Cement & concrete composites最新文献_第7页

Cement-based mechanical metamaterials with spiral resonators for vibration control 具有螺旋谐振器的水泥基机械超材料的振动控制

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2025-06-16 DOI: 10.1016/j.cemconcomp.2025.106191

Koichi Imagawa , Motohiro Ohno , Yoichiro Koga , Tetsuya Ishida

{"title":"Cement-based mechanical metamaterials with spiral resonators for vibration control","authors":"Koichi Imagawa , Motohiro Ohno , Yoichiro Koga , Tetsuya Ishida","doi":"10.1016/j.cemconcomp.2025.106191","DOIUrl":"10.1016/j.cemconcomp.2025.106191","url":null,"abstract":"<div><div>This paper presents a single-phase cement-based mechanical metamaterial for vibration control. The unit cell consists of a cement-based matrix with tailored spiral slits, functioning as an embedded spring-mass system. The local resonance of the spiral resonators generates a band gap within a specific frequency range, in which input vibration energy is effectively absorbed. Both experimental and analytical investigations were conducted to demonstrate the feasibility of this cement-based metamaterial. First, the frequency response under sinusoidal excitation was evaluated using finite element analysis. The simulation results indicated that a metamaterial plate consisting of three unit cells exhibits a distinct band gap ranging from 46 Hz to 62 Hz. To validate this unique behavior, specimens were prepared using fiber reinforced cement mortar, and their transmissibility was measured by sine sweep testing. The experimental results confirmed a band gap ranging from 21 Hz to 50 Hz. Furthermore, significant anti-resonant vibration in the spiral resonators was observed during testing. Following this feasibility study, strategies for adjusting the band gap range by tailoring the internal structure were explored. Analytical modeling and numerical simulations suggest that tailoring the unit cell design alone involves a trade-off between achieving a low-frequency band gap and widening the band gap width. However, by employing different unit cell designs and optimizing their arrangement within the structure, it is possible to widen the band gap while maintaining its position. Such non-periodic metamaterial designs offer greater flexibility for tuning band gaps, enabling more versatile applications.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"163 ","pages":"Article 106191"},"PeriodicalIF":10.8,"publicationDate":"2025-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144296311","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

Effects of highly dispersed LDH nano-platelets on chloride binding and corrosion protection of cementitious materials 高度分散的LDH纳米片对胶凝材料氯离子结合和防腐的影响

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2025-06-15 DOI: 10.1016/j.cemconcomp.2025.106178

Qinglu Yu , Xing Ming , Yueyang Wang , Long Sun , Mingkai Cui , Guoxing Sun

{"title":"Effects of highly dispersed LDH nano-platelets on chloride binding and corrosion protection of cementitious materials","authors":"Qinglu Yu , Xing Ming , Yueyang Wang , Long Sun , Mingkai Cui , Guoxing Sun","doi":"10.1016/j.cemconcomp.2025.106178","DOIUrl":"10.1016/j.cemconcomp.2025.106178","url":null,"abstract":"<div><div>The chemical binding of free chloride ions in cementitious materials, crucial for prolonging their lifespan, relies heavily on aluminate hydrates and can be modulated by incorporating the layered double hydroxides (LDHs). Yet, the currently synthesized LDHs in field of cement and concrete usually suffer from nano crystallites aggregation, limiting their potential as nanofillers and hindering the chloride-capturing efficiency. This study compares the cementitious materials containing highly dispersed LDH nano-platelets (HDLNPs) with those using conventional LDH powder (LP) to unveil the ion-exchange-efficiency-dependent aluminates regulation and particle-size-related pores refinement of LDHs. HDLNPs regulate the sulfate to aluminate balance at a concurrent rate with early-age hydration of tricalcium aluminate (C<sub>3</sub>A) to promote the conversion from ettringite (AFt) to alumino-ferrite-mono (AFm) phases. Furthermore, due to their high dispersion, HDLNPs mitigate the interlayer inertness toward chloride binding induced by carbonation. However, HDLNPs primarily occupy micropores around outer C-S-H, failing to refine capillary pore, which is amplified by the concomitant AFt shortage, leads to higher capillary adsorption rates. Nevertheless, HDLNPs outperform LP in terms of corrosion protection at equivalent dosage, evoking the LDHs’ unsung ion-exchange capacity in delaying chloride ingress. This advancement in the dispersion of incorporated LDHs underscores their valuable roles in designing durable and sustainable cementitious materials.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"163 ","pages":"Article 106178"},"PeriodicalIF":10.8,"publicationDate":"2025-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144290009","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

