Glebe Island Silos

The task was to strengthen 4 silos to enable them to be filled with cement.

The existing silos were designed for grain only strong enough to be half-filled.

Special Challenge

Cement Australia run a very tight OH&S regime because of the inherent safety risks in working in an operating industrial cement storage facility.

The silos had to be cleared of existing compacted cement and cement dust prior for personnel working internally in the silos.

An access door had to be cut into the silos above the concrete base to allow access for the steel fixers, form workers and concreters.


Main Silos

  • Andersal designed a special “helicopter” to air blast the silos from top to bottom to remove compacted cement from the silo walls.
  • Manually shovel 50 to 100 tonne of dry contracted cement powder from each silo.
  • Use a crusher to break up the hardened lumps so the product could be recycled.
  • Removed the 16 air slides from the base of each silo to clean them and to prevent damage.
  • Cut an access door hatch into the silo and erect an access platform.
  • Construct a 4m high x 300mm thick reinforced concrete ring internally in the base of each silo.
  • The new ring was anchored to the existing by dowels epoxied into the existing. These dowels then had 2 layers of s16 circumferential and vertical steel reinforcement installed followed by form work and pouring of the internal annulus.
  • Following concrete cure the form work was removed and the access opening reinforced using rebar continuity couplers and then concreted up.
  • Painting the exterior to restore it to its heritage conformity.
  • We completed 4 silos in 6 months.
  • In total about 200 cubic metres of concrete was used.


  • Construct 2 new footings per silo.
  • Reinforce 8 existing footings with 6 layers of Carbon Fibre. Each layer gave the equivalent strength of 50mm of concrete.

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