Mechanical and shrinkage properties of cellulose nanocrystal modified alkali-activated fly ash/slag pastes

IF 10.8 1区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY Cement & concrete composites Pub Date : 2024-09-14 DOI:10.1016/j.cemconcomp.2024.105753
Hu Feng , Istehsan Bilal , Zhihui Sun , Aofei Guo , Zhenyun Yu , Yunxing Du , Yifan Su , Yuelong Zheng
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Abstract

Alkali-activated materials based on fly ash (FA) and ground granulated blast furnace slag (GGBFS) offer lower carbon footprints but face challenges like low tensile strength and shrinkage susceptibility. This research explores the potential of cellulose nanocrystals (CNC) as additives to enhance the mechanical and shrinkage properties of alkali-activated fly ash/slag (AAFS) pastes to advance sustainable construction materials. A comprehensive examination is conducted on the impact of different contents of CNC (0.05 %, 0.1 %, 0.2 %, and 0.3 % by mass of FA + GGBFS) on the properties of AAFS pastes with two different alkaline activator contents (4 % and 8 % by mass of FA + GGBFS). It is found that incorporating 0.3 % CNC into AAFS pastes respectively improves the 28-day compressive and flexural strengths by 18.54 % and 60.87 % (8 % alkaline activator) and by 16.99 % and 50.12 % (4 % alkaline activator), and reduces the autogenous shrinkage and drying shrinkage by 26.42 % and 50.32 % (8 % alkaline activator) and by 11.74 % and 22.05 % (4 % alkaline activator). Also, the flexural/compressive strength ratio of AAFS pastes is increased with increasing CNC content. The microstructural analysis shows increased hydration product formation and a smoother, more compact morphology in CNC-modified samples, which together with water retention and distribution effect and nano-reinforcing effect of CNC explains the improvements in mechanical properties and volume stability. The research findings highlight the great potential of CNC as a reinforcing agent for sustainable construction materials, aligning with the demand from industries for eco-friendly alternatives to traditional cementitious materials.
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纤维素纳米晶改性碱激活粉煤灰/炉渣浆料的机械和收缩性能
基于粉煤灰(FA)和磨细高炉矿渣(GGBFS)的碱活性材料具有较低的碳足迹,但也面临着拉伸强度低、易收缩等挑战。本研究探讨了纤维素纳米晶体(CNC)作为添加剂提高碱激活粉煤灰/炉渣浆料(AAFS)机械和收缩性能的潜力,以推动可持续建筑材料的发展。本研究全面考察了不同含量的 CNC(按 FA + GGBFS 重量计分别为 0.05 %、0.1 %、0.2 % 和 0.3 %)对两种不同碱性活化剂含量(按 FA + GGBFS 重量计分别为 4 % 和 8 %)的 AAFS 浆料性能的影响。研究发现,在 AAFS 浆料中加入 0.3 % CNC 可分别提高 28 天抗压强度和抗折强度 18.54 % 和 60.87 %(8 % 碱性活化剂)以及 16.99 % 和 50.12 %(4 % 碱性活化剂),并降低自生收缩率和干燥收缩率 26.42 % 和 50.32 %(8 % 碱性活化剂)以及 11.74 % 和 22.05 %(4 % 碱性活化剂)。此外,随着 CNC 含量的增加,AAFS 浆料的抗折/抗压强度比也有所提高。微观结构分析表明,CNC 改性样品中水合产物的形成增加,形态更平滑、更紧凑,CNC 的保水和分布效应以及纳米增强效应共同解释了机械性能和体积稳定性的改善。研究结果凸显了 CNC 作为可持续建筑材料增强剂的巨大潜力,符合各行业对传统水泥基材料生态友好型替代品的需求。
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来源期刊
Cement & concrete composites
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.
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