Influence of singular and binary nanomaterials on the physical, mechanical and durability properties of mortars subjected to elevated temperatures and freeze–thaw cycles

Polat, Rıza; Qarluq, Abdul Wakil; Karagöl, Fatma

doi:10.1016/j.conbuildmat.2021.123608

Cited by 14 publications

(5 citation statements)

References 48 publications

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“…This is due to the effect of the nano-kaolinite filling the small pores in the cement specimens and the pozzolanic reactivity of the nano-kaolinite to produce additional C-S-H gels, which increases the compactness of the cement and thus the compressive strength of the cement specimens. This is similar to known findings [11,33].…”

Section: Compressive Strengthsupporting

confidence: 93%

“…This is because mechanical dispersion can effectively improve the dispersibility of nano-kaolinite, which gives full play to its filling effect, nucleation effect, and pozzolanic reactivity. It can better fill the pores, increase the C-S-H production, and improve the microstructure and porosity [33], thus improving the flexural properties of the cement.…”

Section: Flexural Strengthmentioning

confidence: 99%

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Effect of Nano-Clay Dispersion on Pore Structure and Distribution of Hardened Cement Paste

Wu,

Chen,

Zhang

et al. 2023

Buildings

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Nano-clay has the potential to improve the properties of cement-based materials. However, the effectiveness of this improvement is influenced by the dispersion of the nano-clay. The effects of different nano-clay dispersion techniques on cement-based material properties and pore structure complexity were studied. The samples were prepared using manual and mechanical dispersion methods. The mechanical properties of the specimens were evaluated, and the pore characteristics of the cement-based materials were analysed using mercury intrusion porosimetry. The study investigated the effect of the dispersion method on the nano-clay dispersion. The complexity of the pore structure was evaluated using a fractal model, and the relationship between the fractal dimension, mechanical properties, and pore structure was analysed. The findings indicate that mechanical dispersion results in better dispersion than manual dispersion, and the mechanical properties of mechanical dispersion are superior to those of manual dispersion. Nano-clay particles can improve the internal pore structure of cement materials. Through mathematical calculation, the surface fractal dimension is between 2.90 and 2.95, with good fractal characteristics. There is a good correlation between the surface fractal dimension and the mechanical properties. The addition of nano-clay can reduce the complexity of the pore structure, and the fractal dimension has an excellent linear relationship with the pore structure.

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Section: Compressive Strengthsupporting

confidence: 93%

Section: Flexural Strengthmentioning

confidence: 99%

Effect of Nano-Clay Dispersion on Pore Structure and Distribution of Hardened Cement Paste

Wu,

Chen,

Zhang

et al. 2023

Buildings

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“…Frost resistance is considered as one of the main durability parameters, especially in cold climates [104]. Effect of NT on the freeze and thaw resistance of cementitious composites has not been sufficiently investigated.…”

Section: Effect On Freeze and Thaw Resistancementioning

confidence: 99%

A review of the effect and optimization of use of nano-TiO2 in cementitious composites

Döndüren¹,

Al-Hagri²

2022

Res. Eng. Struct. Mat.

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There are some problems and weaknesses related to cement-based materials, such as their very low tensile strength, low chemical resistance and the huge contribution of cement production to industrial CO2 emissions. One possible method to reduce the impacts of such problems is the partial replacement of cement in cementitious materials with nano materials. This work provides a detailed review of incorporation of one of the most widely used nano materials, namely nano-titanium dioxide, and its effect on the properties of cementitious composites. Different properties have been considered in the current study, such as fresh properties, mechanical properties (compressive strength, split tensile strength and flexural strength), durability (permeability, ultrasonic pulse velocity (UPV), electrical resistivity, carbonation resistance, freeze and thaw resistance and sulfate attack resistance) and microstructural properties. This paper also investigates the optimum content of nano-TiO2 in cement-based materials. Moreover, the cost effectiveness of use on nano-titania in cementitious composites has been discussed. Nano titania reduces the workability and setting time of cement-based materials. It can be very effective in improving the mechanical properties, durability and microstructural properties of cementitious composites.

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“…The NS and NC used alone required a certain amount of doping to be raised at the 200 °C to 800 °C studied, with the large number of scholars mixing NS alone at around 2% to 3% reflected in the review paper. This view is also reflected by the authors Polat et al [ 105 ], where a single number of 2.5% nanomaterials improved the mechanical properties by 7% and 3% over normal concrete at 250 °C and 500 °C. Cao, Ming, et al [ 124 ] studied the residual compressive properties of high-temperature calcium carbonate whisker concrete, with high temperatures causing CaCO3 and hydration products to decompose as a major factor in strength loss until 600 °C.…”

Section: Discussionmentioning

confidence: 63%

“…The authors concluded that NS could effectively improve the mechanical properties of concrete after a high temperature and that the synergistic effect of NS and carbon fibre is the main factor for the improved mechanical properties of NS carbon fibre-reinforced concrete after a high temperature. A similar study was carried out by the authors Polat et al [ 105 ], here using the singular material NS to improve the high-temperature resistance of the concrete, even when heated to 750 °C. The samples showed a 54% increase in compressive strength over the original concrete: a more striking finding than that of the previous author.…”

Section: Influence Of Nano Concrete Properties Under High-temperature...mentioning

confidence: 84%

Concrete Performance Attenuation of Mix Nano-SiO2 and Nano-CaCO3 under High Temperature: A Comprehensive Review

Syamsunur

Memon

et al. 2022

Materials

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Fire and extreme heat environmental changes can have an impact on concrete performance, and as climate change increases, new concrete structures are being developed. Nano-silica and nano-calcium carbonate have shown excellent performances in modifying concrete due to their large specific surface areas. This review describes the changes in concrete modified with nano-silica (NS) and nano-calcium carbonate (NC), which accelerate the hydration reaction with the cementitious materials to produce more C-S-H, resulting in a denser microstructure and improved mechanical properties and durability of the concrete. The mechanical property decay and visualization of deformation of mixed NS and NC concrete were tested by exposure to high temperatures to investigate the practical application of mixed composite nanomaterials (NC+NS) to concrete. The nano-modified concrete had better overall properties and was heated at 200 °C, 400 °C, 600 °C and 800 °C to relatively improve the mechanical properties of the nano concrete structures. The review concluded that high temperatures of 800 °C to 1000 °C severely damaged the structure of the concrete, reducing the mechanical properties by around 60%, and the dense nano concrete structures were more susceptible to cracking and damage. The high temperature resistance of NS and NC-modified nano concrete was relatively higher than that of normal concrete, with NC concrete being more resistant to damage at high temperatures than the NS samples.

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Influence of singular and binary nanomaterials on the physical, mechanical and durability properties of mortars subjected to elevated temperatures and freeze–thaw cycles

Cited by 14 publications

References 48 publications

Effect of Nano-Clay Dispersion on Pore Structure and Distribution of Hardened Cement Paste

Effect of Nano-Clay Dispersion on Pore Structure and Distribution of Hardened Cement Paste

A review of the effect and optimization of use of nano-TiO2 in cementitious composites

Concrete Performance Attenuation of Mix Nano-SiO2 and Nano-CaCO3 under High Temperature: A Comprehensive Review

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