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# In concrete compression test, normally 150mm x150mm x150mm concrete cube samples is used for testing. Why isn’t 100mm x100mm x100mm concrete cube samples used in the test instead of 150mmx150mmx150mm concrete cube samples?

Basically, the force supplied by a concrete compression machine is a definite value. For normal concrete strength application, say below 50MPa, the stress produced by a 150mmx150mmx150mm cube is sufficient for the machine to crush the concrete sample. However, if the designed concrete strength is 100MPa, under the same force (about 2,000kN) supplied by the machine, the stress under a 150mmx150mmx150mm cube is not sufficient to crush the concrete cube. Therefore, 100mmx100mmx100mm concrete cubes are used instead to increase the applied stress to crush the concrete cubes.

For normal concrete strength, the cube size of 150mmx150mmx150mm is already sufficient for the crushing strength of the machine.

This question is taken from book named – A Self Learning Manual – Mastering Different Fields of Civil Engineering Works (VC-Q-A-Method) by Vincent T. H. CHU.

### Kanwarjot Singh

Kanwarjot Singh is the founder of Civil Engineering Portal, a leading civil engineering website which has been awarded as the best online publication by CIDC. He did his BE civil from Thapar University, Patiala and has been working on this website with his team of Civil Engineers.

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## 20 comments on "In concrete compression test, normally 150mm x150mm x150mm concrete cube samples is used for testing. Why isn’t 100mm x100mm x100mm concrete cube samples used in the test instead of 150mmx150mmx150mm concrete cube samples?"

dhaval says:

i have a question, What should be the minimum curing period of concrete if we use PPC cement?
2. Are the 28 days strength of PPC and OPC cement used concrete the same?

chevon says:

yes it does

usman karimpil says:

Normally 7 day is enough, but some specification is saying 10 days, if concrete contain microsilica (for high strength concrete ) this will increases to 14 day.

B S VERMA says:

Answer of the equation regarding size of cube testing specimen 150x150x150mm and why not 100x100x100- I think answer given by (VC-Q-A-Method) by Vincent T. H. CHU. is not correct.

Bartholomew peter says:

@ B S WERMA what is the right answer

amol ashok metkari says:

how to incresed compresive srength in 7days.
please send me procedure of concrete mix propotions.
THANKING YOU,

sagar says:

how much strength should 100mm cube gain in 7 days?
compared to 150mm cube

hamidu ibrahin says:

what is the standard value for the crushing strenght of the concrete cubes

sir,im preparing concretecubes for iitmadras fest2012.i want the mix proportions for cubes with strength greaterthan 50megapascals.plz suggest me.i have to send the report quickly.and the cement content must be lessthan450kg/m3.awaiting for ur reply sir………….

sai venkatesh says:

sir, i want to make concrete cube 150*150*150 mm cube of high strength above 60mpa for 7days so please suggest me the materials and thier quantities…

sudhir akarte says:

Pl.tell me in detail why we used 150*150*150 mm cube for concrete tesing and not 100*100*100 mm

Kaushal Kishore says:

Please read the paper title QUALITY CONTROL OF CONSTRUCTION-TESTING OF CONCRETE CUBES on Civil Engg Portal. l50 mm Size cube is specified by IS:456-2000. For more details please read this paper.

nani says:

I want to know how to calculate the peace rate for 150 mm size with detail?

NEUPANE Ram Chandra says:

In compression test (cross-sectional area remaining constant) if we test cylinder with varying height, the capacity of shorter one is greater. Can anyone tell me the reason based on material non-linearity and micro structural approach?

sunil kumar,kamla land marc,ville parley (E) says:

is the all cement strenth ie MPa r same in 43g nd 53g ?

Sudip Bajpayee says:

Diffrent types Conrete Cube moulds may be used, 100x100x100, 150x150x150, 250x250x250 & 300x300x300. It depends upon the size of aggregates, for 20mm agg. 100mm / 150 mm cube mould are used. For 40 mm over size moulds are used.

For 150 mm cube mould filled in 3 layer with 35 nos strokes in each layer, where as inavalibility of 150 mm mould; 100 mm cube mould may be used filled in 3 layers in 25 nos stroke in each layer.

Rohitash Kumar says:

Please. Tall me why we use formula for 150×150×150 mm cub testing for concrete

muhiuddin says:

weight of concrete cubes grade M30 dimension 15x15x15 how much?

a.m jeen wala says:

How to calculate the cube testing reading in N/MM2

prince says:

what should be the size of cube mould for 40 mm aggregates