activator was added to the blended cement of GGBFS and OPC, the hydration products investigated by DTA and Xray diffraction were mainly ettringite and calcium silicate hydrate(C-S-H) gel. The early and long-term strengths of the GGBFS blended cement were higher than those of OPC. Therefore, PSA clinker as activator was shown to improve the early and long-term strengths of GGBFS blended cement.
Activation of ground granulated blast furnace slag cement by calcined alunite
Aktivierung von granuliertem Hochofen-Bodenschlackenzement mittels claciniertem Alunit
Kim, Hyung-Seok (author) / Park, Joo-Won (author) / An, Yong-Jun (author) / Bae, Jong-Soo (author) / Han, Choon (author)
Materials Transactions ; 52 ; 210-218
2011
9 Seiten, 12 Bilder, 8 Tabellen, 28 Quellen
Article (Journal)
English
Activation of Ground Granulated Blast Furnace Slag Cement by Calcined Alunite
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