Influence of core-shell nanospheres on the carbonation development of cement mortars and its mechanism: synergistic effect of hydration and early CO2 uptake

IF 13.1 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Cement & concrete composites Pub Date : 2025-09-01 DOI:10.1016/j.cemconcomp.2025.106310

Jiankun Xu , Zhengxian Yang , Zelong Zheng , Demetris Nicolaides , Yong Zhang , Giuseppe Carlo Marano , Bruno Briseghella

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Abstract

Evaluating and quantifying the impact of the introduction of nanomaterials on microscopic properties is crucial to ensure the carbonation resistance of nano-modified cementitious materials. In this paper, Titanium dioxide @Layered Double Hydroxide (TiO₂@LDH) nanospheres with core-shell structure were synthesized by two-step method and showed notable dispersion and stability in cementitious matrix. The effect of TiO₂@LDH on cement hydration, carbonation behavior, microstructure and mechanical properties of mortar were investigated. The results show that under the effect of nucleation and refinement, the hydration degree of mortar containing TiO₂@LDH increases by 19.6 % and the total porosity decreases by 12.5 %, and the compressive strength increased by about 27.01 %. By adjusting the growth rate and particle size of CH crystals, the CO₂ absorption capacity of mortar increased by 28 %. The synergistic mechanism of TiO₂@LDH promoting hydration and early CO₂ uptake to improve the carbonation resistance of mortar was proposed. More importantly, based on the reduction of mortar porosity and the formation of early physical barriers, the carbonation resistance and gas permeability of mortar were reduced by 53.7 % and 79.7 %, respectively. This novel nano-control technology provides a promising alternative for the application and development of carbon sequestration in cementitious materials.

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核壳纳米球对水泥砂浆碳化发展的影响及其机理：水化与早期CO2吸收的协同效应

评价和量化纳米材料的引入对微观性能的影响是保证纳米改性胶凝材料抗碳化性能的关键。本文采用两步法合成了具有核壳结构的二氧化钛@层状双氢氧化钛（TiO2@LDH）纳米球，该纳米球在胶凝基质中具有良好的分散性和稳定性。研究了TiO2@LDH对水泥水化、碳化性能、砂浆微观结构和力学性能的影响。结果表明：在成核和细化作用下，掺TiO2@LDH砂浆的水化程度提高了19.6%，总孔隙率降低了12.5%，抗压强度提高了约27.01%；通过调节CH晶体的生长速率和粒径，砂浆的CO2吸收量可提高28%。提出了TiO2@LDH促进水化和早期CO2吸收提高砂浆抗碳化性能的协同机理。更重要的是，基于砂浆孔隙率的降低和早期物理屏障的形成，砂浆的抗碳化性能和透气性分别降低了53.7%和79.7%。这种新型的纳米控制技术为固碳在胶凝材料中的应用和发展提供了一种有前景的选择。

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

Cement & concrete composites 工程技术-材料科学：复合

CiteScore

18.70

自引率

11.40%

发文量

459

审稿时长

65 days

期刊介绍： Cement & concrete composites focuses on advancements in cement-concrete composite technology and the production, use, and performance of cement-based construction materials. It covers a wide range of materials, including fiber-reinforced composites, polymer composites, ferrocement, and those incorporating special aggregates or waste materials. Major themes include microstructure, material properties, testing, durability, mechanics, modeling, design, fabrication, and practical applications. The journal welcomes papers on structural behavior, field studies, repair and maintenance, serviceability, and sustainability. It aims to enhance understanding, provide a platform for unconventional materials, promote low-cost energy-saving materials, and bridge the gap between materials science, engineering, and construction. Special issues on emerging topics are also published to encourage collaboration between materials scientists, engineers, designers, and fabricators.