Cement and Concrete Research最新文献

英文中文

In-situ observations of tricalcium silicate formation in modified electric arc furnace slag under different temperature regimes 不同温度下改性电弧炉炉渣中硅酸三钙形成的原位观察

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

Cement and Concrete Research

Pub Date : 2025-09-04 DOI: 10.1016/j.cemconres.2025.108035

Mingrui Yang, Zhiming Yan, Zushu Li

Electric Arc Furnace (EAF) steelmaking slag is a significant byproduct generated during EAF steelmaking and utilizing EAF slag for cement clinker production potentially offers both economic and environmental benefits. The formation of tricalcium silicate (C₃S - 3CaO∙SiO₂) in EAF slag, the principal hydration phase in Portland cement clinker, plays a critical role in enabling the utilization of EAF slag for cement production. In this study, we conducted in-situ observations of C₃S formation and slag crystallization in modified EAF slags under varying temperature regimes. The results indicated that rapid cooling from 1600 °C to room temperature at a cooling rate of -1500 K/min °C led to the formation of a layered structure consisting of dicalcium silicate (C₂S) and a calcium ferrite (CF) based slag. The process of C₃S crystal growth was observed under both isothermal and non-isothermal conditions. Under isothermal condition with low degree of undercooling, the C₃S crystals predominantly formed equiaxed shapes, whereas higher undercooling levels promoted the development of dendrites C₃S. The growth of C₃S crystals is accompanied by the transformation of C₂S via the reaction: C₂S (s) + CaO (l) → C₃S (s). Extending the holding time at 1600 °C enhanced C₃S nucleation, resulting in a higher C₃S content in the slag.

电弧炉炼钢渣是电弧炉炼钢过程中产生的重要副产物，利用电弧炉炉渣生产水泥熟料具有潜在的经济效益和环境效益。作为硅酸盐水泥熟料的主要水化相，电炉炉渣中硅酸三钙（C3S - 3CaO∙SiO2）的形成对电炉炉渣用于水泥生产起着至关重要的作用。在这项研究中，我们对不同温度下改性电炉渣的C3S形成和渣结晶进行了现场观察。结果表明，在-1500 K/min℃的冷却速率下，从1600℃快速冷却至室温，形成由硅酸二钙（C2S）和铁酸钙（CF）基渣组成的层状结构。在等温和非等温条件下观察了C3S晶体的生长过程。在低过冷度的等温条件下，C3S晶体主要形成等轴形状，而较高的过冷度促进了枝晶C3S的发展。C3S晶体的生长伴随着C2S的转化反应：C2S (s) + CaO (l)→C3S (s)。1600℃保温时间延长，有利于C3S成核，导致渣中C3S含量升高。

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引用次数: 0

Conversion of hazardous waste into calcium sulfoaluminate cement: effect of alkalinity modulus on mineral composition and Fe2O3 incorporation in Ye'elimite 危废转化为硫铝酸钙水泥：碱度模量对叶铝石矿物组成及Fe2O3掺入量的影响

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

Cement and Concrete Research

Pub Date : 2025-09-03 DOI: 10.1016/j.cemconres.2025.108028

Di Yu , Jie Li , Mengxia Xu , Jun He , Bo Li , Yin Wang

The production of calcium sulfoaluminate (CSA) cement using hazardous wastes can enhance its sustainability and economic benefits. Incorporating Fe₂O₃ into ye'elimite can reduce the Al₂O₃ demand in waste-based CSA cement, while the influence of alkalinity modulus (Cm) on this incorporation remains unclear. This study synthesised CSA cement clinker from hazardous wastes with varying Cm. Results show that forming inert phases like C₂AS and Fe₂SiO₄ hinders the synthesis of hydraulically active minerals, requiring a higher Cm of 1.10 to attain the highest 28-day compressive strength of 76.4 MPa. Additionally, increasing Cm reduces the Fe/(Al + Fe) ratio in ye'elimite, particularly in low-aluminium clinkers. This contributes to the transformation of C₄A₃

\bar{S}

-o to C₄A₃

\bar{S}

-c and the slowed hydration. However, facilitated ye'elimite formation under higher Cm and increased Al₂O₃ content in feedstock leads to more Fe₂O₃ being incorporated into ye'elimite. This study provides guidance on regulating Fe₂O₃ incorporation in the production of waste-based CSA cement clinker.

