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Fast vapour migration next to a depressurizing interface: A possible driving mechanism of explosive spalling revealed by neutron imaging Cem. Concr. Res. (IF 11.4) Pub Date : 2024-04-17 Roberto Felicetti, Ramin Yarmohammadian, Stefano Dal Pont, Alessandro Tengattini
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Uptake of chloride and isosaccharinic acid by cement paste with high slag content (CEM III/C) Cem. Concr. Res. (IF 11.4) Pub Date : 2024-04-16 Yongheum Jo, Barbara Lothenbach, Neşe Çevirim-Papaioannou, Benny de Blochouse, Marcus Altmaier, Xavier Gaona
The uptake of chloride (Cl) and isosaccharinic acid (ISA, main degradation product of cellulose) by cement paste with high slag content (CEM III/C) was investigated with batch sorption experiments with Cl and inactive ISA. A weak uptake of chloride was quantified (0.43 ≤ R [L∙kg] ≤ 5.8), consistently with previous observations for Portland cement. C-S-H, AFm and hydrotalcite are suggested as primary
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Water-based graphene nanofluid additives: Advancements in sustainable, low-carbon, and high-performance nanocarbon-modified cementitious materials Cem. Concr. Res. (IF 11.4) Pub Date : 2024-04-16 Chun Pei, Si-cheng Kong, Ming-Zhi Guo, Ji-Hua Zhu
Advancing carbon neutrality in construction demands innovative, low-carbon, high-performance cement composites. This study introduces a water-stable graphene nanofluid admixture (GNA) at a 13 g/L concentration, addressing challenges in nanomaterial processing, dispersion, and cost for large-scale civil engineering. GNA can replace water in concrete casting, aligning with engineering practices. The
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Evolution of silicate species from waterglass in waterglass activated slag (WAS) pastes at early age Cem. Concr. Res. (IF 11.4) Pub Date : 2024-04-15 Dongdong Jiang, Zuhua Zhang, Caijun Shi
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Multiple cracking and strain-hardening criteria of Engineered Cementitious Composites (ECC) with river sand Cem. Concr. Res. (IF 11.4) Pub Date : 2024-04-13 Yazhao Li, Junxia Li, En-Hua Yang, Xinchun Guan
The inclusion of river sand in ECC alters the crack initiation and propagation behavior. As a result, the multiple cracking and pseudo strain-hardening of the river sand ECC (RS-ECC) are different from that of the typical micro-silica sand ECC. This study investigates the strain-hardening criteria for the RS-ECC by considering the matrix as a three-phase material containing pre-existing flaws along
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Combined effect of natural fibre and steel fibre on the thermal-mechanical properties of UHPC subjected to high temperature Cem. Concr. Res. (IF 11.4) Pub Date : 2024-04-13 Maha M.S. Ridha
This research investigates the combined effect of steel and natural fibre on the mechanical properties and spalling resistance of ultra-high performance concrete (UHPC) before and after exposure to elevated temperatures. The effects of two parameters, namely temperature (ambient temperature, 200 °C, 400 °C and 600 °C) and fibre type (solely macro end hooked steel fibre (MHS) and hybrid of micro straight
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A rheometric approach to assess plastic shrinkage and implications of early age drying on the microstructure of cement-based materials Cem. Concr. Res. (IF 11.4) Pub Date : 2024-04-12 Manu K. Mohan, A.V. Rahul, Yury Villagran-Zaccardi, Geert De Schutter, Kim Van Tittelboom
3D printed cementitious materials are subjected to environmental drying from a very early age as it does not have any formwork protection. In this paper, we present a novel methodology using a rheometer for measuring the shrinkage strains in such stiff cement-based materials from the onset of processing. In this approach, cylindrical samples are placed between parallel plates attached to the rheometer
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A microstructure-based model for quantifying irreversible yield stress evolution in cement-based pastes during hydration Cem. Concr. Res. (IF 11.4) Pub Date : 2024-04-11 Xiuliang Yin, Zhijun Wu, Lei Weng, Xiangyu Xu, Yuan Zhou, Quansheng Liu
Investigating workability loss in cement-based pastes during hydration, primarily marked by an irreversible yield stress increase, is crucial for cement-based materials application and development. This paper presents a model for quantifying the irreversible yield stress evolution by incorporating microstructural changes involving physical, chemical, and physicochemical effects. By systematically integrating
