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Calcium-silicate passive fire protection board being clad around steel structure in order to achieve a fire-resistance rating. Calcium silicate is commonly used as a safe alternative to asbestos for high-temperature insulation materials. Industrial-grade piping and equipment insulation is often fabricated from calcium silicate.
Dicalcium silicate is stable, and is readily prepared from reactive CaO and SiO 2 at 300 °C. The low temperature form is γ-belite, or lime olivine. This form does not hydrate, and is avoided in cement manufacture. As the temperature rises, it passes through several polymorphic states:
Tricalcium silicate is responsible for most of the early strength (first 7 days). [3] Dicalcium silicate, which reacts more slowly, only contributes to late strength. Calcium silicate hydrate (also shown as C-S-H) is a result of the reaction between the silicate phases of Portland cement and water.
Larnite is a calcium silicate mineral with the formula Ca 2 SiO 4.It is the calcium member of the olivine group of minerals.. It was first described from an occurrence at Scawt Hill, Larne, Northern Ireland in 1929 by Cecil Edgar Tilley and named for the location. [2]
Cement hydration and strength development mainly depend on two silicate phases: tricalcium silicate (C 3 S) , and dicalcium silicate (C 2 S) . [1] Upon hydration, the main reaction products are calcium silicate hydrates (C-S-H) and calcium hydroxide Ca(OH) 2, written as CH in the cement chemist notation. C-S-H is the phase playing the role of ...
The strength-developing phases are monocalcium aluminate (CA), dodeca-calcium hepta-aluminate (C 12 A 7), and belite (C 2 S), a dicalcium silicate. Calcium aluminoferrite ( C 4 AF ), monocalcium dialuminate ( CA 2 ), gehlenite , and pleochroite contribute little to the concrete strength .
MTA is composed mostly of tricalcium silicate, dicalcium silicate, tricalcium aluminate, and tetracalcium aluminoferrite, with calcium sulfate and bismuth oxide as minor constituents. [3] The later 4 phases vary among the commercial products available.
The ratio Ca/Si (C/S) and Mg/Si (M/S) decrease from 2 for the dicalcium and dimagnesium silicate reagents to 1.5 for the hydrated silicate products of the hydration reaction. In other term, the C-S-H or the serpentine are less rich in Ca and Mg respectively.