Reasons
for concrete cube to have greater compressive strength as compared to cylinder
is
- contact area of a standard cube mould with the upper platen in the testing machine is more which results in more confinement .
- more confinement resist against specimen expansion resulting in more compressive strength
The ratio between cube strength and cylinder
strength is commonly assumed to be 1.25 , but it is not constant.
Thanks for sharing this post about the Compressive Strength of Concrete.
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Why concrete cubes are tested at the face ,perpendicular to the face of casting ?
ReplyDeleteBecause the face of casting is rough compared to the other faces. When load acted on it, it doesn't share the load uniformly and hence the face other than the face of casting is tested
Deletein design we always go to safer side. casting face catch the load uneven which may cause the cracks prior than side faces.it gives us low compressive strength.
DeleteWhy concrete cubes are tested at the face ,perpendicular to the face of casting ?
ReplyDeleteIt's due to consolidation ... on testing on face of casting will have give more comprehensive strength than the actual strength of cube.
Deletebecause casting face has uneven surface so it cause uneven result but the other surfaces are much smooth as compare to that . so for better result we use that
Deletewhat if cube of 15cm by 15cm and cylinder of height 15 cm tested for compressive strength..which one has more strenth???
ReplyDelete15*15 cube is larger by 25% to that of 15 diameter circle. Hence cube able to have more compressive stress acting from top.
DeleteCube have more compressive stress
Deletethe diminsion of cube and cylinder should be standrad for testing
ReplyDeletethe diminsion of cube and cylinder should be standrad for testing
ReplyDeleteThank you.
ReplyDeleteIf the dimensions of both cube and cylinder are taken standard,then the compressive strenth of cube will be 1.25 times more.
ReplyDeleteIf the dimensions of both cube and cylinder are taken standard,then the compressive strenth of cube will be 1.25 times more.
ReplyDeletewhy 15x15x15cm, why not 10 r 20cm
ReplyDeletewhen concrete sample don't have equal sides in length so load acting on it will not be distributed equally mechanically on concrete sample and hence we can not know actual strength of cube because any of its side can crush before the whole cube gets to its yielding point that why we use cubic concrete sample to let to applied load distributed evenly into the fibers of sample
Deletei hope it will help you to understand
if the compressive strength of cube is better then why circular column are better than rectangular columns
ReplyDeleteBecause in circular columns we use helical tie bars which doesnt allow the spalling of concrete due to heavy loads where as in rectangular column we use normal tie bars which doesn't resist any spalling of concrete when the column is heavy loaded
DeleteCompressive strength of cube ( 150 x 150 x 150) is higher than that of cylinder (150 x 300). Length of these two are not same. Buckling may be a factor for cylinder strength.
DeleteBut while considering section we assume of same length for both circular and rectangular column.
circular column is better because it does not have any minor axis whereas rectangular column does have minor axis along which it is prone to buckle.
Why inverted T beams are not used?
ReplyDeleteTaha you can't compare the strength of column by cube or cylinder, because its behavior is totally changed.i.e cube or cylinder is only used for checking of concrete strength only
ReplyDeleteWhy cylinder always cracks as a perpendicular way??.
ReplyDeleteIn calculating the area of the cube where the machine is applied, why the sides of the cube could n`t effect the applied force?? it only cracks the central line as a horizontal direction....
Standard dimensions of cube and cylinder????
ReplyDeleteWhy cast cylinders in field???? Instead od cube has more strength??????
if we convert cylinder strength to cubes strength or its confirm that we used factor 1.25
ReplyDeleteif we convert cylinder strength to cubes strength or its confirm that we used factor 1.25
ReplyDeleteWhy concrete cube has more compresive strength than concret cylinder
ReplyDelete2500 psi cubicle & cylindrical strength difference in percentage
ReplyDeleteFor strength finding what is the using factor of cylinder(100mm*150mm) to cube(150mm*150*150mm) and as well as cube to cylinder... please tell me
ReplyDeleteAny body can provide reference that cube strength is more than cylindrical strength by 1.25 times?
ReplyDeleteThe factor came from comparing same strength concrete from normal computation of S=P/A using the 150mm dia X 300mm H cube against 150 mm cube
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Could you please share your knowledge - other than empirical data how can you justify the factor of 1.25 for conversion.
ReplyDeleteAnd also if we test a different size of cylinder (65 dia & 145 mm depth), how to derive characteristics strength of concrete?
We have found compressive strength of 7 Mpa. Pl tell me what would be characteristics strength?
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Anyone here can tell me which one is a better reference for concrete strength? the cube or the cylinder? since most european uses cube and americans uses cylinder test
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ReplyDeleteEnter your comment...1.25*class of cubic concrete
ReplyDeleteother dimensions is allow or not because of compressive strength is only effect area and load ????
ReplyDelete