The image above represents relative compaction.

To compute for relative compaction, two essential parameters are needed and these parameters are **Field dry density (ρ _{d field}) **and

**Maximum dry density (ρ**

_{d max}).The formula for calculating relative compaction:

R_{c} = ^{ρd field} / _{ρd max}

Where:

R_{c} = Relative Compaction

ρ_{d field} = Field Dry Density

ρ_{d max} = Maximum Dry Density

Let’s solve an example;

Find the relative compaction when the field dry density is 44 and the maximum dry density is 11.

This implies that;

ρ_{d field} = Field Dry Density = 44

ρ_{d max} = Maximum Dry Density = 11

R_{c} = ^{ρd field} / _{ρd max}

R_{c} = ^{44} / _{11}

R_{c} = 4

Therefore, the **relative compaction **is **4.**

**Calculating for the Field Dry Density when the Relative Compaction and the Maximum Dry Density is Given.**

ρ_{d field} = R_{c} x ρ_{d max}

Where;

ρ_{d field} = Field Dry Density

R_{c} = Relative Compaction

ρ_{d max} = Maximum Dry Density

Let’s solve an example;

Find the field dry density when the relative compaction is 25 and the maximum dry density is 4.

This implies that;

R_{c} = Relative Compaction = 25

ρ_{d max} = Maximum Dry Density = 4

ρ_{d field} = R_{c} x ρ_{d max}

ρ_{d field} = 25 x 4

ρ_{d field} = 100

Therefore, the **field dry density **is **100.**

Continue reading How to Calculate and Solve for Relative Compaction | Soil Mechanics and Foundation