METHOD OF LUBRICATION OF CONDUITS FOR CEMENTITIOUS SLURRIES

摘要

A method of lubrication of the passage of a cementitious composition through a conduit, comprising the addition to the conduit prior to addition thereto of the cementitious composition of an aqueous solution of a solid lubricating composition consisting essentially of (i) an alkali metal carbonate or bicarbonate, (ii) poly(ethylene oxide), and (iii) anionic sulphate surfactant. The use of this composition allows the convenient achievement of flow, without the necessity to mix sometimes substantial quantities of cement slurry in situ.