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Contradict mechanism of long-term magnesium and sodium sulfate attacks of nano silica-modified cement mortars – Experimental and thermodynamic modeling Cement Concrete Comp. (IF 10.5) Pub Date : 2024-01-19 Qian Huang, Qiao Wang, Xiaohong Zhu
The mechanisms of external sulfate attack on cement mortars containing nano silica have been studied under full immersion conditions after 3 years. The sulfate degradation processes were compared between sodium sulfate and magnesium sulfate solutions with nano-silica replacements of 0, 1, and 8 wt% in CEM I Portland cement. Expansion, mass/strength loss, and microstructural alterations (spatial distribution
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Characterisation of a 3D-printed alkali-activated material based on waste mineral wool at room and elevated temperatures Cement Concrete Comp. (IF 10.5) Pub Date : 2024-01-17 Majda Pavlin, Barbara Horvat, Romana Cerc Korošec, Rok Capuder, Lidija Korat, Vilma Ducman
Abstract not available
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Autolytic capsules incorporating alkali-activated slag system for self-healing cementitious composites Cement Concrete Comp. (IF 10.5) Pub Date : 2024-01-11 Junchen Xiang, Jingping Qiu, Pinqi Wu, Qingsong Zhang, Yuying Song, Lei Yang
The optimization of healing materials used in capsules for effective crack self-healing has garnered significant attention. This study focused on the development of a novel capsule using a full-solid-waste alkali-activated slag system. Instead of traditional cement clinker and chemical agents, healing materials such as red mud, calcium carbide residue, phosphogypsum, and ground granulated blast furnace
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Influence of engineered self-healing systems on ASR damage development in concrete Cement Concrete Comp. (IF 10.5) Pub Date : 2024-01-10 Diego J. De Souza, Leandro F.M. Sanchez, Alireza Biparva
Supplementary cementing materials (SCMs) have proven effective in minimizing alkali-silica reaction (ASR) development. In addition, crystalline admixtures (CAs) have been identified as potential solutions to counteract damage in concrete. However, limited data on this topic is available in the literature. This study investigates the impact of CA on concrete damage and is divided into two phases: 1)
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Impact of triethanolamine on the hydration of Portland cement in the presence of high pozzolanic activity supplementary cementitious materials Cement Concrete Comp. (IF 10.5) Pub Date : 2024-01-05 Jun Jiang, Zhengmao Ye, Jiaming Wu, Qingchun Yang, Quanliang Li, Xiangming Kong
Triethanolamine (TEA) is a widely employed cement accelerator that has been demonstrated to have a favorable impact on the early strength of cement at moderate dosing levels, while having a slight or negative impact on the later strength. This study systematically investigates the hydration pattern and strength development of Portland cement systems with the incorporation of fly ash microspheres and
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Mitigating chloride attack in cementitious materials without compromising other properties via the use of viscosity modifying admixture Cement Concrete Comp. (IF 10.5) Pub Date : 2024-01-10 Lixiao Zhao, Pan Feng, Xuyan Shen, Hui Rong, Changwen Miao, Guoqing Geng
To mitigate the harmful chemicals ingression into cementitious materials, traditional methods often aim to densify the pore structure, posing challenges for concrete dead-load or crack control. This paper proposes a facile method to mitigate chloride attack via increasing the pore solution viscosity in cementitious material without changing the matrix density or compromising other properties. The results
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Insight into ion exchange behavior of LDHs: Asynchronous chloride adsorption and intercalated ions release processes Cement Concrete Comp. (IF 10.5) Pub Date : 2024-01-04 Zhipeng Xu, Yuchen Wu, Zhangmin Zhang, Yangyang Wang, Jie Hu, Yuwei Ma, Zuhua Zhang, Haoliang Huang, Jiangxiong Wei, Caijun Shi, Qijun Yu
Cl− adsorption and intercalated ions release processes during LDHs are highly intricate phenomena. In this study, ion exchange performance of LDHs with specific cation interlayers and intercalated anions (CaAl–NO3-LDHs, CaAl–NO2-LDHs, CaFeAl–NO3-LDHs and CaFeAl–NO2-LDHs) were extensively investigated. The results indicate that in the presence of low chloride concentration, the intercalated anions are
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Gold-sputtered LPG fiber sensor pulse electroplated with iron-carbon for monitoring passivation and depassivation of carbon steel in concrete pore solutions Cement Concrete Comp. (IF 10.5) Pub Date : 2024-01-04 Guoshuai Zhou, Fujian Tang, Gang Li, Hong-Nan Li