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Regulation of mineral formation of iron-rich calcium sulfoaluminate clinker by controlling SO3 and Fe2O3 contents Cem. Concr. Res. (IF 11.4) Pub Date : 2024-04-11 Yonggang Yao, Shuang Wu, Xujiang Wang, Ziliang Zhang, Renjie Mi, Zhijuan Hu, Zengmei Wang, Wenlong Wang
This study systematically investigates the effects of SO and FeO variations in the raw mix on the mineral phase formation, transformation and regulation of iron-rich calcium sulfoaluminate (CSA) clinker. The findings reveal that excess SO can simultaneously facilitate the formation of CAS̅ phase and CS phase. Moreover, elevated levels of SO also enhance ions substitution within different mineral phases
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Intrinsic chloride ion transport behavior in porous space of pure C-S-H Cem. Concr. Res. (IF 11.4) Pub Date : 2024-04-09 Lianyao Xiong, Zhe Zhang, Yuchen Hu, Guoqing Geng
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A kinetic Monte Carlo study of the C[formula omitted]S dissolution mechanism Cem. Concr. Res. (IF 11.4) Pub Date : 2024-04-09 Pablo Martin, Juan J. Gaitero, Xabier M. Aretxabaleta, Mohammad Javad Abdolhosseini Qomi, Hegoi Manzano
Understanding the mechanism that controls cement hydration and its stages is a long-standing challenge. Over a decade ago, the mineral dissolution theory was adopted from geochemistry to explain the hydration rate evolution of alite. The theory is not fully accepted by the community and deserves further investigation. In this work, we apply Kinetic Monte Carlo (KMC) simulations with the mineral dissolution
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Critical strain measurements of hydrating Portland cement pastes: A new understanding of microstructure development Cem. Concr. Res. (IF 11.4) Pub Date : 2024-04-09 Palash Badjatya, Shiho Kawashima
Small amplitude oscillatory sweep (SAOS) techniques have been identified as valuable non-destructive methods to investigate the microstructure of cement pastes, but relatively few studies exist in the literature. Moreover, these studies focused primarily on the evolution of storage modulus over time, while change in the critical strain parameter has remained unexplored. In this investigation, an ordinary
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A new accelerated testing scheme to evaluate the potential oxidation reaction of sulfide-bearing aggregates in concrete specimens Cem. Concr. Res. (IF 11.4) Pub Date : 2024-04-08 R. Castillo Araiza, A. Rodrigues, B. Fournier, J. Duchesne
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Weaving the next-level structure of calcium silicate hydrate at the submicron scale via a remapping algorithm from coarse-grained to all-atom model Cem. Concr. Res. (IF 11.4) Pub Date : 2024-04-05 Ao Zhou, Juntao Kang, Renyuan Qin, Huali Hao, Tiejun Liu, Zechuan Yu
The submicron scale is a critical bridge connecting the nanoscale molecular dynamics simulations to the microscale mechanical experiments like nanoindentation. Here we present a modeling algorithm for submicron structure of calcium silicate hydrate (C-S-H). The algorithm remaps coarse-grained C-S-H models back to all-atom models through Voronoi analysis on packing of disk-like units. The obtained all-atom
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Accelerated carbonation of recycled concrete aggregate in semi-wet environments: A promising technique for CO2 utilization Cem. Concr. Res. (IF 11.4) Pub Date : 2024-04-04 Yining Gao, Yi Jiang, Yong Tao, Peiliang Shen, Chi Sun Poon
The practical implementation of accelerated carbonation for recycled waste concrete is impeded by sluggish carbonation efficiency. In contrast to previous carbonation enhancement schemes using high-pressure gas and/or complex pre-/post-processing, this study introduces a novel semi-wet carbonation method that achieves high-efficiency carbonation of recycled concrete aggregates (RCA) in a practically
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Computational multiscale modelling of thermally induced dehydration of blended hardened cement paste Cem. Concr. Res. (IF 11.4) Pub Date : 2024-04-04 Simon Peters, Günther Meschke
