How to calculate compressive strength of concrete?
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Answer Posted / harshal.s.khode , inspection e
Depending upon the quantity of concrete ,the nos of cube
mould is decided .first you finalised the set of cubes the
standard size of ( 150x150mm). after pouring the cubes
moulds , every cubes moulds is filled in required layer by
layer and every layer is tamping by 10 strokes.after
compacted the cubes moulds the following information is
noted on cubes / to maintain the site register for testing
data such as
1. Name of the structure were the cubes will be taken
2. Nos of sets
3. Date of casting
4. Time of casting
5. Grade of concrete
6. 7 days result
7. 28 days result
Then all the cubes moulds shall be pouring into the water
tank for 28 days curing.to calculate the 7 days result
required nos. of cubes mould are taken out and tested in
the COMPRESSION TESTING MACHINE.the same process are
carried out for 28 days.
Compressive strength of concrete = LOAD AT BREAKAGE ON DIAL
GAUGE
SURFACE AREA OF THE CUBES MOULDS
For 7 days test result the strength to be gain by
approximately about 70% of the grade strength of the
concrete and For 28 days test result the strength to be
gain by approximately 100 % of the grade strength of the
concrete. Normally the unit of compressive strength as
KG/SQMM , N/SQMM.
As per thumb rule , at the time of weighing the cubes the
minimum weight of cubes are 8.6 kg .
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