Cement and Concrete Research最新文献_第4页

Deformation of inclined concrete 3D printing: A computational fluid dynamics analysis 倾斜混凝土3D打印变形的计算流体力学分析

IF 13.1 1区工程技术

Cement and Concrete Research Pub Date : 2025-09-04 DOI: 10.1016/j.cemconres.2025.108032

Hongqian Lian , Tao Ding

引用次数: 0

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

Cement and Concrete Research Pub Date : 2025-09-04 DOI: 10.1016/j.cemconres.2025.108035

Mingrui Yang, Zhiming Yan, Zushu Li

{"title":"In-situ observations of tricalcium silicate formation in modified electric arc furnace slag under different temperature regimes","authors":"Mingrui Yang, Zhiming Yan, Zushu Li","doi":"10.1016/j.cemconres.2025.108035","DOIUrl":"10.1016/j.cemconres.2025.108035","url":null,"abstract":"<div><div>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 (C<sub>3</sub>S - 3CaO∙SiO<sub>2</sub>) 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 C<sub>3</sub>S 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 (C<sub>2</sub>S) and a calcium ferrite (CF) based slag. The process of C<sub>3</sub>S crystal growth was observed under both isothermal and non-isothermal conditions. Under isothermal condition with low degree of undercooling, the C<sub>3</sub>S crystals predominantly formed equiaxed shapes, whereas higher undercooling levels promoted the development of dendrites C<sub>3</sub>S. The growth of C<sub>3</sub>S crystals is accompanied by the transformation of C<sub>2</sub>S via the reaction: C<sub>2</sub>S (s) + CaO (l) → C<sub>3</sub>S (s). Extending the holding time at 1600 °C enhanced C<sub>3</sub>S nucleation, resulting in a higher C<sub>3</sub>S content in the slag.</div></div>","PeriodicalId":266,"journal":{"name":"Cement and Concrete Research","volume":"199 ","pages":"Article 108035"},"PeriodicalIF":13.1,"publicationDate":"2025-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144987633","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

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

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

{"title":"Conversion of hazardous waste into calcium sulfoaluminate cement: effect of alkalinity modulus on mineral composition and Fe2O3 incorporation in Ye'elimite","authors":"Di Yu , Jie Li , Mengxia Xu , Jun He , Bo Li , Yin Wang","doi":"10.1016/j.cemconres.2025.108028","DOIUrl":"10.1016/j.cemconres.2025.108028","url":null,"abstract":"<div><div>The production of calcium sulfoaluminate (CSA) cement using hazardous wastes can enhance its sustainability and economic benefits. Incorporating Fe<sub>2</sub>O<sub>3</sub> into ye'elimite can reduce the Al<sub>2</sub>O<sub>3</sub> 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 C<sub>2</sub>AS and Fe<sub>2</sub>SiO<sub>4</sub> 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 C<sub>4</sub>A<sub>3</sub><span><math><mover><mi>S</mi><mo>¯</mo></mover></math></span>-o to C<sub>4</sub>A<sub>3</sub><span><math><mover><mi>S</mi><mo>¯</mo></mover></math></span>-c and the slowed hydration. However, facilitated ye'elimite formation under higher Cm and increased Al<sub>2</sub>O<sub>3</sub> content in feedstock leads to more Fe<sub>2</sub>O<sub>3</sub> being incorporated into ye'elimite. This study provides guidance on regulating Fe<sub>2</sub>O<sub>3</sub> incorporation in the production of waste-based CSA cement clinker.</div></div>","PeriodicalId":266,"journal":{"name":"Cement and Concrete Research","volume":"199 ","pages":"Article 108028"},"PeriodicalIF":13.1,"publicationDate":"2025-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144930577","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

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

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

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

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

{"title":"A transfer learning-driven paradigm for understanding cryogenic freezing mechanisms in low water/binder cement-based composites","authors":"Yuan Feng , Lingyan Zhang , Dingqiang Fan , Kangning Liu , Rui Yu","doi":"10.1016/j.cemconres.2025.108027","DOIUrl":"10.1016/j.cemconres.2025.108027","url":null,"abstract":"<div><div>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 (R<sup>2</sup> > 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.</div></div>","PeriodicalId":266,"journal":{"name":"Cement and Concrete Research","volume":"199 ","pages":"Article 108027"},"PeriodicalIF":13.1,"publicationDate":"2025-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144913966","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

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

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

{"title":"Aluminum incorporation lowers the intrinsic mechanical properties of single-chain calcium silicate hydrate","authors":"Jiawei Wang , Ruoxi Yang , Paula Sanz-Camacho , Mathieu Duttine , Thomas Huthwelker , Jiaqi Li","doi":"10.1016/j.cemconres.2025.108026","DOIUrl":"10.1016/j.cemconres.2025.108026","url":null,"abstract":"<div><div>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 Al<img>O bond length relative to Si<img>O bond, and the different distortion indexes in AlO<sub><em>x</em></sub> 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 <em>c</em>-axis.</div></div>","PeriodicalId":266,"journal":{"name":"Cement and Concrete Research","volume":"199 ","pages":"Article 108026"},"PeriodicalIF":13.1,"publicationDate":"2025-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144903706","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

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

Cement and Concrete Research Pub Date : 2025-08-25 DOI: 10.1016/j.cemconres.2025.108022

Tausif E Elahi , Pablo Romero , Nishant Garg

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

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

{"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

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

{"title":"Simultaneous formation and decomposition of calcium silicate hydrate under carbonation in water","authors":"Yuxi Cai , Pan Feng , Xin Liu , Xuyan Shen , Barbara Lothenbach","doi":"10.1016/j.cemconres.2025.108021","DOIUrl":"10.1016/j.cemconres.2025.108021","url":null,"abstract":"<div><div>Carbonation curing captures CO<sub>2</sub> 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.</div></div>","PeriodicalId":266,"journal":{"name":"Cement and Concrete Research","volume":"199 ","pages":"Article 108021"},"PeriodicalIF":13.1,"publicationDate":"2025-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144887310","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

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

Cement and Concrete Research Pub Date : 2025-08-19 DOI: 10.1016/j.cemconres.2025.108013

Wangyang Xu , Dingqiang Fan , Rui Yu

{"title":"Unravelling thermal conduction mechanisms in microwave-cured cement-based composites: Transform from phonon- to electron-based conduction channels driven by nano carbon black","authors":"Wangyang Xu , Dingqiang Fan , Rui Yu","doi":"10.1016/j.cemconres.2025.108013","DOIUrl":"10.1016/j.cemconres.2025.108013","url":null,"abstract":"<div><div>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.</div></div>","PeriodicalId":266,"journal":{"name":"Cement and Concrete Research","volume":"199 ","pages":"Article 108013"},"PeriodicalIF":13.1,"publicationDate":"2025-08-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144865986","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