What is the mechanism of carbonation in lime-stabilized soil?
It is evident that the conversion of Ca (OH) 2 into CaCO 3 is the main mechanism that controls the carbonation behavior in lime-stabilized expansive soils. This mechanism implies that the consumption of Ca (OH) 2 destroys the alkaline condition and reduces the pH value, which is similar to the results of Figure 9.
Why do soil carbonates appear?
Soil carbonates appear, at the sites which were studied, to form in equilibrium with modern meteoric waters and to be useful indicators of the general temperature regime of the site.
How does carbonation depth change with time in expansive soil?
XRD, MIP, and SEM techniques were adopted as supplements to reveal the carbonation mechanism. Results demonstrated that the carbonation depth of lime-stabilized expansive soil increased significantly as time elapsed; however, the rate of increase reduced when the carbonation time increased.