A multiscale model able to describe the dehydration behaviour in terms of mass loss, porosity increase and Young’s modulus degradation of blended cement pastes at elevated temperatures is proposed. The cement composition and the heating rate are the input of the model. Known stoichiometric chemical dehydration formulas and kinetics of each hardened cement constituent are used to predict the water release
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Residual mechanical properties of high strength concrete BBR9 subjected to dynamic uniaxial compressive loading Cem. Concr. Res. (IF 11.4) Pub Date : 2024-04-03 Mohamed A. Abbas, Brett A. Williams, William F. Heard, Xu Nie
In recent years, enormous efforts have been devoted to accurately quantifying the residual load-bearing capacity of concrete at the material level when exposed to elevated temperatures. However, relatively less attention has been given to investigating the effects of dynamic events such as terrorist attacks, earthquakes, and hurricanes, which can cause complete collapse of concrete structures and have
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Distribution of sulphate and aluminium in hydrated cement pastes Cem. Concr. Res. (IF 11.4) Pub Date : 2024-04-01 Petter Hemstad, Barbara Lothenbach, Klaartje De Weerdt
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Novel multi-scale experimental approach and deep learning model to optimize capillary pressure evolution in early age concrete Cem. Concr. Res. (IF 11.4) Pub Date : 2024-03-29 Armin Jamali, Afshin Marani, James Railton, Moncef L. Nehdi, Brabha Nagaratnam, Michael Lim, Joao Mendes
Early-age shrinkage of concrete can initiate pre-mature cracking, which can compromise the durability of concrete structures. Monitoring capillary pressure, the leading cause of concrete shrinkage, and understanding its evolution is crucial for the performance-based design of concrete, particularly at early-stages when it is more prone to cracking. This study deploys an innovative multi-scale experimental
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Unified hydration model for multi-blend fly ash cementitious systems of wide-range replacement rates Cem. Concr. Res. (IF 11.4) Pub Date : 2024-03-28 Yuguo Yu, Chamila Gunasekara, Yogarajah Elakneswaran, Dilan Robert, David W. Law, Sujeeva Setunge
Developments of binary, ternary, and even quaternary cementitious binder materials have been widely recognised in research and practices to elevate the sustainability of modern construction industry. To this end, a robust method to predict the hydration of novel binder systems is essential to facilitate informed material designs, yet extremely lacking. In this study, focusing on fly ash cement binders
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Synthesis, solubility and thermodynamic properties of N-A-S-H gels with various target Si/Al ratios Cem. Concr. Res. (IF 11.4) Pub Date : 2024-03-28 Yun Chen, Luiz Miranda de Lima, Zhenming Li, Bin Ma, Barbara Lothenbach, Suhong Yin, Qijun Yu, Guang Ye
The synthesis of N-A-S-H gel with high Si/Al ratios (>2) has been rarely reported in the literature, leaving the establishment of a reliable synthesis route as an open challenge. This paper aims to synthesize N-A-S-H gels with Si/Al ratios ranging from 1 to 3 and establish their thermodynamic database. The effects of reaction temperature, reaction time, initial Si/Al, concentration of reactants and
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Encapsulation of iodine-loaded adsorbents in blended Portland cement and geopolymer wasteforms Cem. Concr. Res. (IF 11.4) Pub Date : 2024-03-26 Marco Simoni, Sarah A. Kearney, Thomas J. Robshaw, Joshua Turner, Kyle O'Donoghue, Daniel A. Geddes, Clint A. Sharrad, Mark D. Ogden, Brant Walkley
Capture of radioiodine by solid adsorbents and subsequent cementation is a promising solution to achieve “Near Zero” emissions from nuclear fuel cycles. We investigate cementation of iodine-loaded silica adsorbents in blast furnace slag blended Portland cement (BFS:PC) and metakaolin-based geopolymers, and subsequent leaching in deionised water. Adsorbent encapsulation retarded BFS:PC hydration, but
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Effect of maximum packing fraction of powders on the rheology of metakaolin-based geopolymer pastes Cem. Concr. Res. (IF 11.4) Pub Date : 2024-03-25 Yasemin Keskin-Topan, Hela Bessaies-Bey, Laurent Petit, Nhu-Cuong Tran, Jean-Baptiste d'Espinose de Lacaillerie, Sylvie Rossignol, Nicolas Roussel
