The average crushing strength of precast concrete blocks as per CAI is __________

The average crushing strength of precast concrete blocks as per CAI is __________ Correct Answer 3.5 N/mm2

Hollow concrete blocks are used in load bearing walls. In the manufacture of these blocks, the light height aggregates are used. The recommended size is 39 × 19 × 30 cm. The average crushing strength of blocks Shall be 5N/mm2.
Bissoy MCQ

Related Questions

Cold crushing strength of ordinary fireclay brick is about 950 kg/cm2. On exposure to a temperature of about 1500°C, its crushing strength may come down to as low as __________ kg/cm2.
_____________ arches can be constructed of the precast cement concrete blocks or Monolithic concrete.
How many blocks away will Fred be from his starting p;ace if he travels two blocks north , then three blocks east, and then two blocks south?
How many blocks away will Fred be from his starting place if he travels two blocks north, then three blocks east and then two blocks south?
Calculate ultimate moment and shear of effective span is 30m, live load is 9kn/m, dead load excluding self weight is 2kn/m, load factors for dead load is 1.4 for live load is 1.6 cube strength of concrete fcu is 50n/mm2 cube strength at transfer is fci is 35n/mm2, tensile strength of concrete Ec is 34kn/mm2 loss ratio ɳ is 0.85 and 8mm diameter high tensile strength fpu is 1500n/mm2 are available for use and the modulus of elasticity of high tensile wires is 200kn/mm2?
During the construction of earthquake-resistant buildings, it should be kept in mind that those solid concrete blocks should be used which have crushing strength not lesser than _________
An O.C. mine requires 16 blocks of overburden of 3000 te each to mine 4 blocks of coal of 2000 te each. The mining cost of both overburden and coal is Rs. 50 per tonne. The cost of transportation of overburden to dump areas is Rs. 50 per tonne. Coal transportation cost to the selling point is Rs. 75 per tonne. The price of coal is Rs. 800 per tonne, If the royalty and tax to the state is Rs. 50 per tonne, the nominal profit in rupees is
A concrete column used in bridge construction is cylindrical in shape with a diameter of 1 meter. The column is completely poured in a short interval of time and the hydration of concrete results in the equivalent of a uniform source strength of 0.7 W/kg. Determine the temperature at the center of the cylinder at a time when the outside surface temperature is 75 degree Celsius. The column is sufficiently long so that temperature variation along its length may be neglected. For concrete Average thermal conductivity = 0.95 W/m K Average density = 2300 kg/m3
Solid concrete blocks are obtained from lightweight aggregates while hollow concrete blocks are obtained from heavy aggregates.
What is the general 28-day crushing strength of concrete for mono block prestressed concrete type sleeper?