Raymond International
has developed the application of calcium aluminate based
products to waste water networks. This can be applied to new
installations at the manufacturing plant, in-situ after the
pipes have been laid or in a stack yard adjacent to the
project prior to laying.
It
is now proven that bacterial corrosion is one of the main
causes of deterioration of sewerage networks, regardless of
climatic conditions. Hydrogen sulphide (H2S) released by
effluents is transformed into sulphuric acid by the bacterial
micro-flora on the damp walls of the pipes.
Tests have
demonstrated that calcium aluminate
mortars and concretes
are one of the rare materials that offer high durability in
the presence of bacterial corrosion as well as providing
resistance against abrasion, the other major cause of network
deterioration. Tests have demonstrated this in internal
linings of new pipes, mass concrete used for pipes, or in
rehabilitation.
This system has proven very
successful with the rehabilitation of existing sewer networks
which have been subject to H2S attack.
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