RATE ANALYSIS OF CONCRETE WORK

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Introduction: There is need unit rate to analyze the rate of concrete work. This unit of rate is supposed 10 cubic meter or 100 cubic feet. To do find  the materials quantity So, we have need to analyzed  the unit rate. As you know that concrete is prepared in the wet form. This quantity we change into dry quantity do multiply by 1.54. After the find of concrete work's rate that time we also include cost of labor and cost of materials. There is found the concrete's components like fine aggregates, course aggregate and cement from the dry materials volume. Before the start our work we must have calculator for calculation .  First of all we find the sum  . For example, we have the ratio of concrete is 1:2:4. Then we find its sum by this formula.

Cement +Fine aggregate+ Course aggregate=Sum of components
              1 : 2 : 4 = 7



Second we find the quantity of material by this formula.

Quantity of material = Ratio of material  ÷  Sum of ratio × dry material of concrete
Now,  we try  to analyze the 100  Cft cement  concrete  quantity according to  the ratio of  (1:2:4)  in F.P.S . System.
Solution:
                Quantity of wet material =   100  Cft
                Quantity of dry material =   100  ×  1.54 = 154 Cft
                Ratio of concrete =   1  :  2  :  4
Now  we  find sum of this ratio (1  :  2  :  4)
                  =   1  +  2 +  4   =   7
1. First of all we find the quantity of cement  by this formula.
Cement quantity = Cement ratio/Sum of ratio × Dry material
                = 1 / 7 ×   154   =   22 Cft
The volume of one bag cement is equal to 1.25
Then we find the bags to divide the volume of bag (1.25)   from the found out the cement quantity (22).
                = 22  ÷   1.25  = 17.6 Say 18 bags.
2.In second step we will find the quantity of sand.
Sand quantity = Sand ratio / Sum of ratio × Dry material.
                Sand quantity  =  2 / 7 ×  154  =  Say 44 Cft sand.
3. In third step we will find the quantity of aggregates by this formula.
Quantity of aggregates =  Ratio  of  aggregates / Sum of ratio × Dry materials.
                Quantity of aggregates  = 4  /  7 × 154  =  Say 88 Cft aggregates quantity.
Cost of material:

                                     18 bags cement @Rs.690/bag = 18 × 690 = 12420.
                                     44 Cft sand @Rs.200/50 =  44 × 200/50 = 176
                                     88 Cft bajri @ Rs.300/50 = 88 × 300/50 = 52
Total cost of material = 12420 + 176 + 528 = 13124 amount

Note:
          These are not exact rates of materials just for understanding.
Cost o f carriage :
                                18 bags cement @Rs.500/50 means (1 load =50 Cft ) = 18 × 500 / 50 = 180 say 200
                                44Cft sand @Rs.500/50 =  44 × 500 / 50  = 440 say 500

                                88 Cft bajri @Rs.500/50 = 88 × 500 / 50 = 880 say 90
Total cost of carriage: 200 + 500 + 900 = 1600