Cement and Concrete Research最新文献

{"title":"The monocarbonate Ca2Al1-xFex(OH)6·½CO3·nH2O AFm system","authors":"Aurore Lechevallier, Yunge Bai, Antoine Rochelet, Rodolphe Thirouard, Mohend Chaouche, Evelyne Prat, Jérôme Soudier, Guillaume Renaudin","doi":"10.1016/j.cemconres.2025.107804","DOIUrl":"https://doi.org/10.1016/j.cemconres.2025.107804","url":null,"abstract":"With the growing emphasis on reducing CO<ce:inf loc=\"post\">2</ce:inf> emissions, new hydraulic binders are gaining attention. Understanding the hydration products of these new binders is crucial. This study investigates mixed Al/Fe-CO<ce:inf loc=\"post\">3</ce:inf> AFm hydrates. This research proposes two methods to synthesize CO<ce:inf loc=\"post\">3</ce:inf>-AFm phases with varying proportions of trivalent Al<ce:sup loc=\"post\">3+</ce:sup> and Fe<ce:sup loc=\"post\">3+</ce:sup> cations, followed by a thorough characterization of the samples. Results showed that Al-rich samples crystallized only in the triclinic <ce:italic>P</ce:italic>1 space group, whereas the Fe-containing CO<ce:inf loc=\"post\">3</ce:inf>-AFm phase crystallized in both the triclinic <ce:italic>P</ce:italic>1 and trigonal <ce:italic>R</ce:italic><mml:math altimg=\"si11.svg\"><mml:mover accent=\"true\"><mml:mn>3</mml:mn><mml:mo stretchy=\"true\">¯</mml:mo></mml:mover><mml:mi>c</mml:mi></mml:math> space groups. A complete solid solution between the two end-members (Ca<ce:inf loc=\"post\">2</ce:inf>Al(OH)<ce:inf loc=\"post\">6</ce:inf>⋅(CO<ce:inf loc=\"post\">3</ce:inf>)<ce:inf loc=\"post\">0.5</ce:inf>⋅2.5H<ce:inf loc=\"post\">2</ce:inf>O and Ca<ce:inf loc=\"post\">2</ce:inf>Fe(OH)<ce:inf loc=\"post\">6</ce:inf>⋅(CO<ce:inf loc=\"post\">3</ce:inf>)<ce:inf loc=\"post\">0.5</ce:inf>⋅2.5H<ce:inf loc=\"post\">2</ce:inf>O) was confirmed with triclinic symmetry, whereas a partial solid solution was observed for the rhombohedral Ca<ce:inf loc=\"post\">2</ce:inf>Al<ce:inf loc=\"post\">1-<ce:italic>x</ce:italic></ce:inf>Fe<ce:inf loc=\"post\"><ce:italic>x</ce:italic></ce:inf>(OH)<ce:inf loc=\"post\">6</ce:inf>⋅(CO<ce:inf loc=\"post\">3</ce:inf>)<ce:inf loc=\"post\">0.5</ce:inf>⋅3H<ce:inf loc=\"post\">2</ce:inf>O higher hydrate with ∼0.33 ≤ <ce:italic>x</ce:italic> ≤ 1. This study enhances the characterization of Al/Fe-mixed CO<ce:inf loc=\"post\">3</ce:inf>-AFm phases that develop during the hydration of binders containing iron and aluminum, offering crucial insights for developing new sustainable construction materials.","PeriodicalId":266,"journal":{"name":"Cement and Concrete Research","volume":"5 1","pages":""},"PeriodicalIF":11.4,"publicationDate":"2025-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143027382","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}

{"title":"High-temperature strengthening of Portland cementitious materials by surface micro-ceramization","authors":"Weizheng Shi, Zixiao Wang, Chaoqun Li, Qingya Sun, Weiqiang Wang, Shuxin Deng, Weijin Li, Aming Xie","doi":"10.1016/j.cemconres.2025.107790","DOIUrl":"https://doi.org/10.1016/j.cemconres.2025.107790","url":null,"abstract":"This work prepares a novel cementitious material with high-temperature strengthening by adding titanium diboride (TiB₂) powders into Portland cement. The influences of TiB₂ on the physicochemical properties of paste samples before and after high-temperature treatment (the maximum is 900 °C) are investigated. Results indicated that the pore structure of hardened paste is refined after curing because of the filling effects of TiB₂ micron powders. During the heating, the ceramic phases are formed from the outer layer to the inner layer in the hardened paste because of the high-temperature oxidability of TiB₂, strengthening the matrix significantly (the highest compressive strength value increase is about 55.2% compared to the initial value). A random forest algorithm model analyses the contributions of matrix compositions and porosity on the compressive strength of hardened paste. The potential reaction mechanisms among the TiB₂ and the main hydrates at high temperatures are suggested.","PeriodicalId":266,"journal":{"name":"Cement and Concrete Research","volume":"23 1","pages":""},"PeriodicalIF":11.4,"publicationDate":"2025-01-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142989101","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}