In this work, we study the effect of maximum packing fraction of powders on the rheology of geopolymer pastes. A large range of metakaolin powders is generated either by blending or grinding powders. Blends of metakaolin with quartz and limestone are also studied. We show that the compressive packing model is able to predict correctly over a wide range of values the maximum packing fraction of these
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Neutron radiography with simultaneous deformation measurements demand rethinking the modelling of imbibition in cement paste Cem. Concr. Res. (IF 11.4) Pub Date : 2024-03-21 Natalia Mariel Alderete, Yury Villagrán-Zaccardi, Yasmina Shields, Philip Van den Heede, María Paula Zappitelli, Ravi Patel, Balša Jovanović, Pavel Trtik, Nele De Belie
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A cement hydration kinetics model and its application in designing cement formulation for natural gas hydrate well Cem. Concr. Res. (IF 11.4) Pub Date : 2024-03-20 Yucheng Xue, Chengwen Wang, Jingping Liu, Jinsheng Sun, Zehua Chen, Yuanbo Xia, Longqiao Chen, Echuan Wang, Yinjie Li
To guide the research and development of cement slurries with low hydration heat release for natural gas hydrates (NGHs), the effects of fly ash (FA) and phase-change material (PCM) on the early performance of cement at low temperatures were investigated using isothermal calorimetry (IC), semi-adiabatic temperature (ST), and mechanical strength tests. A specialized in-house device was designed to simulate
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How the materials knowledge of Roman mortars could be helpful for the production of future materials: The case of the Aqua Traiana aqueduct (Rome, Italy) Cem. Concr. Res. (IF 11.4) Pub Date : 2024-03-04 Laura Medeghini, Laura Calzolari, Sara Capriotti, Martina Bernabale, Caterina De Vito, Mauro Giustini, Ida Pettiti, Gianfranco Dell'Agli, Luca Spiridigliozzi, Amina Antonacci, Giulia Gasperuzzo, Viviana Scognamiglio, Valeria Di Tullio, Margherita Zappelli, Lucia Conti, Eleonora Gioventù, Marina Marcelli, Alfredo Bonaccini, Silvano Mignardi
Starting from the knowledge of ancient materials, the present work aims at developing green eco-friendly restoration mortars.
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Role of thixotropy in interlayer microstructure and properties of additively manufactured cementitious materials Cem. Concr. Res. (IF 11.4) Pub Date : 2024-03-04 Yun-Chen Wu, Xinbo Wang, Mo Li
This study revealed the relationship among early-age thixotropic behavior, air-phase microstructure, and fracture properties of the interlayer region in additively manufactured (AM) cementitious materials. Cementitious materials were designed and characterized to possess distinctive rheological properties and were additively manufactured into cementitious specimens. The effects of thixotropy and printing
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Four-way CFD-DEM coupling to simulate concrete pipe flow: Mechanism of formation of lubrication layer Cem. Concr. Res. (IF 11.4) Pub Date : 2024-03-03 Tooran Tavangar, Masoud Hosseinpoor, Jeffrey S. Marshall, Ammar Yahia, Kamal H. Khayat
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A conceptual model for numerical simulation of Active Rheology Control validated for cementitious pumping Cem. Concr. Res. (IF 11.4) Pub Date : 2024-03-01 Robin De Schryver, Dengwu Jiao, Mert Yücel Yardimci, Karel Lesage, Geert De Schutter
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The glassy structure of reactive supplementary cementitious materials (SCMs) and recycled glass: Contribution of XRD and Raman spectroscopy to their characterization Cem. Concr. Res. (IF 11.4) Pub Date : 2024-02-28 Théodore Serbource, Mireille Courtial, Marie-Noëlle de Noirfontaine, Sandrine Tusseau-Nenez, Christophe Sandt, Laurent Izoret
This study compares thirteen natural and industrial samples of supplementary or emerging supplementary cementitious materials (SCMs): slag, fly ashes, pozzolan, obsidian, silica fume, and recycled glass. These materials are used or are under consideration for decarbonization in cement plants. XRF, XRD and Raman microspectroscopy were used in order to achieve a deeper understanding of the structural
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Stability of calcium silicate hydrates produced by alite hydration at high and ultrahigh temperatures Cem. Concr. Res. (IF 11.4) Pub Date : 2024-02-28 Fang Sun, Xueyu Pang, Jianqiang Wei, Thomas Matschei, Lijun Sun, Yongjin Yu, Haige Wang, Jinsheng Sun
