Influence of gypsum additive on the formation of calcium silicate hydrates in mixtures with C/S = 0.83 or 1.0

• Autorzy: Baltakys K.
• Języki publikacji: EN

Abstrakty

EN

The influence of gypsum additive on the formation of calcium silicate hydrates and on the formation of a sequence of intermediary compounds in the CaO-SiO2onH2O-H2O system has been examined. The synthesis was carried out in unstirred suspensions. The molar ratios of primary mixtures were CaO/SiO2 = 0.83, 1.0 and SO3/(SiO2 + SO3) = 0, 0.0125, 0.025. The durations of isothermal curing at 200 °C were 4, 8, 16 and 72 h. It was established that sulfate ions improve the synthesis of 1.13 nm tobermorite in the CaO-SiO2onH2O-H2O system with CaO/SiO2 = 0.83 at 200 °C. However, a larger amount of gypsum (SO3/(SiO2 + SO3) = 0.025) stimulates the formation not only of 1.13 nm tobermorite but also of CaSO4 and xonotlite. In the CaO-SiO2onH2O-H2O system with CaO/SiO2 = 1.0, a small amount of sulfate ions prolong the persistence of intermediate compounds - 1.13 nm tobermorite and C-S-H (I). The products of synthesis were characterized by X-ray diffraction analysis, simultaneous thermal analysis and Fourier transform infrared spectroscopy.

Słowa kluczowe

EN

gyrolite; calcium sulfate; calcium silicate hydrate; X-ray diffraction

• Wydawca: De Gruyter
• Czasopismo: Materials Science Poland
• Rocznik: 2009
• Tom: Vol. 27, No. 4/1
• Strony: 1091--1101
• Opis fizyczny: Bibliogr. 21 poz.

Twórcy

autor

Baltakys K.

• Department of Silicate Technology Kaunas University of Technology Radvilenu 19, LT - 50270 Kaunas, Lithuania

Bibliografia

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