Evaluation of nano-TiO2 on properties of cementitious mortars

Casagrande, Cézar Augusto; Jochem, Lidiane Fernanda; Repette, Wellington Longuini; Hotza, Dachamir

doi:10.1590/s1517-707620200004.1183

Cited by 8 publications

(10 citation statements)

References 22 publications

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“…Such functionalities have the potential to improve the sustainability of construction materials [45]. Furthermore, despite being chemically inert in terms of its potential to directly react during cement hydration [19,24,40,44,45], nano-titanium dioxide can generally improve the mechanical performance and durability, as well as decrease the rigidity of cementitious materials [20,28,31,35,37,44,[51][52][53][54][55][56]. Moreover, the flexural fatigue performance and abrasion resistance of concretes was reported to be remarkably improved with the use of TiO2 nanoparticles [31].…”

Section: Influence Of Incorporation Of Nano-titania Into Cementitious Compositesmentioning

confidence: 99%

“…Moreover, due to its high specific surface area (SSA), nano-titania reduces the workability of the mixture. Such reduction gets greater with increase of nano-TiO2 content in the mixture [5,20,51,55,63,64]. Although much research has been done related to the incorporation of titania nanoparticles into cementitious materials, there is still big lack of information, which necessitates further investigation.…”

Section: Influence Of Incorporation Of Nano-titania Into Cementitious Compositesmentioning

confidence: 99%

“…Reports that have discussed the effect of NT on fresh properties of cementitious composites show that NT can remarkably decrease the workability. Casagrande et al [51] investigated the effect of NT on the workability of mortar using spread on table test. The results revealed that NT could remarkably decrease the workability of mortar.…”

Section: Effect On Fresh Propertiesmentioning

confidence: 99%

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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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Section: Influence Of Incorporation Of Nano-titania Into Cementitious Compositesmentioning

confidence: 99%

Section: Influence Of Incorporation Of Nano-titania Into Cementitious Compositesmentioning

confidence: 99%

Section: Effect On Fresh Propertiesmentioning

confidence: 99%

See 1 more Smart Citation

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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“…Recently, it was found that various nanomaterials, such as nano-TiO 2 [6,7] and graphene [8,9] could be successfully used to improve the mechanical properties and durability of the mortars [10][11][12]. Nano-TiO 2 has been also proved an excellent photocatalytic material that imparts biocidal, self-cleaning, and smog-abating functionalities when added to cement-based materials [13,14].…”

Section: Introductionmentioning

confidence: 99%

Properties Evolution of Some Hydraulic Mortars Incorporating Graphene Oxides

et al. 2022

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In this experimental study, the mechanical and adhesion properties of several hydraulic lime mortars incorporating graphene oxide (GO)-based nanomaterials were evaluated. Four different composite mortar samples were prepared by adding different percentages of GO-based powders (functionalized), i.e., 1 wt.% GO, 5 wt.% GO, 5wt.% GO-Ag-GO-Fly ash, and 5 wt.% GO-ZnO-GO-TiO2 into the reference mortar sample. The mortar specimens were analyzed through mechanical tests, FT-IR, and SEM. The behavior of selected mortars exposed to chemical attacks was also investigated. The results indicate that the addition of the functionalized GO-based powders leads to a significant improvement in the mortar’s adhesion to the brick substrate (up to 80%) compared to the reference sample, especially in the case of the hydraulic lime mortar incorporating the mixture of GO-Ag and GO-Fly ash, which also showed good resistance to chemical attacks.

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“…Nessa mesma perspectiva, outras áreas da engenharia buscam meios de compatibilizar superfícies por meio de reagentes químicos [7][8][9][10]. Uma necessidade na engenharia de compósitos cimentícios é a utilização de fibras de aço como reforço estrutural [11].…”

Section: Introductionunclassified

Avaliação da funcionalização da superfície de microfibras de aço com Tetraeoxissilano (TEOS) e Glixidoxipropriltrimetoxissilano (GPTMS)

Casagrande,

Jochem,

Repette

2022

Matéria (Rio J.)

Self Cite

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RESUMO Fibras de aço são largamente utilizadas para os mais diversos fins na construção civil. A principal utilização é para reforço estrutural. Nessa aplicação as fibras atuam como ponte de transferência de tensão no compósito por meio do atrito entre a fibra e a matriz. Um meio para potencializar a aplicação de fibras em compósitos cimentícios é a alteração da superfície das fibras por meios físico químicos de modo proporcionar maior interação entre a fibra e a matriz. Neste trabalho é proposto um tratamento químico com dois tipos de silano, o Tetraetoxissilano (TEOS) e o Glicidoxipropiltrimetoxissilano (GPTMS). Foram realizados tratamentos de funcionalização por processo úmido e rota ácida com banhos sequenciais e cura após tratamento com silanos em porções de 1 e 10% em volume na solução e posteriormente analisados por MEV/EDS e método gravimétrico. Foram obtidas fibras de aço com silanos depositados em sua superfície. Foi verificado que quanto maior a concentração do banho de silano, maior é a deposição de silano na superfície das fibras. Em paralelo, verificou-se o aumento expressivo da concentração de silício em função do teor de silano nos banhos de funcionalização. Também se verificou que os filmes de silano quando espessos apresentam fragilidade à abrasão, sendo possível remover parte do filme por meio do atrito entre as fibras.

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Evaluation of nano-TiO2 on properties of cementitious mortars

Cited by 8 publications

References 22 publications

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

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

Properties Evolution of Some Hydraulic Mortars Incorporating Graphene Oxides

Avaliação da funcionalização da superfície de microfibras de aço com Tetraeoxissilano (TEOS) e Glixidoxipropriltrimetoxissilano (GPTMS)

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