Cement and Concrete Research最新文献_第2页

Mesoscopic mechanisms of dicalcium silicate dissolution 硅酸二钙溶解的介观机理

IF 11.4 1区工程技术

Cement and Concrete Research Pub Date : 2024-12-31 DOI: 10.1016/j.cemconres.2024.107660

Yong Tao, Pablo Martin, Hegoi Manzano, Mohammad Javad Abdolhosseini Qomi

{"title":"Mesoscopic mechanisms of dicalcium silicate dissolution","authors":"Yong Tao, Pablo Martin, Hegoi Manzano, Mohammad Javad Abdolhosseini Qomi","doi":"10.1016/j.cemconres.2024.107660","DOIUrl":"https://doi.org/10.1016/j.cemconres.2024.107660","url":null,"abstract":"Dicalcium silicate dissolution is crucial in cement hydration and provides long-term durability. However, our understanding of its dissolution process is limited due to its multiscale nature. To resolve this limitation, we combine rare event molecular dynamics and kinetic Monte Carlo (KMC) techniques. At the nanoscale, we reveal the relationship between surface Ca2＋ coordination chemistry and dissolution free energy barriers. Leveraging this knowledge, KMC simulations accurately predict the apparent dissolution activation energy and the sigmoidal relationship between dissolution rate and solution activity observed in experiments. Importantly, we find that dislocations have minimal impact on dissolution rates in grains and fast-dissolving cleavages. Instead, these rates are primarily determined by spontaneous pit opening and coalescence on surfaces, and the receding corners and edges within dissolving grains. This multiscale framework paves the path for fundamental studies and quantitative prediction of dissolution–precipitation processes widely encountered in cement chemistry, carbon sequestration, and enhanced geothermal systems.","PeriodicalId":266,"journal":{"name":"Cement and Concrete Research","volume":"13 1","pages":""},"PeriodicalIF":11.4,"publicationDate":"2024-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142904752","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

Active rheology control of cementitious materials: New insights from magneto-responsive aggregates 胶凝材料的活性流变控制：来自磁响应聚集体的新见解

IF 11.4 1区工程技术

Cement and Concrete Research Pub Date : 2024-12-31 DOI: 10.1016/j.cemconres.2024.107707

Yiyuan Zhang, Yaxin Tao, Jose R.A. Godinho, Kim Van Tittelboom, Karel Lesage, Geert De Schutter

{"title":"Active rheology control of cementitious materials: New insights from magneto-responsive aggregates","authors":"Yiyuan Zhang, Yaxin Tao, Jose R.A. Godinho, Kim Van Tittelboom, Karel Lesage, Geert De Schutter","doi":"10.1016/j.cemconres.2024.107707","DOIUrl":"https://doi.org/10.1016/j.cemconres.2024.107707","url":null,"abstract":"This study aims to achieve active rheology control of cementitious materials from the new view of magneto-responsive aggregates. It provides a sound experimental validation, qualitative analysis and quantitative characterization of magnetorheological response and mechanism of cementitious materials containing responsive aggregates under a nozzle/pipe-like (inline) external magnetic field. Specially, the aggregate shape indicators, rheological responses and micro-/meso- structures are described. The physical, chemical and geometrical features of aggregates were determined by X-ray diffraction analysis (XRD), vibrating sample magnetometer (VSM), loose packing fraction, optical microscopy and X-ray computed tomography (CT). The slow penetration test and vane test were conducted to measure the structural build-up of fresh samples with and without an inline magnetic intervention by using a rheometer-based customized test setup. The spatial distribution of magneto-responsive aggregates was determined by employing X-ray CT. The internal skeletal contact properties of magneto-responsive aggregates including cluster orientation, cluster aspect ratio, cluster elongation, contact point number, contact length and contact area were characterized quantitatively from the 3D image. A newly developed magneto-responsive cement mortar which can adjust rheological properties in time and on demand was achieved. The alignments of magneto-responsive aggregates along the magnetic induction lines were visualized. The orientation of magneto-responsive aggregate clusters showed concentrated distribution. With the decrease of the cement-to-aggregate ratio and increase in the size of magneto-responsive aggregates, the field-induced yield stress and torque increased significantly, which also influenced the contact properties of magneto-responsive aggregates. These results are beneficial for the application of active rheology control of magneto-responsive cementitious materials.","PeriodicalId":266,"journal":{"name":"Cement and Concrete Research","volume":"325 1","pages":""},"PeriodicalIF":11.4,"publicationDate":"2024-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142904751","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

Semi-dry natural carbonation at different relative humidities: Degree of carbonation and reaction kinetics of calcium hydrates in cement paste 不同相对湿度下的半干自然碳化：水泥浆中水合钙的碳化程度和反应动力学

