-
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
-
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
This study introduced a four-way CFD-DEM coupling approach to simulate the shear-induced particle migration (SIPM) mechanism leading to formation of the lubrication layer (LL) during concrete pumping. The CFD-DEM simulations considered the coupled effect of concentration (10 %–40 %) and wide size distribution (1–17 mm) of aggregate and rheology of the mortar for forces between the suspending matrix
-
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
Although concrete is the most used construction material, its processes passively rely on rheology. Active Rheology Control (ARC) was introduced to overcome contradicting requirements by (reversibly) altering rheology via external stimuli. Since little is known about modelling ARC behaviour, a conceptual model was proposed as actively controllable extension of passive thixotropy; based on the kinetic
-
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
-
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
-
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
-
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
-
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
-
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
-
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
-
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
-
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
-
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
-
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
-
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
-
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
-
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
-
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
-
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
-
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
-
-
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
-
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
-
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
-
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
-
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
-
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
-
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,
-
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
-
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
-
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
-
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
-
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
-
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
-
Theoretical model for the coupling effect of moisture transport on chloride penetration in concrete Cem. Concr. Res. (IF 11.4) Pub Date : 2024-01-17 Osamah H.A. Dehwah, Yunping Xi
Concrete's internal pore structure crucially influences the rate at which moisture and chemicals, e.g., chloride, move through concrete. This paper explores the coupling effect of moisture transport on the chloride penetration in both saturated and non-saturated concrete, which arises because moisture carries chloride ions as it moves through the pores. To characterize simultaneous moisture and chloride
-
Understanding the role of magnesium ions on setting of metakaolin-based geopolymer Cem. Concr. Res. (IF 11.4) Pub Date : 2024-01-18 S.S. Zhang, Shuaibin Wang, Xu Chen
Seawater-based geopolymers potentially capitalize on the abundant seawater and reduce the CO2 emissions for marine/offshore constructions. Unlike the well-documented seawater ions (e.g., Ca2+, Na+, and Cl−), existing studies on magnesium-ion (Mg2+)-induced changes of geopolymers, especially the non‑calcium mixtures, have been limited. In this study, Mg2+ was confirmed to retard the setting of sodium-silicate
-
Investigation of compressive creep of calcium-silicate-hydrates (C-S-H) in hardened cement paste through micropillar testing Cem. Concr. Res. (IF 11.4) Pub Date : 2024-01-19 Weiqiang Guo, Ya Wei
This study presents an experimental method for investigating the compressive creep behavior of C-S-H micropillars at micro-scale. The micropillars with two different diameters (5 μm and 0.5 μm) in hardened cement paste (HCP) are fabricated using focused ion beam (FIB) milling and subjected to compression using an indenter with flat-end tip. Multi-stage loading protocols are used to sequentially obtain
