A Review of the Effect of Nano-Silica on the Mechanical and Durability Properties of Cementitious Composites

AlTawaiha, Haneen; Alhomaidat, Fadi; Eljufout, Tamer

doi:10.3390/infrastructures8090132

Cited by 14 publications

(13 citation statements)

References 92 publications

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Section: Materials Scienceunclassified

“…Отходы собираются в виде влажных или сухих порошков [1][2][3][4][5][6][7]. По оценкам [1,2,6,7] при производстве металлического кремния ежегодно образуется более 100 000 тонн отходов [7]. Несмотря на значительные усилия по снижению их вредного воздействия на окружающую среду, не существует возможности предотвратить загрязнение почвы и подземных вод.…”

Section: Materials Scienceunclassified

“…Несмотря на значительные усилия по снижению их вредного воздействия на окружающую среду, не существует возможности предотвратить загрязнение почвы и подземных вод. В настоящее время в РФ проводятся работы по использованию промышленных отходов в качестве модифицирующих добавок в различных отраслях, например в строительстве [4][5][6] и металлургии [1,2,7].…”

Section: Materials Scienceunclassified

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Study of the effect of a combined modifier from silicon production waste on the properties of gray cast iron

Karlina,

Kondratiev,

Sysoev

et al. 2024

Metal Working and Material Science

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Introduction. During the metallurgical production of silicon, waste is generated that accumulates in dumps, causing harm to the environment. Disposal and recycling of solid waste from silicon production is especially important because They contain important chemical compounds (silicon dioxide, silicon carbide, carbon nanotubes) that can be used in other industries, which will bring greater economic value. Considering the possibilities for extracting these useful components from silicon production waste, it is necessary to bring processing technologies to the stage of widespread practical application. Therefore, the development of a special waste processing technology to obtain a useful product in the form of a composition of silicon dioxide and silicon carbide remains an urgent problem. Purpose of the work: to study the formation of the morphological form of graphite with the introduction of nano-modifiers from silicon production waste. The work examined samples of gray cast iron after modification with a combined modifier obtained from silicon production waste. The research methods are mechanical tests for statistical tension, analysis of the chemical composition and metallographic studies. Results and discussion. It was revealed that the mechanical properties of gray cast iron increased by 30-50% after modification with a combined modifier, compared with witness samples. The morphology of graphite is an important parameter affecting the properties of cast iron. It has been established that during the modification process the morphology of graphite changes from lamellar to vermicular. Specimens of gray cast iron with vermicular form of graphite have high strength values compared to specimens of gray cast iron with lamellar form of graphite. The presented results confirm the promise of the developed approach aimed at obtaining new classes of modifiers and products made of gray cast iron with a high range of mechanical properties.

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Section: Materials Scienceunclassified

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Study of the effect of a combined modifier from silicon production waste on the properties of gray cast iron

Karlina,

Kondratiev,

Sysoev

et al. 2024

Metal Working and Material Science

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“…Nanomaterials are substances that have been reduced in size to a range of 1–100 nm or possess at least one dimension within this nanoscale range in a three-dimensional space . The introduction of nanotechnology and the use of nanomaterials in oil well cement slurry preparation led to considerable improvement in the cement slurry and cement matrix properties because of the small size, and the unique characteristics possessed by nanoparticles comprise greater surface area per unit volume. − A comparison of surface area to volume ratio attributed to the different radius size of spherical particles are presented by Amanullah and Al-Tahini …”

Section: Introductionmentioning

confidence: 99%

Properties and Performance of Oil Well Slurry and Cement Sheath Incorporating Nano Silica: A Review

Mahmoud,

Elkatatny

2024

ACS Omega

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The oil well cementing job is the operation in which a cement paste is pumped to fill the annulus behind the casing. Inclusion of nanomaterials in oil well cement results in improving the cement properties. This paper provides a comprehensive overview of incorporating nanosilica into oil well cement, addressing various aspects of the nanosilica manufacturing process, dispersion challenges, the impact on cement hydration and properties, as well as the operational challenges. The addition of nanosilica is found to enhance cement properties such as hydration rate, compressive strength at low temperatures, and resistance to deterioration at high temperatures. However, challenges arise, including increased viscosity and the need for higher water content. Dispersion of nanosilica into cement slurry remains a difficulty, compounded by the high manufacturing cost, limiting its practical application. The paper recommends further research to improve nanosilica dispersion, explore cost-effective raw materials, and overcome operational challenges for broader utilization in oil well cementing.

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“…These reactions are usually performed with ethanol or methanol [17]. Therefore, it is necessary to change the water-cement ratio [18,19].…”

Section: Introductionmentioning

confidence: 99%

Mechanical and Thermal Properties of an Energy-Efficient Cement Composite Incorporating Silica Aerogel

Koriakovtseva,

Dontsova,

Nemova

2024

Buildings

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The thermal performance of the building envelope is significant in energy-efficient construction. Because concrete is widely used in civil engineering, options to reduce its R-value should be considered. This study explores the thermal and structural properties of aerogel-enhanced concrete. Silica aerogel powder was mixed with fine-grained concrete at 15 vol.%. Two series of samples were prepared to identify the preferred technology. The first series of samples were mixed without isopropyl alcohol; for the second series, the alcohol was mixed with silica aerogel before mixing into the dry mix. The thermal conductivity, compressive strength, and bending resistance of the specimens were measured. The presence of silica aerogel admix resulted in a decrease in the compressive strength of the specimens by 30% compared with that of the reference samples and a reduction in the bending strength of the samples by 9% compared with that of the reference samples. For the first and second series of samples, the K-values of the aerogel-enhanced specimens varied in the range from 0.83 W/(m·K) to 1.13 W/(m·K), respectively. To further decrease the thermal conductivity, gypsum putty was then added to the specimens, resulting in the K-values further decreasing to 0.64 W/(m·K) and 0.84 W/(m·K), respectively. The calculation of heat losses through 1 m2 of the aerogel-enhanced concrete wall was performed. It has been shown that energy expenses for heating can be lowered by 30%. The calculation of the greenhouse gas emissions from the combustion of fuel required for heating was also considered. The emissions decreased by 30.2% compared with the reference sample. Microscopic examination of the face and section surfaces of the sample revealed a significant number of pores compared with conventional fine-grain concrete.

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A Review of the Effect of Nano-Silica on the Mechanical and Durability Properties of Cementitious Composites

Cited by 14 publications

References 92 publications

Study of the effect of a combined modifier from silicon production waste on the properties of gray cast iron

Study of the effect of a combined modifier from silicon production waste on the properties of gray cast iron

Properties and Performance of Oil Well Slurry and Cement Sheath Incorporating Nano Silica: A Review

Mechanical and Thermal Properties of an Energy-Efficient Cement Composite Incorporating Silica Aerogel

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