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@hokie66 Yes, you're right.In the report, the strength is given in both ksi & MPa. I've received another report from another batch of concrete, where avg. strength is around 5ksi (after 28days of curing).

@TehMightyEngineer One thing i can assure that the units aren't messed up. May be there was some problem in the testing procedure. Since, we sent those cylider to an university for testing, i don't have any picture during failure.

Water cement ratio was 0.42. 21L of water per bag(50kg) of cement

The ratio represents 1 part cement, 1.5 part fine aggregate(sand), 3 part coarse aggregate (stone chips). All the 3 cylider broke at around 10.5ksi (around 73MPa). It seems quite unusual.

Yes, M20 represent 20MPa, which means my target strength is 3ksi but i got 10.5ksi which is very higher.

Hi, Some cylider specimen (4"x8") were casted & send them for compressive strength test after 14 days. I've used a nominal mix ratio of 1:1.5:3 for M20 grade concrete. But after crushing the strength of the three specimen is around 10.5ksi which is way higher than the target strength. What...

@Tommy385 Thanks for your response. I understand your point. According to ACI 318-14 (8.7.3), it is suggested to use corner reinforcement. I am curious to know, If i want to provide corner reinforcement, do i have to provide it below main top bar? If it has to be provided above top bar, clear...

Hi, I've some confusion about corner reinforcement in two way slab. We know corner reinforcement is provided in discontinuous edge of two way slab to prevent corner slab from lifting and prevents cracks. It is provided upto L/5 distance. My question is whether top corener reinforcement has...