Fibre reinforced concrete vs. reinforcement mesh: the difference in time and cost

For many clients, the choice between fibre reinforced concrete and reinforcement mesh ultimately comes down to a calculation: what does the project cost in time and money? In this article we set the cost structure of both methods side by side.

The cost structure of reinforcement mesh

With traditional reinforcement using mesh or mats, the process consists of several steps that all cost time and labour hours:

• Delivery and storage of the reinforcement mesh on site.

• Cutting or bending mesh to size around penetrations, edges and connections.

• Positioning the mesh at the correct height in the formwork, usually with spacers.

• Anchoring and connecting mesh together (overlaps, tie wire).

• Checking the reinforcement position before pouring.

Each of these steps requires specialised staff and time — and time on a construction site translates directly into cost.

The cost structure of fibre reinforced concrete

With fibre reinforced concrete, most of this process disappears: the fibres are added by the concrete plant during mixing and come out of the concrete mixer along with the rest of the mix. There is no separate delivery, no cutting to size, no positioning and no anchoring required. All that remains is the regular pouring process — although fibre reinforced concrete does require accurate dosing and thorough mixing, and sometimes extra attention when finishing.

Where does the real saving lie?

The direct material cost of fibres versus reinforcement mesh can be comparable per project, or can even favour mesh for very large quantities of steel. The real saving lies in:

• Labour hours: eliminating placement and anchoring work generally saves the most cost, especially on projects with a large floor area.

• Lead time: a shorter preparation time in the formwork speeds up the overall build programme, which in turn indirectly saves cost (for example, less hire of construction equipment or earlier completion).

• Less waste: offcuts from mesh cut to size are largely eliminated.

• Fewer errors: incorrectly positioned reinforcement is a well-known cause of failure costs; with fibre reinforced concrete this source of error simply does not exist.

A concrete example from practice

In a recent project where traditional steel reinforcement was replaced with fibre reinforcement for the foundation of tree and planter boxes, a net 1,500 kg of reinforcing steel was saved. The entire design was converted to fibre reinforcement within two days, including approval from the municipality — a lead time that would have been considerably longer with traditional reinforcement (ordering, delivery, placement).

When is the saving greatest?

The cost saving of fibre reinforced concrete compared with reinforcement mesh is generally greatest for:

• Large, relatively flat surfaces (industrial floors, yard paving).

• Projects with a tight schedule or limited availability of specialised reinforcement staff.

• Repetitive, standardised elements (such as foundations for lighting columns, planter boxes or smaller structures).

For very specific, heavily structural applications with precise reinforcement calculations, the saving is smaller, and (additional) traditional reinforcement is often still required. The subsoil also plays a role: a well-placed reinforcement mesh keeps both sides of a crack on the same plane and thereby limits differential settlement. On clay or expansive soil a mesh can therefore be essential, whereas fibre reinforcement is generally sufficient on stable, sandy ground and under lighter loading.

In conclusion

The greatest cost benefit of fibre reinforced concrete lies not in the material itself, but in the time and labour hours saved by eliminating a separate reinforcement operation. For many projects that difference is decisive.