Cement & concrete composites最新文献_第3页

Fiber–textile hybrid reinforcement on pseudo-ductile behavior of ultra-high-performance concrete 纤维-纺织品混合配筋对高性能混凝土伪延性的影响

IF 13.1 1区工程技术

Cement & concrete composites Pub Date : 2026-04-01 Epub Date: 2026-01-18 DOI: 10.1016/j.cemconcomp.2026.106484

Hyun-Soo Youm, Jang-Woon Baek, Young Hak Lee, Dae-Jin Kim

{"title":"Fiber–textile hybrid reinforcement on pseudo-ductile behavior of ultra-high-performance concrete","authors":"Hyun-Soo Youm, Jang-Woon Baek, Young Hak Lee, Dae-Jin Kim","doi":"10.1016/j.cemconcomp.2026.106484","DOIUrl":"10.1016/j.cemconcomp.2026.106484","url":null,"abstract":"<div><div>Textile-reinforced ultra-high-performance concrete (TR-UHPC) offers great potential for thin-walled structures that meet both serviceability and structural demands. However, the engineering of fiber–textile hybrid reinforcement to simultaneously enhance the strength and pseudo-ductility has rarely been explored. This study reports on uniaxial tensile tests of 60 TR-UHPC tie specimens reinforced with varying amounts of steel fibers (0 %, 1 %, or 2 % by volume) and textile fabrics (0, 1, or 2 layers of carbon or AR-glass textiles). Key mechanical properties, including the crack spacing, cracking stress, tensile strength, strain capacity, and strain energy density (g-value), were examined to assess the overall composite efficiency. Most test results agreed with the expectations based on domain knowledge and complementary material/interface characterizations. However, incorporating short fibers beyond an optimal dosage unexpectedly reduced the ductility, thereby offsetting composite efficiency. A simple theoretical analysis linking crack spacing and strain capacity attributed the reduced ductility to premature damage localization at a single crack, initiated by local deficiencies in short fiber spatial features. These findings offer practical implications for optimizing reinforcement hybridization and advance the development of low-carbon, high-performance building materials.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"168 ","pages":"Article 106484"},"PeriodicalIF":13.1,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145995046","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

Synergistic effects of triethanolamine and nano-SiO2 on the hydration and hardening properties of Limestone calcined clay cement 三乙醇胺和纳米sio2对石灰石煅烧粘土水泥水化硬化性能的协同作用

IF 13.1 1区工程技术

Cement & concrete composites Pub Date : 2026-04-01 Epub Date: 2026-01-21 DOI: 10.1016/j.cemconcomp.2026.106492

Mingqing Liu , Zhonghao Niu , Xiangming Zhou , Pengkun Hou , Ran Hai , Shuang Liang , Yuzhou Sun

{"title":"Synergistic effects of triethanolamine and nano-SiO2 on the hydration and hardening properties of Limestone calcined clay cement","authors":"Mingqing Liu , Zhonghao Niu , Xiangming Zhou , Pengkun Hou , Ran Hai , Shuang Liang , Yuzhou Sun","doi":"10.1016/j.cemconcomp.2026.106492","DOIUrl":"10.1016/j.cemconcomp.2026.106492","url":null,"abstract":"<div><div>This study investigates the synergistic effects of triethanolamine (TEA) and nano-SiO<sub>2</sub> (NS) on the hydration, mechanical properties and microstructure of Limestone Calcined Clay Cement (LC<sup>3</sup>). Isothermal calorimetry results reveal that NS primarily enhances the hydration degree of the silicate phase, whereas TEA preferentially accelerates aluminate hydration through Al<sup>3+</sup> complexation and surface adsorption, which modifies ion availability and delays C-S-H nucleation, thereby regulating the timing of the silicate peak. Both NS and TEA can increase the intensity of the aluminate peak, while their combination produces an even stronger synergistic effect. TEA consistently contributes to LC<sup>3</sup> strength development at all ages, while NS mainly improves early-age strength. The synergistic effect of NS and TEA is more pronounced than either additive alone, with the LC<sup>3</sup>-3NS-0.2 %TEA (with 3 % NS and 0.2 % TEA) blend exhibiting the best performance across all ages. TEA leads to a greater consumption of CH compared to NS, while NS-TEA blends yield a higher volume of hydrates, including C-(A)-S-H gel, AFm, and AFt phases. Moreover, TEA primarily influences pore size distribution rather than total porosity, shifting larger, more harmful pores into smaller, less detrimental ones. The NS-TEA synergistic blend achieves the most favourable pore structure, characterised by the lowest content of harmful pores (>100 nm) and the highest proportion of fine pores (4.5–50 nm and <4.5 nm).</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"168 ","pages":"Article 106492"},"PeriodicalIF":13.1,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146014918","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

