By soil-cement specimens 28 days age unconfined compression test to
obtain the stress-strain curve is shown in Fig. 4. Fig. 4 shows that the stress-strain relationship is
nonlinear relation. In the loading stage begins, stress-strain is approximately linear relationship,
behaving as elastic material properties. When the stress reaches a certain value, the stress-strain curve
begins to bend, showing plastic material properties. Soil-cement failure under pressure, The axial
strain is commonly 0.8%-1.2%.