The influence of initial curing temperature on the stability of calcium silicate hydrates (C-S-H) produced by alite hydration in the temperature range of 110 °C–240 °C was investigated. Test results showed that, alite pastes directly cured under high temperatures yielded dramatically faster crystallization of C-S-H compared to those precured at a low temperature of 80 °C before the high temperature
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Abrasion-wear resistance of precarbonated and water-cured concrete made using ABS plastic derived from waste electrical and electronic equipment Cem. Concr. Res. (IF 11.4) Pub Date : 2024-02-28 Lewis A. Parsons, Sunday O. Nwaubani
Due to the fast proliferation of electrical and electronic equipment (PCs, TVs, and cell phones, among others), the disposal of plastic waste, such as acrylonitrile butadiene styrene derived from discarded electrical and electronic equipment (e-Waste), is becoming a big issue. This paper addresses this subject by utilising granulated ABS as an aggregate replacement material in concrete. The compressive
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In situ synchrotron powder diffraction study of LC3 cement activation at very early ages by C-S-H nucleation seeding Cem. Concr. Res. (IF 11.4) Pub Date : 2024-02-22 Alejandro Morales-Cantero, Angeles G. De la Torre, Ana Cuesta, Isabel Santacruz, Isabel M.R. Bernal, Oliver Mazanec, Alessandro Dalla-Libera, Pere Borralleras, Miguel A.G. Aranda
Limestone Calcined Clay Cements, LC, are being widely researched as low-carbon binders. However, the hydration reactions during the first day are key for their performances and they were not well known. Here, we employ synchrotron X-ray powder diffraction to understand the hydration reactions that take place during the first day. The influence of two superplasticisers and three strength-enhancing admixtures
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Effect of gypsum on hydration properties, composition and kinetics of low carbon belite-ye'elimite-Q phase-ferrite clinker Cem. Concr. Res. (IF 11.4) Pub Date : 2024-02-22 Minwang Lv, Lu Yang, Fazhou Wang, Shuguang Hu, Haoxuan Zhong, Mai Zhang, Jianhui He
In this study, a new low-carbon clinker, belite-ye'elimite-Q phase-ferrite (BYQF), was produced and hydrated with and without gypsum at 8 %, 15 % and 30 % mass concentrations. The results show an optimum compressive strength of 122 MPa (90 days) with 30 wt% gypsum addition. The gypsum content determines the development of the compressive strength, which can be increased by 30 % to 105 % due to the
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Influence of calcination temperature on the physical and chemical characteristics of kaolinitic clays for use as supplementary cementitious materials Cem. Concr. Res. (IF 11.4) Pub Date : 2024-02-21 Mehnaz Dhar, Shashank Bishnoi
Clays have the potential of being the most important supplementary cementitious material for the future. The quality of calcination, which has a very important influence on the suitability of clay as a partial replacement of cement, is influenced by the changes in the characteristics of clays during calcination. An improved knowledge of these changes can help to assess the suitability of clays. In
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Magnesium silicate hydrate (M-S-H) stability under carbonation Cem. Concr. Res. (IF 11.4) Pub Date : 2024-02-20 Ellina Bernard, Hoang Nguyen
This work offers in-depth understanding about the behavior of different M-S-H phases under carbonation. Here, we carbonated 8-year-old M-S-H samples under i) wet carbonation and ii) dried or steamed pressurized CO. Both solid and liquids samples were analyzed using various techniques while thermodynamic modelling was coupled to shed light on the response of M-S-H phases under carbonation. We found
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Effect of SiO2-modified calcined layered double hydroxides on the properties of cement-based material: Crucial role of the phase-transformation induced by alkaline pore solution Cem. Concr. Res. (IF 11.4) Pub Date : 2024-02-20 Junran Liu, Xiaojian Gao, Tiefeng Chen
Calcined layered double hydroxides (CLDH) and nano-SiO are commonly added to cement-based materials to enhance their resistance against chloride ions (Cl) and mechanical performance, respectively. In this work, the CLDH and nano-SiO were combined to synthesize SiO@CLDH, aiming for a synergistic effect between the two materials. The deposition of nano-SiO on the CLDH substrate enhanced the utilization
