User talk:ShohanX

'How does the fineness modulus of aggregates affect the strength of concrete?'Bold text

The concrete cube represents to a particular grade of concrete but due to various reasons related to material, workmanship, the cubes fails on different crushing strength values & it become difficult to find the more realistic strength of the concrete from which these cubes have been prepared.

Therefore IS code recommends to use variation of last consecutive 30 test samples from cube testing register for arriving on the strength represented to the concrete. Standard Deviation is a method which is mathematically represented as = under root of [(sum of square of difference of all thirty result from mean) /30). We can use more than thirty result of cube samples from cube register.

'For initial calculations IS code has recommended value of standard deviation for different grade of concrete based on practical experience which are proper storage of cement, weigh batching of all materials, aggregate grading, controlled addition of water in making concrete, regular checking of all materials, moisture content in material, periodical checking of workability & strength of concrete. IS code says if these points are not fallowed properly then increase S.D. value by 1N/mm^2.'' 'Italic text''

By Shohan