SHOTCRETE/ SPRAYED CONCRETE
Sprayed concrete or shotcrete is high performance concrete or mortar, which is sprayed pneumatically through a hose onto a backing surface. For nearly a century, shotcreting has been an accepted way of placing cementitious material in a variety of applications. It is the force of the spraying action that leads to the compaction of the concrete or mortar, which then forms layers of concrete to the required thickness.
Because of the high velocity of the impacting jet, not all the concrete projected on the surface remains in position. Some material rebounds. It has been quoted that rebound can waste 40% or more of sprayed concrete applied in a project. Rebound material consists of the coarsest particles in the mix, so that the shotcrete in situ is richer than would be expected from the mix proportions batched. This may lead to increased shrinkage.
Adfil micro and macro synthetic fibres are the answer to these and other challenges arising in projects involving sprayed concrete. They provide reliable three-dimensional secondary reinforcement. Added to the concrete mix Adfil construction fibres significantly reduce the rebound of shotcrete as well as shrinkage after completion of the project. As such, they not only improve the economics of tunneling and other projects; but they also add to the durability and aesthetics of the finished concrete.
- Improved resistance to plastic shrinkage cracks
- Enhanced bond
- Improved impact resistance
- Increased abrasion resistance
- Improved freeze / thaw resistance
- Reduced rebound of concrete
- Reduced permeability
- Increased speed of construction and reduced labour costs
We here to help if you are unsure which fibre is the right choice to achieve the best result for your shotcreting project!