Fortec was engaged by Aqwest to perform micro fine
cement grouting works to a 79 million litre water tank as part of their Tech Reservoir Refurbishment Stage 3.


Tech Reservoir is Aqwest’s largest water storage reservoir and had a history of leakage. Leakage of water came through voids in the limestone fill which necessitated pattern grouting across floor slab and batters to stabilise the foundation.

The grouting works included:

  • Setting up grout station with Chemgrout GG-600 Colloidal Mixer.
  • Running grout hoses approximately 200m from mixer to point of discharge with return lines.
  • Driving and flushing spears into ground.
  • Injection of a fluid grout to produce a solidified mass, thereby filling voids and soft/loose zones underneath the floor of the reservoir.
  • Reinforcing soil materials underneath the reservoir floor to form a pattern of grout columns.
  • Providing watertight repairs to core holes drilled for grouting and investigation purposes.
  • Grouting beneath roof support columns.


  • Working in the restricted environment of a tank.
  • By the completion of the project 85,000 litres of microfine grout injection and 7,500 of GP grout injection had been installed.


  • Drilling & Grouting

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