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