**Quantity of cement sand and aggregate for 1500** square feet slab and **construction cost of RCC slab in India and ****cost per square feet concrete slab in India**

Roof slab |

quantity of cement sand and aggregate for 1500 square feet slab ,for the roof cast of 1500 square feet building roof slab, you have require Steel bar ,sand, cement and aggregate ,how we calculate quantity of cement, sand, Steel bar and aggregate required ,you know that for the casting of roof slab we used M20 mix concrete.

**●How to calculate material required for roof cast of 1800 square feet building****●How to calculate material required for roof cast of 1000 square feet building****●How to calculate weight of Steel bar of different size****●How to calculate weight of t -beam, l -beam and Sphare shaped Steel****#How to calculate weight of mild steel plate****#How to calculate weight of rectangular shaped Steel bar****#How to calculate weight of rectangular tube shaped Steel bar****#How to calculate weight of square tube shaped Steel bar**

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**What is M-20 mix grade of Concrete**

quantity of cement sand and aggregate for 1500 square feet slab,

In M20 mix concrete M is stand for mix and numerical figure 20 is stand for characteristic of compressive strength 20N/mm2 after mixing and casting of roof slab.

quantity of material in slab formation it calculated by M20 mix in which ratio of sand cement and aggregate is 1: 1.5 :3

**●M-mix Ratio :**-1 : 1.5 : 3 in which one part is cement 1. 5 part is sand and 3 part is aggregate

**Construction cost of RCC slab in India**

For construction cost of RCC slab in India we have to find out quantity of steel, cement bags, fine aggregate and coarse aggregate are required for roof casting of 1500 square feet 5 inch slab

**How to calculate Steel for RCC slab**

● **Steel bar calculation:-** In roof slab there is a two types of Steel bar used main bar and cross bar:-

1) **Main bar:- it** is also called as shortist span bar usually used at bottom of slab having spacing 4 inch between the two bar, main bar used in shorter direction having 10 mm dia of Steel bar.

2) **Cross bar:-** it is also called as longer span bar or distribution bar mainly used at top of the main bar, cross bar usually dia of 8mm Steel bar used in longer direction.

● **Given dimensions:-**

Thickness of slab=5″

Length of slab =50′

Breadth of slab=30′

Area of slab =50’×30’=1500 sqft

M -20 -mix =1:1.5:3 (concrete)

Roof slab |

**●Volume Calculation:**–

1) wet volume=Area × thicknessof slab

Vw= 1500 sqft× 5′

Vw= 1500sqft×5/12′

Vw =625 cft

If you want to convert it into cubic metre you should divide by 35.3147

1m3 =35.3147 cft

Wet volume=625/35.3147=17.698 m3

2) **Dry volume:**–

we know that wet volume have water and bubbles it can be remove by vibrator or compressor machine so more quantity of material is required hence dry volume is increased by 54 percent of wet volume , so we can multiply 1.54 in wet volume to calculate dry volume

Vd =1.54 ×17.698 m3

Dry volume=27.255 m3

**●Weight calculation of Steel**:- quantity of steel required in roof slab is about 0.5℅ to 1% of dry volume then average is 0.75% of dry volume

Weight =0.75%of dry volume×density of steel

Density of steel is=7850 kg/m3

W =0.75/100×27.255m3 ×7850kg/m3

Weight=1602.8 kg

So weight of Steel bar is require for 1500 square feet Roof slab= 1602.8kg

If Market rate of steel bar is 60 rupees per kg then

total cost of Steel bar =1602.8×rs 60

Total cost= Rs 96172

**How much quantity of sand required for Roof cast of rcc slab**

In M20 ratio of sand cement and aggregate is 1:1.5:3 ,in this ratio 1.5 part is sand

Total proportion =1+1.5+3=5.5

Volume of sand in cft

Volume =1.5 /5.5×27.225×35.3147 cft

Volume of sand =262.21 cft

If market rate of 80 rupees per CFT then total cost of quantity of sand

Total cost =rs80×262.21

=Rs 20976

**How much cement is required for roof cast of 1500 square feet RCC slab**

**●Cement calculation:- in** M20 mix 1 part is cement quantity

Weight of cement=1/5.5×dry volume in m3×density of cement

Density of cement=1450kg/m3

Weight =1/5.5×27.255 m3×1450 kg/m3

=7177.5 Kg

1 bag cement =50kg

No.of bags =7177.5/50

=143.55 Bags cement

If market rate of cement is 350 rupees per bags then total cost

Total cost =143.55 ×rs 350

= Rs 50242

**How much course aggregate is required for 1500 RCC roof slab**

**●Aggregate Calculation:- **

**in** M20 mix there is 3 part of aggregate quantity

Volume of aggregate=3/5.5×dry volume in CFT

Volume =3/5.5×27.255×35.3147 cft

Volume =524cft

If market rate of aggregate is is 70 rupees per CFT then total cost of aggregate

Total cost =rs 70×524

Rs=rs 36709

**total cost of material required for 1500 square feet RCC slab**

Cost of steel=rs 96172

Cost of cement=rs 50242

Cost of sand=rs 20976

Cost of stone=rs 36709

Labour charge and machine cost =rs 75000 (approx)

Total cost=Rs 279099

Hence total cost of roof slab of 1500 square feet building require rs 279099

1602.8 Kg steel, 262.21 Cuft sand, 143.55 bags ( 7177.5 kg) cement and 524 Cuft aggregate is required for roof cast of 1500 square feet rcc slab and total cost of material is about rs 279099.

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