Proctor Compaction

γ_{d} = \frac{γ}{1 + w} γ_{d, m a x} at w_{o pt}

Dry unit weight γd = γ/(1+w). Standard vs modified Proctor (different energy). Field compaction is specified as a percent of γd,max (e.g. 95%) at w near wopt. Zero-air-voids curve is the upper bound (S=100%).

$γ_{d}$: Dry unit weight
$w$: Water content
$w_{o pt}$: Optimum water content

Step-by-step solved example

Moist γ=19.6 kN/m³ at w=12%. γd?

Dry unit weight vs water content; peak at w_opt.

1. Formula
γd=19.6/1.12=17.5 kN/m³.
$γ_{d} = 17.5 kN / m^{3}$

Answer: 17.5 kN/m³

10 practice questions

0/10 correct

1.γd equals

2.wopt is where

3.Modified Proctor vs standard: γd,max is

4.The ZAV curve is

5.95% compaction means

6.Line of optimums typically

7.If a sample is too wet of optimum, γd

8.Nuclear gage measures

9.w=0.10, γ=20 kN/m³. γd=

10.Relative compaction is not the same as