样式: 排序: IF: - GO 导出 标记为已读
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Entrained air and freeze-thaw durability of concrete incorporating nano-fibrillated cellulose (NFC) Cement Concrete Comp. (IF 10.5) Pub Date : 2024-05-13 Obinna Onuaguluchi, Nemkumar Banthia
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Assessing sampling interval-dependent roughness in fractured steel fiber reinforced concrete using a double-exponential decay model Cement Concrete Comp. (IF 10.5) Pub Date : 2024-05-09 Sailong Hou, Kai Li, Xiang Hu, Caijun Shi
This study introduces a double-exponential decay (DED) model to investigate the sampling interval ()-dependent behavior of crack morphology roughness in steel fiber reinforced concrete (SFRC). The root mean square () of the directional derivatives in 3D digital morphology is employed to quantify the roughness and its anisotropic behavior. Surface morphologies of 24 fractured specimens are captured
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Anisotropic expansion behavior and crack orientation of reinforced concrete due to the alkali–silica reaction Cement Concrete Comp. (IF 10.5) Pub Date : 2024-05-08 Sara Farooq, Gentaro Aoki, Taito Miura, Yuichiro Kawabata, Hikaru Nakamura
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Internal curing of fine coral aggregate in cement mortars with low water-to-cement ratio: Difference in freshwater and seawater Cement Concrete Comp. (IF 10.5) Pub Date : 2024-05-07 Weiwei Su, Jianhui Liu, Leping Liu, Zheng Chen, Shichong Zhang, Hang Ruan, Wuwei Yang, Caijun Shi
Fine coral aggregate has a porous structure and high water absorption, which can be used as an internal curing medium. In this study, the pore characteristics and water absorption-desorption of fine coral aggregate were investigated, as well as the difference in internal curing of fine coral aggregate between freshwater and seawater mixed cement mortars with a low water-to-cement ratio. The results
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Improving the air bubble stability of air-entrained mortar in low air pressure environments via adopted rheology and surface tension methods Cement Concrete Comp. (IF 10.5) Pub Date : 2024-05-06 Zonglin Xie, Shenghao Zuo, Lei Chen, Fuwen Zhong, Yi Tian, Qiang Yuan
Air bubble stability in cementitious materials in low air pressure (AP) environments is influenced by the Ostwald ripening process, which causes coarsening behavior of air bubbles. This research reports the enhancement of air bubble stability in low AP via the adoption of rheology and surface tension methods. Besides, the evolution of air bubbles during the cement early hydration process is proposed
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Preparation and formation mechanism of high-toughness organic polymers modified geopolymers Cement Concrete Comp. (IF 10.5) Pub Date : 2024-05-06 Xiaotong Xing, Beihan Wang, Shunjie Luo, Fazhuo Lin, Jiangxiong Wei, Weiting Xu, Jie Hu, Qijun Yu
In recent years, geopolymers have shown potential to replace ordinary cement materials due to their simple preparation, low cost, and excellent performance. Adding organics to geopolymers can enhance toughness and broaden their application potential as building materials. However, the effect of common molding processes to enhance the toughness of organic polymers modified geopolymers remains very limited
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Role of atmospheric-pressure plasma in SiO2 particle deposition onto carbon rovings for improved bond with concrete matrix Cement Concrete Comp. (IF 10.5) Pub Date : 2024-05-06 Hyun-Soo Youm, Sung-Gul Hong
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Ultra-stable foam enabled by nano silica engineering for foam concrete improvement Cement Concrete Comp. (IF 10.5) Pub Date : 2024-05-05 Chunpeng Zhang, Dingqiang Fan, Jian-Xin Lu, Chaoming Pang, Chi Sun Poon
Foam concrete is increasingly applied in construction due to its lightweight, good thermal insulation and fire resistance, and environmental sustainability, while its low strength limits its further popularization and applications. To enhance the stability and performance of foam concrete, amphiphilic nano silica (ANS) was employed in this study to modify the sodium dodecyl sulphate (SDS) based foaming
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Mechanical properties of polymer modified mortars using polymer latexes with varied glass transition temperature and surface charges Cement Concrete Comp. (IF 10.5) Pub Date : 2024-05-03 Chaoyang Zhang, Jian Liu, Shangfeng Zhang, Xiangming Kong
