### HOW TO CALCULATE DRY VOLUME OF CONCRETE AND WHAT IS 1.54?

**HOW TO CALCULATE DRY VOLUME OF CONCRETE FOR CONCRETE WORK**

For concrete calculation, we always multiply Wet volume (actual required for work after mixing) with 1.54 to get dry volume.

we take a example of concrete cube with dimensions 1m x 1m x 1m which means 1 cu.m wet volume.

When we convert this wet volume into dry volume, the volume is increased by 54% of wet volume.

∴ Dry volume = Wet volume + 54% of Wet volume

= 1 + (54/100) x 1 =1 + 0.54 = 1.54 cu.m

**WHAT IS 1.54?**

Now the one question comes in our mind that what is 1.54 and we we multiply it with wet volume. so here is the explanation

After adding water the volume of concrete ingredients is reduced to a certain volume. It is happened due to the presence of air voids and pores in dry volume of material.

To understand this, we need to know the air voids and pores containing capability of concrete ingredients.

- Coarse aggregate (stone/brick chips) – 32% to 34%
- Fine aggregate (sand) – 20% to 27%

Due to very fine particles, air voids capability of cement is ignored.

If we take the highest percentage of air voids in both

*coarse and fine aggregates*, we get,
= 34% + 27%

= 61%

But when sand and cement is mixed with coarse aggregate, it evaporates some air voids from the coarse aggregate. The percentage of this is 5% to 7%.

If we deduct this, we’ll get,

= 61% – 7%

= 54%.

That means the dry volume of concrete ingredients is reduced 54% after adding water. in other words, the wet volume of concrete is increased by 54% in the dry condition.

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