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US 5,769,939 AGranted
Cement based injection grout
AssigneeElkem ASA
InventorsEldar O. Dings.o slashed.yr, Per Fidjest.o slashed.l, Oddny J.o slashed.rgensen
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Abstract
The present invention relates to a cement-based injection grout containing microcement and water for consolidation and/or waterproofing fine granular soils, finally fissured soils and cracks in rocks or concrete structures. In addition to microcement and water the grout contains amorphous silica particles in an amount of 5-70% based on the weight of cement and 0-10% water-reducing agents based on the weight of the cement, said grout having a weight ratio between water and cement+amorphous silica between 2 and 8.
Claims8
An injection grout comprising:
- (a) microcement;
- (b) water;
- (c) about 5 to 70% by weight of amorphous silica particles based on the weight of cement, said amorphous silica particles having about 60-100% by weight SiO.sub.2, a density between about 2.0 and 2.4 g/cm.sup.3, a surface area of about 10 m.sup.2 /g, and at least about 90% having a particle size of less than about 10 microns;
- (d) about 0 to 10% by weight of water reducing agents based on the weight of the cement;
- (e) said grout having a water to cement and amorphous silica weight ratio of between about 2 and 8;
- (f) said grout having a lower water separation than a comparable grout made with microcement and water without said amorphous silica particles;
- and
- (g) said grout having a higher penetration into a space into which said grout is injected than a comparable grout made with microcement and water without said amorphous silica particles.
5 more elements
Dependencies are inferred from the claim text.