Mechanical properties of polymer modified mortar (PMM) were investigated using self-synthesized polymer latexes with varied glass transition temperature (T) and colloidal surface charges to build correlations between the mechanical properties of PMMs and the intrinsic properties of the polymers. Generally, compressive strength and elastic modulus of mortar are decreased, but ductility and toughness
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Mitigating autogenous shrinkage of cement with carbon nanotube sponge Cement Concrete Comp. (IF 10.5) Pub Date : 2024-05-01 Xinming Wang, Jing Zhong
Autogenous shrinkage can be mitigated by the addition of superabsorbent polymer (SAP), however, typically at the cost of a significant strength loss. To overcome such dilemma, hydrophilic carbon nanotube sponge (H-CNTSP) was proposed in this study as a novel internal curing agent. Due to the high porosity and enriched hydrophilic functional groups, H-CNTSP can absorb pore solution at 72 g/g driven
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Mechanism of fineness and content of quartz powder on the improvement of carbonation curing efficiency Cement Concrete Comp. (IF 10.5) Pub Date : 2024-05-01 Mei-Yu Xuan, Rongxin Guo, Run-Sheng Lin, Xiaolu Wang, Xiao-Yong Wang
Quartz powder is a byproduct of quartzite processing. To date, research on the use of quartz powder in carbonation curing is extremely limited, and the carbonation curing mechanism of concrete containing quartz powder is still unclear. In this study, we focused on the effects of fineness and content of the quartz powder on carbonation curing for cement-quartz powder binary mixtures and compared the
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Experimental verification of innovative spatial reinforcement of ultra-high performance concrete with mesh tubes Cement Concrete Comp. (IF 10.5) Pub Date : 2024-04-29 Anna Szcześniak, Adam Stolarski
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Geopolymers functionalised by antibacterial zeolite against biocorrosion Cement Concrete Comp. (IF 10.5) Pub Date : 2024-04-29 Xiaojuan Kang, Hailong Ye
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Advancing self-cleaning performance in metakaolin-based geopolymers through in-situ zeolite formation and TiO2 integration Cement Concrete Comp. (IF 10.5) Pub Date : 2024-04-29 Xuan Ling, Daoru Liu, Katrin Schollbach, Wei Chen
The deterioration of self-cleaning properties of cementitious materials upon hydration was addressed by in-situ zeolite formation within metakaolin-based geopolymers. Pastes with varied in-situ zeolite content were formulated by adjusting the Si/Al ratio of initial raw materials and curing temperatures. The impact of in-situ zeolite formation on self-cleaning performance was systematically investigated
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Potassium citrate-activated pure BOF slag-based mortars utilizing carbonated and autoclaved BOF slag aggregates Cement Concrete Comp. (IF 10.5) Pub Date : 2024-04-29 Zhihan Jiang, Jonathan Zepper, Xuan Ling, Katrin Schollbach, H.J.H. Brouwers
This study proposes novel basic oxygen furnace (BOF) slag mortars formulated with tri-potassium citrate (TPC) activated BOF slag as binder and treated BOF slag (carbonated (CB) and autoclaved (AB)) as aggregates, aiming to maximize the utilization of BOF slag in the construction industry. Untreated BOF slag (UB) and natural sand (NS) were employed as reference aggregates. The effects of carbonation
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Roles of CO2-BOFS induced CaCO3 in the aluminum-rich GGBS cementitious material system Cement Concrete Comp. (IF 10.5) Pub Date : 2024-04-27 Xinduo Li, Qifeng Song, Tung-Chai Ling
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Influence of superabsorbent polymers on the chloride ingress of mortar measured by chloride diffusion and a quasi-steady-state migration test Cement Concrete Comp. (IF 10.5) Pub Date : 2024-04-26 Tim Van Mullem, Laurena De Brabandere, Emily Van de Voorde, Didier Snoeck, Nele De Belie
The ingress of chloride ions is a serious threat for concrete structures. Superabsorbent polymers (SAPs) are interesting additions to cementitious systems due to their property of absorbing water during mixing and releasing it at a later time to provide internal curing, thereby reducing shrinkage and promoting durability. In addition, SAPs can improve the regain in impermeability of cracks by swelling