Mechanical and adhesive properties of alkali-activated fly ash (AAF) and alkali-activated slag (AAS) at the nano- and micro-scales 碱活性粉煤灰（AAF）和碱活性渣（AAS）在纳米和微尺度上的力学性能和粘接性能

IF 13.1 1区工程技术

Cement & concrete composites Pub Date : 2026-04-01 Epub Date: 2026-01-13 DOI: 10.1016/j.cemconcomp.2026.106483

Kongfa Zhu , Hongliang Zhang , Yujiao Zhu , Qihan Zhong , Demei Yu

{"title":"Mechanical and adhesive properties of alkali-activated fly ash (AAF) and alkali-activated slag (AAS) at the nano- and micro-scales","authors":"Kongfa Zhu , Hongliang Zhang , Yujiao Zhu , Qihan Zhong , Demei Yu","doi":"10.1016/j.cemconcomp.2026.106483","DOIUrl":"10.1016/j.cemconcomp.2026.106483","url":null,"abstract":"<div><div>The adhesive and nanomechanical properties of alkali-activated materials (AAMs) remain poorly understood, despite being crucial for explaining their macroscopic mechanical and deformation behaviors. Here, Atomic force microscopy-quantitative nanomechanical mapping (AFM-QNM) was utilized to characterize the mechanical and adhesive properties of alkali-activated fly-ash (AAF) and alkali-activated slag (AAS) across multiple scanning scales (50 μm–500 nm). The moduli and adhesion of distinct sub-constituents were deconvoluted at different scales and the relationships between the nanoscale mechanical and adhesive characteristics of basic building blocks and the properties of gel clusters and reaction products were established to reveal the origin of these properties. Comparisons of the differences in composition, nanomechanical and adhesive characteristics between N-A-S-H and C-A-S-H basic building blocks elucidate how these differences influence the properties of gel clusters and reaction products. The results indicate that for AAF, grain comprises wrinkled peak and valley regions. Peak zones dominate grain-level mechanics and adhesion, while valleys modulate these properties. This nanoscale relationship extends to higher scales. The properties of N-A-S-H gel clusters and reaction products are largely inherited from the peak regions. In AAS, a distinct intermediate “unit-cell” structure, formed by aggregated nanograins, promotes the formation of a high-density phase within C-A-S-H clusters. The mechanical and adhesive properties of the resulting products may originate from these unit cells, with nanograins providing secondary modulation. The presence of unit cell structure accounts for the superior compressive and flexural strength of AAS compared to AAF. These insights inform the hierarchical modeling and targeted design of AAMs.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"168 ","pages":"Article 106483"},"PeriodicalIF":13.1,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145955314","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

5-1-7 phase regulation and performance enhancement of magnesium oxysulfate cement: Research progress and engineering perspectives 硫酸镁水泥的物相调控与性能提升：研究进展与工程展望

IF 13.1 1区工程技术

Cement & concrete composites Pub Date : 2026-04-01 Epub Date: 2026-01-21 DOI: 10.1016/j.cemconcomp.2026.106495

