Construction Cost Estimating

      

RCC (Reinforcement Cement Concrete) Rate Analysis - What You Need to Know

Today, we will learn the process of how to calculate the RCC Rate Analysis. First you have to know how to estimate the cost estimates of materials, equipment and various items for specific quantity of reinforced concrete.

Next, we should find out the structural elements for the structure for which you are doing the rate analysis. This is because the concrete mix design affects the cost of the RCC.

RCC, or reinforced cement concrete, is basically a mix of Cement + Sand + Aggregate poured and solidified around reinforcement steel.

The ratio of the above can vary a lot depending upon the needs of the structure, for example – 1:0.5:1, 1:1:2, 1:1.5:3, 1:2:4, 1:3:6 etc. The third ratio is the most commonly used in residential and commercial construction.

Example of RCC Rate Analysis Table:

R.C.C. work of M-20 grade with 20mm and down grade black hard granite (crusher broken) stone chips including hoisting and laying Data for 10 cu.m.
Sr No. Description Qty Unit Rate Cost
  Details of cost for 10.00 Cu.m.        
A Labor Charges        
1 Mason -1 st 0.5 Day 700.00 350.00
2 Mason -2nd 0.5 Day 600.00 300.00
3 Bhisti 2.70 Day 400.00 1080.00
4 Coolie 6.00 Day 400.00 2400.00
5 Mate 0.4 Day 500.00 200.00
B Material
Cement 85.20 Bag 320.00 27264.00
Wastage Extar 2% 545.28
Sand 4.43 Cu.m. 1325 5869.75

Aggregate 20 mm 5.40 Cu.m. 1125 6075.00
Wastage Extra 5% 303.75
Aggregate 20 mm 3.60 Cu.m. 1110 3996.00
Wastage Extra 5% 199.80
Aggregate 20 mm 200.00 Cu.m. 56 11200.00
Wastage Extra 2% 224.00
C Hire and Running Charges of Mech Mixer 5% 2804.42
D Transportation Cost 1% 1% 560.88
E Other Charges 2 % Extra 2% 1208.37
F Add for Water Charge @ 1% on Items Marked 1% 604.18
G Add for Contractor's Profit @15% on Items Marked 15% 9062.77
  Cost of 10.00 Cu.m. 74009.09
  Cost of Cu.m. 7400.91
  Round off Cu.m. 7401.00

You can use the above table in a spreadsheet to calculate the RCC rate analysis too.

Sample calculation of RCC Rate Analysis

1. Cement calculation

We have,
Wet Cement volume = 1.25 times of Dry cement.

The dry volume of concrete decreases volume of wet cement mortar because of the added water and expansion.

Wastage of cement mortar = 30 % (1.25) extra.

Therefore, Cement calculation requirement of cement
= 1 x 1.25 x 1.30
= 1.625 cu.m,

Here, calculation concrete ratio is 1:1.5:3.

So, the required amount of Cement quantity at concrete

= 1.625 Cu.m. x (1/(1+1.5+3))
= 1.625 x 0.1819
= 0.2956 cu.m. cement is required.

Now, Cement in kg = volume x density of cement (1440 kg/m)

Therefore, Cement in kg

= 0.2956 cu.m. x 1440
= 0.2956 x 1440
= 425.646 kg of cement

Bags of cement required (assuming one cement bag weighs 50 kg)

= 425.646 / 50
= 8.51 bags

So, for 10 cu.m. concrete the requirement of cement

= 8.52 x 10
= 85.20 bags

2. Sand calculation

We have:

Required amount of Sand
= 1.625 Cu.m. x (1.5/(1+1.5+3))
=0.443 Cu.m.

So, for 10 cu.m. concrete, the requirement of sand
= 0.443 x 10
= 4.43 cu.m.

3. Aggregate calculation

We have:

The required amount of Aggregate
= 1.625 Cu.m. x (3/(1+1.5+3))
= 0.90 Cu.m.

There are two types of aggregate – 20 mm & 10 mm in size. The aggregate consists them in this ratio of 60 % of total aggregate 20mm size, 40 % of total aggregate 20mm size.

So, 20 mm aggregate
= 9.0 cu.m. x 60%
= 5.4 cu.m.

10 mm aggregate
= 9.0 cu.m. x 40%
= 3.6 cu.m.

4. Reinforcement calculation

Let’s say, we are using reinforcement 2% of the total volume of concrete.

Therefore, 1 cu.m. concrete for reinforcement
= 1.0 x 2%
= 0.02 ton of steel

So, for 10 Cu.m concrete, requirement of steel
= 0.02 ton x 10 cu.m.
= 0.20 ton
= 200 kg

Labor costs for Rate Analysis of Concrete

As CPWD Mate per cu.m. 0.27 of day bhisti, per cu.m.0.6-day coolie, per cu.m. 0.05-day Mason -2nd, per cu.m. 0.05-day mason 1st, per cu.m. 0.04-day mate.

Extra Changes in rate analysis will be as per the following.

- Scaffolding 1% Extra
- Transportation Cost 1%
- Other Charges 2 % Extra (Electrical, and site extra expense)
- Add for Water Charge @ 1% on Items Marked
- Add for Contractor’s Profit @15% on Items Marked

RCC Rate Analysis - What You Need to Know