Pub Date : 2026-02-12DOI: 10.1016/j.cemconcomp.2026.106536
Hongwei Tian, Yi Song, Xiaodong Zhu, Yizhe Helian, Huangqi Wang, Xiangming Kong
{"title":"Retardation mechanism of alkali-activated slag by organo-silanes: From surface interaction to gel evolution","authors":"Hongwei Tian, Yi Song, Xiaodong Zhu, Yizhe Helian, Huangqi Wang, Xiangming Kong","doi":"10.1016/j.cemconcomp.2026.106536","DOIUrl":"https://doi.org/10.1016/j.cemconcomp.2026.106536","url":null,"abstract":"","PeriodicalId":519419,"journal":{"name":"Cement and Concrete Composites","volume":"92 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2026-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146160170","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-02-12DOI: 10.1016/j.cemconcomp.2026.106506
Nishad Ahmed, Sudipto Sarkar, Warda Ashraf
{"title":"Rheological and mechanical properties of carbon-negative 3D printed mortar using functionalized biochar","authors":"Nishad Ahmed, Sudipto Sarkar, Warda Ashraf","doi":"10.1016/j.cemconcomp.2026.106506","DOIUrl":"https://doi.org/10.1016/j.cemconcomp.2026.106506","url":null,"abstract":"","PeriodicalId":519419,"journal":{"name":"Cement and Concrete Composites","volume":"299 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2026-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146160169","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-02-10DOI: 10.1016/j.cemconcomp.2026.106535
Lema Deme Shumi, Piotr Latos, Izabela Klapiszewska, Anna Parus, Agnieszka Ślosarczyk, Teofil Jesionowski, Anna Chrobok, Łukasz Klapiszewski
{"title":"Tailored copper-based ionic liquids as multifunctional admixtures for cementitious materials","authors":"Lema Deme Shumi, Piotr Latos, Izabela Klapiszewska, Anna Parus, Agnieszka Ślosarczyk, Teofil Jesionowski, Anna Chrobok, Łukasz Klapiszewski","doi":"10.1016/j.cemconcomp.2026.106535","DOIUrl":"https://doi.org/10.1016/j.cemconcomp.2026.106535","url":null,"abstract":"","PeriodicalId":519419,"journal":{"name":"Cement and Concrete Composites","volume":"211 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2026-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146152983","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-02-10DOI: 10.1016/j.cemconcomp.2026.106514
Vanessa G. Cappellesso, Juan M. Etcheverry, Yury A. Villagran-Zaccardi, Elke Gruyaert, Kim Van Tittelboom, Nele De Belie
{"title":"Mitigating sulfate attack in self-healing concrete using bacteria-based or crystalline admixture healing agents","authors":"Vanessa G. Cappellesso, Juan M. Etcheverry, Yury A. Villagran-Zaccardi, Elke Gruyaert, Kim Van Tittelboom, Nele De Belie","doi":"10.1016/j.cemconcomp.2026.106514","DOIUrl":"https://doi.org/10.1016/j.cemconcomp.2026.106514","url":null,"abstract":"","PeriodicalId":519419,"journal":{"name":"Cement and Concrete Composites","volume":"33 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2026-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146152982","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-02-10DOI: 10.1016/j.cemconcomp.2026.106534
Ruizhe Shao, Chengqing Wu, Jun Li, Kaiyi Chi, Zizheng Yu
{"title":"Integrated static-dynamic and microstructural investigation of tensile performance in fibre-reinforced lunar concrete under cryogenic temperatures","authors":"Ruizhe Shao, Chengqing Wu, Jun Li, Kaiyi Chi, Zizheng Yu","doi":"10.1016/j.cemconcomp.2026.106534","DOIUrl":"https://doi.org/10.1016/j.cemconcomp.2026.106534","url":null,"abstract":"","PeriodicalId":519419,"journal":{"name":"Cement and Concrete Composites","volume":"59 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2026-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146152991","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Shrinkage-induced cracking, driven by high cementitious content and layer-by-layer fabrication, poses a significant challenge to the volumetric stability and large-scale application of 3D printed concrete (3DPC). This paper systematically and critically reviews recent advances in 3DPC shrinkage by deconstructing the complex interplay among materials, processes, and environmental factors governing its mechanisms, characterization, and control. The analysis reveals that shrinkage in 3DPC arises from coupled plastic, autogenous, and drying mechanisms. Crucially, the review identifies that the anisotropic and highly connected pore network at filament interfaces acts as a key driver of accelerated moisture transport and stress inhomogeneity, and representing a distinctive microstructural feature of 3DPC compared with conventional cast concrete. Current characterization methodologies are limited, as conventional tests fail to capture this layered anisotropy, and a unified standard remains absent. While mitigation strategies based on material design, curing, and structural optimization show promise, a systematic framework is lacking. By identifying critical research gaps, this review establishes a foundation for developing integrated control strategies, thereby advancing the long-term durability of 3DPC structures.
