Today we’ll see the way to prepare rate analysis for Reinforced Concrete (RCC) work. initiative to rate analysis is that the estimation of labour, materials, equipment’s and miscellaneous things for specific amount of Reinforced Concrete.
The second step is to see the element of structure that the RCC rate analysis is needed, because the amount of reinforcement steel varies with slabs, beams, columns, foundation, RCC Roads etc., tho’the number of different materials like sand, coarse aggregate and cement stay the identical with the same combine style (mix proportion) of concrete.
Labour rates for reinforcement work changes with variety of structural element because the amount of reinforcement steel changes. The number of materials like sand, cement and coarse aggregates vary with combine style like M15 (1:2:4), M20 (1:1.5:3), M25, M30 etc..
Here we will see the rate analysis for 1m3 of reinforced concrete.
Data required for RCC Rate Analysis:
1. Estimation of materials:
Material estimation embody sand, cement, coarse mixture and steel for a specific combine style. allow us to think about a mixture style of 1:1.5:3 for our estimation apply. The dry volume of total materials needed is taken into account as 1.54 times the wet volume of concrete, thanks to voids gift in sand and aggregates in dry stage. Therefore, for our calculation, we are going to think about the entire volume of materials needed as 1.54 M3 for 1M3 of wet concrete.
a) Bags of cement required:
Volume of cement required for 1m3 of Concrete =
Then number of bags of cement (volume of one bag of cement = 0.0347 m3)
== 8.07 bags of cement.
b) Volume of Sand required:
Volume of sand required = = 0.42 m3 of sand.
c) Volume of Coarse Aggregate Required
Volume of Coarse Aggregate == 0.84 m3 of coarse aggregates.
d) Estimation of Reinforced Steel:
Quantity of steel needed depends on elements of structure, i.e. slabs, beams, columns, foundations, roads etc. To estimate the steel needed, there are 2 strategies.
First methodology is, after we have the drawing on the available, we will calculate the entire weight of steel needed divided by total volume of concrete for various elements. this may provide weight of reinforcement steel per cubic meter of concrete. .
Second methodology is presumptuous the share of reinforcement for various elements. Following are the share of reinforcement steel typically needed per completely different elements. Its values will vary from structure to structure, and may be assumed from past experiences of comparable structure.
For slabs = 1.0 % of concrete volume.
For Beam = 2 % concrete volume.
For column = 2.5 % of concrete volume.
For RCC Roads, 0.6% concrete volume.
Lets take example of RCC Column, where reinforcement required is 2.5% of concrete volume, weight of steel required will be:
Labour demand for 1m3 of RCC:
Labours needed are bestowed in terms of days required by specific labour to finish its work for the given amount of concrete. Following are the assorted labours required:
a) Mason: As per customary Schedule of Rates and Analysis of Rates, One mason is needed for 0.37 days.
b) Labours: One Unskilled labours needed for 3.5 days.
c) Water carrier: One water carrier needed for 1.39 days.
d) Bar Bender: Bar bender demand depends on weight of reinforcement. Lets contemplate one bar bender needed for a hundred kilo of steel as for one day.
e) Mixer Operator: One mixer operator needed for 0.0714 days.
f) Vibrator Operator: One vibrator operator needed for 0.0714 days.
Equipments and sundries: Equipment and different charges, like water charges, miscellaneous things, tools and tackles etc may be assumed as some proportion of total value of materials and labours. let’s imagine it as 7.5%.
Contractor’s Profit: Contractor’s profit depends on place to position, organization to organization and work to figure. It varies from ten – twentieth. For our case lets assume it as fifteenth of total value of materials, labours and equipments.
We have calculated the number of each item in on top of one – three steps. For rate analysis of RCC, we want to multiply every quantity with their rates to urge the quantity for each item of labor. Rates vary from place to position and time to time. it’s suggested to assume native rates or customary rates of the place.
The summation of all the four things on top of can provide the speed or value for 1m3 of concrete.
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