Patent ID: 11939262
Assignee: HEUNGKUK IND.CO., LTD.
Field: Materials, metallurgy (Chemistry)
Classification: CPC C  Y | IPC C

Claim 0:
1. A method for manufacturing geopolymer foam with coal ash, the method comprising the steps of:
(1) mixing water glass (Na2SiO3) and sodium hydroxide (NaOH) to prepare an alkali activator;
(2) adding silica fume as blowing agent to the alkali activator and stirring the same;
(3) pulverizing coal bottom ash;
(4) mixing the coal bottom ash with coal fly ash to prepare coal ash;
(5) adding the mixture of silica fume and the alkali activator to the coal ash and then further adding the alkali activator to adjust a ratio of alkali activator/solid material comprising the coal ash and the silica fume, followed by mixing the same;
(6) loading and sealing the mixture in a mold to prepare a specimen;
(7) curing the specimen in an oven; and
(8) exposing to a temperature of as high as 200° C. to 600° C. for 2 hours the specimen that has completely undergone the curing,
wherein the coal fly ash is contained in an amount of 10 to 50% by weight based on the total weight of the coal bottom ash and the coal fly ash in step (4),
wherein the ratio of alkali activator/the solid material comprising the coal ash and the silica fume ranges from 0.38 to 0.50 in step (5).