Civil Engineering - Building Materials - Discussion

Discussion Forum : Building Materials - Section 1 (Q.No. 39)
39.
Pick up the correct statement from the following:
The theory of formation of concrete is based on the phenomena of formation of voids
The bulking of sand is taken into account while volumetric proportioning of the aggregates
The dry sand and the sand completely flooded with water, have practically the same volume
The expansion and contraction joints are provided if concrete structures exceed 12 m in length
All the above.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
Discussion:
13 comments Page 2 of 2.

Aman Soni said:   7 years ago
Anyone can Explain the limits of expansion joints for different structures?

Zohaib Gilani said:   6 years ago
Good, thanks for explaining @Adebola.

Sushant said:   4 years ago
These are provided along the transverse direction to allow the expansion and contraction of a concrete slab due to temperature and subgrade moisture variation.

They are intended to prevent potentially damaging forces accumulating within the slab itself or surrounding structures. Maximum spacing of expansion joints ranges from 25-27 m in jointed reinforced concrete slabs and from 40 m (for slabs <230 mm thick) to 60 m (for slabs >230 mm thick) in unreinforced concrete.


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