Concrete Cylinders strength gain more than 100 % at 7 days break
Concrete Cylinders strength gain more than 100 % at 7 days break
(OP)
The test results for concrete cylinders for 35 MPa and 60 MPa show strength gain more than 100% at 7 days break. Any one can focus on the issue what factors can cause concrete cylinders to gain more than specified strength at earlier than 28 days age. Is there any testing issue?
The lab is using curing tanks for curing. The temperature of water in curing tank ranges between 21 and 25 degree celsius. The ends of the cylinders capped using sulper
Thanks to all
The lab is using curing tanks for curing. The temperature of water in curing tank ranges between 21 and 25 degree celsius. The ends of the cylinders capped using sulper
Thanks to all





RE: Concrete Cylinders strength gain more than 100 % at 7 days break
RE: Concrete Cylinders strength gain more than 100 % at 7 days break
Watch the results closely for a while to see if this repeats. If so, check the testing first, then the batching.
Curing temperature, at 25C is just slightly high...that can cause early strength gain if it is consistent.
RE: Concrete Cylinders strength gain more than 100 % at 7 days break
RE: Concrete Cylinders strength gain more than 100 % at 7 days break
About curing temperature CSA recommend curing temperature should be 23 plus or minus 2 C. When the cylinders were tested for 28 days the strength gain is 40 % higher than 7 days strength (If strength is 40 MPa @ 7 days than @ 28 days strength is 57 MPa)
My only concren is do I need to ask testing lab to review there testing procedure or not?
Thanks to all
RE: Concrete Cylinders strength gain more than 100 % at 7 days break
Just keep in mind that testing labs do more through their procedures to reduce the apparent strength of concrete than to increase it; however, I have investigated lab results where there was actually no test performed...just made up and reported falsified results. That's rare, but it does happen.
I would agree with BigH that there is likely some "juicing" of the cement content to get higher early strengths.
Do the batch tickets match the mix design?
RE: Concrete Cylinders strength gain more than 100 % at 7 days break
point I'm making, I see it everyday, its nothing abnormal. I have seen 100% in 3 day breaks. It just a good mix
ICC special inspector, Structural masonry, Reinforced concrete.