Answer / akrmsb

It is done by the rebound hammer test.

A cube of size 150mmX150mmX150mm is kept in the machine and a gradual load of 140kn/cm2/minute is applied on it till it fails.

Then the reading on the machine is divided by the area of cube to get the actual compressive strength.

For example area of the cube is 150mm X 150mm = 22500mm2
and the reading from the machine is 751000 n/mm.

Then the compressive strength of the cube will be 751000/22500 = 33.37 N/mm.

Answer / skj

we put the cube in compressive testing machine then apply
load in kn unit then we note downthe reading just srating cracks

Answer / ronak shah

putcube in compressive testing machine, give pressure 140
kg/sqcm/minute.

strength= load/area

if you want to know the solid cube density. take weight of
cube.
forumala;
density=mass/volume=weight of cube/volume of cube
(0.15*0.15*0.15)

ans gives you density of solid concrete.

if you want wet concrete density then take cylinder 10
liter weight of empty cylinder then fill with concrete

weight of concret/volume of cylinder its gives density of
wet concrete.

Answer / md sajid

Qube strength

Answer / gourab

By Rebound hammer test

how to calculate 1:1.5:3 ratio concrete cement, sand, metal and water please give me brief calculation

5 Answers   DLF, Sobha Developers,

What should be the lap length in raft if height of raft is 0.800mm ...it couldn't b 50D or 40D...we just have to join upper and bottom reinforced...is there any formula for determine it...

0 Answers   SIPL,

How to find permissible diagonal tensile stress in reinforced brick work

0 Answers  

What is the difference between tor steel and tmt steel?

0 Answers  

What do you mean by tolerance factor of concrete ?

0 Answers  

why will provide chair in slab

1 Answers   Prime Bank,

In beams why the depth is > width

3 Answers   L&T,

How to decide the Lap Length in Steel Reinforcement

7 Answers   Jubilant,

CM 1:4 !:5..what CM stands for?? and what is standard ratio used for external plaster??

4 Answers  

1)Why we can use half brick in 4inch wall and 2)why not in 9+inch brick wall

0 Answers  

Reinforcement details at hinged joint

0 Answers  

What is the formulae of percentage of steel

3 Answers   NTPC, Private,