Tectoaluminosilicate cement and process for producing it

Details Tectoaluminosilicate cement and process for producing it Tectoaluminosilicate cement and process for producing it

C - Chemistry, Metallurgy

04

B

C04B 28/02 (2006.01) C04B 7/345 (2006.01) C04B 7/38 (2006.01) C04B 12/00 (2006.01) C04B 20/02 (2006.01) C04B 20/04 (2006.01) C04B 28/08 (2006.01)

Patent

CA 2072646

28 ABSTRACT A tectoaluminosilicate cement, containing K, Ca, and aluminosilicate as well as, where applicable, Li, Na, and Mg, characterized by a content of - at temperatures between 500°C and 900°C, dehydroxilated phyllosilicate - reactive silica - reactive calcium aluminosilicate glass with a Ca:Si ratio ? - alkali activator with the molecular formula (I): a(M2O) * x(SiO2) * y(H2O) (I) with M = Li, Na, K and a = 0-4, x = 0-5 and y = 3-20 in which the total Si:Al ratio is ? 1. Preferably, the tectoaluminosilicate cement contains at least one alkali hydroxide. The dehydroxilated phyllosilicate may be a metakaolin leading to the tectosilicate structures in the presence of alkali components. The reactive silica may be a dealuminated phyllosilicate, a silicic acid gel, a thermically alkali-activated aluminosilicate obtained by sintering an initial silicate with alkali carbonate at temperatures between 800°C and 1200°C, the alkali and aluminosilicate components being mixed in a ratio of from 1:6 to 1:1, and/or microsilica ("silica flume"). The alkali activator may arise in situ from the dealuminated phyllosilicate and/or silicic acid gel in the presence of alkali hydroxides. 29 A bonding matrix derived from the tactoaluminosilicate cement in a reaction with H2O in a ratio of from 3:1 to 6:1, characterized by the molecular formula: (Li,Na)0-7K1-6Mg1-0Ca3-0[Al4Si6-14O21-36] . (0-15H2O) (II).

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