Buoyancy control material for subsea main pipelines and high-density buoyancy control material for subsea main pipelines

The buoyancy control material for subsea main pipelines, said material comprising:

• a cement,
• a filler,
• a plasticizing agent,
• a water, wherein said cement is further defined by a sulfate-resisting portland cement, said plasticizing agent is further defined by a polycarboxylate-ester-based plasticizing agent, and said filler is further defined by at least one of barite middling product, barite ore, and ferro-manganese concentrate having a component ratio as follows, % wt:
• said portland cement from 8.2 to 10.5, said water from 5.2 to 6.7, said plasticizing agent from 0.1 to 0.15.

The high-density buoyancy control material for subsea main pipelines, comprising:

• a cement,
• a filler,
• a plasticizing agent,
• a water, wherein said cement is further defined by a sulfate-resisting portland cement, barite ore and ferro-manganese concentrate are used as a filler having a component ratio as follows, % wt:
• portland cement
• from 9.2 to 10.5.
• water
• from 4.0 to 5.5.
• plasticizing agent
• from 0.05 to 0.18.
• barite ore from 3 to 17 having a density from 3.9 to 4.1 kg/cm3,
• ferro-manganese concentrate from 69 to 82 having a density from 4.2 to 4.5 kg/cm3,
• with a water-portland cement ratio from 0.35 to 0.5
• and a grain-size composition of filler components as follows:
• from 0.16 mm—up to 3%,
• from 0.16 to 1.0 mm—up to 27%,
• from 1.0 to 2.5 mm—up to 34%
• from 2.5 to 5.0 mm—the rest.