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Challenge your concrete knowledge vs. the Concremote result

Four construction sites need your expertise in determining the ideal time to strip the formwork and cycle it to the next casting sections. Estimate the time that it would take for the concrete to reach the desired strength given the respective conditions. All examples are taken from actual construction sites with real conditions

Question 1:

Winter in Dubai: Floor formwork for a single family residence in the UAE

Place and time: Dubai, UAE, December 2013
Target value, desired concrete strength: 4050 psi (= 70% of final strength)
Concrete data: Final strength 5800 psi maximum, grain size 20 mm; 882 lb Portland Cement
Temperatures:

  • Delivery temperature of concrete 72 °F
  • Highest day-time temperature 100 °F
  • Lowest night-time temperature 50 °F

How many days did it take for the concrete to reach stripping strength?

Question 2:

Summer in Central Europe: Floor formwork of office tower

Place and time: Austria, July 2013
Target value: 3500 psi (= 80% of final strength)
Concrete data: Final strength 4350 psi; C25/30 40%CEM I + 50 % CEM III + 10% hydraulic additive
Temperatures:

  • Delivery temperature of concrete 75 °F
  • Highest day-time temperature 104 °F
  • Lowest night-time temperature 65 °F

How many days did it take for the concrete to reach stripping strength?

Question 3:

Winter in Central Europe: Floor formwork of residential building

Place and time: Austria, December 2012
Target value: 2900 psi (= 67% of final strength)
Concrete data: Final strength 4350 psi; C25/20 XC1
Temperatures:

  • Delivery temperature of concrete 54 °F
  • Highest day-time temperature 46 °F
  • Lowest night-time temperature 23 °F

How many days did it take for the concrete to reach stripping strength?

Question 4:

Late autumn in Central Europe: Tunnel sanitation in Austria

Place and time: Austria, November 2014
Target value: 450 psi (stripping strength acc. to structural engineer)
Concrete data: Final strength 5350 psi; C30/37 - XF3 – F59 respectively F5 GK22
Temperatures:

  • Delivery temperature 57 °F
  • Highest day-time temperature 55 °F
  • Lowest night-time temperature 48 °F

How many days did it take for the concrete to reach stripping strength?