Monitoring the passivation and depassivation of reinforcement steel is of significant importance, particularly for certain reinforced concrete structures that define the time of steel rebar depassivation as the end of the durability service life. In this study, a gold-sputtered long-period grating (LPG) optical fiber sensor coated with pulse-electroplated iron-carbon is characterized for continuous
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Alkaline activated cements obtained from ferrous and non-ferrous slags. Electric arc furnace slag, ladle furnace slag, copper slag and silico-manganese slag Cement Concrete Comp. (IF 10.5) Pub Date : 2023-12-30 M.A. Gómez-Casero, S. Bueno-Rodríguez, E. Castro, D. Eliche Quesada
Ferrous slag: electric arc furnace slag (EAFS) and ladle furnace slag (LFS); and non-ferrous slag: copper slag (CS) and silicon-manganese slag (SiMnS) have been used as precursors for alkali activated cements (AACs). The objective of the study was to evaluate the effect of the silica modulus (Ms = SiO2/K2O) (0.5–1.8) of the potassium silicate/potassium hydroxide solution on the microstructure and technological
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Preparation and mechanical characterization of multi-functional high-ductility engineered magnesium oxysulfate cement-based composites Cement Concrete Comp. (IF 10.5) Pub Date : 2024-01-01 Mingzheng Zhu, Bing Chen, Pei Yan, Meng Wu, Jiaxing Han
Aiming at the integrated requirements of building energy saving and thermal insulation reinforcement in reinforcement engineering, the technology of preparing multi-functional high-ductility engineered magnesium oxysulfate cement-based composites (MOSC-ECC) by magnesium oxysulfate cement (MOSC) was proposed; the mechanism of industrial waste fly ash (FA) to improve the ductility of MOSC-ECC was explored;
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Effect of the incorporation ratio of recycled concrete aggregate on the properties of self-compacting mortar Cement Concrete Comp. (IF 10.5) Pub Date : 2024-01-02 Tian Li, Rita Nogueira, Manuel Francisco Costa Pereira, Jorge de Brito, Jiaping Liu
This paper investigates the effect of the addition of recycled concrete aggregate (RCA) on the properties of self-compacting cement-based materials at the mortar scale, at the incorporation ratios of 0, 25, 50, and 100 %. The results showed that the yield stress and the plastic viscosity of the mortar increased with the incorporation ratio of RCA. Slump flow and V-funnel time were used to assess these
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Mesoscopic discrete modeling of compression and fracture behavior of concrete: Effects of aggregate size distribution and interface transition zone Cement Concrete Comp. (IF 10.5) Pub Date : 2023-12-27 Lifu Yang, Kai Li, Xiang Hu, Zesen Peng, Qing-feng Liu, Caijun Shi
This paper presents a mesoscopic discrete modeling approach for studying compression and fracture behavior of concrete. A modified piecewise linear sieve curve was proposed to generate irregularly shaped aggregates following specific particle size distributions, and then a random particle model and the parallel bond model were implemented within a 3D framework of discrete element model (DEM). To characterize
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Methodology to design eco-friendly fiber-reinforced concrete for 3D printing Cement Concrete Comp. (IF 10.5) Pub Date : 2023-12-28 Haodao Li, Alfred Addai-Nimoh, Eric Kreiger, Kamal H. Khayat
Greater use of locally available supplementary cementitious materials (SCM) to reduce cement content and addition of fiber reinforcement can enhance the performance of 3D printing (3DP) technology in construction. In this study, three classes of eco-friendly 3D printable fiber-reinforced mixtures were targeted, namely ultra-high-performance concrete (UHPC), high-performance concrete (HPC), and conventional
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Alkali thermal fusion: A prospective route to enhance the reactivity of low-grade clay and utilize as supplementary cementitious material (SCM) Cement Concrete Comp. (IF 10.5) Pub Date : 2023-12-29 Ishrat Baki Borno, Nair Nithya, Ashraf Warda
Common clay deposits contain a variety of minerals that provide low and unpredictable reactivity even after calcination. This study aims to enhance the reactivity of such low-grade clay via alkali thermal fusion, where clay was co-calcined with different dosages of NaOH to achieve superior reactivity. The effects of such co-calcination on the formation of reactive aluminosilicates were monitored using
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Analysis of the tensile behavior of FRP textile for multi-scale fiber reinforced cementitious composite Cement Concrete Comp. (IF 10.5) Pub Date : 2023-12-29 Peizhao Zhou, Peng Feng, Jishen Qiu
Fiber reinforced polymer (FRP) textile, as the continuous reinforcement of multi-scale fiber reinforced cementitious composite (MSFRC), is expected to be widely applied due to the high strength, lightness, anti-corrosion and ease of installation. In this work, the unique features of FRP textile, characterized by initial delayed stiffness and strength efficiency, are investigated thoroughly. First,