Anisotropic flexural behavior and energy absorption of 3D printed engineered cementitious composites (3DP-ECC) beams under low-velocity impact 低速冲击下3D打印工程胶凝复合材料（3D - ecc）梁的各向异性弯曲行为和能量吸收

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2025-06-14 DOI: 10.1016/j.cemconcomp.2025.106183

Huzi Ye , Qianpeng He , Pengxin Ping , Jinlong Pan , Binrong Zhu

{"title":"Anisotropic flexural behavior and energy absorption of 3D printed engineered cementitious composites (3DP-ECC) beams under low-velocity impact","authors":"Huzi Ye , Qianpeng He , Pengxin Ping , Jinlong Pan , Binrong Zhu","doi":"10.1016/j.cemconcomp.2025.106183","DOIUrl":"10.1016/j.cemconcomp.2025.106183","url":null,"abstract":"<div><div>This study systematically investigates the mechanical behavior and energy absorption properties of anisotropic 3D-printed engineered cementitious composite (3DP-ECC) beams under low-velocity impact, with a focus on performance variations across different loading directions. A comprehensive experimental program, including quasi-static compression, tensile, three-point flexural, and low-velocity impact tests, was conducted to evaluate the mechanical response and failure mechanisms of 3DP-ECC in the U, V, and W loading directions. The results demonstrate that 3DP-ECC exhibits significant anisotropy compared to Cast-ECC. Specifically, the W-direction exhibited a 33.4 % increase in flexural strength, along with enhanced energy absorption capacity, improved toughness, and reduced strain-rate sensitivity. Additionally, a novel methodology for calculating inertial forces and a predictive model for energy absorption were developed, categorizing impact energy into components associated with matrix fracture, fiber-matrix interactions, and inertial effects. The findings indicate that 3DP-ECC in the W-direction offers optimal impact resistance, while the U-direction exhibits the highest inertial force and acceleration, which may pose risks to structural integrity. This research offers valuable insights into the optimization and application of 3DP-ECC in impact-resistant infrastructure.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"163 ","pages":"Article 106183"},"PeriodicalIF":10.8,"publicationDate":"2025-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144290076","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

Chloride induced corrosion behavior of carbon steel rebar in seawater mixed Portland cement-SF-MK ternary pastes with low w/b ratio 低w/b比硅酸盐水泥- sf - mk海水混合体中碳钢钢筋的氯致腐蚀行为

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2025-06-13 DOI: 10.1016/j.cemconcomp.2025.106182

Yifan Zhao , Xiang Hu , Xiao-Ling Zhao , Gaozhan Zhang , Caijun Shi

{"title":"Chloride induced corrosion behavior of carbon steel rebar in seawater mixed Portland cement-SF-MK ternary pastes with low w/b ratio","authors":"Yifan Zhao , Xiang Hu , Xiao-Ling Zhao , Gaozhan Zhang , Caijun Shi","doi":"10.1016/j.cemconcomp.2025.106182","DOIUrl":"10.1016/j.cemconcomp.2025.106182","url":null,"abstract":"<div><div>Utilizing seawater in the formulation of ultra-high-performance concrete (UHPC) presents promising opportunities in marine civil engineering. This study investigates the chloride-induced corrosion behavior of carbon steel within seawater-mixed Portland cement-SF-MK ternary pastes with a low water-to-binder ratio, through electrochemical measurements. The findings reveal that the incorporation of supplementary cementitious materials (SCMs) such as SF (Silica Fume) and MK (Metakaolin), at appropriate replacement levels, significantly enhances the chloride binding capacity. This improvement stems from the pozzolanic reaction and the formation of Friedel's salt. The corrosion of steel is effectively mitigated by partially substituting cement with SF or MK, attributed to the reduction in oxygen diffusion and the concentration of free chlorides in the pore solution. This enhancement in corrosion resistance is further bolstered by the refinement of the microstructure and the increased chloride binding capacity. However, the effectiveness of corrosion mitigation is found to be dependent on the composition of the binder. Regardless of whether it's a binary or ternary system, steel corrosion exacerbates as the total replacement level of SF and MK reaches 30 %, primarily due to the consumption of portlandite. Therefore, the judicious selection of SF and MK replacement levels is crucial. Optimally, SF and MK replacement levels of around 10 % are recommended to improve the resistivity (R<sub>1</sub>) of the paste, increase the impedance (R<sub>2</sub>) of the passivation film or corrosion products, and enhance the charge transfer impedance (R<sub>3</sub>) of the steel significantly. This inhibits the redox reaction of steel in seawater-mixed Portland cement-SF-MK ternary pastes with low water-to-binder ratio.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"163 ","pages":"Article 106182"},"PeriodicalIF":10.8,"publicationDate":"2025-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144288335","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 CO2 partial pressure and temperature on degradation kinetics of cement paste in CO2-rich water CO2分压和温度对富CO2水中水泥浆体降解动力学的影响

