Influence Of Nanosilica Research Articles

Nanosilica-enhanced geopolymer cementitious materials: Mechanistic insights from experimental and computational simulations

To mitigate the pollution associated with municipal solid waste incineration fly ash (MSW-IFA), solidification/stabilization (S/S) techniques have garnered considerable attention. This study systematically investigates the modification effects of nanosilica (NS) on the properties of geopolymer functional cementitious materials (GFCM) derived from waste fly ash. By integrating experimental data with simulation-based calculations, the influence of NS on the macroscopic properties and microstructure of GFCM, including mechanical performance, heavy metal immobilization mechanisms, and hydration processes, was examined. The results indicate that NS enhances mineral phase and pore structure through pozzolanic and filling effects, promoting additional C-S-H gel formation and pore filling, which significantly accelerates the hydration process and improves mechanical properties. Furthermore, NS increases the proportion of heavy metals in a stable state, thereby reducing their leaching potential. Density functional theory (DFT) calculations further revealed that NS's modification effects primarily occur via filling, nucleation, and pozzolanic activity, which supported the construction of a geopolymer reaction network. This study offers a validated approach for advancing the understanding of NS modification mechanisms, the development of geopolymer reaction networks, and the mechanisms governing heavy metal S/S.

Influence of Nanosilica and Ground Granulated Blast Furnace Slag on Mechanical and Durability Properties of Blended Concrete over Varied Fire Durations

Influence of Nanosilica and Ground Granulated Blast Furnace Slag on Mechanical and Durability Properties of Blended Concrete over Varied Fire Durations

Influence of nanosilica and chain extender on the mechanical behavior of poly(lactic acid)/poly(butylene adipate‐co‐terephthalate) blends

AbstractThe effect of incorporating different percentages of hydrophobic and hydrophilic nanosilica (HPB and HPL NS) particles and chain extender (CE) on the mechanical behavior of poly(lactic acid)/poly(butylene adipate‐co‐terephthalate) (PLA/PBAT) blends was evaluated. The mechanical behavior of the samples was explained using different theoretical models. Microscopic studies showed that adding both types of NS particles and CE led to more uneven surfaces for blends. Also, no obvious aggregations were observed in both blend nanocomposites, and both kinds of NS particles were mainly present in the PBAT phase. Except for the blend containing 1 phr HPB NS particles, which revealed a continuous morphology, all the PLA/PBAT blends containing both types of NS particles indicated a droplet‐matrix morphology. The more the NS content, the more uniform the PBAT distribution. Adding CE in the blends improved Young's modulus, yield strength, and elongation‐at‐break to a particular loading of CE (2 phr), while these properties were diminished after introducing more CE. Also, the most improvements in the yield strength (45%) and Young's modulus (35%) were seen for the PLA/PBAT (75/25 w/w) containing 2 phr CE and 5 phr HPL NS particles. Besides, a good agreement was observed for experimental values and theoretical models for all samples.

The Influence of Nano Silica and Micro Silica on the Compressive Strength of Hybrid Fiber-Reinforced Concrete

The Influence of Nano Silica and Micro Silica on the Compressive Strength of Hybrid Fiber-Reinforced Concrete

Influence of Nano Silica On Properties of Cement Concrete

Influence of Nano Silica On Properties of Cement Concrete

Influence of nano silica and crumb rubber on the physical and durability characteristics of concrete

Influence of nano silica and crumb rubber on the physical and durability characteristics of concrete

Influence of nanosilica on the acoustic properties of epoxy and evaluation of the composite as a coating for aircraft panels

The present research work involves a systematic investigation to evaluate the influence of epoxy/nanosilica coating on vibro-acoustic characteristics of aircraft panels. Impedance tube-based Sound Transmission Loss (STL) and Sound Absorption Coefficient (SAC) measurements are performed for different weight percentages of nano silica (NS) in epoxy (1%, 2.5%, 4%, 5.5%, 7% NS) at low-mid and high-frequency segments. The optimal wt% of nanosilica in Araldite LY556, which exhibits better soundproofing in terms of SAC and STL at low-mid and high-frequency regions, is determined. 4% NS exhibited the highest STL value of 60 dB at 805 Hz in the low-mid-frequency band and 55 dB at 4900 Hz in the high-frequency band. In case of sound absorption, the highest SAC of 0.62 at 1370 Hz in low-mid-frequency band and 0.34 at 3112 Hz in the high-frequency band was achieved for the 4% NS sample. Hence, 4% NS is the optimum weight percentage to be used as a coating on the AA 2024-T3 aircraft panel. Owing to the high STL performance of the said sample, it is considered that epoxy - nanosilica exhibits better sound insulation than sound absorption performance. It is observed that the coated AA 2024-T3 sample exhibits better STL of 32.5 dB at 820 Hz in the low-mid-frequency range and 50 dB at 5000 Hz in the high-frequency range. The goal of the research to decrease noise effects experienced in fuselage cabin panels at the engine region of aircraft is validated, and it can be achieved by using Araldite LY556 – 4% NS polymer nanocomposite coating on aircraft panels.