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Hydrothermal synthesis of sodium silicate from rice husk ash: Effect of synthesis on silicate structure and transport properties of alkali-activated concrete Cem. Concr. Res. (IF 11.4) Pub Date : 2024-02-19 Mohammed Fouad Alnahhal, Abdelrahman Hamdan, Ailar Hajimohammadi, Arnaud Castel, Taehwan Kim
Alkali-activated materials (AAMs) are increasingly being researched to reduce the reliance on conventional cements as building materials. However, expensive and energy-intensive alkaline activators curtail the usage of AAMs. Waste-derived alkaline activators are effective in mitigating the environmental concerns for alkaline activators, but their synthesis process and the transport properties of AAM
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A critical review of magnesium silicate hydrate (M-S-H) phases for binder applications Cem. Concr. Res. (IF 11.4) Pub Date : 2024-02-17 Harisankar Sreenivasan, Ellina Bernard, Hellen S. Santos, Hoang Nguyen, Samira Moukannaa, Adeolu Adediran, John L. Provis, Paivo Kinnunen
Hydrated magnesium silicate materials are promising binding materials for applications as alternative cementitious materials and may offer a lower carbon footprint than conventional binders if carbon-free feedstocks are used. The reaction of reactive MgO with silica sources yields magnesium silicate hydrate (M-S-H) phases. These M-S-H phases have layered silicate structure and are stable from pH 8
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Surface properties of clinker phases and clay minerals characterized by inverse gas chromatography (IGC) and their link to reactivity Cem. Concr. Res. (IF 11.4) Pub Date : 2024-02-16 Franco Zunino, Marta Palacios, Paul Bowen, Karen Scrivener
This paper presents a preliminary study of the characterization of the surface energy properties of clinker phases (CS and CA), kaolin and metakaolin by Inverse Gas Chromatography (IGC). For this, a reliable measurement methodology was developed. By looking at changes in the whole series of results (dispersive surface energy, specific polar interaction parameter, acid and base constants, morphology
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A damage constitutive model for concrete under uniaxial compression capturing strain localization Cem. Concr. Res. (IF 11.4) Pub Date : 2024-02-12 Yanpeng Wang
This paper presents a damage constitutive equation capturing the feature of strain localization and, on this basis, proposes a novel damage constitutive model for concrete under uniaxial compression. It is found that the proposed model can better simulate the stiffness degradation behavior of concrete under cyclic loading, well reproduce the dependency of the post-peak stress-strain curve on specimen
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Numerical analysis of concrete permeability measurements in laboratory and in field Cem. Concr. Res. (IF 11.4) Pub Date : 2024-02-07 Stéphane Multon, Jérôme Verdier, Hugo Cagnon, Alexandre Nehme, Hognon Sogbossi
This paper addresses the challenge of evaluating the air permeability of structural concrete in situ, using non-destructive techniques. Specifically, it aims to reconcile air permeability measurements made in the field with those made in the laboratory. Permeability measurements in the laboratory and in the field use both under pressure and in vacuum techniques in steady or unsteady states. Differences
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Chemical degradation of magnesium potassium phosphate cement pastes during leaching by demineralized water: Experimental investigation and modeling Cem. Concr. Res. (IF 11.4) Pub Date : 2024-02-07 Laura Diaz Caselles, Céline Cau Dit Coumes, Pascal Antonucci, Angélique Rousselet, Adel Mesbah, Valérie Montouillout
The long-term durability of magnesium potassium phosphate cement (MKPC) pastes was investigated by examining their leaching behavior. MKPC comprised magnesium oxide (MgO) and potassium dihydrogen phosphate (KHPO) in equimolar amounts and yielded K-struvite (MgKPO·6HO) and a nearly neutral pore solution pH upon hydration. Semi-dynamic leaching tests were performed on MKPC paste samples using demineralized
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Editorial - Intelligently designing cement and concrete through data analytics Cem. Concr. Res. (IF 11.4) Pub Date : 2024-02-06 Newell R. Washburn, Kimberly E. Kurtis
