A Multi-scale Study of Enhancing Mechanical Property in Ultra-High Performance Concrete by Steel-fiber@Nano-silica

Huang, Jiale; Zhou, Yang; Yang, Xiao; Dong, Yujia; Jin, Ming; Liu, Jiaping

doi:10.1016/j.conbuildmat.2022.128069

Cited by 24 publications

(5 citation statements)

References 59 publications

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“…A proper amount of nano silica can make full use of the space resistance property of polycarboxylic acid water reducer and produce a synergistic effect, enhancing the elastic modulus of HPC specimens [ 22 , 41 , 42 ]. Hence, it can be seen that the elastic modulus is obviously elevated in NS modified specimens, especially with 1% NS additive.…”

Section: Resultsmentioning

confidence: 99%

“…Hence, it can be seen that the elastic modulus is obviously elevated in NS modified specimens, especially with 1% NS additive. Too much nano silica can easily induce agglomeration and generate the hardening components in cement, which cannot be arranged in an orderly manner, leading to a gap between the hardening components in the concrete [ 41 , 43 , 44 ].…”

Section: Resultsmentioning

confidence: 99%

“…With respect to the compressive strength, the pozzolanic activity and filling effect of NS can promote the strength of cement-based materials [ 21 , 26 , 41 , 45 ]. Therefore, the quality of HPC specimens can be guaranteed under the conditions of sulfate attack.…”

Section: Resultsmentioning

confidence: 99%

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Analysis of High Performance Concrete Mixed with Nano-Silica in Front of Sulfate Attack

Nie

et al. 2022

Materials

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Nano-silica (NS) is an effective material to improve the strength and durability of high-performance concrete (HPC), but little information is available regarding its role in HPC response to long-term sulfate attack. In this study, six different dosages of NS (0%, 1%, 2%, 3%, 4%, and 5%) as cement partial replacement were mixed into HPC and the casted specimens were soaked in sulfate solution for different periods (0, 100, 200, and 300 days). The mass change, dynamic elastic modulus, compressive and splitting strength, microstructure morphology, and porosity characteristics of HPC specimens were measured by mass tests, mechanical properties tests, scanning electron microscopy (SEM), and nuclear magnetic resonance (NMR) tests. The results showed that the incorporation of NS decreased the mass loss, elevated the compressive and splitting strength, and reduced the porosity formation of HPC in front of sulfate attack. The percentage of 1% NS was among the most effective dosages as, after soaking for 300 days, it decreased the mass loss by 13.5%, elevated the elastic modulus as well as compressive and splitting strength by 50.4%, 31.7%, and 69.8% in comparison of unmodified HPC, respectively. The sulfate attack resistance was delayed in a higher (2–5%) mixed dosage, mainly due to the agglomeration of nano particles, especially after long-term reactions. This study can provide experimental references regarding the performance of HPC mixed with NS in front of sulfate attack.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Analysis of High Performance Concrete Mixed with Nano-Silica in Front of Sulfate Attack

Nie

et al. 2022

Materials

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“…In this study, a hybrid approach was used, where the CLAYFF force field described the interactions between C 3 S and water molecules, while the CVFF force field described the TRI molecules. 29 Specifically, both the CLAYFF force field and the CVFF force field use the Lennard-Jones description of van der Waals, with the expression shown in eq 1.…”

Section: Simulation Methodsmentioning

confidence: 99%

“…The CVFF force field is particularly suitable for low-molecular-weight organic crystals and encompasses bond lengths, bond angles, torsional angles, and dihedral interactions. In this study, a hybrid approach was used, where the CLAYFF force field described the interactions between C 3 S and water molecules, while the CVFF force field described the TRI molecules . Specifically, both the CLAYFF force field and the CVFF force field use the Lennard-Jones description of van der Waals, with the expression shown in eq . E normalV normalD normalW = ∑ i ≠ j D 0 , i j [ ( R 0 , i j r i j ) 12 − 2 ( R 0 , i j r i j ) 6 ] …”

Section: Simulation Methodsmentioning

confidence: 99%

Elucidating the Synergistic Effects of Temperature Rise Inhibitor at the Water Tricalcium Silicate Interface

Huang,

Aretxabaleta,

Yan

et al. 2024

J. Phys. Chem. C

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Organic−inorganic composites play a crucial role in modulating concrete properties, encompassing interfacial interactions and their synergistic mechanisms. Unraveling these interactions presents a formidable challenge. In this study, molecular dynamics simulations were employed to probe the intricate structure, competition, and equilibrium state of interfacial connections involving a temperature rise inhibitor (TRI), C 3 S, and water. Computational results reveal that the interplay of different bonding networks significantly influences the equilibrium state of the C 3 S−TRI interfacial interactions, marked by dynamic adsorption− desorption equilibria. The interaction between C 3 S and TRI manifests in intricate calcium−oxygen and hydrogen bonding networks, which are both easily disturbed by water molecules. Oxygen sites in water serve as binding sites for calcium atoms in C 3 S and hydrogen atoms in TRI, thereby attenuating the C 3 S−TRI bonding. Simultaneously, hydrogen sites in water engage with oxygen sites in the TRI, diminishing calcium−oxygen bonding and prompting the detachment of TRI from the C 3 S surface. Moreover, these hydrogen sites interact with the oxygen sites on the C 3 S surface, inducing lattice structure alterations and removal of calcium atoms from C 3 S. As TRI detaches into the liquid phase, it forms complexes with calcium ions, reducing the migration rate of calcium ions within the liquid phase. This study represents the inaugural comprehensive evaluation of the interfacial interaction mechanism between TRI, C 3 S, and water, offering fundamental insights into the impact of TRI on the evolution of the C 3 S phase. These findings contribute to a deeper understanding of the complex interplay governing concrete properties, paving the way for enhanced control and optimization in concrete technology.

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Advancements in Geopolymer Concrete: A Detailed Review of Engineering Properties with Nanomaterial Integration

Kumar,

Ghosh,

Pahuja

2024

Iran J Sci Technol Trans Civ Eng

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A Multi-scale Study of Enhancing Mechanical Property in Ultra-High Performance Concrete by Steel-fiber@Nano-silica

Cited by 24 publications

References 59 publications

Analysis of High Performance Concrete Mixed with Nano-Silica in Front of Sulfate Attack

Analysis of High Performance Concrete Mixed with Nano-Silica in Front of Sulfate Attack

Elucidating the Synergistic Effects of Temperature Rise Inhibitor at the Water Tricalcium Silicate Interface

Advancements in Geopolymer Concrete: A Detailed Review of Engineering Properties with Nanomaterial Integration

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