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Design of a smart protective coating with molybdate-loaded halloysite nanotubes towards corrosion protection in reinforced concrete Cement Concrete Comp. (IF 10.5) Pub Date : 2023-12-28 Yongqi Liu, Jinjie Shi
Using protective coatings is widely acknowledged as an effective strategy for preventing the corrosion of reinforcing steel and improving the durability of reinforced concrete structures. Nevertheless, a common challenge faced by the traditional coatings lies in the significantly reduced corrosion resistance due to its damage and cracking during the service life. Accordingly, a smart protective coating
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Multi-scale experimental studies on mechanical properties of three-dimensional porous graphene cementitious composite Cement Concrete Comp. (IF 10.5) Pub Date : 2023-12-28 Jingwei Ying, Zhenming Xie, Baixi Chen, Zhijun Jiang, Zhiqun Tian, Jianzhuang Xiao
This study aimed to reveal the influence of 3D porous graphene on the cementitious composites from multiple scales. At the macro level, the 3D porous graphene could greatly improve the strength, elastic modulus, and crack resistance of the cementitious composite. At the micro level, the nanoindentation test indicated that the thickness of the interfacial transition zone (ITZ) could be reduced by adding
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High ductility cementitious composites incorporating seawater and coral sand (SCS-HDCC) for offshore engineering: Microstructure, mechanical performance and sustainability Cement Concrete Comp. (IF 10.5) Pub Date : 2023-12-24 Guo Li-ping, Fei Xiang-peng, Wu Jian-dong, Zhao Ling-yi, Lyu Bang-cheng, Chu Ying jie
In support of sustainable development strategies, engineering construction on remote islands is conductive to promoting the development of marine resources and mitigating increasingly severe resource conflicts. However, marine engineering, facing extreme weather and natural disasters, necessitates concrete with high ductility, durability and crack control capacity. This study evaluates the feasibility
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Rheological enhancement of fresh polymer-modified cement composites via surface-modified graphene oxide Cement Concrete Comp. (IF 10.5) Pub Date : 2023-12-22 Zunaira Naseem, Ezzatollah Shamsaei, Kwesi Sagoe-Crentsil, Wenhui Duan
Polymer-modified cement (PMC) composites are extensively utilized in modern construction, especially in tunneling and structural applications, but their excessive flowability and reduced thixotropy continue to present fundamental rheological challenges. We present a novel approach to improving the rheological performance of PMC via surface-modified graphene oxide (GO), i.e., GOPMC composites. Specifically
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Real-time monitoring of self-sensing cementitious composite incorporating hybrid silicon carbide and graphite for enhanced structural health monitoring Cement Concrete Comp. (IF 10.5) Pub Date : 2023-12-12 Tadesse Natoli Abebe, Byeong-Hun Woo, Hong Gi Kim, Jae-Suk Ryou
This manuscript presents a comprehensive exploration of Silicon Carbide-Graphite Cement Composites (SCGCCs) by investigating their mechanical, electrical, and self-sensing properties. The study systematically varies SiC and graphite content, leading to remarkable insights. In terms of mechanical strength, specimens S50G1 and S50 stand out, exhibiting impressive enhancements of 15.6 % and 9.8 % in compressive
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Investigation of high strain rate effects on strain-hardening cementitious composites using Voronoi-cell lattice models Cement Concrete Comp. (IF 10.5) Pub Date : 2023-12-14 Ji Woon Park, Bonhwi Choo, John E. Bolander, Yun Mook Lim
Strain-hardening cementitious composites (SHCC) have been reported in several studies to exhibit in several studies to exhibit high toughness even under extreme dynamic loads. To understand such dynamic behavior of SHCC, this study extends a previously developed rate-dependent lattice model by introducing a non-local formulation of the fiber-matrix interface behavior. The Voronoi-cell lattice model
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Ascorbic acid: A green admixture for eco-efficient metakaolin blended cement with enhanced properties and corrosion resistance Cement Concrete Comp. (IF 10.5) Pub Date : 2023-12-13 Liang Wang, Jialai Wang, Hao Wang, Xin Qian, Yi Fang, Yan Ge, Xuepeng Wang, Xiaozhi Zhao, Monica Lages Do Amaral
This study explores ascorbic acid (AA) as a green, multipurpose admixture to improve the eco-efficiency of metakaolin (MK) blended cement mortar. The AA can be simply added into a mortar mix at a very small dosage to function as a hydration retarder, a water reducer, a strength enhancer, an autogenous shrinkage reducer, and a corrosion inhibitor for reinforcing bars. With four hydroxyl groups, AA can