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2025-06-12 DOI: 10.1016/j.cemconcomp.2025.106185

Shuqing Zhang , Jianhui Liu , Leping Liu , Zheng Chen , Caijun Shi

{"title":"Effect of CO2 partial pressure and temperature on degradation kinetics of cement paste in CO2-rich water","authors":"Shuqing Zhang , Jianhui Liu , Leping Liu , Zheng Chen , Caijun Shi","doi":"10.1016/j.cemconcomp.2025.106185","DOIUrl":"10.1016/j.cemconcomp.2025.106185","url":null,"abstract":"<div><div>In karst areas, the groundwater typically exhibits high levels of carbon dioxide (CO<sub>2</sub>-rich water), which leads to the calcium leaching of underground concrete structures. The deterioration of concrete cover can cause the corrosion of the steel bars, resulting in a serious threat to the durability of the structures. In this paper, the degradation behaviors and microstructure development of cement paste under different CO<sub>2</sub> partial pressures (0.1, 0.4, 0.8 MPa) and temperatures (5 °C, 25 °C, 50 °C) of CO<sub>2</sub>-rich water were studied, and the degradation kinetics were discussed. The results indicate that the reaction of the cement paste is prone to occur in CO<sub>2</sub>-rich water, with an activation energy of 6.46 kJ/mol. The degradation process results from the combined effects of carbonation and calcium leaching. Both increased CO<sub>2</sub> partial pressure and temperature accelerate degradation, however, and the sensitivity of temperature is significantly higher than pressure. Based on this, we establish a prediction model of degradation depth, which is applied to the cement paste with intact degradation layer in low flow rate of CO<sub>2</sub>-rich water.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"163 ","pages":"Article 106185"},"PeriodicalIF":10.8,"publicationDate":"2025-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144268861","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

Mesoscale degradation of interface transition zone in recycled aggregate concrete under multi-ion attack: Role of cementitious composites and microhardness-geometric evolution 多离子侵蚀下再生骨料混凝土界面过渡区的中尺度降解：胶凝复合材料和显微硬度-几何演化的作用

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2025-06-12 DOI: 10.1016/j.cemconcomp.2025.106176

Jiabin Wang , Huiyang Han , Yijie Fan , Bin Wang , Xiao Guan

{"title":"Mesoscale degradation of interface transition zone in recycled aggregate concrete under multi-ion attack: Role of cementitious composites and microhardness-geometric evolution","authors":"Jiabin Wang , Huiyang Han , Yijie Fan , Bin Wang , Xiao Guan","doi":"10.1016/j.cemconcomp.2025.106176","DOIUrl":"10.1016/j.cemconcomp.2025.106176","url":null,"abstract":"<div><div>This study investigates the microhardness and geometric degradation mechanisms of interfacial transition zones (ITZs) in recycled aggregate concrete (RAC) exposed to saline soil attack, focusing on the influence of supplementary cementitious materials (SCMs). Ten RAC mixtures incorporating fly ash (FA), granulated blast furnace slag (GBFS), silica fume (SF), and metakaolin (MK) at 10 %, 15 %, and 20 % replacement ratios were subjected to 180 dry-wet cycles in a 7.5 %MgSO<sub>4</sub>-7.5 %Na<sub>2</sub>SO<sub>4</sub>-5 %NaCl solution. Key results reveal that ITZ's microhardness and geometric degradation decreases with exposure depth but intensifies with prolonged dry-wet cycles. The FA-GBFS synergistically enhances ITZ microhardness while minimizing geometric deterioration, with ITZ's width and porosity reduced to 67.6–69.0 μm and 25.83 %, respectively. In contrast, FA-SF and FA-MK exacerbate microhardness degradation, increasing porosity and amplifying microcrack coalescence. FA-GBFS mitigates the \"diffusion-leaching” of aggressive/original ions and suppresses the formation of corrosion products, thereby inhibiting the initiation and propagation of microcracks. In contrast, FA-SF and FA-MK promote the formation of ettringite/gypsum and crystallization blöedite/glauberite, which facilitates the formation of \"trunk-limb-twig” cracks.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"163 ","pages":"Article 106176"},"PeriodicalIF":10.8,"publicationDate":"2025-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144269031","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

