Nano-TiO2 particles: a photocatalytic admixture to amp up the performance efficiency of cementitious composites

Naganna, Sujay Raghavendra; Jayakesh, K.; Anand, Vaibhaw

doi:10.1007/s12046-020-01515-x

Cited by 11 publications

(10 citation statements)

References 29 publications

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“…Throughout all the formulations, the cement quantity remained consistent and the superplasticizer dosage was set at 0.5%, expressed as mass percentages relative to the cement amount, in accordance with the relevant literature [6][7][8][9][10][11][12]42,46,47]. Relevant studies in the literature [19,48,49] show that NT present a higher water consumption aspect. To avoid compromising cement hydration-hydrolysis reactions due to water insufficiency resulting from NT absorption, adjustments were made to the water quantity.…”

Section: Fabrication Of Cementitious Compositesmentioning

confidence: 60%

“…Under these conditions, for each percentage of NT added to the mix, an additional 1 g of water per 100 g of cement was required. This resulted in a change in the water/cement ratio from 0.6 in the control mix to 0.625 in the mix with the maximum Relevant studies in the literature [19,48,49] show that NT present a higher water consumption aspect. To avoid compromising cement hydration-hydrolysis reactions due to water insufficiency resulting from NT absorption, adjustments were made to the water quantity.…”

Section: Fabrication Of Cementitious Compositesmentioning

confidence: 99%

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The Influence of TiO2 Nanoparticles on the Physico–Mechanical and Structural Characteristics of Cementitious Materials

Florean,

Vermesan,

Thalmaier

et al. 2024

Coatings

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The urgent need for sustainable construction that corresponds to the three pillars of sustainable development is obvious and continuously requires innovative solutions. Cementitious composites with TiO2 nanoparticles (NT) addition show potential due to their improved durability, physico–mechanical characteristics, and self-cleaning capacity. This study aimed to evaluate the influence of NT on cementitious composites by comparing those with 2%–5% nanoparticles with a similar control sample without nanoparticles, as well as an analysis of cost growth. The experimental results showed an increase in bulk density of the material (4.7%–7.4%), reduction in large pore sizes by min. 12.5%, together with an increase in cumulative volume and cumulative specific surface area of small pore sizes, indicating densification of the material, also supported by SEM, EDS, and XRD analyses indicating acceleration of cement hydration processes with formation of specific products. The changes at microstructural level support the experimental results obtained at macrostructural level, i.e., modest but existent increases in flexural strength (0.6%–7.9%) and compressive strength (0.2%–2.6%) or more significant improvements in abrasion resistance (8.2%–58%) and reduction in water absorption coefficient (37.5%–81.3%). Following the cost–benefit analysis, it was concluded that, for the example case considered of a pedestrian pavement with a surface area of 100 m2, using 100 mm thick slabs, if these slabs were to be made with two layers, the lower layer made of cementitious composite as a reference and the upper layer with a thickness of 10 mm made of cementitious composite with 3% NT or 4% NT, the increase in cost would be acceptable, representing less than 15% compared to the cost for the exclusive use of cementitious composite without NT.

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Section: Fabrication Of Cementitious Compositesmentioning

confidence: 60%

Section: Fabrication Of Cementitious Compositesmentioning

confidence: 99%

The Influence of TiO2 Nanoparticles on the Physico–Mechanical and Structural Characteristics of Cementitious Materials

Florean,

Vermesan,

Thalmaier

et al. 2024

Coatings

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“…One of the main analyses using mercury intrusion porosimetry (MIP) and atomic force microscopy (AFM) revealed that 30 nm of TiO 2 nanoparticles decreased both the porosity and surface roughness in the structure, which resulted in a denser matrix and enhanced the overall durability performance [64]. In the same context, durability and strength were evaluated in the study by Naganna et al [65] regarding the potential of incorporating nano-TiO 2 particles into cement to create mortar and concrete with reduced permeability. In their findings, adding nano-TiO 2 into concrete specimens significantly mitigated the roughness and surface defects of coarse aggregates and improved the strength and durability characteristics (when added as a substitution of cement in quantities up to 8%) [65].…”