IF 11.4 1区工程技术

Cement and Concrete Research Pub Date : 2024-12-30 DOI: 10.1016/j.cemconres.2024.107777

Naohiko Saeki, Ryo Kurihara, Takahiro Ohkubo, Atsushi Teramoto, Yuya Suda, Ryoma Kitagaki, Ippei Maruyama

引用次数: 0

Phase profiling of carbonation-cured calcium sulfoaluminate cement 碳化固化硫铝酸钙水泥的物相分析

IF 11.4 1区工程技术

Cement and Concrete Research Pub Date : 2024-12-30 DOI: 10.1016/j.cemconres.2024.107776

Jihoon Park, Joonho Seo, Solmoi Park, Alam Cho, H.K. Lee

引用次数: 0

Impact of polymer binders on the aggregation modes of two-pieces CSH composites 聚合物粘结剂对两片CSH复合材料聚集模式的影响

IF 11.4 1区工程技术

Cement and Concrete Research Pub Date : 2024-12-29 DOI: 10.1016/j.cemconres.2024.107779

Jiwei Jia, Ali Zaoui, W. Sekkal

{"title":"Impact of polymer binders on the aggregation modes of two-pieces CSH composites","authors":"Jiwei Jia, Ali Zaoui, W. Sekkal","doi":"10.1016/j.cemconres.2024.107779","DOIUrl":"https://doi.org/10.1016/j.cemconres.2024.107779","url":null,"abstract":"Using polymer binders in cementitious materials significantly boosts their structural stability and durability for civil engineering applications. This study explored the role of polymeric binders in enhancing the morphological stability of calcium silicate hydrates (CSH) paste through molecular dynamics simulations. Most pure CSH configurations displayed larger voids and decreased stability, especially when the particles were initially spaced further apart. Among the tested polymers, polyvinyl alcohol (PVA) showed the most robust bonding to CSH, attributed to its abundant -OH groups. The integration of polymers led to a shift in aggregation toward a more stable face-to-face (F<img alt=\"single bond\" src=\"https://sdfestaticassets-us-east-1.sciencedirectassets.com/shared-assets/55/entities/sbnd.gif\" style=\"vertical-align:middle\"/>F) configuration, increasing the contact area, and boosting overall stability. At large distances, the Coulombic force acted aggregation in the initial phase but is soon overtaken by the vdW force, which plays the primary role in driving the aggregation process. These findings corroborate existing theoretical models and introduce fresh insights from experimental organic-inorganic interactions, providing substantial implications for the development of advanced cementitious composites.","PeriodicalId":266,"journal":{"name":"Cement and Concrete Research","volume":"14 1","pages":""},"PeriodicalIF":11.4,"publicationDate":"2024-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142888270","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

Discussion of the paper “Effect of the chemical composition of synthetic alkali-silica gels on their structure, swelling behavior and water uptake” by Miriam E. Krüger, Harald Hilbig, Ludwig Stelzner and Alisa Machner, Cem. Conc. Res. 184 (2024): 107596 对Miriam E. kr<e:1>格、Harald Hilbig、Ludwig Stelzner和Alisa Machner合著的论文《合成碱-硅胶的化学成分对其结构、膨胀行为和吸水性的影响》的讨论。浓缩的。Res. 184 (2024): 107596

IF 11.4 1区工程技术

Cement and Concrete Research Pub Date : 2024-12-29 DOI: 10.1016/j.cemconres.2024.107778

Andreas Leemann

引用次数: 0

Effects of environmental exposure on Portland cement Type IL 环境暴露对IL型硅酸盐水泥的影响

IF 11.4 1区工程技术

Cement and Concrete Research Pub Date : 2024-12-24 DOI: 10.1016/j.cemconres.2024.107775

Rotana Hay, Parham Aghdasi

引用次数: 0

Impact of nesquehonite on hydration and strength of MgO-based cements nesquehonite对mgo基水泥水化强度的影响

IF 11.4 1区工程技术

Cement and Concrete Research Pub Date : 2024-12-20 DOI: 10.1016/j.cemconres.2024.107772