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Durability of geopolymer cutoff wall backfill incorporating reactive MgO particles under dry-wet cycles Cement Concrete Comp. (IF 10.5) Pub Date : 2023-12-13 Hong-Xin Chen, Qin-Pei Xue, Shi-Jin Feng, Qi-Teng Zheng, Dong-Jiang Lv
Vertical cutoff wall has been employed for decades to control groundwater flow and subsurface contaminant transport. The barrier performance of cutoff wall material may significantly deteriorate under dry-wet cycles due to precipitation, drought, and groundwater fluctuation. This study adopted active magnesium oxide (MgO) particles to enhance the durability of geopolymer cutoff wall backfill (GCWB)
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Flexural bond behavior and development length of ribbed CFRP bars in UHPFRC Cement Concrete Comp. (IF 10.5) Pub Date : 2023-12-12 Sun-Jae Yoo, Se-Hee Hong, Doo-Yeol Yoo, Young-Soo Yoon
Ribbed carbon fiber reinforced polymer (CFRP) bars in ultra-high-performance fiber reinforced concrete (UHPFRC) are a high-efficiency combination for its sustainable substitute and high strength to weight ratio. This paper aims to investigate the bond stress and development length of ribbed CFRP bar embedded in UHPFRC using the hinged beam test. A total of 12 groups of hinged beam specimens were tested
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Improving degradation resistance of ensete ventricosum fibre in cement-based composites through fibre surface modification Cement Concrete Comp. (IF 10.5) Pub Date : 2023-12-08 Markos Tsegaye, Gulsen Nazerian, Michael El Kadi, Dimitrios G. Aggelis, Hubert Rahier, Tamene Adugna Demissie, Danny Van Hemelrijck, Tine Tysmans
In recent years, natural fibre cementitious composites (NFCC) have gained popularity worldwide because of their potential application as low-cost construction materials. Despite the wide range of applications for NFCC, their long-term performance, i.e., durability under various exposure conditions, remains an open question. Natural fibres in a cementitious matrix may degrade over time as a result of
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Evaluation of the biotransformation of alkali-silica reaction products by Alkalihalobacillus clausii and Bacillus thuringiensis Cement Concrete Comp. (IF 10.5) Pub Date : 2023-12-08 Domingos Jorge Ferreira da Silva, Kelly Cristina da Silva Brabes, Evaristo Alexandre Falcão
Currently, there are several ways to reduce the possibility of the occurrence of the alkali-silica reaction (ASR), when measures are adopted that attenuate the favorable conditions for its occurrence, avoiding possible damage to concrete structures. However, after ASR has been installed in the concrete structure, does not exist a completely efficient and economically viable solution that attenuate
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Double percolation phenomenon of carbon nanotube/cement composites as piezoresistivity sensing elements with exposure to salt environment Cement Concrete Comp. (IF 10.5) Pub Date : 2023-12-07 Xiaonan Wang, Decheng Feng, Jing Meng, Qinfei Li, Guanfu Wang, Xinman Ai, Pengjian Cheng, Kangwei Tang, Ning Xie
It has been known that the carbon nanotube (CNT)/cement composites can be used to reflect the external loading information and detect premature damage; however, the agreement on whether the piezoresistivity as a function of external loading is positive or negative has yet to be achieved, and the innate electrically conductive mechanism remains unclear. In this study, to minimize the application cost
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Effect of pore water pressure on mechanical performance of recycled aggregate concrete under triaxial compression Cement Concrete Comp. (IF 10.5) Pub Date : 2023-12-07 Yunan Li, Hanbing Zhao, Yong Hu, Fulin Qu, Dunming Zhu, Kejin Wang, Wengui Li
The pore water pressure in concrete can significantly increase due to volume compression. Recycled aggregate concrete (RAC) possesses a more complex microstructure compared to natural aggregate concrete (NAC). Understanding the porosity and micromechanical properties of RAC is crucial for analysing its failure mechanism under the influence of coupled confining pressure and pore water pressure. This
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Natural carbonation process in cement paste particles in different relative humidities Cement Concrete Comp. (IF 10.5) Pub Date : 2023-12-07 Naohiko Saeki, Luge Cheng, Ryo Kurihara, Takahiro Ohkubo, Atsushi Teramoto, Yuya Suda, Ryoma Kitagaki, Ippei Maruyama
Finely ground hardened cement pastes (hcp) under 75 μm were carbonated at varying relative humidities (23–95 % RH) to determine the carbonation rate that minimized CO2 diffusion in the bulk paste. The amounts of portlandite (CH) and calcium carbonate (CC) polymorphs were quantified, and the decalcification and decomposition of C-A-S-H were analyzed using TGA, XRD, mass balance calculation, FTIR, and
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Electrochemical behavior of zinc in alkali-activated fly ash solution Cement Concrete Comp. (IF 10.5) Pub Date : 2023-12-05 Wenxuan Li, Xiangdong Guan, Jinjie Shi
