Rare earth modifiers for Portland cement

Details Rare earth modifiers for Portland cement Rare earth modifiers for Portland cement

1984-05-15

1986-10-28

Dixon, Jr., William R.

Compositions: coating or plastic

Coating or plastic compositions

Metal-depositing composition or substrate-sensitizing...

106100, 106104, 106314, C04B 702

Patent

active

046197028

ABSTRACT:
Rare earth elements, added to the raw materials mixture fed to a cement kiln, produce cement compositions having increased early compressive strengths. Preparation of such cements requires less grinding of clinkers to achieve equivalent early strengths than similar compositions without the rare earth elements.

REFERENCES:
patent: 3649316 (1972-03-01), Uno et al.
patent: 3827982 (1974-08-01), Hall et al.
patent: 4087573 (1978-05-01), Holcombe, Jr. et al.
patent: 4148663 (1979-04-01), Holcombe, Jr.
patent: 4220475 (1980-09-01), Tokar et al.
W. Gutt and M. A. Smith, "Cerium as Minor Component in Cement Manufacture", Cement Technology, Jan., 1970, pp. 17-21.
P. F. Rumyantsev and Z. I. Skotnikonova, "Effect of Lanthanium Oxide on the Formation Kinetics and Properties of Cement Clinker", Foreign Technology Division Air Force Systems Command, FTD-HT-23-858-72.

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