Rheology and early-age structure development in binary and ternary blends modified with novel graphene types

IF 10.8 1区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY
Sahil Surehali , Collin Gustafson , Sayee Srikarah Volaity , Ranjith Divigalpitiya , Aditya Kumar , Narayanan Neithalath
{"title":"Rheology and early-age structure development in binary and ternary blends modified with novel graphene types","authors":"Sahil Surehali ,&nbsp;Collin Gustafson ,&nbsp;Sayee Srikarah Volaity ,&nbsp;Ranjith Divigalpitiya ,&nbsp;Aditya Kumar ,&nbsp;Narayanan Neithalath","doi":"10.1016/j.cemconcomp.2024.105869","DOIUrl":null,"url":null,"abstract":"<div><div>Interest in the use of graphene to enhance the properties of cementitious materials is growing, but major impediments in implementation are the cost of graphene and changes in binder rheology attributable to these nanomaterials. This study explores the influence of novel, cost-effective, environment-friendly, and mass-producible graphene on the rheology and early-age structure development of cementitious binders. Two novel graphene types—fractal graphene (FG) and reactive graphene (RG)—are used in plain cement mixtures as well as those containing 30 % (by mass) of fly ash and/or limestone powder, at low dosages of ≤0.02 % by mass of binder. The early- and later-age compressive strengths are higher (by ∼5–35 %) for the graphene-modified mixtures, and they more-than-compensate for early strength reduction induced by higher cement replacement levels. Yield stress, plastic viscosity, storage modulus, and short-term thixotropy are found to be significantly higher (up to 2 times or more for yield stress, plastic viscosity, and storage modulus, and up to 3 times for short-term thixotropy) for the FG- and RG-modified pastes, with a dominant enhancement noted for the RG-modified pastes. Time-dependent storage modulus evolution using small amplitude oscillatory shear tests, supplemented with associated models indicate faster structural buildup for the FG- and RG-modified pastes due to the contributions of FG and RG to inter-particle interactions and hydration. Storage modulus evolution beyond the onset of acceleration is found to be well-related to adjusted cumulative heat of hydration and electrical conductivity values, providing rapid and inexpensive means of reliably estimating early-age structure development in cementitious systems. It is determined that ultra-low dosages (≤0.02 % by mass of binder) of FG and RG can aid in tuning the rheological and structure-development parameters, which will be beneficial towards unique applications such as 3D concrete printing and ultra-high performance concretes.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"156 ","pages":"Article 105869"},"PeriodicalIF":10.8000,"publicationDate":"2024-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Cement & concrete composites","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0958946524004426","RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CONSTRUCTION & BUILDING TECHNOLOGY","Score":null,"Total":0}
引用次数: 0

Abstract

Interest in the use of graphene to enhance the properties of cementitious materials is growing, but major impediments in implementation are the cost of graphene and changes in binder rheology attributable to these nanomaterials. This study explores the influence of novel, cost-effective, environment-friendly, and mass-producible graphene on the rheology and early-age structure development of cementitious binders. Two novel graphene types—fractal graphene (FG) and reactive graphene (RG)—are used in plain cement mixtures as well as those containing 30 % (by mass) of fly ash and/or limestone powder, at low dosages of ≤0.02 % by mass of binder. The early- and later-age compressive strengths are higher (by ∼5–35 %) for the graphene-modified mixtures, and they more-than-compensate for early strength reduction induced by higher cement replacement levels. Yield stress, plastic viscosity, storage modulus, and short-term thixotropy are found to be significantly higher (up to 2 times or more for yield stress, plastic viscosity, and storage modulus, and up to 3 times for short-term thixotropy) for the FG- and RG-modified pastes, with a dominant enhancement noted for the RG-modified pastes. Time-dependent storage modulus evolution using small amplitude oscillatory shear tests, supplemented with associated models indicate faster structural buildup for the FG- and RG-modified pastes due to the contributions of FG and RG to inter-particle interactions and hydration. Storage modulus evolution beyond the onset of acceleration is found to be well-related to adjusted cumulative heat of hydration and electrical conductivity values, providing rapid and inexpensive means of reliably estimating early-age structure development in cementitious systems. It is determined that ultra-low dosages (≤0.02 % by mass of binder) of FG and RG can aid in tuning the rheological and structure-development parameters, which will be beneficial towards unique applications such as 3D concrete printing and ultra-high performance concretes.
用新型石墨烯改性的二元和三元共混物的流变性和早期结构发展
人们对使用石墨烯提高胶凝材料性能的兴趣与日俱增,但实施过程中的主要障碍是石墨烯的成本以及这些纳米材料导致的粘结剂流变学变化。本研究探讨了新型、经济、环保、可大规模生产的石墨烯对水泥基粘结剂流变性和早期结构发展的影响。两种新型石墨烯--分形石墨烯(FG)和活性石墨烯(RG)--被用于普通水泥混合物以及含有 30% 粉煤灰和/或石灰石粉(按质量计)的混合物中,掺量较低,按粘结剂质量计≤0.02%。石墨烯改性混合物的早期和晚期抗压强度都更高(提高了 5% 至 35%),它们足以弥补较高水泥替代量导致的早期强度降低。研究发现,FG 和 RG 改性浆料的屈服应力、塑性粘度、储存模量和短期触变性都显著提高(屈服应力、塑性粘度和储存模量提高 2 倍或以上,短期触变性提高 3 倍),其中 RG 改性浆料的提高幅度最大。利用小振幅振荡剪切试验和相关模型进行的随时间变化的存储模量演变表明,由于 FG 和 RG 对颗粒间相互作用和水合作用的贡献,FG 和 RG 改性浆料的结构建立速度更快。研究发现,加速度开始后的存储模量演变与调整后的累积水化热和电导率值密切相关,这为可靠地估计水泥基系统的早期结构发展提供了快速而廉价的方法。研究确定,超低剂量(按粘结剂质量计≤0.02%)的 FG 和 RG 有助于调整流变和结构发展参数,这将有利于三维混凝土打印和超高性能混凝土等独特应用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
求助全文
约1分钟内获得全文 求助全文
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.
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
确定
请完成安全验证×
copy
已复制链接
快去分享给好友吧!
我知道了
右上角分享
点击右上角分享
0
联系我们:info@booksci.cn Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术官方微信