Do we calculate wastage for Cement, 20mm and coarse aggregate in rate analysis for concrete?
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Basically rate analysis is simply a summary of all the cost which is at fault in doing a particular work. For the great analysis, we should be aware of the details about the operation involved in carrying out the work. We should consider the following parameter in mind while doing rate analysis:
Total material cost:
Here I am doing the total material cost calculation for the 1-meter cube of concrete of ratio 1:2:4
Cement = 1.57/(1+2+4) = 1.57/7 =0.22cum x 28.8 = 6.336 bags.
Sand = 0.22 x 2 = 0.44 cum
Aggregate = 0.22 x 4 = 0.88 cum
Cement = 6.336 bags @300Ru.= 1900.8
Aggregate = 0.88 cum @800 per cum
Total Material Cost = 1900.8 + 440 + 704 = 3044.8
I hope so you found my answer helpful.
Please specify the type of wastage you would like to reduce. Because cement sand and aggregate are measured at the initial stage and then for the mix for making a concrete paste. So if mix ratio is correct then there is no probability of wastage of these materials. In some cases, if the mix ratio is not proper then more amount of concrete test it is made by the labour which is considered as the waste. But it depends upon is site engineer and mix ratio. Steel reinforcement is also used in construction, which manufactured in proper length. Thus, some small parts remain in used and considered as waste.
Hope you get the answer.
Material and cost needed for 10 Cu.m of concrete are mentioned below:
The total cost will be addition of above all for 10 Cu.m
Wastage occurs in case of steel reinforcement in concrete construction. Since cement, sand and coarse aggregates are measured and then used as per required quantity based on mix ratio, their wastage does not occur. Steel reinforcement are of specific length and they need to be cut as per drawing. So, some small pieces may remain unused, which is considered as wastage.