Cement and Concrete Research最新文献_第9页

Zn2+ as a dopant to stabilize hydrated magnesium carbonates Zn2+作为掺杂剂稳定水合碳酸镁

IF 10.9 1区工程技术

Cement and Concrete Research Pub Date : 2025-06-12 DOI: 10.1016/j.cemconres.2025.107963

Hoang Nguyen , Nirrupama Kamala Ilango , Frank Winnefeld , Barbara Lothenbach , Paivo Kinnunen

{"title":"Zn2+ as a dopant to stabilize hydrated magnesium carbonates","authors":"Hoang Nguyen , Nirrupama Kamala Ilango , Frank Winnefeld , Barbara Lothenbach , Paivo Kinnunen","doi":"10.1016/j.cemconres.2025.107963","DOIUrl":"10.1016/j.cemconres.2025.107963","url":null,"abstract":"<div><div>The formation of solid solutions of Mg‑carbonates incorporating Zn<sup>2+</sup> was investigated. The presence of Zn retarded the reaction of brucite at the early stages but increased its reaction in the long-term. The initially formed nesquehonite [MgCO<sub>3</sub>·3H<sub>2</sub>O] and brucite converted to dypingite [Mg<sub>5</sub>(CO<sub>3</sub>)<sub>4</sub>(OH)<sub>2</sub>·5H<sub>2</sub>O] with time, both in the absence and presence of Zn, while dypingite remained stable throughout the duration of the study (1 year). Zinc forms a solid solution with dypingite with a maximum Zn/(Mg + Zn) molar ratio of 0.01. The solid solution was found to be thermodynamically more stable than pure dypingite. With further increase of Zn beyond 0.01 Zn/(Mg + Zn) molar ratios, the excess zinc precipitates as X-ray amorphous phases with a possible Zn/Mg atomic ratio of 2 at early reaction time. The findings reported here confirm the possibility of solid solution formation in HMCs enabling the improved stability of certain HMCs for safe utilization as construction materials.</div></div>","PeriodicalId":266,"journal":{"name":"Cement and Concrete Research","volume":"197 ","pages":"Article 107963"},"PeriodicalIF":10.9,"publicationDate":"2025-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144271389","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

Reactive transport modelling of autogenous self-healing: Impact of portlandite content and degree of hydration 自愈的反应输运模型：波特兰石含量和水化程度的影响

IF 10.9 1区工程技术

Cement and Concrete Research Pub Date : 2025-06-11 DOI: 10.1016/j.cemconres.2025.107965

Daniel Lahmann , Wolf-Achim Kahl , Sylvia Keßler

引用次数: 0

Fatigue-dependent pull-out degradation of inclined hooked-end steel fibers in SFRCC: Experiments and mechanics-based modeling 斜钩端钢纤维在SFRCC中疲劳相关的拉出退化：实验和力学模型

IF 10.9 1区工程技术

Cement and Concrete Research Pub Date : 2025-06-07 DOI: 10.1016/j.cemconres.2025.107962

Mohamed Adel , Wang Li , Yan Xiao , Tamon Ueda

{"title":"Fatigue-dependent pull-out degradation of inclined hooked-end steel fibers in SFRCC: Experiments and mechanics-based modeling","authors":"Mohamed Adel , Wang Li , Yan Xiao , Tamon Ueda","doi":"10.1016/j.cemconres.2025.107962","DOIUrl":"10.1016/j.cemconres.2025.107962","url":null,"abstract":"<div><div>This study investigates the fatigue-induced degradation of fiber-bridging capacity in steel fiber-reinforced cementitious composites (SFRCC) under cyclic loading. Experimental and analytical investigations were employed to quantify interfacial degradation mechanisms. Hooked-end steel fibers embedded at 0°, 30°, 45°, and 60° inclinations within a concrete matrix were subjected to static and cyclic pull-out tests. Fibers were initially pulled out to simulate crack formation, followed by fatigue loading up to two million cycles or failure. Two failure mechanisms were observed: fiber pull-out and rupture, further validated through X-ray CT scans. Fiber rupture dominated at higher inclination angles, with significant surface matrix spalling. Fibers at 45° exhibited the highest degradation rate, with accelerated displacement evolution and shortened fatigue life. Mechanics-based models were developed to predict displacement evolution, fatigue life, and rupture behavior, demonstrating strong alignment with experimental results. The findings enhanced understanding of fatigue damage evolution in SFRCC and provide reliable frameworks for performance prediction.</div></div>","PeriodicalId":266,"journal":{"name":"Cement and Concrete Research","volume":"197 ","pages":"Article 107962"},"PeriodicalIF":10.9,"publicationDate":"2025-06-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144237629","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

Retention of niobium(V) by calcite and carbonated cement paste: quantitative description and impact of isosaccharinic acid and chloride 方解石和碳化水泥浆对铌(V)的保留：异糖酸和氯化物的定量描述和影响

IF 10.9 1区工程技术

Cement and Concrete Research Pub Date : 2025-06-06 DOI: 10.1016/j.cemconres.2025.107952

