Method for manufacturing a protective concrete weight coating for pipelines

A method for manufacturing a protective concrete weight coating for pipelines said method comprising the steps of:

• mixing cement, aggregate, a plasticizing additive and water, wherein lignosulfonates, melamine sulfonates and naphthalene sulfonates are applied as the mixture plasticizer separately;
• pumping the resultant mixture the cement, aggregate, the plasticizing additive and the water into an annular space formed by the outer surface of a pipeline and a permanent form mounted with clearance thereon, and setting the resultant costing, wherein a portland cement is supplied for mixing in an amount such that the mixture contains from 8.8 wt. % to 20.0%, water is added in an amount such that the ratio of water to cement is from 0.31 to 0.63, the plasticizing additive, in the form of a plasticizer and a defoamer, is supplied for mixing in an amount of from 1.0 kg/m3 to 3.0 kg/m3 , the aggregate supplied for mixing is selected from barium ore or an iron-bearing ore, or gabbro-diabase, or granite, with particle size not exceeding 10 mm, the resultant concrete mixture has a flow behaviour index, measured by the slump of a cone, which is equal to from 55 cm to 75 cm, and an air content of from 1% to 4% of the volume, and the aggregate of mixture has the following particle size distribution:
• up to 0.16 mm—up to 8%,
• from 0.16 mm to 1.25 mm—up to 35%,
• from 1.25 mm to 2.5 mm—up to 37%,
• from 2.5 mm to 10.0 mm—the rest.