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Corrigendum to “Low-field 1H NMR study on geopolymers: The effect of paramagnetic Fe(III)” [Cement and Concrete Research 166 (2023) 107116] Cem. Concr. Res. (IF 11.4) Pub Date : 2024-02-06 Ziyou Yu, Rodrigo de Oliveira-Silva, Yiannis Pontikes, Dimitrios Sakellariou
Abstract not available
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Quantification of carbonated Mg-based cement pastes by Raman spectroscopy Cem. Concr. Res. (IF 11.4) Pub Date : 2024-02-03 Tangwei Mi, Xi Chen, En-Hua Yang, Cise Unluer
This study presented a detailed investigation of the carbonation of reactive magnesia cement (RMC) and brucite cement by using Raman spectroscopy and other characterization techniques. Quantification of carbonation at different depths and formation of various reaction products in each system were demonstrated. Correlations between Raman peak intensities and carbonation degree were established by Raman
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The influence of Al2O3, CaO, MgO and TiO2 content on the early-age reactivity of GGBS in blended cements, alkali-activated materials and supersulfated cements Cem. Concr. Res. (IF 11.4) Pub Date : 2024-02-02 Simon Blotevogel, Lola Doussang, Mathilde Poirier, Ludovic André, Aurélien Canizarès, Patrick Simon, Valérie Montouillout, Judit Kaknics, Cédric Patapy, Martin Cyr
GGBS composition and the choice of the activation systems have a large impact on the reactivity of GGBS-based binders. Here, the reactivity of 16 artificially-modified GGBSs was investigated in blended cements, alkali-activated binders and supersulfated cements, using isothermal calorimetry for hydration times between 24 h and 120 h. Lower glass network polymerization by addition of CaO or MgO increased
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Citrate sorption on cement hydrates Cem. Concr. Res. (IF 11.4) Pub Date : 2024-02-02 Rosa Ester Guidone, Xavier Gaona, Frank Winnefeld, Marcus Altmaier, Horst Geckeis, Barbara Lothenbach
The interaction of citrate with hydrated Portland cement and its main hydrates: C-S-H (0.8 ≤ Ca/Si ≤ 1.4), ettringite, monosulfo-, hemi- and monocarboaluminate is investigated. The solubility of citrate-AFm and citrate-AFt was determined. Batch sorption experiments at pH = 13.2 showed that citrate sorbs relatively strongly on AFm phases and ettringite. Citrate sorbed only on the outer surfaces sites
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Stabilizing mechanisms of metastable vaterite in cement systems Cem. Concr. Res. (IF 11.4) Pub Date : 2024-02-01 Diandian Zhao, Jonah M. Williams, Pengkun Hou, Aaron J. Moment, Shiho Kawashima
Calcium carbonate exists in three anhydrous polymorphs: calcite, aragonite, and vaterite. Among these forms, calcite is considered the most thermodynamically stable, followed by metastable aragonite and vaterite. Vaterite, the least stable form, can easily transform to calcite in aqueous solutions through a dissolution–recrystallization process. However, vaterite has been observed to remain stable
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New insights into strain evolution of concrete under different freeze-thaw conditions: Investigation based on real-time and full-field monitoring Cem. Concr. Res. (IF 11.4) Pub Date : 2024-02-01 Siyuan Chen, Huigang Xiao, Weichen Tian, Minglei Ma, Min Liu
Understanding the strain development behavior of concrete during the freeze-thaw process is important to assess the remaining service life of structures in cold regions. In this study, a real-time, in-situ, and full-field strain monitoring method based on Fiber Bragg grating sensors was designed to measure the strain inside the concrete under different freeze-thaw processes. A temperature compensation
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The role of water-treated municipal solid waste incineration (MSWI) bottom ash in microstructure formation and strength development of blended cement pastes Cem. Concr. Res. (IF 11.4) Pub Date : 2024-01-29 Boyu Chen, Guang Ye
This research explored the microstructure formation and strength development of blended cement pastes prepared with municipal solid waste incineration (MSWI) bottom ash. A new sample preparation approach involving water treatment of MSWI bottom ash was developed to prevent sample cracking caused by the presence of metallic aluminum (Al) in bottom ash. The result showed that ions released during water