{"title":"Effects of varying grades/pretreatments of recycled aggregates on the development of pore structures and ITZs within reactive magnesia cement (RMC) concrete","authors":"Yufeng Song, Jiaze Wang, Yinjie Huang, Jiawen Wang, Yitian Weng, Rui Ma, Kevin Seng Hong Pang, Shaoqin Ruan","doi":"10.1016/j.cemconres.2025.107782","DOIUrl":"https://doi.org/10.1016/j.cemconres.2025.107782","url":null,"abstract":"This study explores the influence of incorporating recycled aggregate (RA) and CO<ce:inf loc=\"post\">2</ce:inf>-pretreated recycled aggregate (CRA) in reactive magnesia concrete (RMC) formulations. Through comprehensive microscopic characterizations, the phase composition, carbonation degree, pore structure, and interfacial transition zone (ITZ) characteristics are examined in both interior and exterior regions of specimens. The findings highlight that RA and CRA contribute to a 28 d strength in RMC formulations 14% and 25% higher than that with NA, respectively. This enhancement is attributed to internal curing and significantly increased channels for CO<ce:inf loc=\"post\">2</ce:inf> diffusion within (C)RA specimens, leading to improvements in the modulus, hardness, and microstructures of the interior region—the traditionally weaker part in RMC-based concrete. Furthermore, a robust linear correlation is observed between ITZ characteristics, porosity, and compressive strength of CO<ce:inf loc=\"post\">2</ce:inf>-cured specimens. Finally, utilizing different grades of RA improves the performance of RMC-based concrete to varying degrees while reducing costs, thus potentially expanding the application of RA in practical RMC-based concrete scenarios, regardless of RA quality.","PeriodicalId":266,"journal":{"name":"Cement and Concrete Research","volume":"17 1","pages":""},"PeriodicalIF":11.4,"publicationDate":"2025-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142988075","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}

{"title":"Corrigendum to “Influence of silica fume addition and content on the early hydration of calcium aluminate cement — The role of soluble silicon” [Cem. Concr. Res. 184 (2024) 107618]","authors":"Tillmann Schramm, Jürgen Neubauer, Friedlinde Goetz-Neunhoeffer","doi":"10.1016/j.cemconres.2025.107787","DOIUrl":"https://doi.org/10.1016/j.cemconres.2025.107787","url":null,"abstract":"The authors regret a calculation error regarding the dilution factor which affects the absolute ion concentration values stated in the above paper and therefore also the corresponding calculated saturation indices. All stated concentration values (text and figures) need to be multiplied by a factor of 2.25. However, the authors would like to highlight that this does not affect any statements or conclusions made throughout evaluation and discussion of the data since it was focused on the qualitative evolution and comparison of the mixes.","PeriodicalId":266,"journal":{"name":"Cement and Concrete Research","volume":"55 1","pages":""},"PeriodicalIF":11.4,"publicationDate":"2025-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142987828","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}

{"title":"Surface whitening mechanism of ettringite rich decorative mortar","authors":"Xianping Liu, Hanqing Gao, Hervé Fryda, Peiming Wang","doi":"10.1016/j.cemconres.2025.107786","DOIUrl":"https://doi.org/10.1016/j.cemconres.2025.107786","url":null,"abstract":"This study investigates the surface whitening mechanism of ettringite rich decorative mortars. Surface whitening was triggered through an exaggerated test scenario with a highly porous simplified mortar and a series of wet/dry cycles. Based on correlative light-electron microscopy observation, soak solution and mineralogical composition analyses, a mechanism is proposed: surface whitening is due to large agglomerates (&gt;100 μm) of further hydrates (AFt phase and AFm phase) being formed in the large pores of the mortar surface during the drying process. The degree of surface whitening does not follow a continuous increase over cycle numbers, but rather evolves to a maximum after which more cycles lead to reduced surface whitening. This surface clearing and reduced whitening is explained by the disappearance of the hydrate agglomerates caused by full carbonation of AFt phase and AFm phase, transforming to small crystals of CaCO₃ and secondary Al(OH)₃, releasing the color of the pigments.","PeriodicalId":266,"journal":{"name":"Cement and Concrete Research","volume":"54 1","pages":""},"PeriodicalIF":11.4,"publicationDate":"2025-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142987109","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}