{"title":"Shrinkage in concrete additive manufacturing: A critical review of mechanisms, characterization, and control strategies","authors":"Chao Liu, Ruiyang Ma, Huawei Liu, Meiling Dai, Baixi Chen, Liangchao Liu, Zihao Wang, Guoliang Bai","doi":"10.1016/j.cemconcomp.2026.106516","DOIUrl":"https://doi.org/10.1016/j.cemconcomp.2026.106516","url":null,"abstract":"Shrinkage-induced cracking, driven by high cementitious content and layer-by-layer fabrication, poses a significant challenge to the volumetric stability and large-scale application of 3D printed concrete (3DPC). This paper systematically and critically reviews recent advances in 3DPC shrinkage by deconstructing the complex interplay among materials, processes, and environmental factors governing its mechanisms, characterization, and control. The analysis reveals that shrinkage in 3DPC arises from coupled plastic, autogenous, and drying mechanisms. Crucially, the review identifies that the anisotropic and highly connected pore network at filament interfaces acts as a key driver of accelerated moisture transport and stress inhomogeneity, and representing a distinctive microstructural feature of 3DPC compared with conventional cast concrete. Current characterization methodologies are limited, as conventional tests fail to capture this layered anisotropy, and a unified standard remains absent. While mitigation strategies based on material design, curing, and structural optimization show promise, a systematic framework is lacking. By identifying critical research gaps, this review establishes a foundation for developing integrated control strategies, thereby advancing the long-term durability of 3DPC structures.","PeriodicalId":519419,"journal":{"name":"Cement and Concrete Composites","volume":"15 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2026-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146146579","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Iron-rich copper slag (CS) has significant potential as a precursor to synthesize an eco-friendly alkali-activated binder (AAB). However, the cooperative participation of multiple elements in CS, such as Si, Al, Ca and Fe (especially the role of Fe), and the activation reaction kinetics lack a clear mechanistic understanding, hindering its large-scale applications in AAB. Herein, the alkali-activation conditions of CS were optimized, and the hydration mechanism and kinetics, mechanical performance, and environmental safety of CS-based alkali-activated binder (CS-AAB) were systematically evaluated. Under the optimized condition, the binder achieved remarkable compressive strengths of 56.7, 69.7, and 73.0 MPa at 3, 7, and 28 d, respectively. The characterization results and hydration kinetic analysis indicated the formation of calcium aluminosilicates (C-A-S-H, Ca2Al4Si8O24·7H2O and CaAl2Si4O12·4H2O), iron hydroxides (Fe(OH)3 and FeOOH) as the hydration products. XPS and Mössbauer spectroscopy analyses demonstrated that approximately 17.1% of the iron phases (6.6% from fayalite and 10.5% from ferrosilite) participated in the hydration. The dissolved Fe2+ was oxidized into Fe3+, simultaneously coprecipitating with OH- and incorporating into the C-A-S-H network as distorted octahedral and/or five-coordinated configurations. These findings highlight that the modifications to iron phases directly contribute to the material’s mechanical performance. Additionally, leaching tests confirmed that the heavy metals released from the CS-AAB were far below the limits specified in GB-5085.3–2007, indicating its excellent environmental safety. This work not only sheds light on the active role of high-iron components in alkali-activated systems but also provides valuable insights into the sustainable utilization of CS in green construction materials.
{"title":"Sustainable iron-rich copper slag-based alkali-activated binder: Hydration mechanism involving iron phase transformation, mechanical performance, and environmental safety","authors":"Dan Luo, Weihong Mu, Zhongqiu Luo, Xiunan Cai, Pingyan Wang, Wei Wang, Wenjuan Luo, Xintao Zhou","doi":"10.1016/j.cemconcomp.2026.106519","DOIUrl":"https://doi.org/10.1016/j.cemconcomp.2026.106519","url":null,"abstract":"Iron-rich copper slag (CS) has significant potential as a precursor to synthesize an eco-friendly alkali-activated binder (AAB). However, the cooperative participation of multiple elements in CS, such as Si, Al, Ca and Fe (especially the role of Fe), and the activation reaction kinetics lack a clear mechanistic understanding, hindering its large-scale applications in AAB. Herein, the alkali-activation conditions of CS were optimized, and the hydration mechanism and kinetics, mechanical performance, and environmental safety of CS-based alkali-activated binder (CS-AAB) were systematically evaluated. Under the optimized condition, the binder achieved remarkable compressive strengths of 56.7, 69.7, and 73.0 MPa at 3, 7, and 28 d, respectively. The characterization results and hydration kinetic analysis indicated the formation of calcium aluminosilicates (C-A-S-H, Ca<ce:inf loc=\"post\">2</ce:inf>Al<ce:inf loc=\"post\">4</ce:inf>Si<ce:inf loc=\"post\">8</ce:inf>O<ce:inf loc=\"post\">24</ce:inf>·7H<ce:inf loc=\"post\">2</ce:inf>O and CaAl<ce:inf loc=\"post\">2</ce:inf>Si<ce:inf loc=\"post\">4</ce:inf>O<ce:inf loc=\"post\">12</ce:inf>·4H<ce:inf loc=\"post\">2</ce:inf>O), iron hydroxides (Fe(OH)<ce:inf loc=\"post\">3</ce:inf> and FeOOH) as the hydration products. XPS and Mössbauer spectroscopy analyses demonstrated that approximately 17.1% of the iron phases (6.6% from fayalite and 10.5% from ferrosilite) participated in the hydration. The dissolved Fe<ce:sup loc=\"post\">2+</ce:sup> was oxidized into Fe<ce:sup loc=\"post\">3+</ce:sup>, simultaneously coprecipitating with OH<ce:sup loc=\"post\">-</ce:sup> and incorporating into the C-A-S-H network as distorted octahedral and/or five-coordinated configurations. These findings highlight that the modifications to iron phases directly contribute to the material’s mechanical performance. Additionally, leaching tests confirmed that the heavy metals released from the CS-AAB were far below the limits specified in GB-5085.3–2007, indicating its excellent environmental safety. This work not only sheds light on the active role of high-iron components in alkali-activated systems but also provides valuable insights into the sustainable utilization of CS in green construction materials.","PeriodicalId":519419,"journal":{"name":"Cement and Concrete Composites","volume":"51 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2026-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146146576","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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