Open AccessCrack formation behavior of composite fly ash – bentonite (FAB) in landfill liner system
Author(s) -
Syafrudin Syafrudin,
Mochamad Arief Budihardjo,
Endro Sutrisno,
Wisnu Setya Nugraha,
Ganjar Samudro
Publication year - 2021
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/894/1/012027
Subject(s) - fly ash , bentonite , desiccation , composite number , materials science , environmental science , cracking , permeability (electromagnetism) , hydraulic conductivity , waste management , geotechnical engineering , composite material , geology , chemistry , soil science , engineering , soil water , botany , biochemistry , membrane , biology
This study aims to investigate the influence of different mixtures on the phenomenon of desiccation cracking in bentonite-fly ash mixtures as a landfill liner system. Fly ash is quite potential to be used as a landfill liner mixture because it has a low hydraulic permeability or conductivity value. This study uses class F fly ash from the Paiton power plant production process, Indonesia, which has been distributed commercially. Desiccation test was conducted in this study. The composition of fly ash and bentonite which is used are pure fly ash (FAB0), fly ash and bentonite 15% (FAB15), fly ash and bentonite 20% (FAB20) and fly ash and bentonite 25% (FAB25). The smallest CIF value is found in the pure fly ash layer. However, the pure fly ash cannot be used as landfill liner because the high permeability value. Therefore, the addition of bentonite will increase the possibility of crack formation. This study reveals that the addition bentonite in the fly ash composite will increase the crack. However, determining appropriate mixture composition is critical when working on the landfill liner system.