{"title":"Dipotassium hydrogen phosphate activated Al-rich steel slag: The role of layered double hydroxides and aluminum hydrate gel","authors":"Mengyu Zhu, Qingliang Yu, S.R. van der Laan, Yuxuan Chen","doi":"10.1016/j.cemconres.2025.107783","DOIUrl":"https://doi.org/10.1016/j.cemconres.2025.107783","url":null,"abstract":"Due to absence of C-S-H gel, chemically activated mixed Al-rich steel slag often shows low early-age strength. This work proposes a novel method to accelerate the hydration of Al-rich steel slag by dipotassium hydrogen phosphate (DHP) activation. Results reveal that DHP significantly promotes the formation of layered double hydroxides (LDHs) by increasing pH of the pore solution and supplying phosphate ions as the interlayer anion. Ca-Al-LDHs competes with the &lt;span&gt;&lt;span style=\"\"&gt;&lt;/span&gt;&lt;span data-mathml='&lt;math xmlns=\"http://www.w3.org/1998/Math/MathML\"&gt;&lt;msup is=\"true\"&gt;&lt;mi is=\"true\"&gt;Ca&lt;/mi&gt;&lt;mrow is=\"true\"&gt;&lt;mn is=\"true\"&gt;2&lt;/mn&gt;&lt;mo is=\"true\"&gt;+&lt;/mo&gt;&lt;/mrow&gt;&lt;/msup&gt;&lt;/math&gt;' role=\"presentation\" style=\"font-size: 90%; display: inline-block; position: relative;\" tabindex=\"0\"&gt;&lt;svg aria-hidden=\"true\" focusable=\"false\" height=\"2.548ex\" role=\"img\" style=\"vertical-align: -0.235ex;\" viewbox=\"0 -995.6 2227.4 1096.9\" width=\"5.173ex\" xmlns:xlink=\"http://www.w3.org/1999/xlink\"&gt;&lt;g fill=\"currentColor\" stroke=\"currentColor\" stroke-width=\"0\" transform=\"matrix(1 0 0 -1 0 0)\"&gt;&lt;g is=\"true\"&gt;&lt;g is=\"true\"&gt;&lt;use xlink:href=\"#MJMAIN-43\"&gt;&lt;/use&gt;&lt;use x=\"722\" xlink:href=\"#MJMAIN-61\" y=\"0\"&gt;&lt;/use&gt;&lt;/g&gt;&lt;g is=\"true\" transform=\"translate(1223,432)\"&gt;&lt;g is=\"true\"&gt;&lt;use transform=\"scale(0.707)\" xlink:href=\"#MJMAIN-32\"&gt;&lt;/use&gt;&lt;/g&gt;&lt;g is=\"true\" transform=\"translate(353,0)\"&gt;&lt;use transform=\"scale(0.707)\" xlink:href=\"#MJMAIN-2B\"&gt;&lt;/use&gt;&lt;/g&gt;&lt;/g&gt;&lt;/g&gt;&lt;/g&gt;&lt;/svg&gt;&lt;span role=\"presentation\"&gt;&lt;math xmlns=\"http://www.w3.org/1998/Math/MathML\"&gt;&lt;msup is=\"true\"&gt;&lt;mi is=\"true\"&gt;Ca&lt;/mi&gt;&lt;mrow is=\"true\"&gt;&lt;mn is=\"true\"&gt;2&lt;/mn&gt;&lt;mo is=\"true\"&gt;+&lt;/mo&gt;&lt;/mrow&gt;&lt;/msup&gt;&lt;/math&gt;&lt;/span&gt;&lt;/span&gt;&lt;script type=\"math/mml\"&gt;&lt;math&gt;&lt;msup is=\"true\"&gt;&lt;mi is=\"true\"&gt;Ca&lt;/mi&gt;&lt;mrow is=\"true\"&gt;&lt;mn is=\"true\"&gt;2&lt;/mn&gt;&lt;mo is=\"true\"&gt;+&lt;/mo&gt;&lt;/mrow&gt;&lt;/msup&gt;&lt;/math&gt;&lt;/script&gt;&lt;/span&gt; used to form metastable C&lt;sub&gt;2&lt;/sub&gt;AH&lt;sub&gt;8,&lt;/sub&gt; thereby releasing additional &lt;span&gt;&lt;span style=\"\"&gt;&lt;/span&gt;&lt;span data-mathml='&lt;math xmlns=\"http://www.w3.org/1998/Math/MathML\"&gt;&lt;mi is=\"true\"&gt;Al&lt;/mi&gt;&lt;msubsup is=\"true\"&gt;&lt;mfenced close=\")\" open=\"(\" is=\"true\"&gt;&lt;mi is=\"true\"&gt;OH&lt;/mi&gt;&lt;/mfenced&gt;&lt;mn is=\"true\"&gt;4&lt;/mn&gt;&lt;mo is=\"true\"&gt;&amp;#x2212;&lt;/mo&gt;&lt;/msubsup&gt;&lt;/math&gt;' role=\"presentation\" style=\"font-size: 90%; display: inline-block; position: relative;\" tabindex=\"0\"&gt;&lt;svg aria-hidden=\"true\" focusable=\"false\" height=\"3.009ex\" role=\"img\" style=\"vertical-align: -0.812ex;\" viewbox=\"0 -945.9 4154.1 1295.7\" width=\"9.648ex\" xmlns:xlink=\"http://www.w3.org/1999/xlink\"&gt;&lt;g fill=\"currentColor\" stroke=\"currentColor\" stroke-width=\"0\" transform=\"matrix(1 0 0 -1 0 0)\"&gt;&lt;g is=\"true\"&gt;&lt;use xlink:href=\"#MJMAIN-41\"&gt;&lt;/use&gt;&lt;use x=\"750\" xlink:href=\"#MJMAIN-6C\" y=\"0\"&gt;&lt;/use&gt;&lt;/g&gt;&lt;g is=\"true\" transform=\"translate(1195,0)\"&gt;&lt;g is=\"true\"&gt;&lt;use x=\"0\" xlink:href=\"#MJMAIN-28\" y=\"0\"&gt;&lt;/use&gt;&lt;g is=\"true\" transform=\"translate(389,0)\"&gt;&lt;use xlink:href=\"#MJMAIN-4F\"&gt;&lt;/use&gt;&lt;use x=\"778\" xlink:href","PeriodicalId":266,"journal":{"name":"Cement and Concrete Research","volume":"204 1","pages":""},"PeriodicalIF":11.4,"publicationDate":"2025-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142961937","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}

