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1 Materials Science Poland

1 2009

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Formation and stability of C-S-H (I) of various degrees of crystallinity in the Ca(OH)2/CaO-Hi-Sil-H2O system

Baltakys K., Jauberthie R.

Materials Science Poland

2009

Vol. 27, No. 4/1

1077--1089

The stability and crystal morphology of C-S-H (I) in the CaO/Ca(OH)/2-Hi-Sil-H2O systems and a sequence of formation of the intermediary compound has been examined. Two series of samples, with different ratios of CaO to SiO2were used in the experimental tests. The molar ratio CaO/SiO2 of primary mixtures was 1.0. Hydrothermal synthesis was carried out under the saturated steam pressure at temperatures of 90, 110, 130, 150 and 175 °C; the duration of isothermal curing was 2-72 h. It was determined that an increase of temperature significantly influences the stability, morphology and degree of crystallinity of C-S-H (I). It was found that C-S-H (I) is stable in the ranhe 90-130 °C. The overall morphology of C-S-H varies from the common fibrous type to irregular grains forming a reticular network. The compositions of intermediate products and of final products can be changed by adding calcium containing components (Ca(OH)2, CaO). In the mixtures with Ca(OH)2, an intermediate compound is C-S-H (I) and the final product is xonotlite. Meanwhile, in the mixtures with CaO, the main intermediate compounds are Z phase and C-S-H (I), and the main product is gyrolite.