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Evaluation of the thermal stability of metakaolin-based geopolymers according to Si/Al ratio and sodium activator Cement Concrete Comp. (IF 10.5) Pub Date : 2024-04-26 Gyeongryul Kim, Seongmin Cho, Sumin Im, Jin Yoon, Heongwon Suh, Manabu Kanematsu, Akihiko Machida, Takahisa Shobu, Sungchul Bae
The thermal stability of geopolymer pastes with different Si/Al ratios (1.5–3.0) and sodium activators (NaSiO and/or NaOH) were evaluated in this study. The inclusion of NaSiO induced an active geopolymer reaction, enhancing pre-heating compressive strength, but gradually reduced from 300 °C due to vapor pressure and microstructural deterioration caused by entrapped physically bound water. Conversely
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Quantitative image analysis on the filling proportion of corrosion products in reinforced concrete using X-ray computed tomography Cement Concrete Comp. (IF 10.5) Pub Date : 2024-04-25 Yuzhou Wang, Xu Miao, Yuxi Zhao, Ligang Peng, Dandan Xu, Jianghong Mao
Corrosion-product filling inhibits corrosion-induced cracking in reinforced concrete (RC) structures, thereby affecting structural deterioration. However, the accurate quantification of corrosion-product filling has challenged the scientific and engineering communities. In this study, a novel method for quantifying the filling proportion of corrosion products at the macro- and meso-scales using X-ray
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Enhancing carbonation and thermal insulation of reactive magnesium oxide cement (RMC)-based 3D printable pastes with cenospheres Cement Concrete Comp. (IF 10.5) Pub Date : 2024-04-24 Xiangyu Wang, Padmaja Krishnan, Kemal Celik
Reactive magnesium oxide cement (RMC) has been proposed as a sustainable alternative to ordinary Portland cement (OPC) due to its lower production temperature and ability to permanently sequester carbon dioxide (CO) through carbonation. However, mixtures with only RMC can have significantly reduced CO absorption capacity due to limited CO diffusion, thereby compromising the performance of RMCs. This
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Production of vaterite via wet carbonation of carbide residue: Enhancing cement properties and CO2 sequestration Cement Concrete Comp. (IF 10.5) Pub Date : 2024-04-24 Yeqiang Zhou, Fengshun Wu, Lei Jinag, Bao Lu, Guihua Hou, Jianping Zhu
The influence of limestone powder (primarily composed of calcite) on hydration and properties of concrete has been extensively researched. However, there is limited understanding of how different calcium carbonate (CC) polymorphs affect cement hydration due to the difficulty in formation of vaterite. Therefore, preparing calcite and vaterite from solid waste carbide residue (CS) by wet carbonation
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Effect of steel fibre with different orientations on mechanical properties of 3D-printed steel-fibre reinforced concrete: Mesoscale finite element analysis Cement Concrete Comp. (IF 10.5) Pub Date : 2024-04-24 Yekai Yang, Pengyuan Lu, Zhongxian Liu, Liang Dong, Jianjun Lin, Ting Yang, Quanchang Ren, Chengqing Wu
It is widely recognized that steel fibres exhibit directional distribution during the preparation of 3D-printed steel fibre reinforced concrete (SFRC). The degree of fibre orientation varies due to several factors, such as nozzle size and layer height. This variation in fibre orientation range may result in different mechanical performance exhibited by 3D-printed SFRC at hardened state. To explore
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Alkali-activated blast furnace ferronickel slag for Cr immobilization Cement Concrete Comp. (IF 10.5) Pub Date : 2024-04-23 Dengquan Wang, Bin Ma, Lang Pang, Qiang Wang
Efficiently managing and utilizing Cr-containing slags and wastes is a global urgency. Alkali-activated materials offer a sustainable and cost-effective solution. This study investigated eco-friendly alkali-activated blast furnace ferronickel slag (AA-BFFS) for both self-stabilization/solidification (SS) of Cr-containing BFFS and immobilization of external Cr ions. Our investigation involved comprehensive
