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SCHOOL OF GRADUATE STUDIES FACULTY OF TECHNOLOGY ...

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Results of the Control Samples<br />

Table 15 : Comparison of Measured value with Calculated Value for Control Samples<br />

Location<br />

Measured Value<br />

Swelling<br />

Pressure(Kpa)<br />

Predicted Value<br />

Eqn. 1 Eqn. 2 Eqn. 3 Eqn. 4 Eqn. 5 Eqn. 6 Eqn. 7<br />

Kereza Mender 79.95 70.90 54.06 49.13 60.51 60.72 61.59 54.44<br />

Kebele 10 92.12 164.14 176.95 181.40 183.35 226.30 194.10 202.41<br />

Kebele 15 128.09 166.26 169.22 157.04 165.26 195.15 193.46 179.80<br />

6.4 Graphical Representation of the Measured and Calculated Values<br />

The following graphs are plotted to investigate the approximation accuracy of the newly<br />

developed formulas. The measured and calculated values are plotted ( Fig.14 to Fig. 20)<br />

trend lines are drawn to observe the gap between the measured and the calculated values.<br />

Equation 1<br />

700<br />

Calculated Value (Kpa)<br />

600<br />

500<br />

400<br />

300<br />

200<br />

y = 0.8184x + 39.661<br />

R 2 = 0.8028 , n =24<br />

100<br />

0<br />

0 100 200 300 400 500 600<br />

Measured Value (Kpa)<br />

Fig. 14 Plot of Equation 1 V S Measured Value<br />

50

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