Soil Boiling Method: Testing standard ASTM 854-92
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The video shown is the process of measuring the true density of powder.
Soil particle specific gravity, void ratio, porosity and saturation level testing method:
Aim:
To get the soil particle specific gravity Gs, and according to the experiment to get the three parameters:
1、The soil wet weight γm.
2、Water content W
3、The dried-weight γd
and then to calculate the void ratio E, porosity N and saturation level S.
Provide the general parameters for soil as the reference of engineering application
Instruction:
Void Ratio e : it is the ratio of void volume in soil(Vv) to soil particle volume (Vs) (0≦e≦∞)
Vv
E＝---------------
Vs
Porosity n: It is the ratio of void volume in soil (Vv) to soil bulk volume (V), it is usually represented by percentage (0%≦n≦100%)
V v
N＝------------ 100%
V
Degree of Saturation S: It is the water volume contained in soil(Vw) to void volume (Vv), it is usually represented by percentage (0%≦S≦100%)
V w
S＝-------------------100%
Vv
Unit Weight of Solid Matter γs：It is the ratio of soil particle weight (Ws) to soil particle
volume(Vs)
Ws
γs ＝---------------------
V s
Specific Gravity of Solid Matter Gs：It is the ratio of Unit Weight of Solid Matter (γs) to unit weight of 4ºC water (γw) (it is usually about 2.45 ~ 2.85)
γs
Gs＝-------------- ==>γs＝Gsγw
γw(4 ℃)
γw(4ºC)=1.00g/cm3=1.00t/m3=1000kg/m3=9.8KN/m3=62.4#/ft3
The formula of soil particle specific gravity can be obtained by using experiment
Ws
Gs＝----------------------------Gw
Ws ＋W2 －W1
Ws= dried soil weight
W1= pycnometer + dried soil + water weight
W2= pycnometer + water weight
Gw= Specific Gravity of distilled water at Temperature T ºC
Instrument when using boiling method：
(1)Professional densimeter for soil 0.001g/cm3
(2) Alcohol burner
(3) Tripod
(4) Asbestosis network
(5) Professional pycnometer
(6) Distilled water
(7) Thermometer
(8) Thermostatic-type water tank
(9) Constant temperature oven
Soil particle Specific Gravity, Void ratio, porosity and saturation level test
Professional pycnometer 50cm3：
It is suitable for the soil particle whose size is under #4, the cork with central perforation is good for
air and water out, take 10g soil sample by using 50cm3 pycnometer as shown in the following steps:
Steps:
Soil particle Specific Gravity, Void ratio, porosity and saturation level test: ASTM 854-92.
↓
Put the container on the Weighing platform and touch the –T- to re-zero.
↓
Pour the sample into the container, and then put it on the weighing platform, touch the M for memorizing the weight (Wa)
↓
Filled the pycnometer with liquid and test the temperature T℃，and then put it on the weighing
Platform and touch the M for memorizing the weight (Wb)
↓
Pour out 1/2 liquid from pycnometer, and then pour the sample into the pycnometer completely, boil
it for 10 minutes, and then fill the pycnometer with liquid and cool it to T℃, and then put it with
container on the weighing platform, touch the key M for memorizing (Ww).
Then the density meter will how soil particle true density directly.
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