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Thermomechanical behavior of textile-reinforced geopolymer concrete based on mineral-impregnated carbon-fibers (MCFs) composites Cement Concrete Comp. (IF 10.5) Pub Date : 2024-04-20 Jitong Zhao, Ameer Hamza Ahmed, Marco Liebscher, Alena Bartsch, Egor Ivaniuk, Marko Butler, Jan Kohout, Pavlína Hájková, Viktor Mechtcherine
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Evaluation method of the synergistic service performance between ultrahigh-performance concrete and normal strength concrete based on the parameter of environmental equivalent force ratio Cement Concrete Comp. (IF 10.5) Pub Date : 2024-04-20 Shuo Feng, Jingjing Lyu, Huigang Xiao, Qingsong Zhang, Yifei Li
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Exploring the nonlinear behavior of flow through cracked concrete by water permeability test Cement Concrete Comp. (IF 10.5) Pub Date : 2024-04-20 Sailong Hou, Kai Li, Xiang Hu, Caijun Shi
This study investigates the nonlinear behavior of flow passing through 28 crack topographies in concrete at various pressure gradients using water permeability test. Artificial cracks were generated and quantified by point-cloud matching technique. Results indicate Darcy's law becomes biased for calculating an apparent transmissivity of cracked concrete at a high Reynolds number. As an alternative
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Effects of mixing conditions and activator anionic species on the rheology of silicate-activated slag concrete Cement Concrete Comp. (IF 10.5) Pub Date : 2024-04-20 Yubo Sun, Manu K. Mohan, Xiaodi Dai, Yiyuan Zhang, Guang Ye, Geert De Schutter
The proper control of the rheological performance of silicate-based alkali-activated slag (AAS) mixtures is problematic, as the conventional superplasticizers become less effective in alkaline media. Nevertheless, several methods have been proposed to improve the workability of silicate-activated AAS, such as by extending the mixing time, and replacing sodium silicate with sodium carbonate activators
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Flexural fatigue behavior of ultra-high performance concrete under low temperatures Cement Concrete Comp. (IF 10.5) Pub Date : 2024-04-20 Xin Tian, Zhi Fang, Shaokun Liu, Yu Xiang, Qimu Zhu, Yi Shao
Ultra-high performance concrete (UHPC) shows superior mechanical performance, which leads to increasing applications in infrastructure constructions that are subjected to different loading (i.e., flexure, tension, compression, etc.) and environmental conditions (ambient, freeze, etc.). Among them, the flexural performance of UHPC under low temperatures (i.e., sub-zero temperature) is still little understood
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A unified tensile constitutive model for mono/hybrid fibre-reinforced ultra-high-performance concrete (UHPC) Cement Concrete Comp. (IF 10.5) Pub Date : 2024-04-20 Shack Yee Hiew, Keat Bin Teoh, Sudharshan N. Raman, Chung-Chan Hung, Ya Xuan Chaen, Daniel Kong, Milad Hafezolghorani
Providing a representative and reliable tensile constitutive model for ultra-high-performance concrete (UHPC) has been challenging in the past due to the absence of standardised test methods. In this paper, the authors have proposed a unified constitutive model calibrated to the most commonly used types of steel fibres within the practical range of fibre content. While the novel model serves as the
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Effect of particle size on cement foams Cement Concrete Comp. (IF 10.5) Pub Date : 2024-04-19 Qiang Zeng, Shan Chen, Rongjia Wen, Yu Peng, Zhendi Wang, Yang Zhao
This work attempts to elucidate the foaming kinetics, hierarchical structures, engineering properties and mechanisms of cement foams with high-volume quartz powder (QP) of different fineness from 200 to 2000 meshes. Comprehensive experiments were conducted to measure the fresh slurry properties, foaming process, penetration strength, and structure of the foams and skeletons. Foaming kinetics was analyzed
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Piezoresistive performance of cement-based composites with two-dimensional MXene subjected to various loading conditions and water content Cement Concrete Comp. (IF 10.5) Pub Date : 2024-04-18 Zhengxiang Lin, Xiaodan Tang, Weizhun Jin, Xinyi Zhao, Jinghui Zhang, Hongqiang Chu, Linhua Jiang
Two-dimension MXene was applied in cement to fabricate MXene cement-based sensor used in structural health monitoring. The effect of MXene content on the piezoresistive performance of MXene cement-based composites (MCBC) was investigated. The fractional change in resistivity () under different loading rate, water content and failure load were also measured. Microanalysis results proves that MXene can
