400 kgs of cement act result 70.3
7days result 57.6
28days result 68.9 is good result
But 410kgs of cement act 67.26
7days one cube 49.87 second cube 22.93 third cube 25.33 average 32.7
And 28 days 58.9 is good result.
Q1.observe the two low result in days ?
Q2. Za why the same set of cubes have given god results in 28days steentje in trial?
Q3.what is the reason for huge variation in strength between two average and the individuals.i some cases it has crossed the limit of 15% margin allowed in the standards?