Precast concrete fiber
Fewer cracked units. Lower rejection rate. More saleable production.
In a precast yard the expensive failure is not the concrete — it is the unit that gets cast, cured, handled and then written off. Whether a few points off the rejection rate covers the fiber depends on what a cubic metre of your production is worth. The arithmetic is below, and it does not always come out in the fiber's favour.
The expensive problem
Every rejected unit is fully loaded cost
A unit that fails at demoulding has already consumed cement, mould time, labour, curing energy and yard space.
- Cracks at demoulding, before the unit has earned anything
- Handling and stacking damage in the yard
- Transport damage discovered at the far end of a delivery
- Lifting stresses in thin architectural sections
- Rust bleed staining facade panels years after installation
- Mould occupied by a unit that will never be sold
- Rework, replacement and a delivery programme that slips
The Polyguard solution
PrecastGuard PG PC-40 for thin, handled sections
PrecastGuard is dosed for sections that have to survive demoulding, stacking, transport and lifting. The fibers bridge micro-cracking and improve crack control during demoulding, stacking, transport and lifting, and because polypropylene does not corrode, it eliminates the rust bleed and staining that comes from the reinforcement it replaces.
- Grade
- PG PC-40
- Fiber length
- 40 mm
- Typical dosage
- 2–5 kg/m³
- Surface
- No rust bleed
What comes off the bill
Where a precast plant gets the money back
- Units written off at demoulding and in the yard
- Mould turns lost to a unit that will be scrapped
- Rework, patching and cosmetic repair labour
- Replacement transport for damaged deliveries
- Light mesh in thin non-structural sections, where the design permits
- Warranty and remediation cost from rust-stained facades
The comparison that matters
Fiber cost against scrap cost
Take annual production value, multiply by the current rejection rate, and compare that with the fiber cost of the same production. Which of the two is larger depends entirely on the value density of what you cast — the production value carried by each cubic metre.
Steel purchaseTransport & storageCutting & lap wasteChairs & spacersPlacing labourSupervisionPlacement delayPolyguard fiber, dosed in the mix
The figures are arithmetic on your own numbers, not a performance claim. Actual reduction depends on section geometry, mix, dosage, handling regime and mould design.
Two horizons
Yard economics and building economics
In the yard
- Fewer units lost between demoulding and delivery
- More saleable output from the same moulds and shifts
- Less patching, less cosmetic rework, fewer credit notes
- Thinner sections viable where light steel was the constraint
In the building
- No rust bleed on exposed architectural surfaces
- Cover driven by durability, not by steel protection
- Better performance in chloride and sulfate exposure
- Fewer facade remediation claims over the building's life
Worked example — rejection rate arithmetic
Illustrative figures. Put your own production value and rejection rate in.
- Annual production value
- 4,000,000
- Current rejection rate
- 4.0% → 160,000 written off
- After improvement
- 2.5% → 100,000 written off
- Recovered per year
- 60,000
- Annual concrete volume
- 9,000 m³
- PrecastGuard at 3 kg/m³, 3.40 /kg
- ≈ 91,800
- Fiber cost per m³
- 10.20
- Production value per m³
- 4,000,000 ÷ 9,000 ≈ 444
- Net position on rejection alone
- −31,800 — the saving does not cover the fiber here
- Break-even value per m³
- ≈ 680 — above this, a 1.5-point cut pays for the dose on its own
That is the honest shape of it: at 444 per cubic metre this is low-value production, and the rejection line alone does not pay for the dose. On architectural and facade work, where a cubic metre carries several times that value, the same 1.5 points clears the fiber comfortably. Either way the rejection saving is one line of the case, not all of it — rework labour, replacement transport, light mesh removed from thin sections and avoided facade remediation sit alongside it. Run the arithmetic on your own production value and loss rate before you compare fiber prices.
Your numbers
What a point of rejection is worth
Every figure below is yours. The calculator will tell you the rejection cut you need before the dose pays for itself — and it will say so plainly when your own target does not reach it.
Precast production ROI calculator
Rejection, rework and handling damage against the annual fiber investment.
CurrencyUSD
Result
- Annual production value
- —
- Current rejection loss
- —
- Rework cost
- —
- Handling & transport loss
- —
- Annual fiber investment
- —
- Fiber cost per m³
- —
- Rejection cut needed to break even (points)
- —
- Recovered production value
- —
- Rework & claims avoided
- —
- Return on the fiber spend
- —
- Months of benefit to cover the dose
- —
- Net annual benefit
- —
Indicative only. Rework and claims are assumed to fall in the same proportion as rejection — that is your assumption to accept, not a Polyguard claim. The dosage must be confirmed by structural design and a trial mix.
Questions plant managers ask
Production and finish
Does fiber show on an architectural face?
Does it slow the production cycle?
Can it replace the cage in a structural unit?
What about self-compacting mixes?
Price the whole panel cost, not just the mesh
Send the drawing, the exposure class and the loading. You get a dosage recommendation, a data sheet and an installed-cost comparison against your current specification.