利用危险废物生产硫铝酸钙水泥可以提高其可持续性和经济效益。在废基CSA水泥中掺入Fe2O3可以减少Al2O3的用量，但碱度模数（Cm）对掺入量的影响尚不清楚。本研究以不同Cm的危险废弃物为原料合成CSA水泥熟料。结果表明：C2AS、Fe2SiO4等惰性相的形成阻碍了水力活性矿物的合成，需要较高的Cm（1.10）才能达到最高的28天抗压强度76.4 MPa；此外，增加Cm可降低铝铝熟料中的Fe/(Al + Fe)比，特别是在低铝熟料中。这导致C4A3S¯S¯-o向C4A3S¯S¯-c的转变，水化速度减慢。然而，在较高的Cm条件下，有利于极限值的形成和原料中Al2O3含量的增加导致更多的Fe2O3被掺入极限值中。该研究对控制废基CSA水泥熟料中Fe2O3掺入量具有指导意义。

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引用次数: 0

Fracture in concrete: X-ray tomography with in-situ testing, digital volume correlation and phase-field modeling 混凝土断裂：x射线断层成像与原位测试，数字体积相关和相场建模

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

Cement and Concrete Research

Pub Date : 2025-09-03 DOI: 10.1016/j.cemconres.2025.108012

A. Mishra , P. Carrara , M. Griffa , L. De Lorenzis

We test and simulate the mesoscopic cracking behavior of specimens made of a standard concrete mixture. To this end, we combine stable wedge-splitting fracture experiments performed during X-ray tomography, their analysis with digital volume correlation providing the full three-dimensional displacement field, and phase-field cohesive fracture modeling. In our computations, we apply the measured boundary conditions and model the actual heterogeneous material structure at the mesoscopic scale. Within the phase-field model, we explicitly distinguish among (thus individually represent) the mesostructural features of distinct material phases with size above a threshold of 1 mm, while we homogenize pores and finer aggregates below this threshold within the cementitious mortar matrix, with material parameters characterized accordingly. We compare experimental and numerical results in terms of both local and global quantities.

我们测试和模拟了由标准混凝土混合料制成的试件的细观开裂行为。为此，研究人员将x射线断层扫描期间进行的稳定楔形劈裂裂缝实验、提供完整三维位移场的数字体积相关分析和相场内聚裂缝建模结合起来。在我们的计算中，我们应用测量的边界条件，并在介观尺度上模拟实际的非均质材料结构。在相场模型中，我们明确区分（从而单独代表）尺寸大于1毫米阈值的不同材料相的细观结构特征，同时我们在胶凝砂浆基质中均匀化孔隙和小于该阈值的细集料，并相应地表征材料参数。我们比较了实验和数值结果在局部和全局量。

引用次数: 0

A transfer learning-driven paradigm for understanding cryogenic freezing mechanisms in low water/binder cement-based composites 低水/粘合剂水泥基复合材料低温冻结机制的迁移学习驱动范式

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

Cement and Concrete Research

Pub Date : 2025-08-29 DOI: 10.1016/j.cemconres.2025.108027

Yuan Feng , Lingyan Zhang , Dingqiang Fan , Kangning Liu , Rui Yu

Data scarcity and dispersion constrain the accurate assessment of cryogenic concrete performance and impede the investigation of its microstructural evolution. This study first developed a physics-informed transfer learning framework to predict low water/binder cement-based composites (LWCC) behavior across a wide temperature range and reveal coupled macro–micro freezing mechanisms. The results demonstrated that transfer learning, by integrating hydration and freezing features, effectively overcame data scarcity and enabled accurate prediction of LWCC low-temperature performance (R² > 0.90). The model exhibited self-adaptive capability, extending its applicable temperature range to be extended from the training range of 0 to −80°C down to −196°C. Based on the data-driven model, a freezing model was proposed, identifying strength gain, damage–densification balance, secondary strengthening, and interfacial debonding stages, with transitions influenced by w/b ratio and solid skeleton structure. This work achieves AI-driven precise prediction of cryogenic concrete, offering insights into material design and freezing mechanisms under extreme conditions.

