Void ratio, e, is the volume of voids, Vv, divided by the soil volume Vs.
Total mass, M=37.82-16.15=21.67
Mass of solids, Ms=34.68-16.15=18.53
Gs=S.G. of soil particles = 2.7
=>
Vol of soil,
Vs=Ms/Gs=18.53/2.7=6.863 mL
air-void content, ac=0
=>
all voids are filled with water, or soil is saturated => Vv=Vw
Vol of water,
Vw=(M-Ms)/ρw=(21.67-18.53)/1=3.14
(a)
Void ratio,
e=Vv/Vs=Vw/Vs=3.14/6.863=0.458
(b)
Air-void content,
ac=Va/Vv=5%
=>
Vv=Va/ac
=Vw/(1-ac)
=3.14/(1-0.05)
=3.305
e=Vv/Vs=3.305/6.863=0.482
An oven tin containing a sample of moist soil was weighed and had a mass of 37.82 g; the empty tin had a mass of 16.15 g. After drying, the tin and soil were weighed again and had a mass of 34.68 g.
Assuming GS = 2.70, determine the void ratio of the soil if the air-void content is:
Zero
5%
need help when the void content is 5%!
1 answer
1 answer