การประเมินความเหมาะสมของการใช้ดินท้องถิ่นจังหวัดสงขลาผสมเถ้าลอยไม้ยางพาราสำหรับชั้นกันซึมของบ่อฝังกลบมูลฝอย

Abstract

In this study, mixtures of Songkhla local clay and rubber wood ash were studied as a landfill liner. Benson and Daniel showed that suitable liner properties consist of a hydraulic conductivity lower than 1x10-7 cm/s, an unconfined compressive strength not less than 200 kPa and a volumetric shrinkage strain lower than 4%. In order to determine an appropriate mixture, the clayrubber wood ash ratios of 100:0 and 80:20 were used. For the mixture of 80:20, incubation times of 0, 7, and 28 days were employed. Experimental results show that for the 100:0 mixture (clay only) although its coefficient of hydraulic conductivity is lower than 1x10-7 cm/s but it is not suitable for use as a liner because its unconfined compressive strength and volumetric shrinkage strain are less than 200 kPa and more than 4%, respectively. On the other hand, for the 80:20 mixture with all incubation times, the test results meet the specified criteria. Hence, it is suitable for use as the landfill liner.