Self-healing mechanisms in concrete cured in CO2-saturated environments: Synergistic effects of biomass forest ash and metakaolin 饱和co2环境下混凝土的自愈机制：生物质森林灰和偏高岭土的协同效应

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2025-06-11 DOI: 10.1016/j.cemconcomp.2025.106160

B. Cantero , S. Seara-Paz , E. Cuenca , L. Ferrara , B. González-Fonteboa

{"title":"Self-healing mechanisms in concrete cured in CO2-saturated environments: Synergistic effects of biomass forest ash and metakaolin","authors":"B. Cantero , S. Seara-Paz , E. Cuenca , L. Ferrara , B. González-Fonteboa","doi":"10.1016/j.cemconcomp.2025.106160","DOIUrl":"10.1016/j.cemconcomp.2025.106160","url":null,"abstract":"<div><div>This study investigates the effect of autogenous self-healing in high-performance ternary concrete mixes incorporating biomass forest ash when exposed to concentration of carbon dioxide (CO<sub>2</sub>). To analyse this phenomenon, three cementitious systems were studied: i) 100 % Portland cement, ii) 60 % Portland cement, 25 % biomass ash, and 15 % metakaolin, and iii) 60 % Portland cement, 25 % limestone filler, and 15 % metakaolin. The samples, prepared with different initial crack widths, were subjected to four self-healing conditions: i) continuous immersion in tap water (TW), ii) wet-dry cycles in TW, iii) continuous immersion in carbonated water (CW), and iv) wet-dry cycles in CW, over two exposure periods (28 and 90 days). The effectiveness of the process was evaluated through the analysis of surface crack sealing using a digital microscope and the recovery of impermeability through water permeability tests. To understand the chemical mechanisms involved, the self-healing products formed were analysed using SEM. The results showed that the samples self-healed in CW tended to exhibit lower surface sealing efficiency compared to TW, regardless of the mix type, due to the slightly acidic pH caused by the dissolution of CO<sub>2</sub> into carbonic acid. However, in the higher pH inside the cracks promoted the precipitation of calcium carbonates, improving internal impermeability even without achieving effective surface sealing. In this context, biomass ash was particularly effective as a water reservoir, promoting more efficient internal curing when combined with metakaolin and achieving better results in terms of internal impermeability than conventional mixes with cement or limestone filler combined with metakaolin.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"163 ","pages":"Article 106160"},"PeriodicalIF":10.8,"publicationDate":"2025-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144268862","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

New insights on thaumasite precipitation based on thermodynamic modeling and 3-year exposure of cement pastes to Na2SO4 and MgSO4 solutions 基于热力学模型和水泥浆在Na2SO4和MgSO4溶液中曝晒3年的研究对硫马石沉淀的新见解

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2025-06-11 DOI: 10.1016/j.cemconcomp.2025.106190

Shintaro Miyamoto , Yuichiro Kawabata , Natsuki Yoshida , Marcus H.N. Yio , Tsuyoshi Saito , Hong S. Wong