-
Probing the hydration behavior of tricalcium aluminate under the in situ polymerization of acrylic acid Cem. Concr. Res. (IF 11.4) Pub Date : 2024-01-19 Qing Liu, Xing Ming, Miaomiao Wang, Qiao Wang, Yunjian Li, Zongjin Li, Dongshuai Hou, Guoqing Geng
The early hydration of Portland cement is profoundly affected by the mineral phase of tricalcium aluminate (C3A), but how in situ polymerization of monomers influences the hydration of C3A remains unclear. Herein, we probed the effect of in situ polymerization of acrylic acid (AA) on the hydration behavior of cubic C3A from experiment and ab initio molecular dynamics simulation (AIMD). Our findings
-
Understanding water vapor sorption hysteresis and scanning behaviors of hardened cement pastes: Experiments and modeling Cem. Concr. Res. (IF 11.4) Pub Date : 2024-01-20 Zhen Wang, Kefei Li
The water vapor sorption is a potent characterizing technique for the hygro-properties and nano-structures of cement-based materials. However, limited attention has been paid to the scanning curves cutting across the hysteresis region. This paper investigates comprehensively the hysteretic and scanning behaviors of water vapor sorption for hardened cement pastes with usual binders including Portland
-
Bayesian design of concrete with amortized Gaussian processes and multi-objective optimization Cem. Concr. Res. (IF 11.4) Pub Date : 2024-01-16 Olivia P. Pfeiffer, Kai Gong, Kristen A. Severson, Jie Chen, Jeremy R. Gregory, Soumya Ghosh, Richard T. Goodwin, Elsa A. Olivetti
Here, we present a computational framework, combining machine learning models with inverse optimization, which can accelerate and optimize concrete mix design with respect to climate impact and/or cost. Our approach leverages a novel amortized Gaussian process (GP) model trained on a large industry dataset to predict concrete strength based on mix proportions. The resulting GP model has an R2 value
-
-
Phase stabilities and thermodynamic properties of crystalline phases in CaO–SiO2–H2O above 100 °C Cem. Concr. Res. (IF 11.4) Pub Date : 2024-01-05 Tamino Hirsch, Barbara Lothenbach
The current study revises the phase diagram of the CaO–SiO2–H2O system at saturated steam pressure between 100 and 250 °C by combining experimentally observed phase relations, solubility data and thermodynamic restrictions. A new self-consistent thermodynamic dataset for crystalline C-S-H phases is reported. The dataset revises known thermodynamic properties and derives values for phases for which
-
Retardation effect of the pozzolanic reaction of low-calcium supplementary cementitious materials on clinker hydration at later age: Effects of pore solution, foreign ions, and pH Cem. Concr. Res. (IF 11.4) Pub Date : 2024-01-05 Tiao Wang, Satya Medepalli, Yuqian Zheng, Wei Zhang, Tetsuya Ishida, Shashank Bishnoi, Dongshuai Hou, Zhenguo Shi
Clinker hydration at later age in blended cement pastes was found to be retarded by the pozzolanic reaction of low-calcium supplementary cementitious materials (SCMs). Various mechanisms were explored, including the consumption of pore solution, the presence of foreign ions, and pH-related effects. Experimental results indicated that the dissolution of the foreign ions from SCMs was a secondary effect
-
The intrinsic mechanical properties of hydromagnesite, Mg5(CO3)4(OH)2·4H2O, a key phase of reactive MgO carbonate cement Cem. Concr. Res. (IF 11.4) Pub Date : 2024-01-06 Wenxin Zhang, Jiaqi Li
To potentially enable CO2 sequestration, reactive MgO carbonate cement is emerging as an alternative binder to Portland cement. Understanding the mechanical properties of its binding phase is critical for understanding the strength development and performing materials design for reactive MgO cement systems; however, the intrinsic mechanical properties of hydromagnesite (Mg5(CO3)4(OH)2·4H2O), a key
-
Modification of magnesium hydroxide for improved performance in CO2 sequestration Cem. Concr. Res. (IF 11.4) Pub Date : 2024-01-03 Zhongyuan Du, Cise Unluer
-
