VERIFIED CORRECT ANSWERS
◉ When do field cured cylinders need to be demolded? Answer: 28
+/- 8 hrs after casting time
◉ Why can lab cured cylinders be demolded earlier than field cured
cylinders? Answer: This is because field cured cylinders will need to
be transported to a lab so they need the extra time to ensure that the
cylinders set properly before being moved around.
◉ When are cardboard moulds used? Answer: For concrete <35 MPA
◉ What temperature should the curing tanks be kept at and how
often should they be monitered. Answer: Temp. should be at 23 +/- 2
C and temperature recorder should be kept in the tank and checked
twice a day at least 5 days per week accurate to 0.5 C.
◉ What should the tanks be saturated with ? Answer: Calcium
hydroxide
◉ What ratio should the cylinders length be to its diameter?
Answer: 2:1