{"title":"New insights on thaumasite precipitation based on thermodynamic modeling and 3-year exposure of cement pastes to Na2SO4 and MgSO4 solutions","authors":"Shintaro Miyamoto , Yuichiro Kawabata , Natsuki Yoshida , Marcus H.N. Yio , Tsuyoshi Saito , Hong S. Wong","doi":"10.1016/j.cemconcomp.2025.106190","DOIUrl":"10.1016/j.cemconcomp.2025.106190","url":null,"abstract":"<div><div>Cement pastes were exposed to 0.10 mol/L Na<sub>2</sub>SO<sub>4</sub> and MgSO<sub>4</sub> solutions at 20 °C for over three years to investigate the precipitation mechanism of thaumasite and the associated phase evolution. Powder X-ray diffraction, thermogravimetric analysis, Fourier-transform infrared spectroscopy, and scanning electron microscopy coupled with energy-dispersive X-ray spectroscopy show that samples exposed to MgSO<sub>4</sub> have lower contents of portlandite, calcite, and C-S-H, compared to those exposed to Na<sub>2</sub>SO<sub>4</sub>. In addition, samples exposed to MgSO<sub>4</sub> contained significant amounts of thaumasite and brucite. Ettringite content is comparable in both conditions, but thaumasite is not detectable in samples exposed to Na<sub>2</sub>SO<sub>4</sub>. This difference can be attributed to the higher degree of supersaturation of thaumasite in samples exposed to MgSO<sub>4</sub> compared to Na<sub>2</sub>SO<sub>4</sub>. Thermodynamic modelling was carried out to validate this hypothesis and the predicted phase assemblages show good consistency with experiments. By introducing a critical supersaturation into the thermodynamic phase equilibrium calculations, the model successfully reproduced the selective precipitation of thaumasite in samples exposed to MgSO<sub>4</sub>.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"163 ","pages":"Article 106190"},"PeriodicalIF":10.8,"publicationDate":"2025-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144269037","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

Achieving instantaneous activation of recycled concrete powder by hyper-gravity carbonation 利用超重力碳化实现再生混凝土粉的瞬时活化

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2025-06-10 DOI: 10.1016/j.cemconcomp.2025.106177

Zhenjiang Gu, Long Jiang, Zihan Ma, Yi Jiang, Peiliang Shen, Chi Sun Poon

引用次数: 0

Production of carbonates calcined clay cement composites via CO2-assisted vigorous stirring 二氧化碳辅助强力搅拌生产碳酸盐煅烧粘土水泥复合材料

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2025-06-10 DOI: 10.1016/j.cemconcomp.2025.106181

Yingliang Zhao , Yong Zheng , Jionghuang He , Kai Cui , Peiliang Shen , Guangmin Peng , Ruilai Guo , Daohui Xia , Chi Sun Poon

{"title":"Production of carbonates calcined clay cement composites via CO2-assisted vigorous stirring","authors":"Yingliang Zhao , Yong Zheng , Jionghuang He , Kai Cui , Peiliang Shen , Guangmin Peng , Ruilai Guo , Daohui Xia , Chi Sun Poon","doi":"10.1016/j.cemconcomp.2025.106181","DOIUrl":"10.1016/j.cemconcomp.2025.106181","url":null,"abstract":"<div><div>Limestone calcined clay cement (LC3) offers a promising approach to reducing CO<sub>2</sub> emissions in the construction industry. However, the early-age compressive strength of LC3 is notably low, primarily due to the high clinker substitution level. This study introduces an innovative carbonate-activated calcined clay cement system, termed C4, produced through a two-step process: pretreating metakaolin (MK) and carbide slag (CS) via CO<sub>2</sub>-assisted vigorous stirring (CAVS), followed by mixing with cement. C4 demonstrated significant improvements in compressive strength, exhibiting increases of over 300 % at 1 day and 60 % at 28 days compared to LC3. These values also exceeded those of ordinary Portland cement (OPC) by 12.7 % and 8.6 %, respectively. The enhanced performance of C4 can be attributed to particle size refinement, structural modification, and phase transformation induced by the CAVS process. These changes facilitated the formation of C-(A)-S-H, which served as nucleation sites, thereby accelerating hydration reactions in C4. Additionally, the CAVS process improved the reactivity of MK by increasing its surface area and generating more active sites for reaction. Furthermore, the calcium carbonate derived from CS carbonation during CAVS exhibited higher reactivity than the calcite present in limestone, promoting monocarbonate precipitation. Collectively, these factors contributed to a denser microstructure, enhancing compressive strength development.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"163 ","pages":"Article 106181"},"PeriodicalIF":10.8,"publicationDate":"2025-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144260354","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