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Effects of sodium aluminate on fleeting semi-dry carbonation and properties of steel slag powders in low concentration CO2 atmosphere Cement Concrete Comp. (IF 10.5) Pub Date : 2024-04-18 Shuo Yang, Liwu Mo, Duyou Lu
Accelerated carbonation suffers from the limitation of low efficiency when CO supply is inadequate. This study aims at proposing a carbonation accelerator of sodium aluminate (SA) to stimulate the reaction between steel slag and CO. Additionally, a fleeting semi-dry carbonation is proposed and mixed gas with 20 vol% CO was used to simulate the CO concentration of flue gas. According to the MGC results
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Influences of composition and reaction conditions on molecular structure, hygroscopicity, and swelling behavior of alkali-silica reaction gels Cement Concrete Comp. (IF 10.5) Pub Date : 2024-04-11 Arkabrata Sinha, Jianqiang Wei
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Understanding the multiple actions of phosphoric acid-modified steel slag powder on early-age hydration of cement Cement Concrete Comp. (IF 10.5) Pub Date : 2024-04-10 Zedi Zhang, Zijian Jia, Ruilin Cao, Wei Wang, Chao Liu, Yueyi Gao, Nemkumar Banthia, Yamei Zhang
The retardation of the early-age hydration of cement by steel slag powder severely restricts its use in cementitious materials. This paper reports on the modification of steel slag powder with phosphoric acid, which is found to alleviate its inhibition of cement hydration. Comprehensive investigations of solid phase assemblage and elements dissolving behavior in cement pastes reveal that multiple actions
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The effect of depth-dependent carbonation on the interfacial strength between GFRP reinforcement bar and reactive magnesia cementitious composites Cement Concrete Comp. (IF 10.5) Pub Date : 2024-04-10 Bo Wu, Peng Wang, Xianjun Su, Weiwen Li, Christopher K.Y. Leung, Jishen Qiu
Reactive magnesia cement (RMC) is an emerging class of low-alkaline and CO-sequestering binder, which can mitigate the deterioration of GFRP reinforcements induced by a high-alkaline environment, e.g., in Portland cement. This study investigated the slip behavior of GFRP rebar embedded in RMC composite, which varies with carbonation depth significantly. The variation of the interfacial bond was determined
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Evaluation of novel copper-based antimicrobial admixtures for biocorrosion mitigation of cement paste Cement Concrete Comp. (IF 10.5) Pub Date : 2024-04-09 Weichao Ying, Hailong Ye
Copper-based antimicrobial admixtures have been favoured for mitigating microbially induced concrete corrosion (MICC) owing to their practical bactericidal abilities. However, concerns regarding the leachability of hazardous components and the long-term efficacy of these admixtures have hindered their industrial application, with limited understanding of their comparative antimicrobial performance
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The industrial SO2-induced corrosion: Investigation of the corrosion onset Cement Concrete Comp. (IF 10.5) Pub Date : 2024-04-09 Jie Huang, Ditao Niu, Hongqu Wu, Yao Lv, Qiang Fu
The stability of the passivation film on reinforcing steel is significantly influenced by the internal chemical environment of concrete under industrial sulfur dioxide (SO) corrosion. This study aimed to investigate the electrochemical state of the reinforcing steel and the internal chemical environment (corrosion products, phase composition, and pore structure) of concrete by conducting indoor simulations
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Understanding the rheological behavior of reactive magnesia-metakaolin system in the context of digital construction Cement Concrete Comp. (IF 10.5) Pub Date : 2024-04-08 Yiming Peng, Cise Unluer
Application of 3D printing in building projects can enhance construction efficiency and productivity. Rheological properties play a key role in defining the suitability of different cement-based mixes for digital construction. In this study, the rheological behavior of the MgO-SiO system involving metakaolin (MK) as the silica source was thoroughly investigated. Mixes with two different MgO/MK ratios
