High-temperature stability of ambient-cured one-part alkali-activated materials incorporating graphene nanoplatelets for thermal energy storage

IF 6.2 2区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Developments in the Built Environment Pub Date : 2024-04-01 DOI:10.1016/j.dibe.2024.100447

Nghia P. Tran , Tuan N. Nguyen , Jay R. Black , Tuan D. Ngo

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Abstract

This study aims to develop an ambient-cured nano-engineered one-part alkali-activated materials with excellent thermal characteristics using graphene nanoplatelets (GNPs) and ternary precursors. Their compressive strength, thermal properties, microstructure, pore structure were characterised through visual observation, isothermal calorimetry, TGA, XRD, SEM/EDS and X-ray μCT after high temperature exposure to 200–800 °C. The research findings indicated high strength characteristics of the developed AAM (∼80 MPa) at ambient condition, which could further reach to approx. 100 MPa after being heated up to 400 °C. GNPs provided nucleation effects for promoting geopolymerisation and crystallisation. As observed from X-ray CT, a high extent of severe cracks initiated from the core and propagated towards the surface. From SEM/EDS analysis, high Na/Al and Na/Si ratios or low Si/Al and Ca/Si ratios highly correlated to thermal stability. Overall, the research outcomes implied the promising use of the nano-engineered AAMs for thermal energy storage (TES) at 400 °C.

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含有石墨烯纳米片的常温固化单组分碱活性材料的高温稳定性，用于热能储存

本研究旨在利用石墨烯纳米片（GNPs）和三元前驱体开发一种具有优异热特性的常温固化纳米工程单组分碱活性材料。通过目视观察、等温线量热法、TGA、XRD、SEM/EDS 和 X 射线 μCT 对高温暴露 200-800 °C 后的抗压强度、热性能、微观结构和孔隙结构进行了表征。研究结果表明，所开发的 AAM 在环境条件下具有较高的强度特性（∼80 兆帕），在加热至 400 °C 后，强度可进一步达到约 100 兆帕。GNP 具有成核效应，可促进土工聚合和结晶。根据 X 射线 CT 观察，大量严重裂纹从核心开始并向表面扩展。根据 SEM/EDS 分析，高 Na/Al 和 Na/Si 比率或低 Si/Al 和 Ca/Si 比率与热稳定性高度相关。总之，研究结果表明，纳米工程 AAMs 在 400 °C 的热能存储 (TES) 中的应用前景广阔。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Developments in the Built Environment Multiple-

CiteScore

7.40

自引率

1.20%

发文量

审稿时长

22 days

期刊介绍： Developments in the Built Environment (DIBE) is a recently established peer-reviewed gold open access journal, ensuring that all accepted articles are permanently and freely accessible. Focused on civil engineering and the built environment, DIBE publishes original papers and short communications. Encompassing topics such as construction materials and building sustainability, the journal adopts a holistic approach with the aim of benefiting the community.