数据的稀缺性和分散性制约了低温混凝土性能的准确评价，阻碍了低温混凝土微观结构演变的研究。该研究首先开发了一个基于物理的迁移学习框架，用于预测低水/粘合剂水泥基复合材料（LWCC）在宽温度范围内的行为，并揭示了耦合的宏观-微观冻结机制。结果表明，迁移学习通过整合水化和冻结特征，有效克服了数据稀缺性，能够准确预测LWCC低温性能（R2 > 0.90）。该模型具有自适应能力，可将其适用温度范围从0 ~ - 80℃的训练范围扩展到- 196℃。在数据驱动模型的基础上，提出了冻结模型，确定了强度增加、损伤-致密平衡、二次强化和界面脱粘阶段，过渡阶段受w/b比和实体骨架结构的影响。这项工作实现了人工智能驱动的低温混凝土的精确预测，为极端条件下的材料设计和冻结机制提供了见解。

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引用次数: 0

Aluminum incorporation lowers the intrinsic mechanical properties of single-chain calcium silicate hydrate 掺入铝降低了单链水合硅酸钙的内在力学性能

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

Cement and Concrete Research

Pub Date : 2025-08-27 DOI: 10.1016/j.cemconres.2025.108026

Jiawei Wang , Ruoxi Yang , Paula Sanz-Camacho , Mathieu Duttine , Thomas Huthwelker , Jiaqi Li

In blended cement systems, the principal hydration product is calcium (alumino) silicate hydrate (C-(A-)S-H). The investigation into how aluminum incorporation affects its mechanical properties is essential for optimizing the formulation and properties of cementitious materials. This study employs high-pressure X-ray diffraction to explore the intrinsic mechanical properties of nanocrystalline single-chain C-A-S-H (Ca-to-Si ratio 1.6), resembling chemical compositions of C-A-S-H in blended cement systems. Increasing aluminum incorporation softens all unit cell axes, with basal planar incompressibility governed by the aluminum coordination number, showing an increasing order of Al(IV) < Al(VI) < Al(V). The softening of the basal plane arises from the longer AlO bond length relative to SiO bond, and the different distortion indexes in AlO_x polyhedra. The hydrogen bond numbers and angles relative to the basal plane within per unit cell influence the basal planar incompressibility of single-chain C-A-S-H. Aluminum-uptake-induced expansion in basal space contributes to a softened c-axis.

在混合水泥体系中，主要水化产物是水合硅酸钙（铝）（C-(A-)S-H）。研究铝掺入量对胶凝材料力学性能的影响，对优化胶凝材料的配方和性能具有重要意义。本研究采用高压x射线衍射研究了纳米晶单链C-A-S-H （ca - si比1.6）的内在力学性能，类似于混合水泥体系中C-A-S-H的化学成分。随着铝掺入量的增加，各单元胞轴均软化，基底平面不可压缩性受铝配位数的支配，表现为Al(IV) < Al(VI) < Al(V)。基面软化的原因是相对于SiO键，AlOx的键长较长，以及AlOx多面体的畸变指数不同。单链C-A-S-H的基面不可压缩性受单链C-A-S-H的氢键数和相对于基面角度的影响。基底空间的铝吸收引起的膨胀有助于软化c轴。

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引用次数: 0

Impact of calcination time on metakaolin morphology and enhancement of pozzolanic reactivity: Insights from in situ TEM 煅烧时间对偏高岭土形态和火山灰反应性增强的影响：来自原位透射电镜的见解

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

Cement and Concrete Research

Pub Date : 2025-08-25 DOI: 10.1016/j.cemconres.2025.108022

Tausif E Elahi , Pablo Romero , Nishant Garg

Metakaolin reactivity is a function of both the calcination temperature and time. While significant literature exists on temperature-induced changes, studies on the time parameter are limited. Especially, what happens at the particle scale during calcination is unknown. Here, we shed light on this issue by observing kaolin particles on a live heated stage via in situ TEM. We find that individual kaolin particles undergo a layer thinning of ~15 nm as well as an area reduction of 2–5 %. R³ tests reveal an enhancement in reactivity as a function of calcination time (10 to 40 min of calcination leads to an increase of 850 to 950 J/g in 7d cumulative heat). These two phenomena - the morphological changes and the reactivity test results follow a similar exponential trend, which saturates at ~40 min. These results suggest that prolonged calcination times impact particle morphology, which has a strong correlation with clay reactivity.