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Macro and microstructural evolution of low-calcium fly ash-based geopolymer mortar exposed to sulphuric acid corrosion Cem. Concr. Res. (IF 11.4) Pub Date : 2024-01-29 Piumika W. Ariyadasa, Allan C. Manalo, Weena Lokuge, Vasantha Aravinthan, Andreas Gerdes, Jonas Kaltenbach, Beatriz Arevalo Galvan
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Dissolution behaviors and mechanisms of metakaolin in acidic activators Cem. Concr. Res. (IF 11.4) Pub Date : 2024-01-27 Mengxin Bu, Qingrui Yang, Penghui Wang, Biqin Dong, Dongshuai Hou, Yanshuai Wang
Aluminosilicate dissolution is critical for understanding the chemistry of silico-aluminophosphate (SAP) geopolymer. The dissolution behaviors of typical aluminosilicate (i.e., metakaolin, MK) in organic and inorganic acids were studied using optical microscopy as well as three-dimensional profilometry. The underlying mechanisms of MK dissolution in acid solutions were further revealed using FTIR,
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Structural evolution of calcium sodium aluminosilicate hydrate (C-(N-)A-S-H) gels induced by water exposure: The impact of Na leaching Cem. Concr. Res. (IF 11.4) Pub Date : 2024-01-28 Chen Liu, Zhenming Li, Shuai Nie, Jørgen Skibsted, Guang Ye
Calcium sodium aluminosilicate hydrate C-(N-)A-S-H gels, formed through the alkali-activation of calcium silicate-based materials, may exhibit greater susceptibility to aqueous environments when compared to traditional C-(A-)S-H phases formed by hydration of blended Portland cements. This study investigates structural changes in synthesized C-(N-)A-S-H gels triggered by water immersion. Three gels
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Thermodynamic study on phase composition of hardened Portland cement paste exposed to CaCl2 solution: Effects of temperature, CaCl2 concentration, and type and dosage of supplementary cementitious materials Cem. Concr. Res. (IF 11.4) Pub Date : 2024-01-26 Tong Li, Huisu Chen, Tingting Zhang, Lin Liu, Yuhao Zheng
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Multi technique characterization of the carbonation affected zone including non-destructive single sided 1H NMR Cem. Concr. Res. (IF 11.4) Pub Date : 2024-01-26 Clarissa Glawe, Fabien Georget, Michael Raupach, Thomas Matschei
Carbonation of cement-based building materials is not only a frequent trigger for corrosion of the reinforcement, but also causes various significant property changes in the carbonated layer. In addition to the decrease in the pH of the pore solution, carbonation is accompanied by a modification in the pore structure due to dissolution and precipitation reactions. The progress of carbonation is currently
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Aqueous carbonation of aged blended Portland cement pastes: Impact of the Al/Si ratio on the structure of the alumina-silica gel Cem. Concr. Res. (IF 11.4) Pub Date : 2024-01-22 Fábio Maia Neto, Ruben Snellings, Jørgen Skibsted
Carbonation of recycled cement paste receives growing attention since it can carbonate end-of-life concrete at ambient conditions and chemically bind CO2 on a geological timescale. This work investigates aqueous carbonation of blended cement pastes, cured for 12–14 years and incorporating silica fume, fly ash, slags, and natural pozzolan as SCMs, using solid-state NMR, XRD, TGA and in-situ pH measurements
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Corrigendum to “Effect of aluminum on the structure of synthetic alkali-silica gels” [Cem. Concr. Res. 166 (2023) 107088] Cem. Concr. Res. (IF 11.4) Pub Date : 2024-01-20 Miriam E. Krüger, Anne Heisig, Harald Hilbig, Henrik Eickhoff, Detlef Heinz, Alisa Machner
Abstract not available
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Characterisation of iron-rich cementitious materials Cem. Concr. Res. (IF 11.4) Pub Date : 2024-01-18 Aniruddha Baral, Cecilia Pesce, Antonia S. Yorkshire, Zhanar Zhakiyeva, Ruben Snellings, Theodore Hanein, John L. Provis, Arne Peys
Iron is the fourth most abundant element in the Earth's crust, and cementitious materials are expected to contain iron-bearing phases, either in major or minor quantities. Iron-rich cement clinker is gaining attention because of its lower carbon footprint and higher sulfate resistance, while iron-rich resources are also increasingly being investigated as supplementary cementitious materials or as precursors