To study the passivation process and chloride-induced corrosion mechanism of galvanized steel in alkali-activated fly ash (AAFA) solution, pure zinc was chosen as the working electrode. Moreover, two other simulated concrete pore solutions, e.g., saturated Ca(OH)2 solution and ordinary Portland cement (OPC) solution were also tested for comparative purposes. Based on various electrochemical measurements
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A comparison of magneto-responsive particles and testing protocols for active rheology control of cementitious materials Cement Concrete Comp. (IF 10.5) Pub Date : 2023-12-05 Yiyuan Zhang, Karel Lesage, Yi Zhang, Yaxin Tao, Kim Van Tittelboom, Geert De Schutter
Magneto-responsive cementitious materials with magnetic interventions enable on-demand and real-time adjustment of rheology. This research aims to elaborate the early-stage magneto response of cement pastes using different types of Fe3O4 particles and carbonyl iron particles. A series of methods to evaluate the magnetorheological response of cementitious materials were established. The magneto-responsive
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Experimental and theoretical studies on the hydration of ordinary portland cement/calcium sulfoaluminate cement blends containing biological admixtures Cement Concrete Comp. (IF 10.5) Pub Date : 2023-12-05 Naru Kim, Joonho Seo, Hayeon Kim, H.K. Lee
The present study investigated the hydration properties of ordinary portland cement (OPC) and calcium sulfoaluminate (CSA) cement blends with the biological admixtures to examine the feasibility of the blends as a carrier for microbes, Sporosarcina pasteurii. The hydration kinetics of the blends were explored by X-ray powder diffractometry, thermogravimetry, and 27Al nuclear magnetic resonance analysis
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Electrochemical behavior of zinc in alkali-activated fly ash solution Cement Concrete Comp. (IF 10.5) Pub Date : 2023-12-05 Wenxuan Li, Xiangdong Guan, Jinjie Shi
To study the passivation process and chloride-induced corrosion mechanism of galvanized steel in alkali-activated fly ash (AAFA) solution, pure zinc was chosen as the working electrode. Moreover, two other simulated concrete pore solutions, e.g., saturated Ca(OH)2 solution and ordinary Portland cement (OPC) solution were also tested for comparative purposes. Based on various electrochemical measurements
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Role of encapsulated corrosion inhibitor on the anti-corrosion performance of reinforcing steel in lightweight concrete Cement Concrete Comp. (IF 10.5) Pub Date : 2023-12-04 Kuijiao Li, Haibing Zheng, Jian-Xin Lu, Weihua Li, Chi Sun Poon
This study aims to enhance the anti-corrosion performance of reinforcing steel in lightweight aggregate concrete (LAC) using lightweight aggregates (LWAs) to carry a corrosion inhibitor. To evaluate the effectiveness of the inhibitor firstly incorporated in the LWAs, the inhibition behaviors were monitored using electrochemical measurements and analyzed by microstructural characterization techniques
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Influence mechanism of Nano-SiO2 on geopolymer recycled concrete: Change mechanism of the microstructure and the anti-carbonation mechanism Cement Concrete Comp. (IF 10.5) Pub Date : 2023-11-28 Liu Yang, Zhiduo Zhu, Dingwen Zhang, He Sun, Wangwen Huo, Jie Zhang, Yu Wan, Chen Zhang
To improve the durability of geopolymer recycled aggregate concrete based on waste concrete powder (WCP), and realize its application and promotion, this study utilized WCP, fly ash (FA), and ground granulated blast-furnace slag (GGBS) as raw materials, and recycled concrete aggregate (RCA) as aggregate, with Nano-SiO2 as the modifying material to prepare WCP-based geopolymer recycled concrete (WCPGRC)
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The effect of temperature on dissolution activity of fly ash and metakaolin in alkaline conditions Cement Concrete Comp. (IF 10.5) Pub Date : 2023-11-29 Zongxian Huang, Qiang Wang
This paper studied the effect of temperature on dissolution activity of fly ash and metakaolin with different fineness. The dissolution experiment was conducted and the activation energy of Si and Al was calculated by shrinking core model. The result shows the specific surface areas of ground fly ash and metakaolin have increased by 50 % and 100 %, respectively, but their leaching ratio has only increased
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Reactivity of kaolinitic clays calcined in the 650 °C–1050 °C temperature range: Towards a robust assessment of overcalcination Cement Concrete Comp. (IF 10.5) Pub Date : 2023-12-02 Franco Zunino, Karen Scrivener
Using calcined clays as supplementary cementitious materials is one of the main solutions available for a substantial and widespread reduction of the clinker factor in cement. Thus, understanding the phenomena governing their production process and reactivity is crucial for a successful technological deployment. In this study, the mineralogical and physical changes experienced by kaolinitic clays calcined
