Client: Pulp & Paper Plant

Application Date: Q3, 2017

Problem
After years of service the cementitious substrate
was acidified following for an acid-base reaction
to occur beneath the previous repairs due to
ground moisture and led to repeated failure. The
client requested that the restoration work be
planned around normal operations and come with
a stout warranty.

Preparation
The containment was first thoroughly water blasted
with 40k psi equipment incorporating a salt remover
to expose all areas weakened by acidification and
remove soluble sulfur salts. This was followed by
grinding and cutting to allow for proper forming and
placement of Epoxy Polymer Concrete. The bottom of
the tank was mechanically prepared with power tools
and treated to remove soluble sulfur compounds.
Prior to priming the cementitious surfaces were
treated to return to alkalinity and ensure integrity of
the concrete.

Restoration

The curbs and surface were restored to their original
dimensions using Corrocoat Epoxy Polymer Concrete
in conjunction with normal forming. Once the
concrete was cured and the form removed, all
transitions from grade to vertical were laminates,
including from the tank pedestal onto the tank walls
to protect the underside of the tank floor from
releases. 

Protection
Upon hardening the fibreglass was hand sanded and
solvent cleaned prior to applying Plasmet AR3 in 3
successive coats to provide a film of 40-48 mils.
Plasmet AR3 is equally resistant to caustics and acids
and is approved by FDEP for mineral acid
containment applications.

Materials
– Plasmet ECP
– Corrocoat EPC
– Plasmet ZF
– Corrocoat ELR
– Plasmet AR3