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US 4,196,922 AGranted
Bituminous composition
AssigneeThe British Petroleum Company p.l.c.
InventorsTerence R. J. Fabb, John V. Heyes
Life of this patent
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Abstract
A mastic asphalt suitable for coating underwater pipelines comprises 8-22% wt. bitumen, 8-25% wt. filler passing a 75 microns sieve, 84-53% wt. aggregate in the grading range from larger than 75 microns to a maximum particle size of from 2.36 to 37.5 mm., the aggregate having a grading curve close to a modified Fuller curve for particles of the maximum size chosen, the modified Fuller curve being the Fuller curve recalculated to exclude material passing 75 microns.
Claims10
A mastic asphalt pourable at temperatures in the order of 170.degree. C., suitable for coating pipelines, comprising
- 8-22% wt of bitumen having a penetration of from 10 to 100 at 25.degree. C. and a Ring and Ball softening point of from 40.degree. to 115.degree. C.;
- 8-25% wt of filler passing a 75 microns sieve;
- and
- 84-53% wt of aggregate in the grading range from larger than 75 microns to a maximum particle size of from 2.36 mm to 37.5 mm, the aggregate having a grading curve close to a modified Fuller curve for particles of the maximum particle size chosen, said modified Fuller curve being the Fuller curve recalculated to exclude material passing 75 microns.
1 more element
Dependencies are inferred from the claim text.