Modeling the ionic diffusion coefficient of unsaturated hardened cement paste: A micromechanical approach Cem. Concr. Res. (IF 11.4) Pub Date : 2024-01-03 Mingliang Zhang, Di Lin, Zheng He, Rongwei Yang
Most of the concrete structures in service are unsaturated, estimating the ionic diffusion coefficient of unsaturated cement-based material is of paramount significance to assessment of corrosion of reinforced concrete. Taking account of the contributions from different water configurations at multi-scale (water films, interlayer water, large gel pore (LGP) water and capillary pore water) and the corresponding
-
Hydration and phase assemblage of limestone calcined clay cements (LC3) with clinker content below 50 % Cem. Concr. Res. (IF 11.4) Pub Date : 2023-12-30 Jinfeng Sun, Franco Zunino, Karen Scrivener
Limestone calcined clay cement (LC3) is a promising material for producing cement with low CO2 emissions and properties similar to, or superior to, those of Portland cement (PC), but at 50 % clinker content (LC3-50). In many applications, lower strengths than PC are acceptable, opening new opportunities to develop suitable LC3 formulations with clinker contents below 50 %. In this study, we investigate
-
The neutralization of tricalcium aluminate hexahydrate and its spontaneous transformation into Friedel's salt, a layered double hydroxide Cem. Concr. Res. (IF 11.4) Pub Date : 2023-12-29 Eszter Kása, Yvette Szabó, Márton Szabados, Ákos Kukovecz, Zoltán Kónya, Pál Sipos, Bence Kutus
Tricalcium aluminate hexahydrate, C3AH6, forms during the hydration of the oxide form, C3A. Modelling the resulting phase composition over time has been the subject of intensive research; yet, understanding the effect of pH, a crucial parameter of cementitious mixtures, has remained elusive. To this end, we studied the stability of C3AH6 in a wide pH range via the addition of HCl. We compared the behavior
-
Performance improvement of Portland-limestone cement by mechanochemical activation Cem. Concr. Res. (IF 11.4) Pub Date : 2023-12-23 Jihoon Lee, Barbara Lothenbach, Juhyuk Moon
This study investigates mechanochemical activation with alkanolamine-based agents for improving the material performance of Portland-Limestone Cement (PLC). By using 0.1 wt% of diethanolisopropanolamine during grinding process, a noticeable improvement of compressive strength (>100 % increase in 28 days) was confirmed for PLC containing 20 % limestone due to the favorable interaction between the d
-
Mechanochemical formation of highly stable amorphous calcium carbonate in calcium silicates: Potential long-term storage of CO2 in cement Cem. Concr. Res. (IF 11.4) Pub Date : 2023-12-23 John S. Vaughn, Maxwell A.T. Marple, Harris E. Mason
We have investigated mechanochemical reactions with the calcium silicate wollastonite to probe potential mechanisms of sequestration and long-term storage of CO2 as mineral carbonates in cement pastes. Wollastonite, CaSiO3, was milled under ambient and 13C enriched CO2 atmospheres. Milling induced a structure change from monoclinic wollastonite−2M to triclinic−1T, consistent with high pressure treatment
-
A hierarchical C-S-H/organic superstructure with high stiffness, super-low porosity, and low mass density Cem. Concr. Res. (IF 11.4) Pub Date : 2023-12-20 Xinping Zhu, Laurent Brochard, Matthieu Vandamme, Qiang Ren, Chen Li, Zhengwu Jiang
Herein, a hierarchical cementitious calcium silicate hydrate (C-S-H) superstructure with high Young's modulus, super-low porosity, and low mass density is reported. It has a very high Young's modulus at 47.5 GPa, three times higher than our reference synthetic C-S-H. Its specific surface area is merely 0.4509 m2/g, two orders of magnitude smaller than our reference synthetic C-S-H and the most common
-
Permeability of C-S-H Cem. Concr. Res. (IF 11.4) Pub Date : 2023-12-20 Tulio Honorio
Hydrodynamics in calcium silicate hydrates nanopores are crucial to concrete’s durability and confinement performance. Here, Non-Equilibrium Molecular Dynamics simulations of water confined in-between C-S-H layers are reported considering slit pore sizes spanning interlayer and gel pores. These simulations enable the computation of the permeability of C-S-H and the quantification of the boundary conditions
-