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Study on the deterioration of concrete performance in saline soil area under the combined effect of high low temperatures, chloride and sulfate salts Cement Concrete Comp. (IF 10.5) Pub Date : 2024-04-04 Daming Luo, Fan Li, Ditao Niu
Concrete structures in saline soil regions are prone to degradation due to chloride and sulfate erosion, compounded by the concurrent influences of drying, high and low temperatures, and freeze-thaw cycles. This study establishes a simulation test system for complex saline soil environments, integrating findings from real-world environmental investigations. The investigation focused on the degradation
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Influence of type and particle size of superabsorbent polymer on early water distribution and internal curing zone properties of cement paste Cement Concrete Comp. (IF 10.5) Pub Date : 2024-04-04 Fangyu Chen, Shuai Bai, Xinchun Guan, Jing Qiao, Heqing Gou
The types of commercial superabsorbent polymer (SAP) mainly include ionic-SAP acrylic acid (AA) and nonionic-SAP acrylamide-acrylic acid copolymer (AM), which have different particle sizes due to the limited preparation methods. This study used H low-field NMR to clarify the influence of type and particle size of SAP on the water distribution of cement paste. Backscattering electrons and nanoindentation
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Enhancing compressive strength in cementitious composites via plasma-treated PET aggregates: Insights into interface mechanics Cement Concrete Comp. (IF 10.5) Pub Date : 2024-04-04 Huali Hao, Shan Li, Cheuk Lun Chow, Denvid Lau
Surface modification stands out as a promising solution for augmenting interface bonding of cement-based materials incorporating recycled plastic waste as a substitution for natural aggregates. In this work, plasma treatment was employed for surface modification, and the compressive strength of fabricated mortar with plasma-treated PET particles was improved by approximately 9% after a 28-day curing
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Enhanced mechanical property of steel slag through glycine-assisted hydration and carbonation curing Cement Concrete Comp. (IF 10.5) Pub Date : 2024-04-04 Seohyun Kim, Jaekyun Kim, Dongho Jeon, Jusung Yang, Juhyuk Moon
Steel slag, an industrial by-product from the steelmaking process, has limited utilities primarily due to its low reactivity and grindability. This study proposed a new method to actively utilize steel slag as a cementless binder by adding glycine to enhance the reactivity of steel slag under CO curing condition. Employing glycine as an activator under 1 day of hydration followed by 7 days of carbonation
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Dynamic behaviors of nickel coated carbon nanotubes reinforced ultra-high performance cementitious composites under high strain rate impact loading Cement Concrete Comp. (IF 10.5) Pub Date : 2024-04-04 Danna Wang, Xinyue Wang, Hailong Ye, Feng Yu, Baoguo Han
Understanding the dynamic mechanical behaviors of materials is a prerequisite for reliably analyzing and predicting the dynamic response of structures, which is of great significance for transportation infrastructure and military engineering subjected to extreme loads, particularly dynamic loads at high strain rates. Nickel coated multi-walled carbon nanotubes (Ni-MWCNTs) show promise as a reinforcement
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Carbonation curing of belite-rich cement: The role of fly ash and strengthening mechanism Cement Concrete Comp. (IF 10.5) Pub Date : 2024-04-03 Qingfeng Guan, Yuefeng Ma, Ming Jin, Haoyu Zeng, Chang Gao, Jinhui Tang, Jianzhong Liu, Fangyu Han, Wenwei Li, Jiaping Liu
Belite-rich cement (BRC) has gained increased attention in recent years due to its low energy consumption and high long-term performance. However, the carbonation behavior of the binder formed by its combination with fly ash (FA) has been scarcely revealed. This study investigated the influence of carbonation curing and FA replacement level on the carbon capture and mechanical properties of BRC. The
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Effect of 2-acrylamide-2-methylpropane sulfonic acid on the early strength enhancement of calcium silicate hydrate seed Cement Concrete Comp. (IF 10.5) Pub Date : 2024-04-02 Fengzhen Lei, Lei Lei, Yangyang Kang, Caijun Shi