偏高岭土的反应性是煅烧温度和时间的函数。虽然有大量关于温度引起的变化的文献，但对时间参数的研究却很有限。特别是，在煅烧过程中，颗粒尺度上发生的情况是未知的。在这里，我们通过原位透射电镜在现场加热阶段观察高岭土颗粒来阐明这个问题。我们发现单个高岭土颗粒经历了~15 nm的层变薄，面积减少了2 - 5%。R3测试表明，反应性随煅烧时间的增加而增强（煅烧10至40分钟导致7d累积热量增加850至950 J/g）。这两种现象-形态变化和反应性测试结果遵循相似的指数趋势，在~40 min达到饱和。结果表明，煅烧时间延长会影响颗粒形态，而颗粒形态与粘土的反应性密切相关。

引用次数: 0

Effect of alumina on the carbonation reactivity of calcium aluminosilicate glasses 氧化铝对钙铝硅酸盐玻璃碳酸化反应性的影响

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

Cement and Concrete Research

Pub Date : 2025-08-22 DOI: 10.1016/j.cemconres.2025.108023

Chen Li , Qiaomu Zheng , Bo Liu , Jiaqi Li , Weihao Zhu , Yuan Fang , Kaiming Peng , Zuhua Zhang , Zhengwu Jiang

Reactivity of silicate glasses, the main component of industrial byproducts such as blast furnace slag and yellow phosphorus slag, is highly linked with their chemical and nano-structural properties. To provide insights on the viability of such materials for use in CO₂ mineralization, this study highlights the role of Al₂O₃ in the carbonation of synthetic CaO·Al₂O₃·SiO₂ glasses. The incorporation of Al₂O₃ impedes the carbonation reaction by modifying the glass structure at multiple length scales. At the atomic scale, the formation of [AlO₄]⁻ removes the non-bridging oxygens which serve as sites for Ca²⁺/H⁺ exchange, and disrupts the Ca²⁺ channels by clustering with [SiO₄] in the Q⁴ state. At the nanoscale, phase-separated regions were observed particularly in high-Al glasses. During carbonation (when pH = 6), the Al species re-adsorbed on the surface of glass particles preferentially to Ca²⁺. This effect hinders the heterogeneous nucleation and thus the morphology of CaCO₃ precipitated on glass particles.

硅酸盐玻璃是工业副产物如高炉炉渣和黄磷渣的主要成分，其反应性与其化学和纳米结构性质密切相关。为了深入了解这些材料用于二氧化碳矿化的可行性，本研究强调了Al2O3在合成CaO·Al2O3·SiO2玻璃碳酸化中的作用。Al2O3的掺入通过在多个长度尺度上改变玻璃结构来阻碍碳化反应。在原子尺度上，[AlO4]−的形成去除了作为Ca2+/H+交换位点的非桥接氧，并通过与处于Q4态的[SiO4]聚集而破坏了Ca2+通道。在纳米尺度上，在高铝玻璃中观察到相分离区。在碳化过程中（pH = 6时），Al在玻璃颗粒表面的重吸附优先于Ca2+。这种影响阻碍了非均相成核，从而阻碍了CaCO3在玻璃颗粒上的析出。

