METHOD TO MANUFACTURE PROTECTIVE WEIGHTING CONCRETE COATING OF PIPELINE Russian patent published in 2015 - IPC C04B28/02 F16L58/06 C04B111/20 

FIELD: technological processes.

SUBSTANCE: invention relates to piping, namely, to materials applied onto the outer surface of pipes as a protective weighting coating. In the method to manufacture a protective weighting concrete coating of a pipeline, including mixing of cement, filler, plasticising additive and water, injection of the produced mix into the annular space created by the outer surface of the pipeline and a leave-in-place form installed on it with a gap, hardening of the produced coating, portland cement is supplied for mixing with account of its content in the mix from 8.8 wt % to 20.0 wt %, water is introduced in terms of water to cement ratio from 0.31 to 0.63, plasticising additive supplied for mixing is a plasticising agent and a defoaming agent in the amount of 1.0 kg/m³ to 3.0 kg/m³, the filler supplied for mixing with grain size not exceeding 10 mm is selected from barite or iron-containing ore, or gabbrodiabase, or granite in the mixture or separately, at the same time components are mixed to produce a mix having a flow index measured by flow equal to 55 - 75 cm, and the index of air content from 1% to 4% of the volume. The invention is developed in invention claims.

EFFECT: provision of density of a protective concrete material within 2600 - 3400 kg/m³.

3 cl, 2 tbl