Synthesis and characterization of an intermediate for C-S-H structure tailoring

Zhu, Zheyu; Wang, Zhongping; Xu, Linglin; Zhou, Yue; Chen, Yuting; Wu, Kai; Schutter, Geert De

doi:10.1016/j.cemconres.2022.106923

Cited by 23 publications

(5 citation statements)

References 67 publications

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“…This reduction was detrimental to the density of the C−S−H gel. 18,55 In conclusion, the porosity of the CRC increased after CO 2 was injected.…”

Section: Discussionmentioning

confidence: 80%

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Study of CO₂ Injection Timing within the Mixing Process of Ready-Mix Concrete for Win–Win Improvements of Mechanical Properties and CO₂ Sequestration

Zhang,

Yuan,

et al. 2024

ACS Sustainable Chem. Eng.

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The optimal CO 2 injection timing is a critical factor in CO 2 utilization and sequestration during the mixing process of ready-mix concrete. In this study, the optimal CO 2 injection timing in fresh cement paste was evaluated based on the compressive strength and environmental benefits. X-ray diffraction (XRD), thermal gravimetric (TG), mercury intrusion porosimetry (MIP), scanning electron microscopy (SEM), and energydispersive spectroscopy (EDS) measurements were performed to explore the corresponding changes in carbonation ready-mix concrete (CRC) during the injection of CO 2 . The beneficial impacts on the compressive strength were observed, which included the refinement effect of nano-CaCO 3 formation and the enhancement effect of vanished CO 2 bubbles. The early hydration reaction was promoted by CO 2 injection while the long-term hydration reaction was hindered, as noted from the corresponding degree of hydration. Furthermore, the win−win improvements of mechanical properties and CO 2 sequestration were assessed using the CO 2 index. The optimal CO 2 injection timing, which involved injecting CO 2 during the mixing process in the mixer, was determined based on the minimal CO 2 index.

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“…This reduction was detrimental to the density of the C−S−H gel. 18,55 In conclusion, the porosity of the CRC increased after CO 2 was injected.…”

Section: Discussionmentioning

confidence: 80%

“…Third, the carbonation reaction in the fresh cement pastes further exacerbated the decrease of Ca 2+ , which negatively affected the Ca/Si ratio. This reduction was detrimental to the density of the C–S–H gel. , In conclusion, the porosity of the CRC increased after CO 2 was injected.…”

Section: Discussionmentioning

confidence: 88%

Study of CO₂ Injection Timing within the Mixing Process of Ready-Mix Concrete for Win–Win Improvements of Mechanical Properties and CO₂ Sequestration

Zhang,

Yuan,

et al. 2024

ACS Sustainable Chem. Eng.

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“…Since OS (whose main component is CaCO 3 ) and fumed silica can be converted to acid-insoluble calcium silicate hydrate (CSH) by calcination, the conversion of OS to CSH can be an effective way to compensate for the disadvantages of OS when it is used as an adsorbent [25]. In previous studies, the preparation of CSH involves the utilization of expensive and toxic chemical reagents [26][27][28]. Here, OS, an abundant biowaste, was used to replace commercial calcium chloride and no toxic solvent was used in the preparation of CSH.…”

Section: Introductionmentioning

confidence: 99%

Recovery of Palladium from Acidic Solution Using Polyethylenimine-Crosslinked Calcium Silicate Hydrate Derived from Oyster Shell Waste: Adsorption and Mechanisms

Kang

Wang

Won

2023

Adsorption Science & Technology

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In this work, a new adsorbent with effective Pd(II) adsorption ability was synthesized using an oyster shell and fumed silica as the matrix materials and polyethyleneimine as the functional ligand. The adsorption performance of the developed adsorbent was evaluated for the recovery of palladium chloride ions (Pd(II)) from strong acid solutions. To understand the characteristics of the materials used in the study, samples were characterized by Fourier transform infrared spectroscopy (FT-IR), transmission electron microscopy (TEM), X-ray diffraction (XRD), and zeta potential analysis. Zeta potential analysis revealed that the isoelectric point of polyethylenimine-crosslinked calcium silicate hydrate (PEI-CSH) was 9.85. Isotherm experiments revealed that the maximum Pd(II) uptake estimated by the Langmuir model was 156.03 mg/g, which was 22.4 and 35.6 times higher than that of the oyster shell powder (OSP) and calcium silicate hydrate (CSH), respectively. The Pd(II) adsorption equilibrium was established in 180 minutes, according to kinetic experiments. These results suggested the possibility of Pd(II) recovery from oyster shell-based adsorbent. Through five adsorption and desorption cycles, the reusability of PEI-CSH was confirmed. PEI-CSH can therefore be considered a potential adsorbent for Pd(II) recovery.

