C - Chemistry – Metallurgy – 04 – B
Patent
C - Chemistry, Metallurgy
04
B
261/49, 261/58
C04B 7/02 (2006.01) C04B 7/32 (2006.01)
Patent
CA 1054638
ABSTRACT OF THE DISCLOSURE An early strength hydraulic cement comprises 7 to 90 per cent, usually 10 to 70 per cent, and preferably 15 to 30 per cent by weight of C12A7, the majority of the balance being hydraulic calcium silicates. The C12A7 phase is formed in an underlimed clinker burned to a low free lime below two per cent by weight. The underlimed condition is at least counterbalanced in the cement by the presence of a substance effective to in- crease the basicity of the composition, e.g. a metal oxide such as MgO or FeO present in the clinker-forming mix which enters into solid solution in the major phases in the clinker by sub- stituting for CaO in the lattices thereof or a suitable source of calcium ions added to the cement prepared from the underlimed clinker.
240812
Brown Arthur W.
Murray Ransom J.
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