Yanling Guo , Bin Li , Xiangrui Meng , Zhenzhen Liu , Yao Xiao , Bing Chen

{"title":"5-1-7 phase regulation and performance enhancement of magnesium oxysulfate cement: Research progress and engineering perspectives","authors":"Yanling Guo , Bin Li , Xiangrui Meng , Zhenzhen Liu , Yao Xiao , Bing Chen","doi":"10.1016/j.cemconcomp.2026.106495","DOIUrl":"10.1016/j.cemconcomp.2026.106495","url":null,"abstract":"<div><div>Magnesium oxysulfate cement (MOSC), as a green cementitious material, has gradually attracted widespread attention. Its advantages mainly stem from low carbon emissions, excellent high-temperature resistance, and lightweight properties. However, the performance of MOSC fundamentally depends on the formation and stability of a specific crystalline phase, especially the 5-1-7 phase (5Mg(OH)<sub>2</sub>·MgSO<sub>4</sub>·7H<sub>2</sub>O). This key crystalline phase not only determines the material's mechanical properties but is also crucial for improving its insufficient water resistance and optimizing its functional applications. However, few reviews systematically summarize the application of the 5-1-7 phase in this important field of modified MOSC. In this review, we comprehensively summarize the research progress on the hydration process and representative crystal structures of MOSC in the MgO–MgSO<sub>4</sub>–H<sub>2</sub>O system, focusing on the formation mechanism of the 5-1-7 phase and exploring its significant impact on the mechanical strength, high-temperature resistance, and lightweight applications of MOSC. This paper also systematically reviews existing modification strategies, with a particular focus on analyzing the mechanisms by which admixtures and fillers affect the formation of the 5-1-7 phase and improve the overall material properties. Furthermore, we summarize the application progress of MOSC across multiple engineering scenarios and systematically evaluate the pivotal role of 5-1-7 phase regulation in engineering applications. Finally, this paper identifies key scientific issues that urgently need to be addressed in current research and proposes future research directions, providing necessary theoretical support for accelerating its application in the engineering field.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"168 ","pages":"Article 106495"},"PeriodicalIF":13.1,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146014913","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

Microstructural evolution of limestone calcined clay cement (LC3) paste: Insights from hydration to drying using 1H-NMR relaxometry 石灰石煅烧粘土水泥（LC3）膏体的微观结构演化：利用1H-NMR弛豫仪从水化到干燥的见解

IF 13.1 1区工程技术

Cement & concrete composites Pub Date : 2026-04-01 Epub Date: 2026-01-22 DOI: 10.1016/j.cemconcomp.2026.106496

Zhenli Yang, Luge Cheng, Ryo Kurihara, Ippei Maruyama

{"title":"Microstructural evolution of limestone calcined clay cement (LC3) paste: Insights from hydration to drying using 1H-NMR relaxometry","authors":"Zhenli Yang, Luge Cheng, Ryo Kurihara, Ippei Maruyama","doi":"10.1016/j.cemconcomp.2026.106496","DOIUrl":"10.1016/j.cemconcomp.2026.106496","url":null,"abstract":"<div><div>Understanding the microstructure change during drying in limestone calcined clay cement (LC<span><math><msup><mrow></mrow><mrow><mn>3</mn></mrow></msup></math></span>) is crucial for promoting low-clinker cementitious materials and reducing the environmental impact of cement production. Building on microstructural change during hydration, this study investigates the pore structure and phase change in LC<span><math><msup><mrow></mrow><mrow><mn>3</mn></mrow></msup></math></span> and its influence on macroscopic shrinkage. Composition analysis of the hydrates was conducted using X-ray diffraction and energy-dispersive X-ray spectroscopy. Additionally, proton nuclear magnetic resonance relaxometry was used to determine pore structure. Microscopically, the reacted metakaolin residues yield NMR signals that fall within the same <span><math><msub><mrow><mi>T</mi></mrow><mrow><mn>2</mn></mrow></msub></math></span> range as those typically assigned to interhydrate pores within calcium alumino-silicate hydrate (C–A–S–H), yet they originate from different structural domains. The low Ca/(Al+Si) ratio in LC<span><math><msup><mrow></mrow><mrow><mn>3</mn></mrow></msup></math></span> results in sparsely packed C–A–S–H with interlayer spaces that remain structurally stable and retain water strongly during drying, showing little change even under low relative humidity. During drying, water is mainly held in and released from gel, interhydrate, and capillary pores. LC<span><math><msup><mrow></mrow><mrow><mn>3</mn></mrow></msup></math></span> exhibits significantly lower shrinkage than OPC, which is attributed, based on the C–A–S–H structural model, to its lower Ca concentration and the resulting interlayer structure that remains stable and water-retentive at low humidity.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"168 ","pages":"Article 106496"},"PeriodicalIF":13.1,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146021817","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

