specific gravity
Ysoil/Ywet
Unit weight of soil
Ysoil=Wtotal/Vtotal
Water Content
(Wwater/Wsoil)*100%
Void Ratio
e=Vvoids/Vsolids
Degree of saturation
Sr=(Vwater/Vvoids)*100%
Porosity
n= Vvoids/Vtotal
Relative Density
Dr=(emax-efield)/(emax-emin)
How to find wet unit weight
Wtotal/Vtotal
what kind of property is soil compaction
index property
what is reduced during soil compaction
the air voids
name the reasons soil compaction is used for
- increase soil strength
- reduce soil settlement
- reduce soil permeability
what factors affect soil compaction
- soil type
- water content
- compaction effort (energy)
what are the methods of soil compaction
- vibration
- impact loads
- kneading action
- pressure
why is water added during soil compaction
to lubricated the contact surfaces of the soil and improve the compressibility
how many methods of soil compaction are in the laboratory
3
does the modified proctor test have a higher energy compared to the standard proctor
yes
what two parameters are used to find the soil compaction curve
dry unit weight and moisture content
what is relative compaction used to determine
the maximum dry density in the field
How do you find the effective diameter from the particle size distribution curve
it is the size that corresopnds to the D10 value
how do you find the coefficient of uniformity (Cu)
D60/D10
How do you find the coefficient of curvature
(D30)^2/D60*D10
is grain size distribution considered an index property
yes
what are the methods of grain size distribution
Dry and wet
Unit weight of dry soil
Wsoil/Vtotal
