Question

A concrete mix design calls for 6.5 sacks of cement, a water/cement ratio of 0.45, and an air content of 2.5%. 1. Complete the mix design usage chart below by filling in the shaded cells. Material Type Description Design Quantity Specific Gravity Volume (ft3 ) Cement Type II lb 3.15 Coarse Aggregate ¾" x #4 1,190 lb 2.75 Coarse Aggregate ⅜" x #8 lb 2.72 Fine Aggregate Concrete Sand 1,453 lb 2.66 Water Mixing Water gal 1.00 Air % by Volume 2.5% - Yield lb - 27.00 2. What is the unit weight of this mix in pcf?

Answer 1

The answer is 28.6 kg

Step-by-step explanation:

The final weight can be calculated from the mixing data and formulae which is given as follows:

cement content = water content divided by (water minus cement ratio)

Therefore:

Cement content = water content/(water - cement ratio)

After all the parameters had been imputed and calculated, we will arrive at a value of 28.6 kg.

Answer 2

28.6 kg

Step-by-step explanation:

The final weight can be calculated from the mixing data and formulae which is given as follows:

cement content =
`(water content)/(water - cement ratio)`

Computing the parameters and checking the tables gives 28.6 kg.