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Only calcium silicates contribute to the strength. 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.
Calcium aluminate silicate hydrate AFt: C 6 A S 3 H 32, sometimes with substitution of Fe for Al, and/or CO 2− 3 for SO 2− 4: Calcium trisulfoaluminate hydrate, or ettringite: AFm: C 4 A S H 12, often with substitution of Fe for Al, and/or various other anions such as OH − or CO 2− 3 for SO 2− 4: Calcium monosulfoaluminate C 3 AH 6 ...
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.
Calcium silicate hydrate – Main product of the hydration of Portland cement (C-S-H) Cement chemist notation – Abbreviated notation for chemical formulas of common oxides (CCN) Energetically modified cement – Class of cements, mechanically processed to transform reactivity (EMC) Qadad – Old technique used in plastering walls and cisterns
The hydrate is referred to as the calcium silicate hydrate – "C-S-H-" – phase. It grows as a mass of interlocking needles that provide the strength of the hydrated cement system. High alite reactivity is desirable in Portland cement manufacture, and this is achieved by retaining, as far as possible, high temperature polymorphs, in crystals ...
Afwillite is one of the calcium silicate hydrates (C-S-H) that form when Portland cement sets to form hardened cement paste (HCP) in concrete. [10] The cement gets its strength from the hydration of tri- and di- calcium silicates (C 3 S and C 2 S) present in the clinker.
Calcium ions then react with the soluble sodium silicate gel to convert it into solid calcium silicate hydrates (C-S-H). The C-S-H forms a continuous poorly permeable coating at the external surface of the aggregate. The penetrated alkaline solution (NaOH / KOH) converts the remaining siliceous minerals into bulky soluble alkali silicate gel.
The product CaH 2 SiO 4 ·2 H 2 O is a calcium silicate hydrate, also abbreviated as C-S-H in cement chemist notation, the hyphenation denotes the variable stoichiometry. The atomic (or molar) ratio Ca/Si, CaO/SiO 2 , or C/S, and the number of water molecules can vary and the above-mentioned stoichiometry may differ.