Experimental study on preparation of fly ash-based geopolymer blended with recycled calcium source

IF 8.6 2区工程技术 Q1 ENERGY & FUELS Sustainable Materials and Technologies Pub Date : 2024-08-12 DOI:10.1016/j.susmat.2024.e01078

Deluan Feng, Dongyao Chen, Yang Yu, Shihua Liang

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Abstract

A large amount of waste eggshells raises environmental issues. This study uses eggshells as recycled calcium source to synthesize fly ash and eggshell geopolymer (FAEG). The effects of eggshell content, liquid-solid ratio, NaOH/Na₂SiO₃ ratio, and NaOH solution concentration on the strength of the FAEG were evaluated by unconfined compressive strength (UCS) test. The geopolymerization products and microstructure characteristics of the FAEG were analyzed by XRD, FTIR, TGA, and SEM test. The results show that eggshells acted as recycled calcium sources are capable of significantly enhancing the UCS of the FAEG. The optimal content of eggshells is 15%. The NaOH/Na₂SiO₃ ratio has a significant effect on the UCS of the FAEG, while the influence of liquid-solid ratio and NaOH concentration is slight. The optimal NaOH/Na₂SiO₃ ratio is 50:50 and the liquid-solid ratio is recommended to be 0.55. Eggshells take part in the geopolymerization by acting as a precipitating and seeding element in the reaction and favoring the generation of the geopolymeric gels in the FAEG.

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粉煤灰基土工聚合物与再生钙源混合制备实验研究

大量废弃蛋壳引发了环境问题。本研究利用蛋壳作为再生钙源，合成粉煤灰和蛋壳土工聚合物（FAEG）。通过无侧限抗压强度（UCS）测试评估了蛋壳含量、液固比、NaOH/Na2SiO3 比和 NaOH 溶液浓度对 FAEG 强度的影响。通过 XRD、FTIR、TGA 和 SEM 测试分析了 FAEG 的土聚合产物和微观结构特征。结果表明，蛋壳作为再生钙源能够显著提高 FAEG 的 UCS。蛋壳的最佳含量为 15%。NaOH/Na2SiO3 的比例对 FAEG 的 UCS 有显著影响，而液固比和 NaOH 浓度的影响较小。最佳的 NaOH/Na2SiO3 比例为 50:50，液固比建议为 0.55。蛋壳在土工聚合反应中起沉淀和播种作用，有利于在 FAEG 中生成土工聚合凝胶。

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来源期刊

Sustainable Materials and Technologies Energy-Renewable Energy, Sustainability and the Environment

CiteScore

13.40

自引率

4.20%

发文量

158

审稿时长

45 days

期刊介绍： Sustainable Materials and Technologies (SM&T), an international, cross-disciplinary, fully open access journal published by Elsevier, focuses on original full-length research articles and reviews. It covers applied or fundamental science of nano-, micro-, meso-, and macro-scale aspects of materials and technologies for sustainable development. SM&T gives special attention to contributions that bridge the knowledge gap between materials and system designs.