Saturday, 2 January 2016

Grade of concrete

Characteristic strength is defined us the strength of material below which not more than 5% of test results are expected to full. 

The concrete grade M10, M15 and M20 are termed as ordinary concrete and those of M25 to M55 are termed as standard concrete and the concrete of grade 60 and above are termed as high strength concrete. 

 The selection of minimum grade of concrete is dictated by durability considerations which are based on kind of environment to which the structure is exposed, though the minimum grade of concrete for reinforced concrete is specified as M20 under mild exposure conditions, it is advisable to adopt a higher grade.  

 For moderate, severe, very severe and extreme exposure conditions, M25, M30, M35 & M40 grades respectively are recommended.

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