Section: Overview Of the Existing Researchmentioning

confidence: 99%

TiO2-Based Mortars for Rendering Building Envelopes: A Review of the Surface Finishing for Sustainability

Bersch,

Picanço Casarin,

Maia

et al. 2023

Sustainability

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Building envelopes coated with TiO2-based mortars benefit from depolluting, antibiological and self-cleaning effects. Therefore, photocatalytic renders are allies in the quest for sustainability in the built environment, potentially combatting atmospheric pollution, enhancing durability and reducing maintenance needs. Surface finishing characteristics of the renders influence their photocatalytic efficiency and esthetic and functional properties. In this context, this study reviews the existing literature, focusing on proven surface-affecting parameters, the surface and color of TiO2-based mortars, to explore their impacts on photoactive behavior. The incorporation of TiO2 within an additional surface layer and its mixture into the mortar in bulk were observed for surface roughness. Mainly the addition of TiO2 during casting was identified in colored mortars. Generally, a moderate surface roughness led to better photoactivity; microroughness affected self-cleaning by facilitating dirt deposition. The interaction between the surface roughness and the photocatalytic layer affected the water contact angle, regarding superhydrophilicity or superhydrophobicity. The photoactivity of colored mortars with TiO2 depended on the color and amount of the added pigments, which influenced electron–hole recombination, physically occupied active sites or, on the other hand, led to a higher formation of reactive radicals. Surface finishing can thus be designed to enhance the photoactivity of TiO2-based mortars, which is fundamental for current climate concerns and emphasizes the need for life cycle assessments and environmental protection.

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“…However, recycled concrete powders (RCP) have not been effectively utilized due to their uneven fineness and complex composition; only a small amount is used for supplementary cementitious material (SCM). Some concrete test methods have also been used for various types of concrete with different waste or by-products (steel slag, incinerator bottom ash) [11,12]. A review by Ye et al [13] highlighted the increased interest in alkali-activated recycled concrete powders cement (AARCPC) as a sustainable approach for improving the properties of RCP.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Mineral Admixtures on Mechanical Properties of Alkali-Activated Recycled Concrete Powders Cement

et al. 2022

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Recycled concrete powders (RCPs) are collected during the treatment of recycled aggregates using devices that suction dust. However, RCPs have not been effectively utilized as mineral admixtures in concrete due to their low activity and high capacity for water absorption. In this study, alkali-activated recycled concrete powders cement (AARCPC) was prepared using chemical activation, and then the composition, fluidity, setting time, strength and micro-structure of hydration products in AARCPC were studied. We found that the addition of mineral admixtures significantly improved the strength of hardened paste at various ages, and that the effect of slag powders on the mechanical properties was significantly better than that of fly ash. Replacing AARCPC with 50% slag caused the 28 d and 90 d compressive strength of pastes to reach 79.5 and 84.4 MPa, respectively. The optimal ratio of the various minerals that make up AARCPC was 60% recycled concrete powder, 20% slag powder and 20% fly ash. In particular, hydration with fly ash and slag of AARCPC promotes better fluidity and compactness. AARCPC showed higher strength and has the potential to replace Portland cement and be applied to concrete.

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Nano-TiO2 particles: a photocatalytic admixture to amp up the performance efficiency of cementitious composites

Cited by 11 publications

References 29 publications

The Influence of TiO2 Nanoparticles on the Physico–Mechanical and Structural Characteristics of Cementitious Materials

The Influence of TiO2 Nanoparticles on the Physico–Mechanical and Structural Characteristics of Cementitious Materials

TiO2-Based Mortars for Rendering Building Envelopes: A Review of the Surface Finishing for Sustainability

Investigation of Mineral Admixtures on Mechanical Properties of Alkali-Activated Recycled Concrete Powders Cement

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