Minimum grade of concrete to be used in reinforced concrete as per IS: 456-1978 is
A. M15
B. M20
C. M10
D. M25
Answer: Option B
Solution (By Examveda Team)
As per IS: 456-1978, the minimum grade of concrete required for reinforced concrete (RC) structures is M20.The M20 grade concrete has a characteristic compressive strength of 20 MPa after 28 days of curing.
Lower grades like M15 and M10 are generally used for plain cement concrete (PCC) and are not suitable for reinforced structures.
Higher grades such as M25 and above are used for structural members requiring higher strength.
Hence, the correct answer is M20 (Option B).
This Question Belongs to Civil Engineering >> Concrete Technology And Design Of Concrete Structures
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Comments (5)
In symmetrically reinforced sections, shrinkage stresses in concrete and steel are respectively
A. Compressive and tensile
B. Tensile and compressive
C. Both compressive
D. Both tensile
Critical section for shear in case of flat slabs is (adopting standard notations)
A. At a distance of effective depth of slab from periphery of column/drop panel
B. At a distance of $$\frac{{\text{d}}}{2}$$ from periphery of column/capital/drop panel
C. At the drop panel of slab
D. At the periphery of column
A. depends on as, only
B. depends on aCbC only
C. depends on both crst and acbc
D. is independant of both ast and acbc where d is the effective depth, ast is per-missible stress in steel in tension and ocbc is permissible stress in concrete in bending compression.
The diameter of ties in a column should be
A. More than or equal to one fourth of diameter of main bar
B. More than or equal to 5 mm
C. More than 5 mm but less than one-fourth of diameter of main bar
D. More than 5 mm and also more than one-fourth of diameter of main bar
It's M20
According to IS 456 2000 min grade is M20
Acc to IS456 1978 min grade is m15
IS : 456-2000 has recommended that minimum grade of concrete shall be not less than M-20 in reinforced concrete work. Design mix concrete is preferred to ...
IS : 456-2000 has recommended that minimum grade of concrete shall be not less than M-20 in reinforced concrete work.
Check the answer again plz