Enhancement in clinker hydration degrees and later stage-ettringite stability of calcium sulfoaluminate cements by the incorporation of dolomite

IF 10.8 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Cement & concrete composites Pub Date : 2024-10-23 DOI:10.1016/j.cemconcomp.2024.105815

Naru Kim , Joonho Seo , H.K. Lee

{"title":"Enhancement in clinker hydration degrees and later stage-ettringite stability of calcium sulfoaluminate cements by the incorporation of dolomite","authors":"Naru Kim , Joonho Seo , H.K. Lee","doi":"10.1016/j.cemconcomp.2024.105815","DOIUrl":null,"url":null,"abstract":"<div><div>The hydration degrees of clinkers and ettringite stability in calcium sulfoaluminate (C <span><math><mrow><mover><mi>S</mi><mo>‾</mo></mover></mrow></math></span> A) cements in the presence of externally supplied dolomite were investigated in this study. The mineralogical and microstructural characteristics of C <span><math><mrow><mover><mi>S</mi><mo>‾</mo></mover></mrow></math></span> A cements containing different dosages of dolomite were characterized using X-ray diffractometry, Rietveld refinement-based quantification analysis, thermogravimetry analysis, mercury intrusion porosimetry, scanning electron microscopy observation, and energy dispersive spectroscopy point analysis. Furthermore, the binder systems were simulated using thermodynamic modeling to observe the phase changes of hydration products and the underlying hydration kinetics. The incorporation of dolomite accelerated clinker consumption and enhanced the stability of ettringite throughout the testing period, due possibly to the nucleation seeding effect and provision of carbonate ions by dolomite. The modeling outcomes showed the stability of ettringite at later stage by the incorporation of dolomite in the simulated timeframe, yet the active dissolution of dolomite assumed in the modeling procedure overestimated the Mg-bearing hydrates in the samples.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"155 ","pages":"Article 105815"},"PeriodicalIF":10.8000,"publicationDate":"2024-10-23","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/S0958946524003883","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

The hydration degrees of clinkers and ettringite stability in calcium sulfoaluminate (C

\overline{S}

A) cements in the presence of externally supplied dolomite were investigated in this study. The mineralogical and microstructural characteristics of C

\overline{S}

A cements containing different dosages of dolomite were characterized using X-ray diffractometry, Rietveld refinement-based quantification analysis, thermogravimetry analysis, mercury intrusion porosimetry, scanning electron microscopy observation, and energy dispersive spectroscopy point analysis. Furthermore, the binder systems were simulated using thermodynamic modeling to observe the phase changes of hydration products and the underlying hydration kinetics. The incorporation of dolomite accelerated clinker consumption and enhanced the stability of ettringite throughout the testing period, due possibly to the nucleation seeding effect and provision of carbonate ions by dolomite. The modeling outcomes showed the stability of ettringite at later stage by the incorporation of dolomite in the simulated timeframe, yet the active dissolution of dolomite assumed in the modeling procedure overestimated the Mg-bearing hydrates in the samples.

查看原文本刊更多论文

通过掺入白云石提高硫铝酸钙水泥的熟料水化度和后期铁素体稳定性

本研究调查了在外部供应白云石的情况下，硫铝酸钙（C A）水泥中熟料的水化程度和蚀变石的稳定性。采用 X 射线衍射仪、基于 Rietveld 精炼的定量分析、热重分析、汞侵入孔隙度测定法、扫描电子显微镜观察和能量色散光谱点分析，对含有不同剂量白云石的 C A 水泥的矿物学和微观结构特征进行了表征。此外，还利用热力学模型模拟了粘合剂系统，以观察水合产物的相变和基本的水合动力学。在整个测试期间，白云石的加入加速了熟料的消耗，并增强了乙丁橡胶的稳定性，这可能是由于白云石的成核种子效应和碳酸根离子的提供。建模结果表明，在模拟时间范围内掺入白云石后，乙长石在后期具有稳定性，但建模过程中假设的白云石主动溶解高估了样品中的含镁水合物。

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 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.