Utilization of electric arc furnace reducing slag as a cement alternative in ultra-high-performance fiber-reinforced concrete: insights into mechanical performance enhancement 电弧炉还原渣在高性能纤维增强混凝土中作为水泥替代品的应用：提高力学性能的见解

IF 13.1 1区工程技术

Cement & concrete composites Pub Date : 2026-04-01 DOI: 10.1016/j.cemconcomp.2026.106604

Zhengri Cui , Qingbo Ning , Taekgeun Oh , Keat Bin Teoh , Nemkumar Banthia , Doo-Yeol Yoo

{"title":"Utilization of electric arc furnace reducing slag as a cement alternative in ultra-high-performance fiber-reinforced concrete: insights into mechanical performance enhancement","authors":"Zhengri Cui , Qingbo Ning , Taekgeun Oh , Keat Bin Teoh , Nemkumar Banthia , Doo-Yeol Yoo","doi":"10.1016/j.cemconcomp.2026.106604","DOIUrl":"10.1016/j.cemconcomp.2026.106604","url":null,"abstract":"<div><div>This study investigated the mechanical and microstructural properties of ultra-high-performance fiber-reinforced concrete (UHPFRC) incorporating electric arc furnace reducing slag (ERS) as a partial replacement for ordinary Portland cement (OPC). A comprehensive experimental program included compressive and direct tensile tests, single-fiber pullout tests, microstructural and μ-CT fiber-orientation analyses, and digital image correlation for microcrack evaluation. Partial substitution of OPC with ERS enhanced matrix densification and fiber–matrix interfacial properties, yielding superior mechanical behavior. Optimum performance occurred at a 10% replacement level (E10): the compressive strength reached 201.6 MPa—approximately 12% higher than the control (179.1 MPa). The equivalent bond strength of steel fibers increased to 19.94 MPa (31% higher), and the maximum surface roughness reached 110.3 nm, more than twice that of the control, indicating improved frictional resistance. The E10 mixture also exhibited a tensile strength of 17.1 MPa, strain capacity of 0.79%, and strain energy density of 113.8 kJ/m<sup>3</sup>, corresponding to increases of 22%, 39%, and 69%, respectively. E10 developed the largest number of fine cracks with a reduced maximum width of 56.5 μm, safely below the 100 μm durability threshold. Improvements are attributed to synergistic effects of enhanced C–S–H formation, matrix densification, and fiber alignment. Overall, ERS is a promising supplementary cementitious material for sustainable UHPFRC. Beyond 10% ERS, compressive strength gradually declined, and mixtures containing 25% or more fell below the control, reflecting a trade-off between beneficial C–S–H gel formation at low dosages and pH reduction driven by MgO at higher contents.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"171 ","pages":"Article 106604"},"PeriodicalIF":13.1,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147584884","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

CO2-induced rheological response of cement paste driven by the evolution of interparticle interactions 颗粒间相互作用演化驱动的co2诱导水泥浆体流变响应

IF 13.1 1区工程技术

Cement & concrete composites Pub Date : 2026-04-01 Epub Date: 2026-01-20 DOI: 10.1016/j.cemconcomp.2026.106486

