Cubes with steel plates would be always better as they also dissipate the load evenly and avoid localised failures, also by applying lubrication platen effect is taken care of.
My doubt finally cleared in these most lucid manner. I have a question.. Since lateral resistance is being mobilised in cube, does that means the strength that we are finding is being over-stated but in reality the true strength of the specimen would be less? It would be very much appreciated to get a reply by you. Thankyou
If incase we are testing compression test on opc 53 cement (which probably works on the same principle as that of concrete compression test ) and we found the value to be 53. This value here is being over stated again due to same reasons... Then can companies sell this cement in the name of grade 53 opc cement which doesn't represent the true strength but is over stated? How does IS code cope up this error of stating grades then .. What is the factor of safety code employs to counter this?
You'll get a strength probably more than 53 in that case. If its less than 53 its not permitted. In design however there are lot of safety factors that IS Code already recommends right from concrete mix design where TMS is greater than required strength to the partial material safety factor taken in LSM.
The compressive strength of cencrete can be tested using cube......but why cylinders are necessary?? only cube test is sufficient or not to find its compressive strength??
Cylinders give more appropriate results, they are slender than cube and also exhibit platen effect due to which the strength of cylinder is lesser than strength of cube. This also creates a safety margin and is almost near to true condition on site.
Sir you say diameter of mould to size of aggregate ratio should be less than 3. And diameter of mould is 15cm and size of aggregate is 2cm.right? Then ratio (15/2)=7.5 So sir how can we say it should be less than 3.???
@@DCBAonline thank you sir for clearing my doubt and sorry for your inconvenience sir Sir i am regularly watching your concrete technology videos that are very useful