factors affecting mix design of concrete

The grade M20 defines characteristic compressive strength fck of 20 N/m2. Based on the degree of control accessible at construction site, the concrete mix should be designed for a target mean compressive strength (fck) with the use of proper standard deviation.

Type of cement

The rate of development of concrete strength is dependent on the type of cement.

If the strength of cement applied in concrete becomes greater, the cement content will be lower. If 43 grade and 53 grade of cement are utilized, the intake of cement will be saved as much as 15% & 25% relatively with regard to 33 grade of cement. For concrete of grade M25, application of 43 and 53 grade of cement are recommended.