Expando Articles

Energex - Removal Of A Concrete Slab

John Rothwell Director of No Blast Pty Ltd - Tuesday, August 05, 2014

When I was contacted by Adam Philippini, the Construction Coordination Officer for Energex (an Australian energy provider) to remove a concrete plinth from their basement yard, I knew that Expando Explosive Mortar was the perfect solution for the job.

The concrete plinth needing removal was being used as a base for a transformer, the slab itself was approximately 1 metre thick by 3 metres wide and 10 metres long.

Given the location and size of the plinth, removal was not going to be a straight forward demolition job, this is one of the reasons that Expando was an excellent choice.

The slab was between two buildings where there could be no vibrations, minimal dust and no airborne concrete chips, this mean that traditional demolition methods such as  pounding the concrete with an evacuator was not an option.

After researching alternative solutions, Energex decided to use the unique non explosive demolition method that Expando Expansive Mortar provides, it was also chosen due to the cost saving provided over other demolition options.

To carry out the concrete demolition, Energex loaded Expando SCA-2 into holes drilled 38mm wide, approximately 450mm apart and around 850mm deep. 

The chemical started to crack the slab early on the second day after application, the weather was warm which helps with a quicker concrete burst.

To further speed the process and to ensure the reinforcing was cut, Energex decided to run diamond saw cuts along the slab, as you can see however in the images below, these cuts were not necessary as the job was completed entirely by the chemical expansion.

Expando Expansive Mortar ensured a safe and effective means of demolishing the concrete slab, with none of the usual concerns that need to be considered with demolition in a busy area.

Energex have been very happy with the result and will continue to use Expando in future jobs. 

Tunnelling a horizontal shaft through Sydney Sandstone

John Rothwell Director of No Blast Pty Ltd - Monday, October 31, 2011

We are now involved in a small residential tunneling project in North Sydney. The owner is in his early 70s and knows that in the future the 38 steps from his gate to his door are going to become a really big obstacle. The project is to cut a tunnel through the rear of the garage under the front lawn and then under the existing lounge room, where a small elevator shaft will connect the vertical shaft to the horizontal tunnel under the front lawn. The project has been a hobby for the former mining engineer.

Due to the cost and time taken to excavate the first five meters of the tunnel we have been engaged to help. The challenge has been to fill horizontal and vertical holes using the chemical Expando. We initially used a grout pump to fill the horizontal holes but the cost of hiring was too expensive for this residential job so we came up with an alternative method.

We have been filling long skinny bags with the chemical Expando and forcing the bags into the horizontal holes using a PBC pipe and Timber ream it has had the same effect as if we had poured it into the holes from the top.

We are now far enough under the house that we can start cutting in the vertical shaft .Holes have been drilled up from the lower tunnel and as we remove the rock from the top we can simply drop it down the hole to be cleaned out through the garage. 

(Click on the images to make them larger)

Expando - Ideal for building green

John Rothwell Director of No Blast Pty Ltd - Sunday, September 04, 2011

Explosive blasting, ignition of dangerous gases and heavy equipment - these are the traditional methods employed by mining, building & construction and civil engineering for quarrying, demolition or rock removal.

As these industries face escalating urban and natural environmental concerns including the unnecessary destruction of natural habitats, disruption to surrounding wildlife and proximity to residential or cultural heritage areas such as schools and hospitals, Expando has arisen as an environmentally friendly, non-toxic alternative for breaking rocks and concrete.

Expando, a non explosive demolition agent is used throughout Australia for concrete cutting, rock breaking, trenching, concrete demolition, excavation of ground rock and quarrying of valuable slabs such as Limestone, Granite, Sandstone and Marble.

Expando is noiseless, easy to use, reduces labour & equipment costs, doesn’t cause flyrock, ground vibration, gas or dust and is safer than explosive demolition, blasting rock, jack hammering, concrete saws or stone cutters. Expando does not produce fumes or gaseous emissions that could potentially harm the environment or disrupt surrounding work operations, equipment, filtrations systems or the air quality. This makes Expando ideal for sites with noise restrictions, confined spaces or environmental pollution concerns.

Expando is made from organic ingredients including calcium oxide, quartz, Aluminium oxide and Ferric oxide, is odourless, non-flammable, doesn’t cause toxic pollution and can be safely washed away after it has been used.

  • Made from organic ingredients
  • Odourless
  • Non-flammable
  • No ecological contamination to flora or fauna
  • No dust contamination
  • No toxic pollution
  • Environmentally friendly

When mixed with water, Expando has an impressive 14,000 PSI expansive strength, producing significant pressure to fracture and break up rock or concrete in a controlled fashion. Much less energy is required to break the rock in this way, and therefore less must be dissipated on breakage.

Because of its ability to reduce the destructive impacts on the environment that other traditional methods cannot deliver, we believe that Expando is an ideal product for greener buildings and houses.