Nils Huber , R.E. Guidone , X. Gaona , K. Garbev , M. López-García , L. Alcubierre , F. Bocchese , S. Brassinnes , M. Altmaier , H. Geckeis

{"title":"Retention of niobium(V) by calcite and carbonated cement paste: quantitative description and impact of isosaccharinic acid and chloride","authors":"Nils Huber , R.E. Guidone , X. Gaona , K. Garbev , M. López-García , L. Alcubierre , F. Bocchese , S. Brassinnes , M. Altmaier , H. Geckeis","doi":"10.1016/j.cemconres.2025.107952","DOIUrl":"10.1016/j.cemconres.2025.107952","url":null,"abstract":"<div><div>Sorption experiments with niobium(V) in calcite and carbonated cement were conducted simulating cement degradation stage IV. <sup>93</sup>Nb and <sup>95</sup>Nb (<em>t</em><sub>1/2</sub> = 35.0 days) were used as probes of <sup>94</sup>Nb (<em>t</em><sub>1/2</sub> = 2·10<sup>4</sup> years), expected in nuclear waste. In calcite systems, an initial uptake (R<sub>d</sub> ≈ 10<sup>3</sup> L·kg<sup>−1</sup> at <em>t</em> = 3 days) was followed by a steady increase of distribution ratios with time (R<sub>d</sub> > 2·10<sup>4</sup> L·kg<sup>−1</sup> at <em>t</em> = 89 days). This was explained as fast adsorption, followed by slow incorporation into the calcite structure. The stronger uptake observed for carbonated cement is attributed to the presence of amorphous phases with larger surface area. The formation of complexes with isosaccharinic acid (ISA) slightly decreases Nb(V) sorption, whereas chloride has a minor effect on the uptake of Nb(V) up to 2.0 M NaCl. This work provides an improved quantitative description and mechanistic understanding of <sup>94</sup>Nb retention in repositories for nuclear waste.</div></div>","PeriodicalId":266,"journal":{"name":"Cement and Concrete Research","volume":"197 ","pages":"Article 107952"},"PeriodicalIF":10.9,"publicationDate":"2025-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144222379","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

Quantification of GGBS hydration using deep learning - A comparison with SEM-EDS mapping, PONKCS XRD and isothermal calorimetry methods 利用深度学习定量GGBS水化——与SEM-EDS图谱、PONKCS XRD和等温量热法的比较

IF 10.9 1区工程技术

Cement and Concrete Research Pub Date : 2025-06-05 DOI: 10.1016/j.cemconres.2025.107960

Yan Yu, Geng Guoqing

引用次数: 0

A reactive-transport framework to model carbonation performance of a hardened cement: the case of alkali-sulfate slag cement pastes 一个反应输运框架来模拟硬化水泥的碳化性能：碱-硫酸盐矿渣水泥膏体的情况

IF 10.9 1区工程技术

Cement and Concrete Research Pub Date : 2025-06-05 DOI: 10.1016/j.cemconres.2025.107961

Zengliang Yue , Yuvaraj Dhandapani , John L. Provis , Susan A. Bernal

{"title":"A reactive-transport framework to model carbonation performance of a hardened cement: the case of alkali-sulfate slag cement pastes","authors":"Zengliang Yue , Yuvaraj Dhandapani , John L. Provis , Susan A. Bernal","doi":"10.1016/j.cemconres.2025.107961","DOIUrl":"10.1016/j.cemconres.2025.107961","url":null,"abstract":"<div><div>This study introduces a novel reactive transport framework tailored for hardened cementitious materials, applied to a clinker-free sodium sulfate-activated slag cement as a case study. The modelling tool enables the prediction of CO<sub>2</sub>-induced alterations in the phase assemblage, transport properties (e.g. diffusivity, permeability, saturation, liquid volume fraction, and capillary pressure) in cementitious materials, pore solution pH, the composition of aluminium-substituted calcium silicate hydrate gel (C-A-S-H), and CO<sub>2</sub> sequestration profiles as a function of cover depth. The framework was applied to simulate one year of accelerated carbonation (1 % CO<sub>2</sub> <em>v</em>/v) and ten years of natural carbonation (0.04 % CO<sub>2</sub> v/v) under controlled temperature and humidity conditions, showing excellent alignment with experimental data. This framework represents a significant step forward in the state-of-the-art for predicting carbonation performance of cementitious materials, enabling calculation and estimation of CO<sub>2</sub> uptake capacity of cement systems, including those containing supplementary cementitious materials (SCMs) or based on alkali-activated binders.</div></div>","PeriodicalId":266,"journal":{"name":"Cement and Concrete Research","volume":"197 ","pages":"Article 107961"},"PeriodicalIF":10.9,"publicationDate":"2025-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144222378","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

Development of a risk assessment framework for pyrrhotite induced deterioration of concrete foundations in CT and MA CT和MA中磁黄铁矿引起的混凝土基础劣化风险评估框架的发展

IF 10.9 1区工程技术

Cement and Concrete Research Pub Date : 2025-06-05 DOI: 10.1016/j.cemconres.2025.107951