Chunjin Li , Xiaodi Dai , Zhiyuan Liu , Xianqing Xia , Qiang Ren , Zhengwu Jiang

{"title":"CO2-induced rheological response of cement paste driven by the evolution of interparticle interactions","authors":"Chunjin Li , Xiaodi Dai , Zhiyuan Liu , Xianqing Xia , Qiang Ren , Zhengwu Jiang","doi":"10.1016/j.cemconcomp.2026.106486","DOIUrl":"10.1016/j.cemconcomp.2026.106486","url":null,"abstract":"<div><div>Growing interest in CO<sub>2</sub> injection during mixing stems from its coupled impacts on early-age properties and CO<sub>2</sub> uptake. Here we elucidate the rheological response by quantifying how interparticle interactions govern this effect. We combined rheological measurements with zeta potential analysis, atomic force microscopy (AFM) pull-off force mapping, inductively coupled plasma optical emission spectrometry (ICP-OES) and pH characterization of pore solution, thermogravimetric analysis (TGA), transmission electron microscopy (TEM), low-field proton nuclear magnetic resonance (<sup>1</sup>H NMR), and interparticle-force simulations using Hamaker 2.2. Results show that CO<sub>2</sub> injection decreases particle zeta potential by 22.5 %–64.7 % via carbonate precipitation and ionic enrichment, weakening electrostatic repulsion while strengthening van der Waals attraction and promoting carbonate bridging. Consequently, a rigid flocculated network forms, raising yield stress (∼41.3 % under pure CO<sub>2</sub> injection) and apparent viscosity. Under shear, the reduced energy barrier facilitates bond rupture and agglomerate breakdown, resulting in lower plastic viscosity. In parallel, early hydration is retarded, slowing structural build-up, illustrating 37.5 % reduction in storage modulus. These findings establish a mechanistic link between early-age carbonation, interparticle forces, and macroscopic rheology, and provide guidance for optimizing CO<sub>2</sub> injection to balance flowability and CO<sub>2</sub> uptake in low-carbon cementitious materials.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"168 ","pages":"Article 106486"},"PeriodicalIF":13.1,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146005729","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

Utilizing aerogel to tailor flaws for lightweighting, toughness improvement, and cracking pattern transition of ultra-high toughness cementitious composite 利用气凝胶为超高韧性胶凝复合材料的轻量化、韧性改善和裂纹模式转变量身定制缺陷

IF 13.1 1区工程技术

Cement & concrete composites Pub Date : 2026-04-01 Epub Date: 2026-01-07 DOI: 10.1016/j.cemconcomp.2026.106472

Shilang Xu, Zizhuo Su, Qinghua Li, Xing Yin, Zixiang Shen, Qingmin Wang

{"title":"Utilizing aerogel to tailor flaws for lightweighting, toughness improvement, and cracking pattern transition of ultra-high toughness cementitious composite","authors":"Shilang Xu, Zizhuo Su, Qinghua Li, Xing Yin, Zixiang Shen, Qingmin Wang","doi":"10.1016/j.cemconcomp.2026.106472","DOIUrl":"10.1016/j.cemconcomp.2026.106472","url":null,"abstract":"<div><div>A novel lightweight ultra-high-toughness cementitious composite (LW-UHTCC) was developed by incorporating silica aerogel and polyethylene (PE) fibers into a tailored cementitious matrix. The matrix was designed based on micromechanical and fracture mechanics principles to achieve moderate fracture toughness, enabling an optimal balance of fiber-matrix bridging strength, which facilitates strain-hardening and multiple microcracking. Toughening mechanisms were investigated by quantifying matrix fracture toughness and fiber bridging performance using three-point bending and single-crack tensile tests, respectively. The addition of highly porous silica aerogel significantly reduced the composite density (from 2235 to 1624 kg/m<sup>3</sup>), while PE fibers contributed to strong crack-bridging, synergistically enhancing both tensile ductility and energy dissipation. Mercury intrusion porosimetry (MIP) revealed that the aerogel-modified matrix exhibited a refined, multiscale pore structure. Direct tensile tests exhibited robust strain-hardening behavior, marked by the formation of multiple cracking and over-saturation phenomenon, accompanied by stress fluctuation signifying stable crack growth. The inclusion of aerogel not only reduces the density of UHTCC but also shifts the cracking pattern from saturated to over-saturated cracking, significantly enhancing its toughness under both tensile and compressive stresses. The developed LW-UHTCC achieved an excellent combination of low density, high energy absorption, and superior tensile performance, with tensile strain capacities of 5.1–6.8 %, tensile strengths up to 8.5 MPa, and compressive strengths ranging from 66.5 to 124.1 MPa. These attributes make LW-UHTCC a potential candidate for lightweight, high-ductility structural components and resilient infrastructure systems.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"168 ","pages":"Article 106472"},"PeriodicalIF":13.1,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145949857","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

Improved corrosion resistance of steel in mortar incorporating molybdate-loaded HNTs: Microstructural refinement and protective film formation 加入钼酸盐负载HNTs的砂浆中提高钢的耐腐蚀性：微观结构的细化和保护膜的形成