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Microstructural analysis of cement paste blended with blast furnace slag using 1H NMR relaxometry Cement Concrete Comp. (IF 10.5) Pub Date : 2023-11-30 Shiju Joseph, Marcello Mutti, Takahiro Ohkubo, Ippei Maruyama, Özlem Cizer
1H NMR is a powerful technique for characterizing the microstructure of cement pastes; however the analysis of the data poses significant challenges. This work presents a comparative analysis of the microstructure evolution in cement pastes using 1H NMR relaxometry, MIP and thermoporometry. We developed and implemented a cumulative T2 distribution to improve the reproducibility and robustness of the
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Diffusion-reaction models for concrete exposed to chloride-sulfate attack based on porosity and water saturation Cement Concrete Comp. (IF 10.5) Pub Date : 2023-12-02 Zhijie Zhuang, Song Mu, Zheng Guo, Guangyan Liu, Jinfei Zhang, Changwen Miao
Reinforced concrete structures in an unsaturated state experiences significant degradation when exposed to combined chloride and sulfate attack in marine environments. For evaluating durability and predicting service life of reinforced structures, it is crucial to better understand ions diffusion, porosity variation and water saturation of concrete. Considering effect of porosity and water saturation
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Influence of quicklime and Portland cement, as alkaline activators, on the microstructure of reaction products of supersulfated pumice-based cements Cement Concrete Comp. (IF 10.5) Pub Date : 2023-11-30 K. Cabrera-Luna, P. Perez-Cortes, J.I. Escalante Garcia
The influence of quicklime and Portland cement, as alkaline activators, on the microstructure, chemical, mineralogical composition and structure of the reaction products of supersulfated cements based on anhydrate-sulfate activated pumice (SSC-PM) was investigated. The alkaline activator influences the type and amount of hydration products, which in turn affects the microstructure and mechanical properties
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A review on corrosion of cement-based materials in CO2-rich karst groundwater Cement Concrete Comp. (IF 10.5) Pub Date : 2023-11-28 Shuqing Zhang, Jianhui Liu, Leping Liu, Zheng Chen, Caijun Shi
In karst areas, groundwater has high concentrations of carbon dioxide. It causes decalcification of cement-based materials by reacting with calcium hydroxide and calcium silicate hydrate. Therefore, the corrosion by CO2-rich groundwater has become a significant concern as it may reduce the service life of concrete structure. Based on the chemical reactions, the corrosion can be divided into leaching
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Effect of shear reinforcement and external strengthening with strain-hardening cement-based composites (SHCC) on the impact resistance of reinforced concrete beams Cement Concrete Comp. (IF 10.5) Pub Date : 2023-11-22 Tathiana Caram S.P. Figueiredo, Marcus Hering, Iurie Curosu, Franz Bracklow, Silke Scheerer, Manfred Curbach, Viktor Mechtcherine, Flávio de Andrade Silva
The paper presents a series of impact experiments performed on reinforced concrete (RC) beams with and without stirrups and additionally without and with lateral strengthening layers made of two types of strain-hardening cement-based composites (SHCC). The impact tests were performed in an advanced drop tower facility with accelerated steel projectiles. Four impact velocities were applied, ranging
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An approach to develop set-on-demand 3D printable limestone-calcined clay-based cementitious materials using calcium nitrate Cement Concrete Comp. (IF 10.5) Pub Date : 2023-11-23 Yu Chen, Hossein Rahmani, Erik Schlangen, Oğuzhan Çopuroğlu
The implementation of extrusion-based 3D concrete printing (3DCP) in large-scale constructions is currently limited by concerns regarding rheology control and the sustainability of this process. To address these issues, this study presents an approach to develop limestone-calcined clay-based cementitious (LC3) materials accelerated by Ca(NO3)2 solution in an inline static mixer-based 3DCP setup. Using
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Insights on the chloride adsorption stability in cement mortar under current field and sulfate attack: From experiments to molecular dynamics simulation Cement Concrete Comp. (IF 10.5) Pub Date : 2023-11-27 Ke-yu Chen, Jin Xia, Shi-qi Wang, Ren-jie Wu, Wan-lin Min, Jing-yu Wei, Dong-shuai Hou, Song Mu
The destabilization together with boundary chloride ions releasing leads to the corrosion of steel bars, posing nonnegligible risks to the durability of structures. This work attempted to design the typical pore solution of underground constructions via methods of combining NaCl with Na2SO4 along with conducting a stray current continuously. The bound chloride stability of mortar under the action of