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Section: Introductionmentioning

confidence: 99%

“…For polymer/C-S-H system, the other possible structure is that polymer may bind C-S-H stacking units instead of through insertion [ 19 , 28 , 29 , 30 ]. As the results in our previous study show [ 28 , 29 , 30 ], when forming polymer-binding C-S-H, the polymers can react with C-S-H by covalent bonding and hydrogen bonding. For example, Zhu [ 29 ] demonstrated that PDMS locates between adjacent C-S-H stacking particles, which modified both the chemical structure and stacking mode.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties Evaluation of Polymer-Binding C-S-H Structure from Nanoscale to Macroscale: Hydroxyl-Terminated Polydimethylsiloxane (PDMS) Modified C-S-H

et al. 2022

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Exploring and modifying the C-S-H structure at a micro–nano level is an effective solution to improve the performance of Portland cement. Compared with organics inserting C-S-H, the research on the performance of a polymer-binding C-S-H structure from nanoscale to macroscale is limited. In this work, the mechanical properties of a modified C-S-H, using hydroxyl-terminated polydimethylsiloxane (PDMS) as the binders, are evaluated. The PDMS-modified C-S-H structures are introduced into macro-defect-free cement to obtain stress–strain curves changes at a macro scale. The AFM–FM was adopted to measure the morphology and elastic modulus of C-S-H at a nano scale. The molecular dynamics (MD) simulation was performed to assess the toughness, tensile properties, and failure mechanism. The results show that the PDMS-modified C-S-H powders change the break process and enhance ductility of MDF cement. The elastic modulus of PDMS-modified C-S-H is lower than pure C-S-H. When PDMS molecules are located between the stacking crystal units, it can enhance the toughness of C-S-H aggregates. The PDMS-modified C-S-H stacking structure has better plasticity, and its tensile strains are higher than the pure C-S-H. PDMS molecules hinder the initial crack expansion, leading to the branching of the initial crack. In addition, the measurement of AFM–FM can identify and obtain the mechanical properties of basic units of C-S-H. This paper enhances the understanding of cement strength sources and modification methods.

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Synthesis and characterization of an intermediate for C-S-H structure tailoring

Cited by 23 publications

References 67 publications

Study of CO₂ Injection Timing within the Mixing Process of Ready-Mix Concrete for Win–Win Improvements of Mechanical Properties and CO₂ Sequestration

Study of CO₂ Injection Timing within the Mixing Process of Ready-Mix Concrete for Win–Win Improvements of Mechanical Properties and CO₂ Sequestration

Recovery of Palladium from Acidic Solution Using Polyethylenimine-Crosslinked Calcium Silicate Hydrate Derived from Oyster Shell Waste: Adsorption and Mechanisms

Mechanical Properties Evaluation of Polymer-Binding C-S-H Structure from Nanoscale to Macroscale: Hydroxyl-Terminated Polydimethylsiloxane (PDMS) Modified C-S-H

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Synthesis and characterization of an intermediate for C-S-H structure tailoring

Cited by 23 publications

References 67 publications

Study of CO2 Injection Timing within the Mixing Process of Ready-Mix Concrete for Win–Win Improvements of Mechanical Properties and CO2 Sequestration

Study of CO2 Injection Timing within the Mixing Process of Ready-Mix Concrete for Win–Win Improvements of Mechanical Properties and CO2 Sequestration

Recovery of Palladium from Acidic Solution Using Polyethylenimine-Crosslinked Calcium Silicate Hydrate Derived from Oyster Shell Waste: Adsorption and Mechanisms

Mechanical Properties Evaluation of Polymer-Binding C-S-H Structure from Nanoscale to Macroscale: Hydroxyl-Terminated Polydimethylsiloxane (PDMS) Modified C-S-H

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Study of CO₂ Injection Timing within the Mixing Process of Ready-Mix Concrete for Win–Win Improvements of Mechanical Properties and CO₂ Sequestration

Study of CO₂ Injection Timing within the Mixing Process of Ready-Mix Concrete for Win–Win Improvements of Mechanical Properties and CO₂ Sequestration