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Leaching characteristics of biomass ash-based binder in neutral and acidic media
Published in Elsevier Ltd
2019
Volume: 100
   
Pages: 92 - 98
Abstract
Biomass ash results from the combustion of agricultural residues, which, in many developing countries, are a primary source of power generation for small and medium size industries. This study focuses on the performance of a binder synthesized from an Indian biomass ash, Indo-Gangetic clay, hydrated lime, and aqueous 1M NaOH solution. To measure the extent of leaching and its impact on physicochemical properties, the biomass ash binder in powder form (<45 μm size) was exposed to two different leaching media: deionized water and 0.1M HNO 3 at two different solution-to-sample ratios (by wt.) of 10 and 100. Sodium leaching was found to be prominent in the biomass ash binder irrespective of leaching medium and solution-to-sample ratio. However, calcium leaching was significantly higher in 0.1M HNO 3 than in deionized water. Calcium silicate hydrate present in the biomass ash binder was found to be less chemically stable in 0.1M HNO 3 , exhibiting complete calcium leaching at a solution-to-sample ratio of 100. Furthermore, significant leaching of calcium in 0.1M HNO 3 solution resulted in phase modification of calcium silicate hydrate, the main reaction product of the biomass ash binder. © 2019 Elsevier Ltd
About the journal
JournalData powered by TypesetCement and Concrete Composites
PublisherData powered by TypesetElsevier Ltd
ISSN09589465
Open AccessNo
Concepts (23)
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    Agricultural wastes
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    Binders
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    Biomass
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    Clay
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    Deionized water
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    Developing countries
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    Hydrated lime
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    Hydrates
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    Hydration
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    Leaching
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    Lime
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    Physicochemical properties
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    Silicate minerals
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    Sodium hydroxide
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    Alkali activation
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    BIOMASS ASHES
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    CALCIUM LEACHING
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    Calcium silicate hydrate
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    LEACHING CHARACTERISTICS
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    LEACHING MEDIUMS
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    Nitrogen sorption
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    POZZOLANICITY
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    Calcium silicate