Question

The zero air voids line is established by equation of __________

(a) \(ρ_d=\frac{G}{1+wG}\)

(b) \(ρ_d=\frac{Gρ_w}{wG}\)

(c) \(ρ_d=\frac{ρ_w}{1+wG}\)

(d) \(ρ_d=\frac{Gρ_w}{1+wG}\)

The question was asked in semester exam.

This intriguing question comes from Modified Proctor Test and Harvard Miniature Compaction Test in division Compaction of Geotechnical Engineering I

Answer 1

Right choice is (d) \(ρ_d=\frac{Gρ_w}{1+wG}\)

Easy explanation: The dry density in relation to the water content can be given by the equation,

\(ρ_d=\frac{Gρ_w}{1+wG},\)

where, ρd=dry mass density

ρw= mass density of water

G=specific gravity.