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Cement is one of the important ingredient of concrete, generally it is mix in concrete due to adhesive and binding nature with fine and coarse aggregate. A small amount of lime is also added in concrete mix to increase the workability and strength of concrete.

There is different grade of concrete such as M20, M25, M30 and so on, used for RCC flat roof slab casting, in this article we used the nominal mix ratio 1:2:3 (1 part cement is mixed with 2 part sand and 3 part aggregate) those prepared mix concrete have compressive strength of 3000 PSI.

Generally roof slab thickness is kept about 4 inch thick at general a standard used for residential building and thickness of 5 to 6 inch for commercial use, in this article we calculate cement required for RCC roof slab at 4 inch, 5 inch and 6 inch thickness.

Roof slab casting is process of laying and putting concrete mix in horizontal direction and structure over brickwork. Cast of roof slab reinforcement main bar and cross bar in distributed over shuttering areas of roof slab and then we put concrete mix of M20 or m25 grade of concrete that is known as roof slab casting.

**How many cement bags required for 1800 sqft roof slab?**

Roof slab casting is process of laying and putting concrete mix in horizontal direction and structure over brickwork. Cast of roof slab reinforcement main bar and cross bar in distributed over shuttering areas of roof slab and then we put concrete mix of M20 or m25 grade of concrete that is known as roof slab casting.

Generally one bag of Portland cement is weight around 50 kg and their density is 1440 kg/m3.

**Calculate how many cement bags required for 1800 sq ft roof slab at 6 inch thick**

● Given details:-

1) thickness of roof slab = 6″

2) mix ratios = 1:2:3

3) Area of roof slab = 1800 sq ft

4) Density of cement =1440kg/m3

5) 1 bag cement weight = 50 kg

● Calculation of wet volume of concrete:- you can determine quantity of concrete by calculating its volume by multiplying square footage of roof slab with their thickness such as – 1) thickness in feet = 6/ 12 = 0.5 feet, 2) wet volume of concrete = 1800 sq ft × 0.5 feet = 900 cubic feet, thus you will need 900 cubic feet of wet volume of concrete for 1800 sq ft rcc roof slab

● Dry volume:- we know that wet volume have voids and pore which filled with water and bubbles it can be remove by vibrator or compressor machine so more quantity of material is required that is dry volume. Volume of dry concrete is increased by 54%, so we can multiply 1.54 in wet volume to calculate dry volume. Dry volume of concrete = 900 cubic feet × 1.54 = 1386 cubic feet. Thus you will need 1386 cubic feet of dry volume of concrete for 1800 sq ft rcc roof slab

● Mix ratio:- 1:2:3 mix ratio (1 part cement is mixed with 2 part sand and 3 part aggregate) is used for prepairing concrete mix. Add this mix ratio 1+2+3 = 6, part of cement in mix = 1/6.

● Calculate cement for 1800 sq ft roof slab:-

1) cement quantity in cubic feet =1/6 × dry volume of concrete, 1386 ÷6= 231 cubic feet approx

2) cement quantity in cubic meters =1/6 × dry volume of concrete ÷ 35.32, (1386 ÷6) ÷ 35.32 = 6.54 cubic meters approx

3) cement quantity in kg = cement quantity in m3 × 1440 kg/m3 = 6.54 × 1440 = 9418 kg approx

4) cement quantity in No. of bags = cement quantity in kg ÷ 50 kg = 9418 ÷ 50 = 188 bags approx.

**Conclusions**:-

For a 1800 sq ft rcc roof slab casting at 6 inch thick, generally you will need 188 bags (around 9418 kg) of cement which is approximately equal as 231 in cubic feet or in 6.54 cubic meter by using 1:2:3 (cement: sand: aggregate) mix to gain 3000 Psi compressive strength of concrete in 28 days. Thus 188 bags of cement are required for 1800 sq ft rcc roof slab at 6 inch thick.

**Calculate how many cement bags required for 1800 sq ft roof slab at 5 inch thick**

● Calculation of wet volume of concrete:-

1) thickness in feet = 5/ 12 = 0.416 feet, 2) wet volume of concrete = 1800 sq ft × 0.416 feet = 749 cubic feet

● Dry volume of concrete = 748 cubic feet × 1.54 = 1154 cubic feet. Thus you will need 1154 cubic feet of dry volume of concrete for 1800 sq ft rcc roof slab at 5 inch thick

● Calculate cement for 1800 sq ft roof slab:-

1) cement quantity in cubic feet =1/6 × dry volume of concrete, 1154 ÷6= 193 cubic feet approx

2) cement quantity in cubic meters = volume of concrete in cubic feet ÷ 35.32, (193 ÷ 35.32 = 5.47 cubic meters approx

3) cement quantity in kg = cement quantity in m3 × 1440 kg/m3 = 5.47 × 1440 = 7877 kg approx

4) cement quantity in No. of bags = cement quantity in kg ÷ 50 kg = 7877 ÷ 50 = 158 bags approx.

Conclusions:-

For a 1800 sq ft rcc roof slab casting at 5 inch thick, generally you will need 158 bags (around 7877 kg) of cement which is approximately equal as 193 in cubic feet or in 5.47 cubic meter by using 1:2:3 (cement: sand: aggregate) mix to gain 3000 Psi compressive strength of concrete in 28 days. Thus 158 bags of cement are required for 1800 sq ft rcc roof slab at 5 inch thick.

**Calculate how many cement bags required for 1800 sq ft roof slab at 4 inch thick**

● Calculation of wet volume of concrete:-

1) thickness in feet = 4/ 12 = 0.33 feet, 2) wet volume of concrete = 1800 sq ft × 0.33 feet = 594 cubic feet

● Dry volume of concrete = 594 cubic feet × 1.54 = 915 cubic feet. Thus you will need 915 cubic feet of dry volume of concrete for 1800 sq ft rcc roof slab at 4 inch thick

● Calculate cement for 1800 sq ft roof slab:-

1) cement quantity in cubic feet =1/6 × dry volume of concrete, 915 ÷6= 153 cubic feet approx

2) cement quantity in cubic meters = volume of concrete in cubic feet ÷ 35.32, (153 ÷ 35.32 = 4.33 cubic meters approx

3) cement quantity in kg = cement quantity in m3 × 1440 kg/m3 = 4.33 × 1440 = 6235 kg approx

4) cement quantity in No. of bags = cement quantity in kg ÷ 50 kg = 6235 ÷ 50 = 125 bags approx.

**Conclusions**:-

For a 1800 sq ft rcc roof slab casting at 4 inch thick, generally you will need 125 bags (around 6235 kg) of cement which is approximately equal as 153 in cubic feet or in 4.33 cubic meter by using 1:2:3 (cement: sand: aggregate) mix to gain 3000 Psi compressive strength of conc sq ft rcc roof slab

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**Final conclusions**:-

For a 1800 sq ft rcc roof slab casting at 4 inch thick, generally you will need 125 bags (around 6235 kg) of cement, at 5 inch thick – 158 bags (around 7877 kg) and at 6 inch thick – 188 bags (around 9418 kg) of cement are required by using 1:2:3 (cement: sand: aggregate) mix to gain compressive strength of 3000 Psi concrete in 28 days.