Paula Montserrat-Torres, Frank Winnefeld, Barbara Lothenbach

{"title":"Impact of nesquehonite on hydration and strength of MgO-based cements","authors":"Paula Montserrat-Torres, Frank Winnefeld, Barbara Lothenbach","doi":"10.1016/j.cemconres.2024.107772","DOIUrl":"https://doi.org/10.1016/j.cemconres.2024.107772","url":null,"abstract":"Hydrated magnesium carbonate cements prepared from MgO and carbonates such as hydromagnesite (Mg5(CO3)4(OH)2·4H2O) or nesquehonite (MgCO3ˑ3H2O) have potential for carbon sequestration during hardening. This study investigates the hydration of MgO/nesquehonite blends with up to 50 wt% of nesquehonite. Nesquehonite is highly reactive in the presence of MgO and water. The replacement of 50 wt% MgO by nesquehonite causes a significant increase of compressive strength at higher nesquehonite contents with up to 43–44 MPa after 28 days. However nesquehonite delays early hydration and strength development. Progressive changes in XRD peak position and peak broadening with increasing amount of carbonate indicate the formation of hydrous carbonate-containing brucite, HCB, with variable content of gel-like water and CO2 as confirmed by FTIR and TGA. This research indicate a high potential of nesquehonite to permanently store CO2 in MgO-based cements, as up to 15 wt% of CO2 can be taken up in the hydrated solid phase.","PeriodicalId":266,"journal":{"name":"Cement and Concrete Research","volume":"53 1","pages":""},"PeriodicalIF":11.4,"publicationDate":"2024-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142857996","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

An experimental review of the reaction paths followed by alkali-activated slag pastes 碱活性渣浆反应路径的实验回顾

IF 11.4 1区工程技术

Cement and Concrete Research Pub Date : 2024-12-17 DOI: 10.1016/j.cemconres.2024.107765

C. Paillard, N. Sanson, J.-B. d’Espinose de Lacaillerie, M. Palacios, P. Boustingorry, M. Jachiet, C. Giraudeau, V. Kocaba

{"title":"An experimental review of the reaction paths followed by alkali-activated slag pastes","authors":"C. Paillard, N. Sanson, J.-B. d’Espinose de Lacaillerie, M. Palacios, P. Boustingorry, M. Jachiet, C. Giraudeau, V. Kocaba","doi":"10.1016/j.cemconres.2024.107765","DOIUrl":"https://doi.org/10.1016/j.cemconres.2024.107765","url":null,"abstract":"NMR, XRD, mechanical strength measurements, bound water quantification and isothermal calorimetry were combined to contrast the degree of reaction and the paths followed by slag under the influence of three activators: NaOH, Na2CO3, and Na2Si1.7O4.4. NaOH-activation led to the concomitant formation of a very ordered C-A-S-H gel and of hydrotalcite, giving rise to early mechanical strength. For Na2Si1.7O4.4, a N-A-S-H gel formed first due to the high quantities of silicon in solution. This led to quick setting but no mechanical strength. Later, an amorphous C-A-S-H gel provided mechanical strength, while an aluminate phase precipitated. Finally, Na2CO3-activation also led to the formation of N-A-S-H, formation favored by the initial consumption of calcium to form calcite. This did not bring any real structuration and mechanical strength. Only after a few days of hydration did the mechanical strength improve with the precipitation of amorphous C-A-S-H, an ill-defined hydrated aluminate phase, and of gaylussite.","PeriodicalId":266,"journal":{"name":"Cement and Concrete Research","volume":"78 1","pages":""},"PeriodicalIF":11.4,"publicationDate":"2024-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142841253","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

On the variability of industrial Portland cement clinker: Microstructural characterisation and the fate of chemical elements 工业波特兰水泥熟料的变异性：微观结构特征和化学元素的归宿

IF 11.4 1区工程技术

Cement and Concrete Research Pub Date : 2024-12-16 DOI: 10.1016/j.cemconres.2024.107773

Wahab Abdul, Christiane Rößler, Holger Kletti, Chancel Mawalala, Alexander Pisch, Marcus N. Bannerman, Theodore Hanein

{"title":"On the variability of industrial Portland cement clinker: Microstructural characterisation and the fate of chemical elements","authors":"Wahab Abdul, Christiane Rößler, Holger Kletti, Chancel Mawalala, Alexander Pisch, Marcus N. Bannerman, Theodore Hanein","doi":"10.1016/j.cemconres.2024.107773","DOIUrl":"https://doi.org/10.1016/j.cemconres.2024.107773","url":null,"abstract":"Portland cement (PC) has been used and developed since the early 19th century. Although the compositional ranges of PC clinkers are generally specified in standards, there is a lack of information on the variability of industrial clinkers. Furthermore, with an increase in the use of alternative mineral and fuel feeds, it is important to understand the evolution of clinker chemistry and mineralogy which affects hydraulic reactivity. In this work, 27 clinkers, selected to span the limits of clinker manufacturing, are characterised using X-Ray fluorescence (XRF), X-Ray diffraction (XRD), and scanning electron microscopy - energy dispersive X-ray spectroscopy (SEM-EDX). These are compared against clinker data from literature, which provides a comparison between modern clinkers and historical clinkers analysed over 50 years ago. Finally, the clinker datasets are used to carry out and compare different calculation methods including Bogue, modified Bogue, and Gibbs energy minimisation using a published stoichiometric thermodynamic database.","PeriodicalId":266,"journal":{"name":"Cement and Concrete Research","volume":"19 1","pages":""},"PeriodicalIF":11.4,"publicationDate":"2024-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142825561","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