Ferrocement lining units, methods of making them and methods of

Details Ferrocement lining units, methods of making them and methods of Ferrocement lining units, methods of making them and methods of

1992-08-11

1994-10-25

Beck, Shrive

Coating processes

Spraying

427426, 427427, 2940209, 2940311, 2940218, 52382, 118300, 118308, B05D 102, B23P 600, E04B 116

Patent

active

053587510

ABSTRACT:
Ferrocement lining units are made by spraying aqueous cementitious compositions onto a wire mesh. Such lining units can be used for lining water courses, particularly underground sewers. Preferred cementitious compositions are based on cement powder, silica sand, water, optionally fly ash and possibly other minor additives. In making the lining units, steel wire mesh is supported in a mold and sprayed with the composition preferably by a particular form of gun (5) which is supplied with mortar and compressed air, as part of an overall apparatus that includes a pump (3) and an air compressor (6) which enable spray applications to be effected remotely from the mortar supply and preferably underground for the in-situ lining of sewers. The spray pattern of the gun is adjustable. Controlling the mortar supply and air pressure helps to reduce the problems associated with excessive spray formation and rebound of the applied mortar.

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