One-part geopolymer-like binders with calcium-based solid alkaline activators and metakaolin

IF 9.2 2区工程技术 Q1 ENERGY & FUELS

Sustainable Materials and Technologies Pub Date : 2025-07-08 DOI:10.1016/j.susmat.2025.e01528

Laura Bergamonti , Marianna Potenza , Elena Michelini , Daniele Ferretti , Silvia Borsacchi , Lucia Calucci , Laura Lazzarini , Pier Paolo Lottici , Francesco Talento , Claudia Graiff

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引用次数: 0

Abstract

The need to reduce greenhouse gas emissions has promoted the development of sustainable materials for the building industry to replace ordinary Portland cement (OPC).

This work focuses on the development of one-part geopolymer-like binders using calcium-based solid alkaline activators and metakaolin. The alkaline activator was prepared by mixing Ca(OH)₂ or CaO and Na-silicate or K-silicate, all in powders form.

XRD, FTIR, TGA/DTG and solid-state NMR analyses show the coexistence of both geopolymer gel and hydrated aluminosilicates. Microscopical investigations show that the morphology of the binders is heterogeneous with micrometric agglomerates. TEM reveals that the binders are characterized by agglomerates of nanoparticles, with abundant amorphous material and rare crystalline phases. The mechanical properties demonstrate the potential of this product as an eco-friendly alternative to OPC.

The use of powdered alkaline activators and the production process followed make the product suitable for the building industry to be used on construction sites.

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含钙基固体碱性活化剂和偏高岭土的单组分类地聚合物粘结剂

减少温室气体排放的需求推动了建筑行业可持续材料的发展，以取代普通波特兰水泥（OPC）。本文主要研究了利用钙基固体碱性活化剂和偏高岭土制备单组分类地聚合物粘结剂。将Ca(OH)2或CaO与na -硅酸盐或k -硅酸盐混合制成粉末状的碱性活化剂。XRD、FTIR、TGA/DTG和固态NMR分析表明，地聚合物凝胶和水合硅酸铝共存。微观研究表明，结合剂的形态是不均匀的，微观团聚。透射电镜结果表明，该粘结剂具有纳米颗粒团聚体的特征，具有丰富的非晶物质和罕见的晶相。机械性能证明了该产品作为OPC的环保替代品的潜力。粉末状碱性活化剂的使用及其生产工艺，使该产品适用于建筑行业的施工现场。

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

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.