{"title":"Effect of curing regimes on composition and microstructure of blended pastes: Insight into later-age hydration mechanism","authors":"Liming Huang, Luping Tang, Zhijun Dong, Birhan Alkadir Abdulahi, Zhenghong Yang","doi":"10.1016/j.cemconres.2025.107785","DOIUrl":"https://doi.org/10.1016/j.cemconres.2025.107785","url":null,"abstract":"Understanding the hydration of composite binders is essential for decarbonizing the cement industry. This study investigated the microstructure and composition of pastes with either fly ash or slag after different long-term curing. Results show that the elevated temperature slightly reduces the capillary pore volume and internal RH of sealed samples. Water curing largely enhances hydration of fly ash and slag after the first week, forming later-age products in surface zone with stabilized Mc and Hc. This increases both gel and capillary pore volumes. C-A-S-H in water-cured pastes has a longer mean chain length and extremely lower alkali uptake than that in sealed curing. Modelling results indicate that nucleation ceases in sealed pastes once thermodynamic limitations are reached due to self-desiccation. Even with adequate water, late-stage hydration remains kinetically constrained due to the slow nucleation and growth rate near the unhydrated surface, with diffusion likely being one of rate-controlling factors.","PeriodicalId":266,"journal":{"name":"Cement and Concrete Research","volume":"20 1","pages":""},"PeriodicalIF":11.4,"publicationDate":"2025-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142939645","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}

{"title":"Plastic shrinkage of concrete made with calcined clay-limestone cement","authors":"Mateusz Wyrzykowski, Carmelo Di Bella, Davide Sirtoli, Nikolajs Toropovs, Pietro Lura","doi":"10.1016/j.cemconres.2025.107784","DOIUrl":"https://doi.org/10.1016/j.cemconres.2025.107784","url":null,"abstract":"Concrete made with blended cements with high clinker replacement ratios may be at higher risk of plastic shrinkage cracking when experiencing high evaporation rates immediately after casting. This paper investigates the plastic shrinkage behavior of concretes made with a cement with clinker replacement by a blend of calcined clay and limestone, which was compared to a conventional Portland cement and a Portland-limestone cement. In order to assess the risk of cracking, we studied early deformations and accompanying processes in concretes exposed to fast evaporation in a wind tunnel. As could be expected from previous studies, concretes made with both blended cements experienced higher shrinkage and cracking compared to ordinary Portland cement, mainly due to their slower hydration caused by a lower clinker amount and higher dosage of superplasticizer. However, the extent of plastic shrinkage cracking was similar with calcined-clay limestone cement and Portland-limestone cement.","PeriodicalId":266,"journal":{"name":"Cement and Concrete Research","volume":"82 1","pages":""},"PeriodicalIF":11.4,"publicationDate":"2025-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142939633","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}

