ผลกระทบของสารละลายโพแทสเซียมต่อคุณสมบัติการบวมตัวของดินบวมตัวในพื้นที่แม่เมาะ

Abstract

This paper presents the result of an experiment of using potassium solutions to reduce swell potential of expansive clay soil in Mae Moh District, Lampang Province, which has caused a lot of damages on buildings and road pavements in the area when moisture in the soil increased. Mae Moh expansive soil mineral was mainly montmorillonite mineral which is attractive to water in contrast to illite mineral of non-expansive soils. The only difference is illite has potassium ions bonding those sheets together while montmolillonite has no potassium ions present. This allows water to be attracted into the space between the sheets easily. Based on this fact, an assumption was set that if potassium ions were added in between the three-layer sheet of montmorillonite of the soils the swell potential could be reduced. In this experiment, Unrestrained swell test was used. samples of Mae Moh expansive soil were soaked in three types of potassium solutions: potassium chloride (KCl); potassium nitrate (KNO3); and potassium hydroxide (KOH), and then tested for the resultant swelling potential and X-Ray Diffraction analysis was performed using the Match! 3 program. The results showed that using 10% by weight KCl solution, 20% by weight KNO3 solution, and percent KOH solution. 20% by weight reduces percent swell of soils from 8.04% to 3.94%, 5.04% and 6.73% respectively.