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Synergistic effect of characteristics of raw materials on controlling the mechanical properties of fly ash-based geopolymers Cement Concrete Comp. (IF 10.5) Pub Date : 2023-11-21 Xiaonan Ge, Xiang Hu, Huang Li, Caijun Shi
This study investigates the macro- and micro-characteristics of the geopolymers to verify the feasibility of prediction of compressive strength via quantitatively adjusting the amorphous phase content (APC) and particle size distribution (PSD) of raw material. The optimization of PSD through the sieving method does not reach the intended compressive strength compared to the reference, while controlling
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Understanding the formation and structure of bio-mineralization for self-healing of marine concrete: An experimental and thermodynamic approach Cement Concrete Comp. (IF 10.5) Pub Date : 2023-11-22 Jing Xu, Xianzhi Wang, Wu Yao, Qing Chen, Hehua Zhu, Surendra P. Shah
In marine engineering, infrastructures are facing serious issues of deterioration resulted largely from concrete cracking due to the hostile seawater environment. Microbial induced carbonate precipitation (MICP) is an effective and environmentally friendly way to achieve self-healing of concrete cracks. However, the formation and structure of MICP products for crack healing in seawater remain unclear
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Development and verification of an integrated hydration, geochemical and transport model for the hydrated cement paste exposed to an aggressive chemical environment Cement Concrete Comp. (IF 10.5) Pub Date : 2023-11-25 Siventhirarajah Krishnya, Kirushnapillai Kopitha, Yuya Yoda, Ryoma Kitagaki, Yogarajah Elakneswaran
This study established a new transport model by using the COMSOL-IPHREEQC interface to simulate the changes in the morphology of hydrated cement paste due to the diffusion of carbon dioxide and chloride ion. A series of constitutive models such as the cement hydration model (to compute the dissolution rate of each clinker mineral), thermodynamic model (to perform the hydration reaction, reaction due
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Superabsorbent polymer in alkali-activated slag paste: Swelling-deswelling behaviour and effects on surrounding matrix Cement Concrete Comp. (IF 10.5) Pub Date : 2023-11-19 Jiawei Tan, Beibei Sun, Zhenming Li
Superabsorbent polymer (SAP) has been applied in alkali-activated slag (AAS) for internal curing, but its interaction mechanism remains unclear. This study employed SAP of a large size (∼2mm) to achieve in-situ and continuous observation of SAP behaviors in AAS paste and their impacts on the surrounding matrix for 90 days. Results showed that SAP in AAS exhibited different dynamics over time: swelling
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Self-healing and rebar corrosion performance of cracked engineered cementitious composites exposed to wet coral sand environment Cement Concrete Comp. (IF 10.5) Pub Date : 2023-11-22 Zhenbo Wang, Peng Sun, Yurun Fan, Yudong Han, Yudong Hu
Wet coral sand environment on islands and reefs features high humidity and abundance in aggressive fluids and gases, thus posing a great threat to the durability of reinforced concrete structures. In this study, engineered cementitious composites (ECCs) with strain-hardening and self-healing characteristics are proposed as a potential cover material in wet coral sand exposure. The autogenous self-healing
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Controlling electromagnetic and mechanical behaviors of geopolymer matrix with nano-SiO2@Fe3O4 magnetofluid for soft magnetic applications Cement Concrete Comp. (IF 10.5) Pub Date : 2023-11-22 Gonghui Gu, Tao Ma, Feng Chen, Chengjia Han, Heng Li, Fang Xu
Nano-SiO2@Fe3O4 magnetofluid modified geopolymer (NMMG) is presenting promising application potential in the field of magnetic building materials by virtue of its high magnetic permeability. This work aims to reveal the modification mechanisms of nano-SiO2@Fe3O4 magnetofluid on the electromagnetic and mechanical behaviors of geopolymer matrix, thus providing theoretical guidance for the engineering
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Recent development of innovative steel fibers for ultra-high-performance concrete (UHPC): A critical review Cement Concrete Comp. (IF 10.5) Pub Date : 2023-11-17 Doo-Yeol Yoo, Nemkumar Banthia, Young-Soo Yoon
This paper presents a comprehensive review of recent advancements in innovative high-strength steel fibers for ultra-high-performance concrete (UHPC). Firstly, commercially available ordinary steel fibers for UHPC products are introduced, and the analysis of fiber aspect ratio on the mechanical properties of UHPC follows. Subsequently, the historical development of deformed steel fibers, including
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Preface to special issue on: Low-Carbon Cement Composites (LCCC) Cement Concrete Comp. (IF 10.5) Pub Date : 2023-11-18 Zhengwu Jiang, Maria Juenger, Manu Santhanam
