Abstract: A method of well construction or treatment comprising the introduction of a settable cement that contains pulverulent aplite down a borehole is provided, together with a cement composition comprising at least 30% by weight of cement pulverulent aplite on a dry solid basis.

Abstract: This invention provides a method of securing to a substrate a metal object having an uncoated surface, which method comprises contacting said substrate and said surface with an unset hydraulic cement composition and allowing said composition to set, characterized in that said surface is an aluminum surface and in that said composition comprises pulverulent aplite.

Abstract: The invention provides a method for cementing in a lining tube in a bore hole, said method comprising placing said lining tube at a distal end of said bore hole, introducing a liquid hydraulic cement containing a setting retarder into said distal end of said bore hole, and applying a fluctuating electromagnetic or magnetic field from within said lining tube whereby to heat cement outside said lining tube directly or via a electromagnetic radiation transmitter positioned on the outside of said lining tube.

Abstract: Buoyancy unit for use on a riser for sub sea applications, particularly for great depths, with a clamp 11 to be tensioned around the riser 16, and with a tensioning member 18 to damp the clamp 11. Buoyancy bodies 26, 27 are provided to engage with the clamp 11, said clamp 11 having at least one arched element 12-15 providing an annular structure to enclose the riser and to be pressed thereto with a tensioning strap 18. The buoyancy bodies 26, 27 are attached to the arched segments, The clamp 11 is cast from of a concrete material where at least the outer shell or layer is provided to prevent the intrusion of water, the casting of the clamp preferably containing powdered aplite.

Abstract: A cementitious composition comprising an hydraulic cement and one or more aggregates being added to or mixed with the cement and water. The cement contains more than 20 percent of weight micronized aplite.

Abstract: The invention provides a method of well construction or treatment which comprises introducing a setable cement composition down a borehole, characterized in that said composition contains pulverulent aplite. This abstract is intended as a scanning tool for purposes of searching in the particular art and is not intended to be limiting of the present invention.

Abstract: A construction element for protection of tunnels against fire, comprising two layers (12, 13) with different materials and material qualities, wherein one and outwardly oriented carrier layer (13) has a particularly high strength, while the other and inwardly oriented exposure layer (12) has a material composition adapted to meet particular application-specific conditions, such as high heat. The carrier layer (13) contains aplite as the main cementing agent, and a mat-shaped reinforcement material (14) is embedded in the area between the carrier layer (13) and the exposure layer (12).

Abstract: Container for storing environmental dangerous materials, particularly for lasting deposit of nuclear waste material. The container is cast of a mineral material, particularly concrete. The container has a restricted opening (12) provided for inserting a closing plug (34). The container is prepared as an integral element without material transitions or seams. It has recesses or knobs (16) in the inner wall.

Abstract: Buoyancy unit for use on a riser for sub sea applications, particularly for great depths, with a clamp 11 to be tensioned around the riser 16, and with a tensioning member 18 to damp the clamp 11. Buoyancy bodies 26, 27 are provided to engage with the clamp 11, said clamp 11 having at least one arched element 12-15 providing an annular structure to enclose the riser and to be pressed thereto with a tensioning strap 18. The buoyancy bodies 26, 27 are attached to the arched segments, The clamp 11 is cast from of a concrete material where at least the outer shell or layer is provided to prevent the intrusion of water, the casting of the clamp preferably containing powdered aplite.