The shaft has been completely plugged by several hundred feet of foamed concrete."

Foamed concrete has been selected as the solution for the large scale infilling of the old mine works.

Concerns of IBA use in foam concrete have been expressed by the UK Health and Safety Executive in 2010 following several construction and demolition explosions.

All mine workings inside the boundary of the planning application were stabilised using foamed concrete to satisfy a 100-year design life while ensuring archaeologically important areas and bat habitats were protected.

In the event of an explosion, all the force that would have gone landward should be diverted straight up or expended on destroying the blast wall, which was made of a foamed concrete that would boil off rather than break.

The work was largely complete by November 2009, by which time approximately 600,000 cubic metres of foamed concrete had been used to fill 25 hectares of very shallow limestone mine, making it the largest project of its kind in the world.

If IBA is used as the aggregate in foam concrete in non-ventilated areas, hydrogen gas deposits may build up during the lifespan of the material and explode when brought into contact with sources of ignition, such as during cutting with grinding equipment.

The shaft has been completely plugged by several hundred feet of foamed concrete."

Foamed concrete has been selected as the solution for the large scale infilling of the old mine works.

All mine workings inside the boundary of the planning application were stabilised using foamed concrete to satisfy a 100-year design life while ensuring archaeologically important areas and bat habitats were protected.

In the event of an explosion, all the force that would have gone landward should be diverted straight up or expended on destroying the blast wall, which was made of a foamed concrete that would boil off rather than break.

The work was largely complete by November 2009, by which time approximately 600,000 cubic metres of foamed concrete had been used to fill 25 hectares of very shallow limestone mine, making it the largest project of its kind in the world.

Graduate Studies looked like soap bubbles: foamcrete sprayed over inflation frames.