Process for producing low porosity cement

Details Process for producing low porosity cement Process for producing low porosity cement

C - Chemistry, Metallurgy

04

B

261/49, 261/57

C04B 28/02 (2006.01)

Patent

CA 1061808

A PROCESS FOR PRODUCING LOW POROSITY CEMENT Abstract of the Disclosure A method is disclosed for making low-porosity, free-flowing cement pastes with extended set times, improved workability and reduced expansion due to alkali aggregate reactions, by combining hydraulic cements, especially portland-type cements, ground without gypsum with from 0.1% to about 1.0% of an alkali or alkaline earth lignosulfonate or sulfonated lignin, combining 20% to 40% of water with 0.1% to 2.0% of an alkali bicarbonate, and thereafter mixing together the combined cement and lignin with the combined water and alkali bicarbonate. As an alternate embodiment of this process, the alkali or alkaline earth lignosulfonate or sulfonated lignin may be added to the water-bicarbonate rather than blended directly with the cement. These low-porosity pastes when mixed with aggregates produce mortars and concretes that have extended set times and are very workable during processing.

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