m20-for 7 days it should be 67% and for 28 days it should be 100%...formula for cube testing:
ex: m20
size of cube surface area is 15*15 =225/10=22.5

for m20 7 days 20 * 22.5 * 67% = 301.5 kn.
28 days 20 * 22.5 = 450 kn.

hersh parikh

Aug 13th, 2013

we have made a rcc cube test of M25 and the report of cube test says that it has comp. strength of 7.33 (N/mm2) for the first cube for the second cube it is 12.08 (N/mm2) and for the third cube it says 9 (N/mm2) now we are not able to understand that is this good strength of not. and all this cube where having 30 days of curing. one more this what is IS 456 and IS 516

B.Mohamed Mansoor

Nov 3rd, 2013

Ex for M 25.

Area of cube 150*150 mm=22500 mm2 so we need to n per mm2 so we get 22500/1000=22.5N/mm2

so M25 for 7 days load/area=so load should be above 16 n/mm2 = 67% Strength

M25 for 25 days load/area =so load should be above 563 KN 100% strength.

shabab

Dec 19th, 2014

how many days cube should be under water for 7 dayz test

VIKAS JOSHI

Jan 31st, 2015

We are taken the cube in under water but on site this is not possible. cant taken the footing ,column or any rcc structure in under water .so how will be comp. strength calculate?

rajib

Apr 27th, 2015

R28=1.64*RA+8.09

yogesh kapase

May 5th, 2015

what is mean by RA

Benjanette L. Bundalian

Mar 8th, 2016

For the concrete cube there is third party to take sample that can use concrete cure for testing 7 days and 28 days to check the compression strength if they can reach the required MPA as per requirement of the client.

Alfred Vamboi

Mar 9th, 2016

Question : In a 15cm by 15 cm cube what is the Area and how to find the compressive strength of the cube cure for 7days

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