{"title":"Thermal properties of tricalcium aluminate: Molecular dynamics simulation and experimental approach","authors":"Prodip Kumar Sarkar, Guido Goracci, Jorge S. Dolado","doi":"10.1016/j.cemconres.2024.107780","DOIUrl":"https://doi.org/10.1016/j.cemconres.2024.107780","url":null,"abstract":"The energy sector is making a noticeable effort to migrate towards renewable energy to tackle the global warming effect. At large scale, a concentrated solar plant (CSP) is one of the viable options with limitations of steady heat generation due to the uncertainty of sunlight. Thermal batteries can mitigate the trouble to a large extent. Recently, concrete (artificial rock glued by cement) has become a point of interest for the research community as a cheap, nontoxic option. In this paper, thermo-mechanical properties of tricalcium aluminate (C<span><span style=\"\"></span><span data-mathml='&lt;math xmlns=\"http://www.w3.org/1998/Math/MathML\"&gt;&lt;msub is=\"true\"&gt;&lt;mrow is=\"true\" /&gt;&lt;mrow is=\"true\"&gt;&lt;mn is=\"true\"&gt;3&lt;/mn&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;/math&gt;' role=\"presentation\" style=\"font-size: 90%; display: inline-block; position: relative;\" tabindex=\"0\"><svg aria-hidden=\"true\" focusable=\"false\" height=\"1.509ex\" role=\"img\" style=\"vertical-align: -0.582ex;\" viewbox=\"0 -399.4 453.9 649.8\" width=\"1.054ex\" xmlns:xlink=\"http://www.w3.org/1999/xlink\"><g fill=\"currentColor\" stroke=\"currentColor\" stroke-width=\"0\" transform=\"matrix(1 0 0 -1 0 0)\"><g is=\"true\"><g is=\"true\"></g><g is=\"true\" transform=\"translate(0,-150)\"><g is=\"true\"><use transform=\"scale(0.707)\" xlink:href=\"#MJMAIN-33\"></use></g></g></g></g></svg><span role=\"presentation\"><math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub is=\"true\"><mrow is=\"true\"></mrow><mrow is=\"true\"><mn is=\"true\">3</mn></mrow></msub></math></span></span><script type=\"math/mml\"><math><msub is=\"true\"><mrow is=\"true\"></mrow><mrow is=\"true\"><mn is=\"true\">3</mn></mrow></msub></math></script></span>A) have been studied for the first time in the framework of molecular dynamics along with modulated differential scanning calorimetry (MDSC) based experiments. The outcome suggests high-temperature stability of the material with reasonably higher heat capacity and thermal conductivity useful for potential application for thermal battery. Heat transport mechanism at the atomistic level has thoroughly been discussed.","PeriodicalId":266,"journal":{"name":"Cement and Concrete Research","volume":"1 1","pages":""},"PeriodicalIF":11.4,"publicationDate":"2025-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142935160","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}

{"title":"The influence of portlandite, calcite, quartz and ettringite inclusions on the multiscale mechanical behaviors of C-S-H matrix","authors":"Zhe Zhang, Yuchen Hu, Lianyao Xiong, Guoqing Geng","doi":"10.1016/j.cemconres.2024.107781","DOIUrl":"https://doi.org/10.1016/j.cemconres.2024.107781","url":null,"abstract":"C-S-H is the primary binder in cement mixed with additional phases. It is essential to understand how different phases impact cement strength. This study presents an innovative method for preparing a binary system doped with C-S-H and additional phases to study the effects of these phases on the composite's strength. By blending C-S-H with various minerals, we control mineral content precisely. Using multiscale techniques including atomic force microscopy (AFM), hardness and modulus measurements, we quantify the effects of minerals on C-S-H composites. Findings reveal the intrinsic moduli of these phases significantly influence composites' hardness, while cohesion affect compression modulus. Notably, quartz has a higher intrinsic modulus but lower cohesion than C-S-H, resulting in larger hardness but lower compression modulus. Ettringite shows reduced hardness and compression modulus, while calcite and portlandite's effects remain ambiguous due to lower cohesion but larger intrinsic modulus. These insights offer pathways for enhancing cementitious composites' performance.","PeriodicalId":266,"journal":{"name":"Cement and Concrete Research","volume":"20 1","pages":""},"PeriodicalIF":11.4,"publicationDate":"2025-01-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142924777","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}