| 초록 |
Bentonite composites have been used as a barrier to migrating liquids in civil engineering works over 30 years. For these clay liners, sodium bentonite-montmorillonite (reactive clay) is widely used, because it gives the excellent expand and sealant property at wet stage. In this study, we analyzed the swelling of sodium bentonites of powder and granular types in mono-valent cation solutions such as NaCl and KCl, bi-valent cation solutions such as MgCl2 and CaCl2, distilled water and also in HCl and NaOH solutions (with different pH values) under different temperatures such as room temperature (16°C), 30°C, 40°C, 50°C and 60°C. Finally, we examined the hydraulic properties of bentonite composites which were made of the addition of swelling agents. The hydraulic mechanism of bentonite composites was interpreted through the experimental data to be based on the difference of swelling agent addition behavior. |