Nanomaterials are becoming widely used in cement to enhance the properties of cement-based materials. Artificially synthesized nano-C-S-H serves as a nucleation site for the hydration product C–S–H gel, facilitating its formation. This is deemed as an early strength agent to effectively promote cement hydration. Introducing comb-like polycarboxylate ether (PCE) during the synthesis of C–S–H can effectively
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The hydration and heavy metal immobilization performance of the CO2-active incineration fly ash-calcined clay-cement (CFC3) composite low-carbon cementitious system Cement Concrete Comp. (IF 10.5) Pub Date : 2024-03-31 Junjie Hu, Renjie Niu, Junyao Liu, Weizhuo Zhang, Jun Liu, Feng Xing
CO-active enhances the performance of municipal solid waste incineration fly ash as a supplementary cementitious material, increasing its utilization in cementitious systems. CFC, a low-carbon cementitious material, effectively utilizes CO-active incineration fly ash (CIFA). To minimize cement usage, the component effects on hydration need to be studied. In this study, hydration, mechanical and environmental
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Quantitative characterization and control mechanism of pore structure in geopolymer foams with addition of various surfactants Cement Concrete Comp. (IF 10.5) Pub Date : 2024-03-30 Ningning Shao, Chunling Dong, Xuankun Wei, Yiping Su, Zhijun Dong, Zuotai Zhang
Pore structure control mechanism in geopolymer foams (GPFs) remains qualitatively understood, posing great challenges for GPF applications. In this study, by modelling of various pore structures with regular geometric patterns, total porosity, open porosity, pore size distribution, and pore deformation were quantitatively characterized. Then, we focused on slurry viscosity and surface tension as the
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Water loss and shrinkage prediction in 3D printed concrete with varying w/c and specimen sizes Cement Concrete Comp. (IF 10.5) Pub Date : 2024-03-29 Lei Ma, Zijian Jia, Yuning Chen, Yifan Jiang, Bruno Huet, Arnaud Delaplace, Yamei Zhang, Qing Zhang
In 3D printed concrete (3DPC), the absence of formwork leads to increased shrinkage compared to traditional cast concrete which uses formwork. This increase in shrinkage is primarily due to the rapid evaporation of moisture during the early stages. Therefore, our research focused on how the initial water content and the exposed surface area affect the total shrinkage by varying water-to-cement ratio
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In-situ investigation on the carbonation behaviors of various mineral phases in steel slag: The role of RO phase Cement Concrete Comp. (IF 10.5) Pub Date : 2024-03-29 Peng Liu, Liwu Mo, Jingkui Zhong, Mingshu Tang
Exploring the mineral compositions of steel slag and the microstructure evolutions of its carbonation products is very important for deeply understanding the carbonation mechanism of steel slag, which can promote the application of steel slag in carbon capture and storage. In this paper, the carbonation behaviors of various mineral phases in steel slag were investigated by using an ingenious in-situ
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Review on physical and chemical activation strategies for ultra-high performance concrete (UHPC) Cement Concrete Comp. (IF 10.5) Pub Date : 2024-03-27 Xin Su, Zhigang Ren, Peipeng Li
This paper aims to investigate the latest advancement in physical and chemical activation strategies for ultra-high performance concrete (UHPC), addressing challenges such as high autogenous shrinkage, insufficient hydration, and inadequate steel fibers utilization, to further enhance its performance and achieve broader application. Firstly, an in-depth discussion is provided on physical activation
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Pretreatment of alkali activation and carbonation of steel slag for using as binding material Cement Concrete Comp. (IF 10.5) Pub Date : 2024-03-26 Wenzheng Li, Mingli Cao, Fangyu Liu, Dan Wang, Jun Chang
Steel slag (SS) exhibits low hydration activities and expansive phases, which should be pretreated prior to using as binding materials. Thus, these properties of SS were improved through a combined treatment of alkali and then wet carbonation (A_C) in this study. Effect of sodium silicate modulus (M = 1.0–2.5) and carbonation temperature (50–200 °C) on cementitious property of SS was investigated.
