Beneficial effect of nanomaterials on the interfacial transition zone (ITZ) of non-dispersible underwater concrete

Wang, Yao Yu; Zeng, Dahai; Ueda, Tamon; Fan, Ying-Fang; Li, Chuang; Li, Jiye

doi:10.1016/j.conbuildmat.2021.123472

Cited by 41 publications

(10 citation statements)

References 51 publications

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“…However, the agglomerate at high NS dosage led to the coarser and more heterogeneous micro-surface of concrete after sulfate attack. These findings are also consistent with previous studies [ 21 , 45 , 47 , 51 , 52 ].…”

Section: Resultssupporting

confidence: 94%

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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: Resultssupporting

confidence: 94%

“…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%

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

Nie

et al. 2022

Materials

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“…Based on the results obtained, the positive role of using NM can be observed to improve the transport properties of concrete by filling more pores and densifying the cement matrix, and refining the microstructure of the cement matrix. 87 This is consistent with the findings of Khalaf et al, the incorporation of NMs into heavyweight concrete has been found to enhance the microstructure, leading to a reduction in concrete permeability. As a result of the acceleration of primary cement hydration, there is an increased formation of a dense C-S-H gel within the cement matrix and an improvement in the ITZ.…”

Section: Water Permeabilitysupporting

confidence: 92%

Effects of nano titanium and nano silica on high‐strength concrete properties incorporating heavyweight aggregate

Abu el‐Hassan,

Hakeem,

Amin

et al. 2023

Structural Concrete

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This investigation aims to study the effect of replacing 100% of fine and coarse aggregates with heavyweight aggregates and adding nano titanium (NT) and nano silica (NS) on shielding against radiation and on the mechanical and transport properties of heavyweight high‐strength concrete (HWHSC). In this study, 20 mixes were prepared that included the use of hematite and steel slag (SS) aggregate with NS or NT used as additions to mixes by the ratio 1% and 3% from cement weight. To study the effect of the total replacement of aggregates and the addition of nanomaterials (NMs) on the properties of HWHSC, to study engineering properties the slump, compressive strength, splitting tensile strength, flexural strength, and modulus of elasticity were applied. Density, chloride permeability, sorptivity coefficient, water permeability, and microstructure tests were also performed. To study the efficiency of shielding against radiation, linear attenuation coefficient, mass attenuation coefficient, mean‐free path, half‐value layer, and tenth‐value layer of different gamma‐ray sources of radiation 137Cs 662 (keV) and 60Co 1332 (keV) were applied. The results showed that the 100% SS and hematite replacement as coarse and fine aggregates with 3% (NS or NT) achieved the best mechanical and transport properties compared to other mixtures. While the highest density of the string containing hematite and SS was achieved with 3% of NT, with a density of 3384 kg/m3. The highest compressive strength of more than 116 MPa was achieved for the included mixture of 3% NS. The highest attenuation of gamma‐ray radiation was achieved with the application of hematite and SS aggregates with 3% of NT.

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“…Recently, the modification of cementitious materials with ultrafine materials has received increasing attention from researchers. Several ultrafine materials, such as nano-CaCO 3, , nano-ZnO, nano-TiO 2 , , , nano-Fe 2 O 3 , nano-SiO 2 , , , nano-Al 2 O 3 , , , ultrafine LiAl-LDH, , carbon nanofiber and graphene, , and ultrafine ettringite, have been investigated to increase the exothermic rate of hydration and enhance the mechanical properties of sulfoaluminate cement. However, ultrafine materials possess a propensity for agglomeration owing to their small particle size and high surface energy, thereby diminishing the effectiveness of nanomaterials. , …”

Section: Introductionmentioning

confidence: 99%

Effect of AH₃-PCE Ultrafine Composites on the Properties of Sulfoaluminate Cement-Based Materials

Li,

Hu,

et al. 2023

ACS Appl. Nano Mater.

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The use of superfine particles has been found to be a promising method for accelerating cement hydration. Amorphous aluminum hydroxide (AH3) is a key hydration product in sulfoaluminate cements and our preliminary research work indicated that the ultrafine amorphous AH3 accelerates the hydration rate of sulfoaluminate cement-based grouting materials (SAGMs). However, the ultrafine AH3 tends to agglomerate easily, which affects its effectiveness. In this study, aluminum hydroxide-polycarboxylic acid superplasticizer (AH3-PCE) ultrafine composites were prepared using the sol–gel method, and their effect on the hydration and hardening process of SAGMs was investigated. The results showed that the particle size of the AH3-PCE ultrafine composites decreased and then increased with increasing amount of PCE and there was a strong interaction of AH3 with PCE through the oxygen atoms of C–O–C. AH3-PCE ultrafine composites provided nucleation for the growth of bayerite and ettringite (AFt). Moreover, the AH3-PCE ultrafine composites released aluminum ions and PCE in an alkaline solution at pH 12.5. The AH3-PCE ultrafine composites promoted cement hydration, adjusted the pore structure of the hardened paste, and improved the compressive strength at all ages owing to the synergistic effect of nucleation, aluminum ions, and PCE released from the AH3-PCE ultrafine composite.

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Beneficial effect of nanomaterials on the interfacial transition zone (ITZ) of non-dispersible underwater concrete

Cited by 41 publications

References 51 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

Effects of nano titanium and nano silica on high‐strength concrete properties incorporating heavyweight aggregate

Effect of AH₃-PCE Ultrafine Composites on the Properties of Sulfoaluminate Cement-Based Materials

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Beneficial effect of nanomaterials on the interfacial transition zone (ITZ) of non-dispersible underwater concrete

Cited by 41 publications

References 51 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

Effects of nano titanium and nano silica on high‐strength concrete properties incorporating heavyweight aggregate

Effect of AH3-PCE Ultrafine Composites on the Properties of Sulfoaluminate Cement-Based Materials

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Product

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Effect of AH₃-PCE Ultrafine Composites on the Properties of Sulfoaluminate Cement-Based Materials