Civil Engineering - Concrete Technology - Discussion


If the engineer-in-charge approves, the 10 cm cubes may be used for the work test of concrete provided maximum nominal size of aggregate, does not exceed

[A]. 10 cm
[B]. 15 cm
[C]. 20 cm
[D]. 25 cm
[E]. 30 cm

Answer: Option C


No answer description available for this question.

Hassan Bin Irshad said: (Apr 30, 2014)  
How can aggregates of 20cm = 8in can be used in mould/sample/specimen of 10cm = 4in which is smaller in dimension than that of aggregates.

Aravind Gottumukkala said: (Aug 29, 2014)  
The units in the options must be mm, because max size of coarse aggregate used in rcc works is limited to 40mm.

Nitu Sharma said: (Sep 28, 2014)  
According to IS 456-2000 we can only use the aggregates of size up to 1/4th of the size of our member or structure.

Parveen said: (May 5, 2015)  
20mm max size of aggregate.

Lokesh said: (Jul 21, 2015)  
No @Praveen even 40 can be used depending up on structure and design mix.

Indrakesh Kashyap said: (Sep 2, 2015)  
10 cm cube and 20 cm aggregate it is how?

Piyush Singh said: (Sep 5, 2015)  
10 cm cube can be used for aggregate of size less than or equal to 10 mm, as a true representative sample can be obtained, also strength of the 10 cm cube will be more than the 15 cm cube as end resistance is very high in case of 10 cm cube.

Ayon Som said: (Aug 9, 2016)  
The unit in the answer should be in "mm" instead of "cm".

So, the correct answer will be 25 mm instead of 25 cm.

Umair said: (Aug 17, 2016)  
It is 20mm. Please change it.

Baloch said: (Nov 13, 2016)  
I think given data's are in millimetres not centimetres,

20 mm is normal size segregates (which can be used in sampling).

40mm is used for mass concreting and 10mm is for flooring etc.

Piklu Manna said: (Dec 22, 2016)  
It should be 20 mm.

Gujjar 22 said: (May 31, 2017)  
How it is possible? Please explain it in detail.

Khilendra said: (Jun 4, 2017)  
20 mm for 15 cm cube.

10mm for 10 cm cube.

Tapan Kumar Parida said: (Oct 25, 2017)  
The Unit should be in mm.

Prem Meena said: (Nov 3, 2017)  
For 10 cm cube size of aggregate 20mm or less and for 15 cm cube size of aggregate more than 20mm is used.

Suku said: (Nov 19, 2017)  
The Maximum size of aggregate on water retaining structure is 40 mm?

Please explain.

Garry said: (Dec 2, 2017)  
Yes correct, Agree @Ayon Som.

Vrinda said: (Dec 9, 2017)  
It must be 20 mm.

Minesh Rathore said: (Jan 5, 2018)  
It is not 20cm, it is 20 mm.

Garry said: (Jan 13, 2018)  
Correct answer will be One by fourth of the size of members are the size of member is 10 centimetre so the nominal size of aggregate will be 25 mm.

Nktripathi said: (Apr 23, 2018)  
20mm nominal size aggregate is the correct answer.

Nktripathi said: (Apr 23, 2018)  
20mm nominal aggregate.

Avi said: (May 28, 2018)  
19 mm is the correct answer.

Prakash said: (Jun 28, 2018)  
If it's RC structure that maximum size of the coarse aggregate is 1/5th min dimensions of RC member so =1/5*10=2cm (20mm).

Otherwise, if it's pc structure the maximum size of the coarse aggregate is 1/4th of the min dimensions of PC member so=1/4*10=2.5cm(25mm).

Now for this question they mentioned cube that means it's pc structure so the answer will be the 25mm is correct.

Deepu Maurya said: (Oct 21, 2018)  
According to me, it is 20mm.

Prabhat said: (Jun 6, 2019)  

Yes, it is right it's 19mm for 10cm cube and for 15cm cube it's 38mm.

Arunvishnu said: (Jun 9, 2020)  
We know, for RCC, max. Aggregate size = 1/5th of the least lateral dimension of mould.
Similarly for PCC, max size of aggregate is 1/4th of least dimension of mould.
Here ,if it is RCC, Max size of aggregate =(1/5)*100 mm = 20mm.
If PCC, Max aggregate size = (1/4)*100 = 25 mm.

Ajay said: (Jan 13, 2021)  
According to me, it will be 20 mm not at 20cmm.

Waqar Khaliq said: (May 24, 2021)  
For massive structure =40mm.
For RCC =20mm.
For floors =10mm.

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