Proportioning concrete concrete mix designs are often given by a ratio. In the design mix method materials are proportioned based on the procedure and rules given in is4562000 and is102622009 codebooks. Enter unit weight of coarse aggregate if unknown use 1500 to 1900 kgm 3 for normal weight aggregate kgm 3 enter fineness modulus of fine aggregate enter from table above volume of coarse aggregate per unit volume of concrete.
Concrete mix design ratio by weight. A sample of fine aggregate weighing 5085 grams is passed over the sieves shown below and the. The procedure for finding the different grades of concrete mixes are same. A table for concrete mixes by weight in kilograms by bag and by cubic meter for various strengths a batch of concrete mixed on site and and moved by wheelbarrow and placed on the foundation floor area. In this method cement sand and aggregates are always batched in terms of weight and concrete can be designed for different environmental conditions and different needs.
Concrete mix design of m5 m75 m10 m15 m20 m25 m30 and higher grades of concrete is calculated as below. Mix designs for concrete block proportioning using the fineness modulus method by neal jablonski using the sieve analysis result below the fineness modulus can be cal culated. Cement sand crushed rock usually the ratio is in terms of weight of the components. There are two methods for selecting the concrete mix proportions by weight basis and by absolute volume basis.
This process is usually adopted for structures which requires higher grades of concrete such as m25 and above and large construction projects where quantity of concrete consumption is huge. Mix design mix design the concrete mix design cmd for qcqa superstructure concrete must produce a workable concrete mixture having properties that will not. The fineness modulus is the sum of the total percentage retained on each of a specified series of sieves divided by 100. Concrete mix for foundation pillar beam and slabs.
The concrete mix design involves various steps calculations and laboratory testing to find right mix proportions. Hence if you prepare concrete using design mix method you can save cost and get good quality of concrete. One is based on the volume of materials other one is based on the weight of materials. The below mentioned method can be applied to any grade of concrete by changing the values.
Design calculation for selecting proportions for initial concrete mix design.