Civil Engineering - Building Materials - Discussion

39. 

Pick up the correct statement from the following:

[A]. The theory of formation of concrete is based on the phenomena of formation of voids
[B]. The bulking of sand is taken into account while volumetric proportioning of the aggregates
[C]. The dry sand and the sand completely flooded with water, have practically the same volume
[D]. The expansion and contraction joints are provided if concrete structures exceed 12 m in length
[E]. All the above.

Answer: Option E

Explanation:

No answer description available for this question.

Nirgude Gayatri said: (Aug 26, 2013)  
Why all questions are having answer all of the above? we cannot able to understand this type of question.

Arju Abedin said: (Jan 27, 2015)  
Expansion joint in 12 m? I have doubt in that.

Nischal said: (Feb 14, 2015)  
Expansion joint is provided for > 45m.

Rashmi said: (Nov 21, 2015)  
"The dry sand and the sand completely flooded with water, have practically the same volume".

How can this happen?

Saurabh Kumar Singhal said: (Feb 12, 2016)  
Same thing that concrete structure have expansion joint when the length is increased 45 m.

Pawan said: (Aug 13, 2016)  
No, it's 20m for conc. And 45 for rcc.

Brindha said: (Aug 21, 2016)  
When moisture content is increased by adding more water, the sand particles pack near each other and the amount of bulking of sand is decreased. Thus the dry sand and the sand completely flooded with water have practically the same volume.

Brindha said: (Aug 21, 2016)  
The bulking of sand should be taken into account when volumetric proportioning of the aggregates is adopted. Otherwise, less quantity of concrete per bag of cement will be produced, which naturally will increase the cost of concrete. Also, there will be less quantity of line aggregate in the concrete mix which may make the concrete difficult to place.

Adebola said: (Nov 17, 2016)  
The bulking of sand which is the process by which sand increases in volume as a result of the presence of moisture content must be taken into account while proportioning of the aggregate. Moistened sand bulks greatly and increases in volume hence for each measure of moistened sand, the actual volume of sand particles becomes exaggerated so more sand should be taken to take care of bulking else the mix will be undersanded.

Adebola said: (Nov 17, 2016)  
The dry sand and the sand completely flooded with water, have practically the same volume, at initial stage of adding water to a measure of dry sand, the sand bulks that is increasing in volume but this increase doesn't continue indefinitely, bulking in sand depends on the % of moisture, up to 5% of moisture makes the sand bulk greatly. At a certain % of moisture content, the bulking cases and the volume of the moistened sand begins to decrease. Experiments have shown that when all the voids in the sand are filled with water about 14% moisture (sand saturated with water) its volume practically becomes equal to the measure of dry sand.

Aman Soni said: (Sep 26, 2018)  
Anyone can Explain the limits of expansion joints for different structures?

Zohaib Gilani said: (Apr 21, 2019)  
Good, thanks for explaining @Adebola.

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