**FACTS ON CONCRETE STRENGTH TEST**

*Which
test is most suitable for concrete strength?*

A concrete cylinder test or concrete cube test is
usually done after 7 days, 14 days or 28 days to know the strength of the concrete.

*Why Compressive Strength Test of Concrete is Important?*

The concrete cube test will give compressive strength of concrete which gives an idea of all the properties of concrete. By this unique test, we can decide whether the concreting was done correctly or not.

*What is the standard
compressive strength of concrete?*

The compressive strength of concrete ranges from 15
MPa (2200 psi) to 30 MPa (4400 psi) for residential concrete and is high in
commercial structures. Some applications use forces greater than 10,000 psi (70
MPa).

*What is the size of concrete cubes used for
testing?*

Two types of sizes are used for the cube test: which
are,

Cubes of 150mm X 150mm X 150mm or 100mm X 100mm x
100mm depending on the overall size.

150mm X 150mm X 150mm is commonly used for most
works.

*What
is compressive strength after 7 days and 14 days?*

Concrete will achieve its 65% of compressive
strength at 7 days and 90% of the target strength at 14 days.

*Which machine is used for
concrete strength test?*

The compressive strength of concrete is tested by
using a compression testing machine.

*What is the rate of loading on compression testing
machine?*

We will apply load gradually at a rate of 140 kg /
cm2 per minute until the samples fail.

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