Abstract not available
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Synergistic inhibition of molybdate and phytate on chloride-induced corrosion of carbon steel in simulated concrete pore solutions Cement Concrete Comp. (IF 10.5) Pub Date : 2023-11-19 Yongqi Liu, Xiangdong Guan, Jinjie Shi
Improving the corrosion resistance of reinforcing steel is particularly important to prolong the service life of reinforced concrete (RC) structures. This study proposes a novel mixed corrosion inhibitor of sodium molybdate and sodium phytate to enhance the corrosion resistance of Q235 carbon steel in concrete exposed to aggressive environments. Based on the synergistic inhibition of the mixed corrosion
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Mechanical and durability properties of structural grade heavy weight concrete with fly ash and slag Cement Concrete Comp. (IF 10.5) Pub Date : 2023-11-17 Venkatachalapathy Venkitasamy, Manu Santhanam, B.P.C. Rao, S. Balakrishnan, Anish Kumar
The paper investigates the fundamental mechanical and durability properties of a M50 strength grade heavy weight concrete (HWC), with replacement of cement by fly ash at 15 %, 25 % and 35 % levels and slag at 40 %, 50 % and 60 % levels. The mechanical properties studied include compressive strength, elastic modulus, flexural and split tensile strengths, and the durability properties include water permeability
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Healing capacity of Ultra High Performance Concrete under sustained through crack tensile stresses and aggressive environments Cement Concrete Comp. (IF 10.5) Pub Date : 2023-11-14 Bin Xi, Zhewen Huang, Salam Al-Obaidi, Liberato Ferrara
This study investigates the self-healing capabilities of Ultra-High Performance Concrete (UHPC) under the combined influence of mechanical and environmental factors. Specifically, it delves into the long-term self-healing process in pre-cracked UHPC samples that endure continuous sustained tensile stresses across the cracks and are exposed to aggressive environmental conditions for one year. The results
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Ti3C2Tx MXene modified polyethylene fibers for enhancing interface properties of strain-hardening cementitious composites Cement Concrete Comp. (IF 10.5) Pub Date : 2023-11-14 Zhichao Xu, Huayang Sun, Yanlin Huo, Minjie Jia, Zhitao Chen, Yingzi Yang
MXene is a new two-dimensional transition metal carbide/nitride with remarkable hydrophilicity, which has been widely applied in multifunctional coatings. In this study, Ti3C2Tx MXene was synthesized by LiF/HCl solution etching of Ti3AlC2 and used to modify the surface of polyethylene (PE) fiber, enhancing the interfacial properties between fiber and matrix and further improving the tensile properties
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Internal curing and its application to alkali-activated materials: A literature review Cement Concrete Comp. (IF 10.5) Pub Date : 2023-11-14 Jingbin Yang, Zhenping Sun, Nele De Belie, Didier Snoeck
Alkali-activated materials (AAM) are considered as promising alternative to Portland cement, as they can utilize industrial by-products or wastes as precursors and contribute to reducing CO2 emissions. However, poor volume stability, especially in the case of alkali-activated slag (AAS) systems, remains a significant obstacle in their large-scale application. In recent years, internal curing has gained
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High-purity vaterite CaCO3 recovery through wet carbonation of magnesium slag and leaching residue utilization in cement Cement Concrete Comp. (IF 10.5) Pub Date : 2023-11-11 Bao Lu, Yeqiang Zhou, Lei Jiang, Zhensen Liu, Guihua Hou
This work turned industrial waste of magnesium slag (MS) into two value-added products, high-purity vaterite and supplementary cementitious materials, through “leaching-carbonation” method. The various parameters on the leaching rate of Ca2+ from MS by using NH4Cl solution were investigated. The spherical vaterite with high purity of 96.5 % and high surface area (27.89 m2/g) could be successfully produced
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Use of CO2 as a controlled foam stabilizer to enhance pore structure and properties of foamed concrete Cement Concrete Comp. (IF 10.5) Pub Date : 2023-11-11 Yiming Zhang, Yi Jiang, Tung-Chai Ling
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Synergistic effect of CO2-mineralized steel slag and carbonation curing on cement paste Cement Concrete Comp. (IF 10.5) Pub Date : 2023-11-11 Linshan Li, Tiefeng Chen, Xiaojian Gao
Cement-based materials have favorable capacity of solid waste and CO2 disposal. In this study, a synergistic CO2 treatment, including CO2 mineralization of steel slag admixture and carbonation curing of cement paste, was proposed. The influence of synergistic CO2 treatment on pozzolanic activity of steel slag, CO2 sequestration, and compressive strength of specimens were investigated. Results show