Assessment of waste eggshell powder as a limestone alternative in portland cement

IF 3.4 3区工程技术 Q2 CONSTRUCTION & BUILDING TECHNOLOGY

Materials and Structures Pub Date : 2024-11-06 DOI:10.1617/s11527-024-02478-9

Beng Wei Chong, Pratik Gujar, Xijun Shi, Prannoy Suraneni

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Abstract

The decarbonization of the concrete industry is an ongoing pursuit. One solution towards this goal is the use of limestone powder in portland cement. Waste eggshell has tremendous potential as an alternative calcite filler in cement due to its similarities with limestone. In this research, the feasibility of adding 15% and 35% ground eggshell in portland cement to make cement mortars was investigated. The hydration mechanism of eggshell and limestone blended cements was compared through the heat of hydration, phase assemblage, electrical resistivity, compressive strength, and shrinkage measurements. The experimental results showed that cement mortars with ground eggshell attained similar compressive strength as that with limestone. However, eggshell mixtures demand more mixing water to compensate the hydrophobicity of the eggshell membrane. The high calcite content in both eggshell and limestone accelerates the hydration of cement at 15% replacement, but ground eggshell retards cement hydration at 35% replacement due to the dominant influence of the membrane. Overall, eggshell waste is a feasible sustainable alternative to limestone powder at up to 15% portland cement replacement levels. Lifecycle assessment and cost analysis showed that adding 15% ground eggshell in cement concrete further reduces its embodied carbon and energy and cost compared to cement concrete containing limestone powder.

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将废弃蛋壳粉作为硅酸盐水泥中石灰石替代品的评估

混凝土行业的去碳化是一项持续的追求。实现这一目标的解决方案之一是在波特兰水泥中使用石灰石粉。由于废弃蛋壳与石灰石相似，因此作为水泥中方解石填料的替代品具有巨大潜力。本研究调查了在硅酸盐水泥中添加 15% 和 35% 的磨碎蛋壳来制作水泥砂浆的可行性。通过水化热、相组合、电阻率、抗压强度和收缩测量，比较了蛋壳水泥和石灰石混合水泥的水化机理。实验结果表明，掺有磨碎蛋壳的水泥砂浆与掺有石灰石的水泥砂浆具有相似的抗压强度。然而，蛋壳混合物需要更多的拌合水来补偿蛋壳膜的疏水性。蛋壳和石灰石中的方解石含量都很高，在掺量为 15%时会加速水泥的水化，但在掺量为 35%时，由于蛋壳膜的主要影响，磨碎的蛋壳会延缓水泥的水化。总体而言，在最高 15%的硅酸盐水泥替代水平下，蛋壳废料是石灰石粉的一种可行的可持续替代品。生命周期评估和成本分析表明，与含有石灰石粉的水泥混凝土相比，在水泥混凝土中添加 15%的磨碎蛋壳可进一步降低其体现碳、能源和成本。

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

Materials and Structures 工程技术-材料科学：综合

CiteScore

6.40

自引率

7.90%

发文量

222

审稿时长

5.9 months

期刊介绍： Materials and Structures, the flagship publication of the International Union of Laboratories and Experts in Construction Materials, Systems and Structures (RILEM), provides a unique international and interdisciplinary forum for new research findings on the performance of construction materials. A leader in cutting-edge research, the journal is dedicated to the publication of high quality papers examining the fundamental properties of building materials, their characterization and processing techniques, modeling, standardization of test methods, and the application of research results in building and civil engineering. Materials and Structures also publishes comprehensive reports prepared by the RILEM’s technical committees.