Porous alkali activated materials with slow alkali release dynamic. Role of composition

IF 1.1 4区 工程技术 Q3 CONSTRUCTION & BUILDING TECHNOLOGY
G. Bumanis, D. Bajare
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引用次数: 4

Abstract

Alkali activated materials (AAM) based on calcined metakaolin or illite clay together with waste by-products, such as waste glass or aluminium scrap recycling waste, were tested as value-added materials for pH stabilization in biogas technology where decrease of pH should be avoided. Porous materials with ability to slowly leach alkalis in the water media thus providing continuous control of the pH level were obtained. XRD, FTIR, SEM and titration methods were used to characterize AAM and their leaching properties. It is clear that composition of the material has an important effect on the diffusion of alkali from structure. Namely, higher Si/Al and Na/Al molar ratios may increase pore solution transfer to the leachate. The leaching rate of alkalis from the structure of AAM is high for the first few days, decreasing over time. It was possible to calculate the buffer capacity from the mixture design of AAM.
多孔碱活性材料具有缓碱释放动态。作文的作用
以煅烧偏高岭土或伊利石粘土为基础的碱活性材料(AAM)与废副产品(如废玻璃或铝废料回收废物)一起,作为沼气技术中pH稳定的增值材料进行了测试,应避免pH降低。获得了具有在水介质中缓慢浸出碱的能力的多孔材料,从而提供对pH水平的连续控制。采用XRD、FTIR、SEM和滴定等方法对AAM及其浸出性能进行了表征。很明显,材料的组成对碱从结构中的扩散有重要影响。即,较高的Si/Al和Na/Al摩尔比可以增加孔隙溶液向渗滤液的转移。AAM结构中碱的浸出率在最初几天很高,并随着时间的推移而降低。从AAM的混合物设计中可以计算缓冲容量。
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来源期刊
Materiales de Construccion
Materiales de Construccion 工程技术-材料科学:综合
CiteScore
3.20
自引率
9.50%
发文量
38
审稿时长
>12 weeks
期刊介绍: Materiales de Construcción is a quarterly, scientific Journal published in English, intended for researchers, plant technicians and other professionals engaged in the area of Construction, Materials Science and Technology. Scientific articles focus mainly on: - Physics and chemistry of the formation of cement and other binders. - Cement and concrete. Components (aggregate, admixtures, additions and similar). Behaviour and properties. - Durability and corrosion of other construction materials. - Restoration and conservation of the materials in heritage monuments. - Weathering and the deterioration of construction materials. - Use of industrial waste and by-products in construction. - Manufacture and properties of other construction materials, such as: gypsum/plaster, lime%2
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