Pour duration = volume ÷ the lower of the pump rate and the truck supply rate. 120 m³ with a 40 m³/h pump and six 8 m³ trucks on a 60-minute cycle (48 m³/h supply) takes 3 hours: starting at 07:00, finishing about 10:00, with a truck every 12 minutes.
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Concrete Pour Duration Calculator
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Pour duration
3 h 00 min
Estimated finish
10:00
Placing rate achieved
40.0 m³/h limited by the pump
Truck supply rate
48.0 m³/h
Truck loads
15
One truck every
12 min
Trucks to keep the pump busy
5
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120 m³, pump 40 m³/h, six 8 m³ trucks on a 60-minute cycle, first truck at 07:00:
Supply = 6 × 8 × 60 ÷ 60 = 48 m³/h, more than the pump, so the pump governs
Duration = 120 ÷ 40 = 3 h 00 min → finish ≈ 10:00
15 loads, one every 12 minutes; 5 trucks would just keep the pump busy
Pour Time by Placing Rate
Volume
25 m³/h
40 m³/h
60 m³/h
50 m³
2.0 h
1.3 h
0.8 h
100 m³
4.0 h
2.5 h
1.7 h
200 m³
8.0 h
5.0 h
3.3 h
400 m³
16.0 h
10.0 h
6.7 h
Frequently Asked Questions
How long does it take to pour concrete?
Divide the volume by the realistic placing rate. Pumps commonly place 25–60 m³ per hour including truck changeovers, but if trucks cannot arrive fast enough, supply sets the pace.
How many trucks do I need for a pour?
Enough to match the pump: pump rate × truck round-trip time ÷ truck capacity. A 40 m³/h pump with 60-minute cycles and 8 m³ trucks needs 5 trucks.
What happens if there is a long gap between trucks?
Concrete already placed starts to set, and a cold joint can form where fresh concrete meets it. Keep intervals short, especially in hot weather, and plan where a construction joint could go if supply fails.
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