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# Soil porosity based on Standard Proctor compaction

## Soil porosity based on Standard Proctor compaction

(OP)
Hi everyone!

I'm willing to know the porosity of two soil samples based the following data (pretty much all I have):

Soil is 43% clay, 21% silt, 30% sand and 5% gravel.
Bulk density is 3.28 g/cm³.
Dry density is 1.73 g/cm³ with 23.6% moisture content at 100% compaction.
Dry density is 1.65 g/cm³ with 21.8¢ moisture content at 95% compaction.

How can I do it? Is there anything missing to calculate the porosity?

### RE: Soil porosity based on Standard Proctor compaction

all that's outstanding is the specific gravity of the soil grains.

f-d

ípapß gordo ainÆt no madre flaca!

### RE: Soil porosity based on Standard Proctor compaction

(OP)
What do you mean by outstanding, fattdad? This is soil from an iron mining area.

### RE: Soil porosity based on Standard Proctor compaction

Consider around 1 x 10-7 to 10-8 cm/sec. for each.

### RE: Soil porosity based on Standard Proctor compaction

(OP)
Thanks oldestguy, but isn't porosity expressed as an adimensional number between 0 and 1 (0% and 100%)?

### RE: Soil porosity based on Standard Proctor compaction

I'm talking permeability, or hydraulic conductivity. That is what you need for design. What would you do with porosity anyhow?

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