Leana Santos , Maria Chrysochoou , Kay Wille

引用次数: 0

Structure and properties of thaumasite and its aqueous interfaces revealed by molecular dynamics simulations 分子动力学模拟揭示了硫马锡及其水界面的结构和性质

IF 10.9 1区工程技术

Cement and Concrete Research Pub Date : 2025-06-05 DOI: 10.1016/j.cemconres.2025.107944

E.V. Tararushkin , G.S. Smirnov , N.D. Kondratyuk , A.G. Kalinichev

引用次数: 0

Impact of Ca/Si and Al/Si ratios on the composition and structure of the alumina-silica gel formed by wet carbonation of synthesized C-S-H in blends with portlandite and ettringite Ca/Si和Al/Si对合成的C-S-H与钾长石和钙长石共混物湿碳化形成的氧化铝-硅胶组成和结构的影响

IF 10.9 1区工程技术

Cement and Concrete Research Pub Date : 2025-06-02 DOI: 10.1016/j.cemconres.2025.107931

Jiayi Song , Maciej Zajac , Mohsen Ben Haha , Jørgen Skibsted

{"title":"Impact of Ca/Si and Al/Si ratios on the composition and structure of the alumina-silica gel formed by wet carbonation of synthesized C-S-H in blends with portlandite and ettringite","authors":"Jiayi Song , Maciej Zajac , Mohsen Ben Haha , Jørgen Skibsted","doi":"10.1016/j.cemconres.2025.107931","DOIUrl":"10.1016/j.cemconres.2025.107931","url":null,"abstract":"<div><div>It is well-established that aqueous carbonation of recycled concrete paste produces calcium carbonate and an amorphous alumina-silica gel as the main products. However, sparse information is available about the structure and composition of the gel. This work focuses on these properties by carbonation of synthesized C-S-H (Ca/Si = 1.75) alone and blended with portlandite and ettringite. Wet carbonation of pure ettringite results in an alumina gel with the approximate composition, Al<sub>2</sub>O<sub>3</sub>·7.4H<sub>2</sub>O, and including two distinct octahedral Al sites. For carbonated blends of C-S-H with ettringite, this phase is observed along with the alumina-silica gel. Increasing ettringite contents lead to significant changes in the structure of the alumina-silica gel and to increasing Al/Si ratios approaching the maximum of Al/Si = 1.0. For the blended samples, portlandite and ettringite carbonate independently and faster than the C-S-H phase, and both additional Ca and Al slow down the carbonation rate for the C-S-H phase.</div></div>","PeriodicalId":266,"journal":{"name":"Cement and Concrete Research","volume":"197 ","pages":"Article 107931"},"PeriodicalIF":10.9,"publicationDate":"2025-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144194563","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

Effect of Ca(OH)2 on the immobilization of simulated radioactive borate waste in metakaolin-based geopolymer waste forms Ca(OH)2对偏高岭土聚合物废物形态中模拟放射性硼酸盐废物固定化的影响

IF 10.9 1区工程技术

Cement and Concrete Research Pub Date : 2025-05-31 DOI: 10.1016/j.cemconres.2025.107946

Byoungkwan Kim , Brant Walkley , John L. Provis , Hyun-min Ma , Wooyong Um

{"title":"Effect of Ca(OH)2 on the immobilization of simulated radioactive borate waste in metakaolin-based geopolymer waste forms","authors":"Byoungkwan Kim , Brant Walkley , John L. Provis , Hyun-min Ma , Wooyong Um","doi":"10.1016/j.cemconres.2025.107946","DOIUrl":"10.1016/j.cemconres.2025.107946","url":null,"abstract":"<div><div>Geopolymers are promising candidates for immobilizing radioactive borate waste (BW), but their performance needs improvement as borate negatively affects their physicochemical properties such as compressive strength and setting time. This study investigated the effect of Ca(OH)₂ on geopolymer waste forms by varying the Ca/Al ratio (0.25–1.0). At a Ca/Al ratio of 0.25, Ca(OH)₂ tripled the compressive strength (5 to 14 MPa) by promoting geopolymerization reaction and forming C-(A)-S-H gel. The increased pH and the reactive Ca ions led to the decomposition of immobilized BW. A low Ca/Al ratio caused minimal structural changes, while higher ratios promoted C-(A)-S-H gel formation. Characterization results confirmed the formation of extensive geopolymers and a compact microstructure. Notably, in the geopolymer waste form with a Ca/Al ratio of 0.25, the cumulative fraction leached of B decreased by more than twofold and the leachability index increased from 7.5 to 8.7, compared to the Ca-free geopolymer waste form. This research provides insights into the role of calcium in immobilizing radioactive BW in geopolymers, emphasizing the importance of optimizing the Ca/Al ratio to enhance immobilization performance.</div></div>","PeriodicalId":266,"journal":{"name":"Cement and Concrete Research","volume":"197 ","pages":"Article 107946"},"PeriodicalIF":10.9,"publicationDate":"2025-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144185060","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