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Geotechnical and Foundation Engineering
September 21, 2016
EXPERIMENT#1
CALIBRATION OF SPEEDY MOISTURE METER ASTM D2216, ASTM D4944-04
OBJECTIVE
To compare compare the moistu moisture re contents obtained obtai ned from oven dry method with the moisture contents find out by speedy moisture meter. meter. To find some relation rel ation with the moist moisture ure contents obtain from oven dry and speedy moisture meter. meter.
APPARATUS Speedy moisture meter Two Two 1.25-inch 1.25- inch steel balls Cleaning brush and cloth Scoop for measuring calcium carbide reagent Calcium carbide reagent Container Balance sensitive to 0.01gm Oven with accurate temperature.
RELATED THEORY MOISTURE CONTENT (W) It is defined as the rate of the weight of water in a given volume of soil to the weight of the solid particles in that same volume. W=
× 100
Where
Ww = Weight of of soil water in grams Ws = Weight of soil in grams grams (oven dried weight weight of soil)
LIMITATIONS This test method method requires specimens specimens consisting consisting of soil soil having all particles smaller than the No. 4 sieve size. This test method may may not be as accurate accurate as other accepted methods such as oven dry method. Inaccuracies may result because because specimens specimens are too small to properly represent represent the total soil, from clumps of soil not breaking up to expose all the available
The University of Lahore
1
Geotechnical and Foundation Engineering
September 21, 2016
water to the reagent and from other inherent procedural, equipment or process inaccuracies. Therefore, other methods may be more appropriate when highly accurate results are required, or when the use of test results is sensitive to minor variations in the values obtained.
PROCEDURE We performed the experiment in two main steps. In first step we find the moisture content by speedy moisture meter and for this we performed the experiment in the following sequence:
Weigh a 6g soil sample on the tarred scale and place in the cap of the tester. Place three scoops of calcium carbide and two 1.25-inch steel balls in the larger chamber of the moisture tester. With the pressure vessel in an approximately horizontal position insert the cap in the pressure vessel and seal it by tightening and clamp, taking care that no carbide comes in contact with the soil until a complete seal is achieved. Raise the moisture meter to the vertical position so that the soil in the cap will fall into the pressure vessel. Shake the instrument vigorously so that all the lumps are broken up to permit the calcium carbide to react with all available free moisture. When the needle stops moving, read the dial while holding the instrument in a horizontal position at an eye level. Record the dial reading. The dial reading is the percent of moisture by wet mass and must be converted to dry mass. =
sp 1 − sp
× 100 %
Then in second steps we find the moisture content by an oven dry method. For this we performed the remaining experiment in the following sequence
We took a container which had been marked with a specific number, and placed some soil in the container and weighed it. Then we placed this container in the oven for 24 hours. After 24 hours we weigh the container again, and find the weight of the water. Then find the moisture content by applying the following formula:
W=
× 100 %
At the end, we plot the graph between moisture content obtained by speedy moisture and oven dry method. And we find a relation between these two moisture contents.
The University of Lahore
2
Geotechnical and Foundation Engineering
September 21, 2016
OBSERVATION & CALCULATIONS
group#
can#
Empty weight of can
Wet weight of soil & can
Dry weight of soil & can
Moisture content
G
G
g
%
Wet
Dry
M.C
Moisture content from speedy moisture meter (%)
1
R5
11.04
34.76
31
18.84
15.4
18.20
18.20
2
C6
12.37
37.49
32
27.97
18
21.95
21.95
3
R6
11.53
35.35
32.5
13.59
11.6
13.12
13.12
4
R2
11.72
31.61
30
8.81
7.6
8.23
8.23
Calibration Graph 25.00 y = 0.7106x + 3.0808 20.00
) % ( y r 15.00 d n e v o 10.00 m o r f C . M 5.00
0.00 0.00
5.00
10.00
15.00
20.00
25.00
30.00
Wsp (%)
Calibration equation = 0.716 + 3.0808
The University of Lahore
3
Geotechnical and Foundation Engineering
September 21, 2016
REFERENCE
ASTM D2216-98
Standard Test Method for Laboratory Determination of Water (Moisture) Content of Soil and Rock by Mass
ASTM D4944-04
Standard Test Method for Field Determination of Water (Moisture) Content of Soil by the Calcium Carbide Gas Pressure Tester
COMMENTS This test method is not intended as a replacement for oven drying method; but as a supplement when rapid results are required, when testing is done in field locations, or where an oven is not practical for use. Oven drying method is to be used as the test method to compare for accuracy checks and correction The speedy moisture meter/tester is basically used to calculate the moisture content of soil in field. But some time speedy moisture meter does not give the correct moisture content and we perform its calibration and get calibration equation for the correct result. In our result the Calibration equation is = 0.716 + 3.0808
The above equation shows that to get the correct M.C we put the value of moisture content obtained from speedy moisture meter in above equation.