Yarwun Unit 2 Pit Remediation

Project Details

Constructed in 2002 the Rio Tinto Yarwun alumina refinery sees approximately 3 million tonnes of alumina produced a year which is then shipped to various customers around the world.

As part of the refining process pits are used to collect caustic sludge which is then disposed of as regulated. Due to the corrosive nature of the material, the concrete walls and floor over time became fatigued exposing the reo bar and causing concrete cancer. Pructon was engaged to undertake the remediation works on the pit. This included the installation of steel plates and high strength Renderoc G grout to improve the longevity of the pit.

Further to this Pructon was responsible for the restoration of steel pipework back to its original state. Fabrication of the large bore pipework was undertaken at our Gladstone workshop and then was installed during a shutdown period. This meant the removal of all bypassing pipework and supports that were originally used to bypass the materials from the pit when concrete works were undertaken. Installation of new DN600, DN450 & DN400 piping make safe all handrails in the area. Similarly pipe supports were installed by Pructon. This work was undertaken during the major yearly digestion shutdown.


Rio Tinto


Gladstone, QLD

Year of Completion