Methodology for formulating low-carbon printable mortar through particles packing optimization Cem. Concr. Res. (IF 11.4) Pub Date : 2023-12-19 Victor De Bono, Nicolas Ducoulombier, Romain Mesnil, Jean François Caron
-
Corrigendum to “Assessment of the thermodynamics of Na,K-shlykovite as potential alkali-silica reaction products in the (Na,K)2O-CaO–SiO2-H2O system” [Cement and Concrete Research (2023), 172, #107253] Cem. Concr. Res. (IF 11.4) Pub Date : 2023-12-14 Haoliang Jin, Sam Ghazizadeh, John L. Provis
Abstract not available
-
Increased monocarbonate formation during long-term hydration of CAC-limestone binder by calcium sulfate addition – A temperature-dependent XRD study Cem. Concr. Res. (IF 11.4) Pub Date : 2023-12-06 Pauline Rost, Friedlinde Goetz-Neunhoeffer
The long-term hydration of a mix with and without gypsum addition was investigated at 10, 23 and 40 °C by QXRD analysis. In addition, thermodynamic modelling was performed on all systems using GEMS to determine the stable phase composition and the influence of water loss during hydration. The results show that the formation of conversion-sensitive phases such as CAH10 is accelerated at 10 °C and hindered
-
A novel lattice model to predict chloride diffusion coefficient of unsaturated cementitious materials based on multi-typed pore structure characteristics Cem. Concr. Res. (IF 11.4) Pub Date : 2023-12-07 Liang-yu Tong, Qing Xiang Xiong, Zhidong Zhang, Xiangsheng Chen, Guang Ye, Qing-feng Liu
This paper develops a novel lattice diffusive model to quantitatively study the chloride diffusion coefficient in unsaturated cementitious materials, in which the pore voxels are redistributed to make a better representation of a real microstructure of hardened cement paste. Considering the hierarchical microstructure and different drying-wetting cycles, water distributions in multiscale pore structures
-
3-Dimensional insight into zonation within slag rims of aged blended cement Cem. Concr. Res. (IF 11.4) Pub Date : 2023-11-30 Yu Zhang, Oğuzhan Çopuroğlu
Through the integration of SEM-BSE and TEM, we gained a comprehensive 3-dimensional understanding of different distribution patterns of inner hydration products of slag. For fully hydrated small slag grains, two distinct sub-zones were formed in the rims. Lath-like, well-crystalline hydrotalcite-like crystals were found to precipitate, grow, and accumulate near the boundary, forming a layer with a
-
Hybrid binders based on volcanic pumice: Effect of the chemical composition on strength and microstructures Cem. Concr. Res. (IF 11.4) Pub Date : 2023-12-01 Jesus Lopez-Salas, J. Ivan Escalante-Garcia
This research focused on pastes of hybrid binders (HB-VP) based on precursors of Volcanic pumice (VP, 25–75 %) and portland cement (PC, 25–75 %), activated with 4–12 wt% Na2SO4 and Ca(OH)2 in various molar ratios Na2SO4:Ca(OH)2. The experimental work and results were based on the surface response method and statistical tools, which indicated that the %VP influenced the early strength for up to 28 days
-
Alkali silica reaction in concrete - Revealing the expansion mechanism by surface force measurements Cem. Concr. Res. (IF 11.4) Pub Date : 2023-12-01 Andreas Leemann, Michał Góra, Barbara Lothenbach, Manfred Heuberger
Alkali-silica reaction (ASR) is a major cause for concrete deterioration worldwide. However, the mechanism leading to cracking has not been identified yet. In this study, the extended Surface Force Apparatus (eSFA) has been used to determine the surface forces of alkali-silica solutions between two atomically smooth mica surfaces. The setup imitates the situation present in reactive concrete aggregates
-
Influence of a dialysed polymer latex on the hydration of OPC – A closer look into adsorption processes Cem. Concr. Res. (IF 11.4) Pub Date : 2023-12-01 Jakob Schreiber, Jian Wang, Xiangming Kong, Jürgen Neubauer, Daniel Jansen
The impact of a dialysed styrene acrylate copolymer on cement hydration was investigated. The retarding and depressing mechanism of the polymer particles on OPC hydration was examined via heat flow calorimetry, in-situ X-ray analysis and pore solution composition measurements. To ensure excessive polymer particles were remaining in the pore solution during the hydration, a high polymer-cement-ratio