Unconfined Compression Test Calculation And Result j5c1i
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7.0 EXPERIMENTAL DATA 1. Initial diameter of specimen, D0 =3.8cm 2. Initial length of specimen , L0 =7.5cm
π d2 4
3. Initial C/S area of specimen ,
Ao=
4. Volume, v
= A o x Lo
= 11.34cm2 = 11.34 x 7.5 =85.05cm 3
5. Initial density of soil, ρ =m/v 6. Initial water content of soil, W= 15% 8.0 OBSERVATION TABLE Specimen 1 S.N o
Elapsed time ‘t’ (minute s)
1.
0.50
2.
1.00
3.
1.50
4.
2.00
5.
2.50
6.
3.00
7.
3.50
Strain dail reading ∆L (mm) 0.8 1.6 2.4 3.2 4.4 5.6 6.8
Axial strain, (ԑ) L/L0x100 (%) 1.1
Correcte d area Ac=A0/1ԑ) (cm) 11.40
Axial load P(N)
0.022
Provin g ring readin g (div) 11
2.1
Compressive stress, σ= P/A (N/cm2) x10-3 1.929
11.57
0.04
20
3.457
3.2
11.70
0.05
25
4.274
4.3
11.83
0.064
32
5.409
5.9
12.00
0.07
35
5.833
7.5
12.19
0.074
37
6.071
9.1
12.37
0.076
38
6.144
Axial strain, (ԑ) L/L0x100 (%) 1.1
Correcte d area Ac=A0/1ԑ) (cm) 11.40
Compressive stress, σ= P/A (N/cm2)
0.018
Provin g ring readin g (div) 9
1.57x10-3
2.1
11.57
0.014
7
1.578x10-3
3.2
11.70
0.01
5
1.210x10-3
0
0
8.547x10-4
Specimen 2 S.N o
Elapsed time ‘t’ (minute s)
1.
0.50
2.
1.00
3.
1.50
4.
2.00
Strain dail reading ∆L (mm) 0.8 1.6 2.4
4.3 11.83 3.2 *this specimen is fail due to compaction* Specimen 3
Axial load P(N)
S.N o
Elapsed time ‘t’ (minute s)
1.
0.50
2.
1.00
3.
1.50
4.
2.00
5.
2.50
6.
3.00
7.
3.50
Strain dial reading ∆L (mm) 0.8 1.6 2.4 3.2 4.4 5.6 6.8
Axial strain, (ԑ) L/L0x100 (%) 1.1
Correcte d area Ac=A0/1ԑ) (cm3) 11.40
Axial load P(N)
Compressive stress, σ= P/Ac (N/cm2) x10-3
0.016
Provin g ring readin g (div) 8
2.1
11.57
0.02
10
1.728
3.2
11.70
0.028
14
2.390
4.3
11.83
0.038
19
3.212
5.9
12.00
0.054
27
4.500
7.5
12.19
0.064
32
5.250
9.1
12.37
0.064
32
5.174
CALCULATIONS Taking specimen 1, 0.50min as an example Axial strain, ε = (∆L/L0) x 100 (0.8/75) x 100 = 1.1 Corrected area, Ac = (ε+100)/100 x Ao = (1.1+100)/100 x 11.34 = 11.40cm 2 Axial load, P (N) = proving rings reading x 0.002N/Div 11 x 0.002 =0.022 Compressive strength, σ = P/Ac = 0.022/11.40 =1.929x10 -3N/cm3
1.404
π d2 4
3. Initial C/S area of specimen ,
Ao=
4. Volume, v
= A o x Lo
= 11.34cm2 = 11.34 x 7.5 =85.05cm 3
5. Initial density of soil, ρ =m/v 6. Initial water content of soil, W= 15% 8.0 OBSERVATION TABLE Specimen 1 S.N o
Elapsed time ‘t’ (minute s)
1.
0.50
2.
1.00
3.
1.50
4.
2.00
5.
2.50
6.
3.00
7.
3.50
Strain dail reading ∆L (mm) 0.8 1.6 2.4 3.2 4.4 5.6 6.8
Axial strain, (ԑ) L/L0x100 (%) 1.1
Correcte d area Ac=A0/1ԑ) (cm) 11.40
Axial load P(N)
0.022
Provin g ring readin g (div) 11
2.1
Compressive stress, σ= P/A (N/cm2) x10-3 1.929
11.57
0.04
20
3.457
3.2
11.70
0.05
25
4.274
4.3
11.83
0.064
32
5.409
5.9
12.00
0.07
35
5.833
7.5
12.19
0.074
37
6.071
9.1
12.37
0.076
38
6.144
Axial strain, (ԑ) L/L0x100 (%) 1.1
Correcte d area Ac=A0/1ԑ) (cm) 11.40
Compressive stress, σ= P/A (N/cm2)
0.018
Provin g ring readin g (div) 9
1.57x10-3
2.1
11.57
0.014
7
1.578x10-3
3.2
11.70
0.01
5
1.210x10-3
0
0
8.547x10-4
Specimen 2 S.N o
Elapsed time ‘t’ (minute s)
1.
0.50
2.
1.00
3.
1.50
4.
2.00
Strain dail reading ∆L (mm) 0.8 1.6 2.4
4.3 11.83 3.2 *this specimen is fail due to compaction* Specimen 3
Axial load P(N)
S.N o
Elapsed time ‘t’ (minute s)
1.
0.50
2.
1.00
3.
1.50
4.
2.00
5.
2.50
6.
3.00
7.
3.50
Strain dial reading ∆L (mm) 0.8 1.6 2.4 3.2 4.4 5.6 6.8
Axial strain, (ԑ) L/L0x100 (%) 1.1
Correcte d area Ac=A0/1ԑ) (cm3) 11.40
Axial load P(N)
Compressive stress, σ= P/Ac (N/cm2) x10-3
0.016
Provin g ring readin g (div) 8
2.1
11.57
0.02
10
1.728
3.2
11.70
0.028
14
2.390
4.3
11.83
0.038
19
3.212
5.9
12.00
0.054
27
4.500
7.5
12.19
0.064
32
5.250
9.1
12.37
0.064
32
5.174
CALCULATIONS Taking specimen 1, 0.50min as an example Axial strain, ε = (∆L/L0) x 100 (0.8/75) x 100 = 1.1 Corrected area, Ac = (ε+100)/100 x Ao = (1.1+100)/100 x 11.34 = 11.40cm 2 Axial load, P (N) = proving rings reading x 0.002N/Div 11 x 0.002 =0.022 Compressive strength, σ = P/Ac = 0.022/11.40 =1.929x10 -3N/cm3
1.404
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