Average Weight Calculation of a Concrete Slab with Reinforcement

What is the average weight of a concrete slab based on the actual mass of the concrete and steel materials?

The average weight of the slab (lb/ft²) based on the actual mass of the concrete and steel materials is 27.45 lb/ft².

Calculation of Average Weight:

To determine the average weight of the concrete slab based on the actual mass of the concrete and steel materials, the following steps are taken:

Details of Calculation:

A 10-inch thick concrete slab is constructed with concrete having a density (unit weight) of 143 lb/ft³. The slab is reinforced with No. 7 bottom bars at 8 inches on center each way and No. 6 top bars at 8 inches on center each way.

The average weight of the slab (lb/ft²) based on the actual mass of the concrete and steel materials is calculated using the formula:

Mass = density × volume

Volume of the slab = area × thickness

Thickness of the slab = 10 inches = 10/12 feet

Area of the slab = length × breadth = (8 × 8)/144 = 0.4444 ft²

Mass of concrete in the slab = 143 × 0.4444 × 10/12 = 11.91 lb

The weight of No. 7 bars per foot length of slab = 0.3927 × 0.7 × 1/12 × 7.85 = 0.184 lb

Weight of No. 6 bars per foot length of slab = 0.102 lb

Total weight of the slab = 11.91 + 0.184 + 0.102 = 12.196 lb

Average weight of the slab (lb/ft²) based on the actual mass of the concrete and steel materials is:

Average weight = total weight / area

Average weight = 12.196 lb / 0.4444 ft² ≈ 27.45 lb/ft²

Hence, the average weight of the slab (lb/ft²) based on the actual mass of the concrete and steel materials is 27.45 lb/ft².

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