| dc.description.abstract | In the Circulating fluidized bed (CFB) boiler combustion process, a lot of limestone was added for desulfurization and byproducts generated from CFB include fly ash and bed ash. In order for dust mitigation and easy moving, the ashes were soaked in water for 24 hrs to form Hydrated Circulating Fluidized Bed (HCFB) ash and was then placed on the sites for outdoor storage. This study aims at using HCFB ash as stabilizer for soft soil and as impervious lining materials for landfills.
In this study, different proportions of HCFB ash were mixed with an reservoir clay to explore the compaction characteristics, the California load ratio (CBR), and the permeability of the mixtures. In addition, the potential expansion behavior of the mixtures was studied too. The results show that adding HCFB ash to the reservoir clay can enhance the load bearing capacity, but with an increase in void ratio. However, in the expansion test, it was found that the mixtures exhibited higher swelling potential. This is because the large amounts of gypsum containing in HCFB ash is creating extra spaces around swelling particles of the reservoir clay, thus allowing the mixture to swell more. Finally, a degree of hydration test was conducted to further explore the swelling behavior of HCFB ash.
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