Cementitious composition and making concrete therefrom
AssigneeBlue Circle Industries PLC and ALH Systems Limited
InventorsGavin C. Gartshore, Norman E. Holme
Life of this patent
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Abstract
A cementitious composition comprises a ground sulfoaluminous clinker, a ground Portland cement clinker (preferably rapid hardening Portland cement clinker), calcium sulfate, aggregate (especially sand and a coarse aggregate such as granite) and metal (e.g. stainless steel) fibers. The composition may also comprise a plasticizer and agents for controlling setting and hardening. The reinforced concrete produced from the compositions is useful in offshore applications, e.g. as a coating for the weld areas between lengths of steel pipe to be laid under water.
Claims16
A cementitious composition, which consists essentially of (a) a ground sulfoaluminous cement clinker;
- (b) 1 to 5 parts by weight, per part by weight of component (a), of a ground Portland cement clinker having a fineness equivalent to a specific surface of at least 450 m.sup.2 /kg;
- (c) 0.25 to 0.5 part by weight, per part by weight of component (a), of calcium sulfate;
- (d) 1 to 4 parts by weight, per part by weight of component (a), of fine aggregate and 4 to 8 parts by weight, per part by weight of component (a), of coarse aggregate;
- (e) ferrous metal fibre in an amount of 1 to 5%, by weight, of the total composition on a dry weight basis;
- (f) a plasticizer in an amount of from 0.25 to 1% by weight of the total composition on a dry weight basis;
- (g) a hardening or setting accelerator in an amount of up to 5% by weight of the composition on a dry weight basis;
- and (h) a set-controlling agent in an amount of 0.01 to 0.02% by weight of the total composition on a dry weight basis.
Dependencies are inferred from the claim text.