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Strength and stiffness characterization of ultra-high performance concrete (UHPC) cement paste phases through in-situ micro-mechanical testing Cement Concrete Comp. (IF 10.5) Pub Date : 2024-03-26 C. Puttbach, G.S. Prinz, C.D. Murray
Compressive strength and stiffness of concrete materials involve the complex interaction of aggregates and hardened cement, which can involve even more complex phases formed through hydration processes. Typically, the strength and stiffness of concrete materials are determined through material-scale testing, focusing on the bulk behavior while ignoring individual constitutive material interactions
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Orientation Dependency of 3D printed SHCC at increasing length scale Cement Concrete Comp. (IF 10.5) Pub Date : 2024-03-22 K. Nefs, K.C.J. de Kroon, J. Sloots, F.P. Bos, T.A.M. Salet
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Failure mechanism of steel fiber pullout in UHPC affected by alternating cryogenic and elevated variation Cement Concrete Comp. (IF 10.5) Pub Date : 2024-03-21 Bei He, Obinna Onuaguluchi, Nemkumar Banthia, Hongen Zhang, Qiang Ren, Yi Zhang, Zhengwu Jiang
This paper investigates the pullout response of straight and hooked-end steel fiber embedded in Ultra-high Performance Concrete (UHPC) subjected to alternating cryogenic (−170 °C) and elevated (200 °C) temperature variation. The temporal evolution of Acoustic Emission (AE) parameters and failure behavior during the pullout process were monitored in situ using the AE test. Additionally, changes in the
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Cementation of spent radioactive ion-exchange resin ashes using alkali-activated cements: Physicochemical and structural changes Cement Concrete Comp. (IF 10.5) Pub Date : 2024-03-20 Pedro Perez-Cortes, Ines Garcia-Lodeiro, María Cruz Alonso, Francisca Puertas
Spent ion-exchange resins (IERs) constitute the major volume of solid radioactive wastes generated by the nuclear industry and Portland cement wasteforms exhibit limitations for their conditioning and storage. In this paper, an alternative approach is conducted involving the solidification of IER ashes (IERAs) through the use of “one-part” alkali-activated cements (AACs). Systems with different chemistry
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Tomographic analysis of segregation behavior of hollow glass microspheres in lightweight cementitious composites Cement Concrete Comp. (IF 10.5) Pub Date : 2024-03-19 Jingwei Yang, Hyunuk Kang, Caijun Shi, Xiang Hu, Juhyuk Moon
Lightweight concrete must contain lightweight aggregates that are more susceptible to segregation than traditional concrete. Concrete has increasingly used lightweight fillers but research on segregation analysis is relatively scarce. To systematically investigate the segregation of hollow glass microspheres (HGMs), lightweight cementitious composites (LWCC) with a water-to-cement (w/c) ratio of 0
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Enhancing the mechanical properties and hydration of cement paste by incorporating GO/nano In(OH)3 composite with high specific surface area Cement Concrete Comp. (IF 10.5) Pub Date : 2024-03-18 Xingyu Gan, Yali Li, Weichao Li, Laibo Li, Lingchao Lu, Xin Cheng
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Synergy of micron graphite and fly ash for alkali-activated cementitious material: Electromagnetic absorption characteristics and mechanism Cement Concrete Comp. (IF 10.5) Pub Date : 2024-03-16 Peiqi Zheng, Kaixuan Zhang, Weize Wang, Jing Wang, Xiuzhi Zhang
To attain a balance between compressive strength and electromagnetic wave absorption performance, this paper combined two electromagnetic wave loss mechanisms (magnetic loss and electrical loss), and prepared an environmentally friendly alkali-activated slag/fly cementitious material (ASFC) using micron graphite (MG) as the absorber and ground granulated blast furnace slag (GGBS) and fly ash (FA) as
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Flexural performance of nature-inspired 3D-printed strain-hardening cementitious composites (3DP-SHCC) with Bouligand structures Cement Concrete Comp. (IF 10.5) Pub Date : 2024-03-14 Guoqiang Du, Yan Sun, Ye Qian
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Polymer/cement composite electrolyte with high strength and high ionic conductivity for structural supercapacitors Cement Concrete Comp. (IF 10.5) Pub Date : 2024-03-12 Yuanyuan Zhang, Dong Zhang
All-solid-state structural supercapacitors (ASSC) based on polymer/cement electrolytes (PCE) are promising energy storage devices in buildings due to the tremendous demand for zero-energy buildings. However, the challenge of PCE remains in well balancing the mechanical properties and ionic conductivity. Herein, an integrated electro-mechanical PCE introducing PAM (20 wt%, synthesized by in-situ polymerization)