Construction
How Much Water Per Cubic Metre of Concrete, and for Curing?
By the Dubai Water Tankers team · Published · Updated
How much water is needed per cubic metre of concrete?
Typical structural concrete mixes use roughly 150–200 litres of water per cubic metre, set by the mix design's water-cement ratio. At that rate, one 2,500-gallon tanker (about 9,460 litres) holds mixing water for around 47–63 m³ of concrete. Curing needs extra water on top, and it must be clean sweet water — never salt water.
- Mixing water: roughly 150–200 L per m³ (check your mix design)
- 2,500 US gal ≈ 9,464 L ≈ mixing water for ~47–63 m³
- Keep concrete moist while it cures — commonly at least 7 days
- Salt water corrodes reinforcement: sweet water only
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Get Price on WhatsAppMixing water: set by the mix design
The amount of water in concrete isn’t a site decision — it comes from the mix design, through the water-cement (w/c) ratio. Typical structural mixes land somewhere around 150–200 litres of water per cubic metre. Lower w/c ratios give stronger, more durable concrete; adding extra water on site to make it flow weakens it.
Your engineer’s mix design is the number to use. The range above is for planning how much water to have on site, not for mixing.
Ready-mix vs site-mixed
Most concrete on Dubai sites arrives as ready-mix from a batching plant, which adds the mixing water itself. In that case your site water goes on curing, cleaning and workers’ welfare, not mixing. Site-mixed concrete — small villa works, blockwork mortar, repairs — needs mixing water from your site tank.
How far does one tanker load go?
| Mixing water per m³ | Concrete from one 2,500-gal load (9,464 L) |
|---|---|
| 150 L | ≈ 63 m³ |
| 180 L | ≈ 53 m³ |
| 200 L | ≈ 47 m³ |
For a 30 m³ site-mixed pour at 180 L/m³, you need about 5,400 litres of mixing water — roughly 1,430 US gallons, or just over half a load.
Curing water
Concrete gains strength while it stays moist. The American Concrete Institute’s curing guidance (ACI 308) commonly calls for keeping ordinary concrete moist for at least 7 days, longer for some cement types and conditions. Dubai’s heat and wind dry surfaces fast, so curing water use is higher in summer. Methods:
- Ponding or spraying — uses the most water.
- Wet hessian or curing blankets — kept wet by periodic spraying.
- Curing compounds — use very little water.
Because curing demand depends on the slab area, the method and the weather, plan it from your site’s own readings in the first week, then set a delivery rhythm.
Never use salt water in concrete
Chlorides in salt water attack the steel reinforcement inside concrete, leading to corrosion, cracking and costly repairs. The American Concrete Institute advises against seawater in reinforced concrete. Mixing and curing water must be sweet (potable) water. Keep salt water for compaction and dust suppression only — see dust suppression and compaction water.
Planning deliveries
- Estimate mixing water (if site-mixed) from the mix design and pour volumes.
- Add curing water from the first week’s actual use.
- Add welfare and cleaning water for the crew.
- Divide the weekly total by 9.46 m³ to get 2,500-gallon trips — or use our construction calculator.