Effect of nano-silica on Portland cement matrix

Mendes, Thiago Melanda; Repette, Wellington Longuini

doi:10.1590/s1983-41952019000600009

Cited by 9 publications

(14 citation statements)

References 20 publications

(33 reference statements)

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“…So that the density may be increased because of the lower pore (void) amount in the concrete matrix than that in the control mix, or this is caused by a higher degree of structure tightness by introducing a very fine material which fills the pores and gives more dense structure compared with the concrete mixture without nanoparticles. These results are in agreement with those [25] and Mendes and Repette (2019) [26]. Mix 1:1:2 also showed higher density values compared to 1:1.5:3 and 1:2:4, respectively, due to the formation of more cement paste in mixes with a higher cement/aggregate ratio, which gives the dense concrete structure.…”

Section: Results Of Dry Density Testsupporting

confidence: 91%

Investigation of the Effect of Addition Nano-papyrus Cane on the Mechanical Properties of Concrete

et al. 2021

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This paper investigates the effect of nano-papyrus cane ash as an additive on concretes’ mechanical and physical properties. Three types of concrete mixtures, 1:2:4, 1:1.5:3, and 1:1:2 were prepared for each mixture, nano-papyrus ash was added in five different dosages of 0.75, 1.5, 3, 4.5, and 6% by weight of cement; therefore, eighteen mixes would be studied in this work. Physical properties represented by dry density and slump were also measured for each mix. Moreover, to evaluate the mechanical properties development split tensile strength and compressive strength were obtained at age (7 and 28). Results manifested that the adding of nano ash developed the compressive strength and split tensile strength of concrete and the maximum enhancement recognized in the mixes with a content of 4.5% nano-papyrus in each studied mixture in this work. The slump test results indicated that the workability of concrete increased with adding nano-papyrus ash gradually with increasing nanoparticles' content. As well as, dry density was significant increased with nano-papyrus ratio; greater values were recorded in mixtures with 1.5-4.5% content of nano-papyrus. When comparing the concrete mixes used, it was found that the best results were obtained with 1:1:2 mixtures. This remarkable improvement in concrete properties considers the nano-papyrus is considered a cement economical and useful replacement for traditional construction material. Doi: 10.28991/cej-2021-03091649 Full Text: PDF

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Section: Results Of Dry Density Testsupporting

confidence: 91%

Investigation of the Effect of Addition Nano-papyrus Cane on the Mechanical Properties of Concrete

et al. 2021

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“…Surfaces containing NTPs are in practice in various civil engineering fields e.g. in buildings concrete blocks, plasters, windows and ceramic tiles and in roads in the production of asphalt and road signs [7,[96][97][98]. A brief list of industrial applications of NTPs is presented in Table 2.…”

Section: Applications Of Ntpsmentioning

confidence: 99%

Synthesis and Applications of Nano Titania Particles: A Review

Khitab

Ahmad

Munir

et al. 2018

Reviews on Advanced Materials Science

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This paper reviews the synthesis methods of nano titania particles and their utilization in various applications with concise discussion on the related health concerns. Owing to the efficient photocatalytic properties of nano titania particles along with high stability, super hydrophilicity and low cost, these particles are perfect candidate for the production for coatings on the surfaces of construction materials i.e. tiles, facades, wall etc. The nano titania coatings are capable of decomposing dust, dirt and organic pollutants in the presence of sunlight. These decomposed products may then easily be washed away by rinsing thus providing easy cleaning and keeps the buildings in younger or fresh look for decades.

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“…The SEM micrographies published by Xu, Liu, Guo, Du and Hou (2012) also showed a three-dimensional porous structure of colloidal silica in a ceramic matrix. The results of mercury intrusion porosimetry published by Mendes and Repette (2019) showed this modification in the nanometric pores, according to the content of nano-silica. The microstructure observed in Portland cement pastes containing nano-silica suggests: in an initial condition, for a very low volume; nano-silica can be adsorbed to layers on the surface of Portland cement.…”

Section: Resultsmentioning

confidence: 94%

Nano-silica added to Portland cement

Mendes¹,

Repette²

2021

Acta Sci Technol

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For a controlled particle size distribution, nano-silica was added to three different cements. The chemical and mineralogical compositions of the cements were characterized by fluorescence and X-ray diffraction. The granulometric distributions of cements and nano-silicas were obtained by laser granulometry and dynamic lightning scattering. The specific surface area of the raw materials was determined by gas adsorption. The effect of nano-silica and type of cement on rheological behavior was evaluated by rotational rheometry. The mechanical performance was investigated through the compression strength. The microstructural analysis was performed by scanning electron microscopy. The water demand and the consumption of dispersant increases according to the nano-silica content. The reduction in the inter-particle separation, and the agglomeration of nano-silica led to an increase in the viscosity of the suspension. The mechanical performance was directly affected by the specific surface area of the cements. Microstructural analysis showed that nano-silica changed from a layered adsorbed structure, to a porous or agglomerated structure.

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Effect of nano-silica on Portland cement matrix

Cited by 9 publications

References 20 publications

Investigation of the Effect of Addition Nano-papyrus Cane on the Mechanical Properties of Concrete

Investigation of the Effect of Addition Nano-papyrus Cane on the Mechanical Properties of Concrete

Synthesis and Applications of Nano Titania Particles: A Review

Nano-silica added to Portland cement

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