| 摘要 |
PCT No. PCT/EP91/01607 Sec. 371 Date Jun. 9, 1992 Sec. 102(e) Date Jun. 9, 1992 PCT Filed Aug. 24, 1991 PCT Pub. No. WO92/04300 PCT Pub. Date Mar. 19, 1992.A tectoaluminosilicate cement which consists of K, Ca and aluminosilicates plus, optionally, Li, Na and Mg, contains: a phyllosilicate dehydroxylated at a temperature between 500 DEG and 900 DEG C., reactive amorphous silica, reactive calcium silicate glass or reactive calcium aluminosilicate glass with a Ca:Si ratio of >/=1 and alkali silicate with the total formula: a(M2O) * x(SiO2) * y(H2O) in which M=Li, Na or K, a=0-4, x=0-5 and y=3-20, the overall Si:Al ratio being >/=1. The tectoaluminosilicate cement preferably alkali hydroxide. The dehydroxylated phyllosilicate is a metakaolin giving tectosilicate structures. The reactive amorphous silica is a dealuminated phyllosilicate, a fly ash dealuminated with mineral acids, where applicable, a fine-grained crystalline form of SiO2 contained in calcinated clays, a silicic acid gel, thermally activated by alkali-activated aluminosilicate, obtained by sintering an aluminosilicate with alkali carbonate at a temperture between 800 DEG and 1,200 DEG C., the alkali and aluminosilicate components being mixed in the ratio 1:6 to 1:1, and/or microsilica ("silica fume"). The alkali metal activator may be prepared in situ from the dealuminated phyllosilicate and/or from the silicic acid gel in the presence of the alkali hydroxide. A bonding matrix obtained from the tectoaluminosilicate cement by reacting with water in the ratio 3:1 to 6:1 consists essentially of the formula: (Li, Na)0-7K1-6Mg1-0Ca3-0[Al4Si6-14O21-36].(0-15H2O). |
