RCC Short Question . Concrete Reinforced Cement Concrete. Rcc

 

1)     As per IS: 456 - 1978, the pH value of water shall be not less than 6.

2)      Spacing of stirrups in beams of effective depth’d’ should not be more than 0.75d or 300 mm, whichever is less.

3) In a singly reinforced beam, the effective depth is measured from its compression edge to the centroid of the tension reinforcement.

4) An R.C.C. roof slab is designed as a two-way slab if the ratio of longer span to shorter span is less than 2.

5) The value of the maximum strain in concrete under bending compression in outermost fibre, as per IS 456:2000 (Limit State Method), is 0.0035.

6)  The minimum headroom over a stair must be 2.2 meters.

7) An R.C.C. column is treated as long if its slenderness ratio is greater than 12.

8) The toe projection of foundation slabs is taken as minimum 150 mm or 1/5th of the depth of foundation, whichever is more (depends on site conditions, often approx. 1/3rd to 1/5th of footing width).

9)  Partial safety factor for steel as recommended in IS:456 -2000 for Limit State Method is 1.15.

10)  The maximum shear stress (τc,max) in concrete of a reinforced cement concrete beam depends on grade; for example, for M20, it is 2.8 N/mm². (Refer Table 20, IS 456:2000)

11)  As per IS 456:2000, the total deflection due to all loads including effects of temperature, creep and shrinkage should not exceed span/250.