Alkali activation of biomass fly ash-metakaolin blends
Alkali activation of biomass fly ash-metakaolin blends
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DOI：
10.1016/j.fuel.2012.04.006
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发表时间：
2012-08-01
期刊：
影响因子：
7.4
通讯作者：
Ferreira, Victor M.
中科院分区：
文献类型：
--
作者：
Rajamma, Rejini;Labrincha, Joao A.;Ferreira, Victor M.
本文研究了工业废弃物生物质粉煤灰和生物质粉煤灰-偏高岭土共混物的碱活化。使用生物质飞灰和可商购的偏高岭土ARGICAL 1200的混合物作为固体组分。不同摩尔体积的NaOH和硅酸钠溶液用于制备碱活化剂。在固化10天后测定机械强度。碱溶液的浓度和混合物的组成进行了优化，用于制备砂浆样品。采用X射线衍射（XRD）、热重/差热分析（TG/DTA）和扫描电子显微镜（SEM）等方法对碱激发粘结剂的矿物和微观结构进行了研究。生物质粉煤灰的砂浆样品给出了18 MPa的抗压强度。掺入偏高岭土的样品显示出更高的强度。对于40%偏高岭土掺入的砂浆，在约38 MPa下获得最高值。生物质粉煤灰偏高岭土共混物在碱活化应用中工作良好，导致铝硅酸盐和水合相形成的贡献。(C)2012爱思唯尔有限公司保留所有权利。
In this paper alkali activation of biomass fly ash - an industrial waste and biomass fly ash-metakaolin blends is investigated. Mixtures of biomass fly ash and commercially available metakaolin ARGICAL 1200 were used as solid components. Different molar volumes of NaOH and sodium silicate solutions were used for the preparation of alkali activators. The mechanical strength was determined after 10 days of curing. The concentration of alkali solution and the mix compositions were optimised for the preparation of mortar samples. The mineral and microstructural properties of the alkali activated binders were carried out by X-ray diffraction (XRD), Thermogravimetric/Differential thermal analysis (TG/DTA) and Scanning electron microscopy (SEM) methods. The mortar samples of biomass fly ashes gave a compressive strength of 18 MPa. The metakaolin incorporated samples showed a higher strength. The highest value was obtained for 40% metakaolin incorporated mortars for around 38 MPa. The biomass fly ash metakaolin blend is working well in the alkali activation application resulting in the contribution of both aluminosilicates and hydrated phases formation. (C) 2012 Elsevier Ltd. All rights reserved.