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| Statistical interpretation of cube results |
A number of factors can influence the results of the cube test like material, their proportions, various processes like mixing, compaction and curing and finally the testing procedure of cubes. Even the results of different cubes cast from the same concrete at the same time, cured and tested in similar way may also show different results. Therefore, for evaluation of the test results, the help of statistical approach is required.
When the test results of a large number of cubes, prepared under similar conditions, are plotted on a histogram, the results are found to follow a definite “bell shaped curve” known as “Normal Distribution Curve”. It will be further observed that a large number of cubes will have the strength near the mean value and the no. of cubes having more or less strength will reduce progressively depending upon the difference from the mean value. This deviation in strength represents quality control in the field.
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