Question { Prism Cement, 47896 }

What is the thumb rule for calculating the number of chairs in slab?

Answer

1. Chairs are provided for maintain the proper gap between the 1st layer & 2nd layer.
2. In IS Code it is not mentioned the chair spacing.
3. As per my experience it should be provided 1 chair in 1 sqm.
4. If the slab is 6 sqm then there will we use 6 nos of chairs

Question { Rites, 9332 }

What is the density of steel?
what is the IS code for steel structures?
1t/m2 = ?KN/m2 ??

Answer

1. Density = 7850 kg/m3
2. IS Code 800:2007
3. 1 kg= 9.81 N,
1 ton= 1000kg=9.81 KN,
1t/m2=9.81KN/m2.

Question { L&T, 57795 }

Difference between wbm and gsb in road construction

Answer

1st of all we use gsb & compacted properly.
2. It should be the thickness of 250-500.
3 wbm is used after the laid of gsb.then compacted at dry & again compacted after pouring of water on it.
4. Its thickness should be used 200-250.