IF 13.1 1区工程技术

Cement & concrete composites Pub Date : 2026-04-01 Epub Date: 2026-01-17 DOI: 10.1016/j.cemconcomp.2026.106491

Yongqi Liu , Jinjie Shi

{"title":"Improved corrosion resistance of steel in mortar incorporating molybdate-loaded HNTs: Microstructural refinement and protective film formation","authors":"Yongqi Liu , Jinjie Shi","doi":"10.1016/j.cemconcomp.2026.106491","DOIUrl":"10.1016/j.cemconcomp.2026.106491","url":null,"abstract":"<div><div>To mitigate the adverse impacts of traditional corrosion inhibitors on concrete performance, recent research has focused on using nano-containers for encapsulating inhibitors. However, previous studies have primarily utilized simulated concrete pore solutions, without adequately addressing the effects of nano-containers on the concrete matrix or the actual service environment on inhibitor efficiency. To bridge these gaps, this study aims to explore the feasibility and applicability of halloysite nanotubes (HNTs), as the nano-containers for encapsulating molybdate ions, to enhance the corrosion resistance of steel embedded in mortar. Accordingly, a molybdate-loaded halloysite nanotube (HNT@MO) was successfully synthesized and incorporated into mortar. The results revealed that the release of molybdate ions from HNTs could promote the formation of a protective oxide film on the steel surface and suppress the corrosion process caused by chloride attack. In addition, the incorporation of HNT@MO enhanced the mechanical properties of mortar by refining microstructure and reducing porosity. Accordingly, this synergistic inhibition effect of HNT@MO improved the corrosion resistance of steel in mortar against chloride-induced corrosion.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"168 ","pages":"Article 106491"},"PeriodicalIF":13.1,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145995047","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

The coupling effect of viscosity modifying agents and printing process on the air-void structure formation of 3D printed air-entrained concrete 黏度改性剂与打印工艺对3D打印掺气混凝土气孔结构形成的耦合效应

IF 13.1 1区工程技术

Cement & concrete composites Pub Date : 2026-04-01 Epub Date: 2026-01-23 DOI: 10.1016/j.cemconcomp.2026.106497

Yuyang Kang , Cheng Yu , Zedi Zhang , Lutao Jia , Xianggang Wang , Nemkumar Banthia , Yamei Zhang , Zijian Jia

{"title":"The coupling effect of viscosity modifying agents and printing process on the air-void structure formation of 3D printed air-entrained concrete","authors":"Yuyang Kang , Cheng Yu , Zedi Zhang , Lutao Jia , Xianggang Wang , Nemkumar Banthia , Yamei Zhang , Zijian Jia","doi":"10.1016/j.cemconcomp.2026.106497","DOIUrl":"10.1016/j.cemconcomp.2026.106497","url":null,"abstract":"<div><div>3D printed concrete (3DPC) holds significant potential for applications in extreme environments. Air-entraining agents (AEAs) can enhance the frost resistance of concrete in cold regions by introducing uniformly distributed small air-voids. However, in 3DPC, the use of viscosity-modifying agents (VMAs) and the unique printing process may adversely affect the characteristics of entrained air-voids. This study employs X-ray computed tomography (X-CT) to quantitatively characterize the evolution of air-void structures in AEA-modified 3DPC containing different VMAs across three critical manufacturing stages: before-printing, in-printing-nozzle and after-printing. The results reveal that the shear action of the screw rod effectively refines the air-void size distribution while increasing overall air-void volume fraction. Hydroxypropyl methyl cellulose (HPMC) effectively stabilizes small bubbles (<500 μm) during before-printing stage, increasing the air-voids count via a protective film that prevents rupture. Conversely, attapulgite leaves small bubbles vulnerable to break. However, during in-printing-nozzle and after-printing stage, attapulgite better protects large bubbles (>1000 μm), maintaining their shape against shear and elongation forces with a stable shell, while HPMC offers little protection, leading to more significant elongated bubble shapes. This study provides an experimental basis for regulating air-void structure in 3D printed air-entrained concrete from the perspective of materials selection and printing processes control.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"168 ","pages":"Article 106497"},"PeriodicalIF":13.1,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146033313","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}

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