| Summary: | 碩士 === 國立中央大學 === 土木工程學系 === 106 === This research aims at the derived fly ash and bottom ash which are produced by the domestic boiler plants burning biomass fuel, and clarify the properties of these waste and the feasibility of their reuses. According to the current status of the domestic boiler plant, two types of biomass fuels are selected: (1)palm kernel shells, (2) the wood pellets made of abandoned mushroom bags.
According to the characteristics of the materials, three different reuse methods are used in this study including (1) Controlled Low Strength Material, CLSM, (2) compressed concrete bricks, and (3) artificial aggregate. The result of reuse tests shows that utilization of the biomass fuel derived ash in civil engineering materials bring about certain effectiveness and economic benefits.
Because water absorption and loss on ignition of Mushroom bags fly ash (MFA) are high, when blending MFA in cement mortar will delay the setting time and decrease the strength. And excessive variability may affect the reuse of this kinds fly ash. In this study, using the re-treatment of washing MFA can improve the problem of setting time. The strength activity of palm kernel shells fly ash(PKSFA) are lower than the general coal fly ash due to the coarse particle size. Therefore, ground the PKSFA to increase the specific surface area, that would improve the strength activity of the blended cement mortar. That may since the agglomeration and crystallization of glassy phase of the particles occurred during the heating process.
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