Determination Of Field Density Of Soils By The Core Cutter Method.pdf j1g3e

STUDENT CODE OF ETHIC (SCE) DEPARTMENT OF INFRASTRUCTURE AND GEOMATIC ENGINEERING FACULTY OF CIVIL & ENVIRONMENTAL ENGINEERING

I, hereby confess that I have prepared this report on my own effort. I also it not to receive or give any help during the preparation of this report and pledge that everything mentioned in the report is true.

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FACULTY : CIVIL & ENVIRONMENTAL ENG. DEPARTMENT: INFRASTRUCTURE AND GEOMATIC ENGINEERING TEST TITLE : DETERMINATION OF FIELD DENSITY OF SOILS BY THE CORE CUTTER METHOD

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1.0 OBJECTIVE To determine in-situ density of fine-grained natural or compacted soils free from aggregate using a core cutter.

2.0 LEARNING OUTCOME At the end of this experiment, students are able to:  

Perform the field density test using core cutter method Determine the density of the compacted soil

3.0 THEORY OF THE EXPERIMENT Core cutter method is used for finding field density of cohesive/clayey soils placed as fill. It is rapid method conducted on field. It cannot be applied to coarse grained soil as the penetration of core cutter becomes difficult due to increased resistance at the tip of core cutter leading to damage to core cutter.

4.0 TEST EQUIPMENTS 1) Cylindrical core cutter seamless steep tube, 130mm long 10cm internal diameter with wall thickness of 3mm, bevelled at one end; giving a volume of 1000cm3. 2) Steel dolly, 2.5cm high and 10cm internal diameter with wall tickness of 7.5mm with a lip to enable it to be fitted on top the core-cutter. 3) Steel rammer with solid mild steel foot 14cm diameter and 7.5cm height with a concentrically screwed 2.5cm diameter solid mild steel staff 4) Balance. 5) Palette knife having balde approx. 20cm long and 3cm wide 6) Steel rule. 7) Container for determination of water content. 8) Soil sample = Fine grained soil where 90% of soil es through 4.75mm I.S Sieve

5.0 PREPARATION OF SAMPLE 1) 2) 3) 4)

Calculate the internal volume of core cutter Weight the empty core cutter and record its weight Apply oil on inner surface of core cutter Place the core on a freshly prepared plain ground with dolly on it; and gently hammer it so that the cutter will get pushed in the soil completely 5) Remove the side material and take out the field up core cutter gently and properly trim the top and bottom surface and weight it The soil core shall be removed from the cutter and a representative sample must be placed in an air tight container to determine water content.

FACULT : CIVIL & ENVIRONMENTAL ENG. DEPARTMENT: INFRASTRUCTURE AND GEOMATIC ENGINEERING TEST TITLE : DETERMINATION OF FIELD DENSITY OF SOILS BY THE CORE CUTTER METHOD

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6.0 OBSERVATION TABLE a) Determination of bulk and dry density of soil Determination No. 1

Mass of empty core cutter (M1)

kg

2

Mass of core cutter + wet soil (M2)

kg

3

Mass of wet soil (M2 - M1)

kg

4

Volume of core cutter (V)

m3

5

Bulk density

6

M 2  M1 V  Dry density of soil  d  1 w

b =

1

2

3

1

2

3

kg/ m3

kg/ m3

b) Determination of water content of soil Container No. Mass of empty container with lid

(M1)

g

Mass of container with lid and wet soil

(M2)

g

Mass of container with lid and dry soil

(M3)

g

Mw M2  M3  x100 Md M 3  M1

%

Water content,

w

FACULT : CIVIL & ENVIRONMENTAL ENG. DEPARTMENT: INFRASTRUCTURE AND GEOMATIC ENGINEERING TEST TITLE : DETERMINATION OF FIELD DENSITY OF SOILS BY THE CORE CUTTER METHOD 7.0 COMPUTATION AND RESULTS

8.0 CONCLUSION

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