What is the conrete mixing ratio in M25concrete?

The Concrete mixing ratio for M35 grade concrete as per IS Mix design is

• 1:1.6:2.907 (cement:Fineaggregate:Coarse aggregate)
  
• The ratio obtained is as per design calculations by considering the grade of aggregates and the type of cement used.
  
• The Water/cement ration is 0.43