Microstructure and physical properties of fly ash-based geopolymer with expanded vermiculite addition

IF 1.4 4区工程技术 Q3 CONSTRUCTION & BUILDING TECHNOLOGY

Advances in Cement Research Pub Date : 2023-07-12 DOI:10.1680/jadcr.23.00006

Yi Huang, Xiangdong Qing, Li Lin, Bicai Li, Lin Xu, Ying-lin Peng

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Abstract

Fly ash-based geopolymer paste with expanded vermiculite (EV) powder addition was synthesized and its microstructure, compressive strength, setting time, moisture control, efflorescence extent and thermal conductivity were studied. The results showed that EV addition resulted in the increase of standard consistency water consumption and setting time. As a consequence, its excessive addition caused a larger amount of harmful pores, which was detrimental for compressive strength of geopolymer paste. However, geopolymer pastes with an appropriate amount of EV addition (2-7 wt%) presented a slight increase of compressive strength because of the filler effect. Mg2+ and Fe2+diffused from EV interlayer through ions exchange between EV and geoploymer solution participated in geopolymerization. This was reflected by the formation of N-(M)-A-(F)-S-H evidenced through SEM-EDS and FITR analyis. In addition, Na2+/Mg2+or Na2+/Fe2+ ions exchange reduced the mobility of Na2+and therefore decreased the efflorescence extent. Moreover, EV addition favored the improvement of moisture control and thermal conductivity properties of geopolymer paste.

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掺有膨胀蛭石的粉煤灰基地聚合物的微观结构和物理性能

合成了添加膨胀蛭石粉体的粉煤灰基地质聚合物浆体，并对其微观结构、抗压强度、凝结时间、水分控制、风化程度和导热性能进行了研究。结果表明，EV的加入使标准稠度用水量和凝结时间增加。因此，其过量添加导致了大量的有害孔隙，不利于地质聚合物浆体的抗压强度。然而，由于填料效应，加入适量EV（2-7wt%）的地质聚合物浆体的抗压强度略有提高。Mg2+和Fe2+通过EV和地质合金溶液之间的离子交换从EV中间层扩散，参与了地质聚合。这反映在通过SEM-EDS和FITR分析证明的N-（M）-A-（F）-S-H的形成上。此外，Na2+/Mg2+或Na2+/Fe2+离子交换降低了Na2+的迁移率，从而降低了风化程度。此外，EV的加入有利于提高地质聚合物浆体的水分控制和导热性能。

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来源期刊

Advances in Cement Research 工程技术-材料科学：综合

CiteScore

3.70

自引率

5.00%

发文量

审稿时长

3.2 months

期刊介绍： Advances in Cement Research highlights the scientific ideas and innovations within the cutting-edge cement manufacture industry. It is a global journal with a scope encompassing cement manufacture and materials, properties and durability of cementitious materials and systems, hydration, interaction of cement with other materials, analysis and testing, special cements and applications.