Steel Fiber reinforced Sprayed Concrete

Steel Fiber reinforced Sprayed Concrete

Definition

Steel fiber reinforced sprayed concrete, like conventionally reinforced sprayed concrete, consists of cement, aggregates, water and steel. By using and adding steel fibers, the sprayed concrete is homogeneously reinforced. 

Reasons for using steel fiber reinforced sprayed concrete:

·     Saving on the costs for installation of steel mesh reinforcement

·     Reduction in slump due to higher early strengths

·     Elimination of “spray shadow” when spraying onto reinforcing mesh

·     Due to its homogeneity, steel fiber reinforced sprayed concrete can withstand forces of various kinds in various directions at any point on its cross-section. 

Additional notes:

·     The cement content may have to be increased because the fines content of steel fiber reinforced sprayed concrete must be higher than in standard wet sprayed concrete, to anchor the fibers.

·     Adding Silica fume helps to achieve the target values of the sprayed concrete because it also improves anchorage of the fibers.

·     improves the pump ability considerably.

·     The minimum diameter of the pump line should be at least double the maximum fiber length.