Process for producing low porosity cement

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

1975-04-21

1976-05-25

McCarthy, Helen M.

Compositions: coating or plastic

Coating or plastic compositions

Metal-depositing composition or substrate-sensitizing...

106 89, 106 90, 106104, 106117, 106118, 106119, 106123LC, 166293, C04B 735, C04B 7353

Patent

active

039590046

ABSTRACT:
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.

REFERENCES:
patent: 2646360 (1953-07-01), Lea
patent: 3689294 (1972-09-01), Brunauer
Orchard, D. F., Concrete Technology, Vol. 1, Properties of Materials (3rd. ed.), Pub. N.Y., Wiley and Sons, (1973), pp. 58-59, 66, 70-73.
Hansen, W. C., "Interactions of Organic Compounds in Portland Cement Pastes", J. Materials 5, (4), Dec. 1970, pp. 842-855.

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