{"title":"Effect of alumina on the carbonation reactivity of calcium aluminosilicate glasses","authors":"Chen Li , Qiaomu Zheng , Bo Liu , Jiaqi Li , Weihao Zhu , Yuan Fang , Kaiming Peng , Zuhua Zhang , Zhengwu Jiang","doi":"10.1016/j.cemconres.2025.108023","DOIUrl":"10.1016/j.cemconres.2025.108023","url":null,"abstract":"<div><div>Reactivity of silicate glasses, the main component of industrial byproducts such as blast furnace slag and yellow phosphorus slag, is highly linked with their chemical and nano-structural properties. To provide insights on the viability of such materials for use in CO<sub>2</sub> mineralization, this study highlights the role of Al<sub>2</sub>O<sub>3</sub> in the carbonation of synthetic CaO·Al<sub>2</sub>O<sub>3</sub>·SiO<sub>2</sub> glasses. The incorporation of Al<sub>2</sub>O<sub>3</sub> impedes the carbonation reaction by modifying the glass structure at multiple length scales. At the atomic scale, the formation of [AlO<sub>4</sub>]<sup>−</sup> removes the non-bridging oxygens which serve as sites for Ca<sup>2+</sup>/H<sup>+</sup> exchange, and disrupts the Ca<sup>2+</sup> channels by clustering with [SiO<sub>4</sub>] in the Q<sup>4</sup> state. At the nanoscale, phase-separated regions were observed particularly in high-Al glasses. During carbonation (when pH = 6), the Al species re-adsorbed on the surface of glass particles preferentially to Ca<sup>2+</sup>. This effect hinders the heterogeneous nucleation and thus the morphology of CaCO<sub>3</sub> precipitated on glass particles.</div></div>","PeriodicalId":266,"journal":{"name":"Cement and Concrete Research","volume":"199 ","pages":"Article 108023"},"PeriodicalIF":13.1,"publicationDate":"2025-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144887311","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Simultaneous formation and decomposition of calcium silicate hydrate under carbonation in water 水中碳酸化作用下水合硅酸钙的同时生成与分解

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

Cement and Concrete Research

Pub Date : 2025-08-21 DOI: 10.1016/j.cemconres.2025.108021

Yuxi Cai , Pan Feng , Xin Liu , Xuyan Shen , Barbara Lothenbach

Carbonation curing captures CO₂ while rapidly gaining strength, as calcium silicate hydrate (C-S-H) precipitates and carbonates simultaneously. The simultaneous formation and decomposition of C-S-H under carbonation was investigated systematically in C-S-H suspensions at an initial pH of 13.5. Four distinct periods were observed: initial carbonation, rapid decomposition, slow ongoing and quasi-stable period. During the initial time, large quantities of C-S-H formed at maintained high pH, Subsequently, calcium in the liquid and C-S-H interlayer was consumed. With Ca/Si decreased to below 0.78, the rapid decomposition period proceeded with the decomposition of main layer, while silicate chains dissolved. Silica gel is formed in the slow ongoing period with pH < 11.0, which dominates with calcium carbonate in the quasi-stable period at a stable pH of 10, remaining small amount of residual C-S-H. Understanding the simultaneous formation and carbonation process of C-S-H contributes to understanding the microstructural evolution of cements during carbonation curing.

碳化固化捕获二氧化碳，同时迅速获得强度，因为水合硅酸钙（C-S-H）同时沉淀和碳化。在初始pH为13.5的C-S-H悬浮液中，系统地研究了碳化作用下C-S-H的同时生成和分解。观察到初始碳酸化、快速分解、缓慢进行和准稳定四个阶段。在初始阶段，在保持高pH条件下形成大量的C-S-H，随后，液体和C-S-H中间层中的钙被消耗。当Ca/Si降至0.78以下时，主层分解进入快速分解期，硅酸盐链溶解。硅胶在pH <； 11.0的缓慢持续期形成，在pH稳定为10的准稳定期以碳酸钙为主，剩余少量残留C-S-H。了解C-S-H的同时形成和碳化过程有助于理解水泥在碳化固化过程中的微观结构演化。

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引用次数: 0

Unravelling thermal conduction mechanisms in microwave-cured cement-based composites: Transform from phonon- to electron-based conduction channels driven by nano carbon black 微波固化水泥基复合材料的热传导机制：由纳米炭黑驱动的声子传导通道向电子传导通道的转变

