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What is 1.54 in concrete and what is 1.30 in mortar?

What is 1.54 in concrete and what is 1.30 in mortar and why they are multiplied with wet volume in order to compute dry volume?

Here is the info: What is 1.54 in concrete?

Concrete [Aggregate + Sand + Cement]

While water is included in dry mixture [cement, sand and aggregate] and while the wet concrete mixture is set in shuttering, the particles rearrange themselves into gaps and pores [they’re filled] which lessen the wet mixture volume.

Void ratio compressibility of aggregate: 33 to 34 percent [voids are filled]

Of sand: 20 percent [voids are filled]
Of cement: negligible [because of fine particles]
= 34 percent + 20 percent = 54 percent
Dry volume is greater than 54 percent of wet volume

= 100 divided by 100 + 54 divided by 100 = 1 + 0.54 = 1.54
Dry volume is equal to 1.54 x wet volume

What is 1.30 in Mortar?

Mortar [Sand + Cement]
Void ratio compressibility of sand is 20 percent.
Of cement is slight [because of fine particles]
Therefore, is equal to 20 percent.
Dry volume is more than twenty percent of wet volume
Is equal to 1 + 0.20 = 1.20

Engineers take five to ten percent extra for craft and expenditure.
Therefore, ten percent is included, 1.20 + 0.1 = 1.30
Dry volume is equal to 1.30 x wet volume

Go through the following video tutorial to watch the what is 1.54 in concrete & what is 1.30 in mortar.

Lecturer: TECH@7K