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Field tool
Fiber bags and a pigment start from area and thickness. It is not a specification. UltraPave is dosed per tonne of asphalt — email us for plant rates. Screens lie; ask for a card before you lock a color.
One toss-in bag per cubic metre for plastic-shrinkage control — the rate we publish with the product. That is roughly 0.46–0.60 kg/m³ depending on the bag. Increase only if the mix design says so.
The calculator uses 3 kg/m³ as a conversation starter for many slab-on-grade mesh-replacement discussions. Residual strength is a design value. Ask the engineer before you pull the steel.
Shown as 1 kg/m³ so you can shop a trial, inside a 0.6–1.8 kg/m³ conversation. Premix GFRC and spray-up live at very different fiber fractions.
1% is a tint, 3% is a working architectural start, 5% is deep. Carbon black and iron oxide black are not interchangeable — see the pigment page. Final shade still depends on the cement.