Civil Engineering - Concrete Technology - Discussion

46. 

Internal friction between the ingredients of concrete, is decreased by using

[A]. less water
[B]. fine aggregates
[C]. rich mix
[D]. more water and coarse aggregates
[E]. none of these.

Answer: Option D

Explanation:

No answer description available for this question.

Hassan said: (Apr 29, 2014)  
How can we assume that by increasing coarse aggregates can result in decrease in internal friction?

But if we increase fine aggregates we can.

Abbasuddin Mallick said: (Jun 27, 2014)  
I'm also agree with hassan. How can we assume that by increasing coarse aggregates can result in decrease in internal friction?

But if we increase fine aggregates we can.

Abhi said: (Mar 19, 2015)  
I think it is C. Rich mix may reduce friction.

Rajendran.P said: (Mar 29, 2015)  
If we adding coarse aggregate, the surface area will less so we can reduce the friction.

Sivaraja said: (Sep 10, 2015)  
Lubrication system will reduced the friction adding fine aggregate and rich mix will reduced the friction.

Dimpi said: (Oct 3, 2015)  
If we increase water bleeding will happen. If we increase CA Honeycomb will occur because infront of that FA will decrease. The main moto of using the homogeneous (Coarse void should be filled by fine aggregate & fine aggregate void filled be Cement paste) mix proper proportion of aggregate.

So he answer is rich mix, which covers the surface of aggregate & reduce the internal friction.

Apcivilian said: (Nov 22, 2016)  
Answer is right.

If we use C. A and more water then surface area will decrease and less interlocking between particles!

The Same condition occur when we use more water content, due to lubrication internal friction will reduce!

Ankit Jaiswal said: (Aug 26, 2017)  
How, if we increase water so there will be less work ability and slump value. This is not a way to reduce internal friction we must use some special ingredients.

Lok Bdr Rokaya said: (Oct 31, 2017)  
Answer is Right. It is based on surface area.

Laxmannaik said: (Jan 17, 2018)  
Option C is correct.

Rich mix will reduce friction.

Sohail Soomro said: (Apr 18, 2018)  
I think the Answer is based on the idea that coarse aggregates provide less surface area of contact than the fine particles that provide a higher surface area of contact b/w particles that causes friction.

Talib said: (Dec 2, 2018)  
In course aggregates surface area is less and hence less friction.

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