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

Cement and Concrete Research

Pub Date : 2025-08-19 DOI: 10.1016/j.cemconres.2025.108013

Wangyang Xu , Dingqiang Fan , Rui Yu

Microwave curing offers energy-efficient concrete treatment, but inherent thermal non-uniformity causes microstructural deterioration and potential explosion due to phonon-dominated thermal conduction. This study introduces nano carbon black (nCB) to construct electron-based conductive pathways for enhancing thermal uniformity, while clarifying the synergistic microwave-hydration mechanisms. The incorporation of nCB improved microwave absorption and constructed thermal channels within concrete, thereby promoting uniform heat distribution and increasing early-age strength by ∼70 %. Moreover, nCB-optimized microwave curing accelerated hydration, promoting C-S-H gel polymerization and modifying crystalline phases like ettringite and portlandite. Multiphysics simulations demonstrated that suitable nCB content enhanced microwave thermal conduction through constructed thermal channels, despite the inherent non-uniformity of electromagnetic fields. The dominant thermal conduction mechanism shifted from phonon- to electron-based conduction by incorporating nCB, driven by synergistic effects of dipole polarization, interfacial polarization, and conduction loss. This work offers a new strategy for optimizing microwave-curing behavior through nanoscale thermal design in cement-based composites.

微波固化是一种节能的混凝土处理方法，但其固有的热不均匀性会导致微观结构恶化，并可能因声子主导的热传导而发生爆炸。本研究引入纳米炭黑（nCB）构建电子基导电通道，提高热均匀性，同时阐明微波水化协同机理。nCB的掺入改善了微波吸收，并在混凝土内部构建了热通道，从而促进了均匀的热分布，并将早期强度提高了约70%。此外，ncb优化的微波固化加速了水化，促进了C-S-H凝胶聚合，并修饰了钙矾石和波特兰石等晶体相。多物理场模拟表明，尽管电磁场固有的不均匀性，但适当的nCB含量增强了通过构建的热通道的微波热传导。在偶极极化、界面极化和传导损失的协同作用下，加入nCB后，主要的热传导机制由声子基传导转变为电子基传导。本研究为通过纳米尺度热设计优化水泥基复合材料的微波固化行为提供了一种新的策略。

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引用次数: 0

How siderite (FeCO3) enhances the sulfate resistance of cementitious systems 菱铁矿（FeCO3）如何增强胶凝体系的抗硫酸盐性

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

Cement and Concrete Research

Pub Date : 2025-08-14 DOI: 10.1016/j.cemconres.2025.108010

Marjorie Pons Pineyro , Florian R. Steindl , Isabel Galan , Augusto Cezar Maciel Soares , Florian Mittermayr

Siderite has recently emerged as a promising reactive SCM in Portland cement systems, with potential to enhance concrete durability. This study systematically investigates the resistance of siderite-containing mortars and pastes to external sulfate attack by evaluating both their expansion behavior and chemical stability in Na₂SO₄ solutions. Microstructural, mineralogical, and chemical changes were thoroughly characterized. When used either as a fine aggregate or as a partial binder replacement (10–50 wt%), siderite significantly improved the sulfate resistance of OPC systems. Remarkably, OPC–FeCO₃ blends exhibited lower expansion than even highly sulfate-resistant cements such as C₃A-free CEM I SR-0 and CEM III/B. This enhanced resistance is attributed to the partial consumption of portlandite, the stabilization of primary ettringite during hydration, and the formation of less expansive Fe-rich ettringite during sulfate exposure. Our findings highlight how highly relevant durability issues of OPC can be improved with readily available natural Fe carbonates.

菱铁矿最近作为一种很有前途的反应性SCM出现在波特兰水泥系统中，具有提高混凝土耐久性的潜力。本研究通过评估含菱铁矿砂浆和膏体在Na2SO4溶液中的膨胀行为和化学稳定性，系统地研究了它们对外部硫酸盐侵蚀的抗性。显微结构、矿物学和化学变化得到了全面的表征。当用作细骨料或部分替代粘合剂（10-50 wt%）时，菱铁矿显著提高了OPC体系的抗硫酸盐性。值得注意的是，OPC-FeCO3共混物的膨胀率甚至低于不含c3a的CEM I SR-0和CEM III/B等高抗硫酸盐水泥。这种增强的抗性是由于波特兰铁矿的部分消耗，水化过程中原生钙矾石的稳定，以及硫酸盐暴露过程中形成的膨胀较小的富铁钙矾石。我们的研究结果强调了与OPC高度相关的耐久性问题可以用现成的天然碳酸铁来改善。

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引用次数: 0

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