Influence of nano silica on impact resistance and durability of fly ash concrete in structural buildings

Influence of nano silica on impact resistance and durability of fly ash concrete in structural buildings

Influence of nano-silica and shredded plastics in pervious concrete

Influence of nano-silica and shredded plastics in pervious concrete

Influence of nanosilica and polypropylene fibers on the permeability, compressive and flexural strength of pervious concrete

The article examines the importance of pervious concrete in construction, emphasizing the need to balance the required permeability with necessary strength. The incorporation of nanosilica and polypropylene fibers into pervious concrete was evaluated, considering compressive and flexural strength, void percentage, and permeability. The methodology included an experimental mix design and specific tests. The results showed significant improvements in the properties of pervious concrete. For instance, compressive strength increased from 128.01 kg/cm² in the standard concrete to 216.08 kg/cm² with the addition of 0.12% polypropylene and 1% nanosilica. Similarly, flexural strength exhibited substantial increases, from 18.76 kg/cm² in the standard to 34.11 kg/cm² and 43.42 kg/cm² with the respective dosages. Regarding permeability, the coefficient decreased from 2.60 cm/s in the standard concrete to 2.50 cm/s with the addition of 0.12% polypropylene and 1% nanosilica. In summary, the research supports the effectiveness of these additives in enhancing the performance of pervious concrete, with improvements of up to 68.8% in compressive strength and 131.4% in flexural strength.

Effect of Nano-Silica on the Mechanical and Durability Properties of Concrete: A Comprehensive Review

Abstract: The incorporation of nanotechnology has led to significant strides in the concrete industry, ushering in innovative construction methodologies. Various nanomaterials, including nano-silica (NS), have undergone comprehensive scrutiny as potential partial substitutes for cement in concrete formulations. This article aims to provide a comprehensive overview of the impacts of NS on several mechanical properties of concrete, encompassing compressive, split tensile, and flexural strengths. Additionally, the review delves into the influence of NS on the concrete’s durability, including microstructural characterization and the eradication of structural micropores.

Influence of nanosilica in the chloride binding capacity of sustainables ground blast furnace slag and metakaolin

This work investigates the chloride binding capacity combine of two sustainable pozzolanic additions such as granulated blast furnace slag (G) and metakaolin (M) used in cement to decrease its carbon footprint. They are also combined with two nanosilicas with different specific surface area (O and A). Blends of alone M or G and with nanosilica are mixed in water with Ca(OH)2 and chloride (C) to compare chloride binding capacity of both in presence or not of nanosilica. Blends are analysed by XRD, FTIR, DTA–TG and chloride binding capacity is determined too by potentriometric titration with AgNO3. The addition of chlorides to both pozzolanic M and G indicates that M shows higher chloride binding capacity than G although very similar Friedel's salt formation, indicating a higher physisorbed chlorides contain. Chlorides addition meaningfully replaces carbonates in carboaluminates phases to form Friedel's salt, being this exchange higher for samples with M than for G blends. The combination of experimental techniques used in this study have shown that the effect of nanosilica addition to samples with M and G show an opposite effect in Friedel's salt formation, increasing for samples with G and decreasing for samples that contain M.

On the rheological, fresh and strength effects of using nano-silica added geopolymer grout for grouting columns

In this article, the influence of nano-silica (NS) added geopolymer-based grout (GBG) mixtures for use in grouting columns was investigated experimentally. For this purpose, the rheological characteristics (shear stress, apparent viscosity, yield stress, plastic viscosity and rheological behaviour) of GBG mixtures obtained with nano-silica (NS) together with fly ash (FA) replacements were measured at a wide range of NS dosages of 0% (only FA for control), 0.5%, 1.0%, 1.5%, 2.0% and 2.5%, and extensive effects of water to binder (w/b) ratios (w/b = 0.50, 0.75, 1.00, 1.25, and 1.50), by dry weight. From a proper and common consistency of water effects (w/b = 1.00), the fresh state properties (mini-slump, Marsh funnel viscometer and bleeding) and unconfined compressive strength (UCS) performance of geopolymer grouting columns were tested. Results of the study indicated that incorporating NS into GBG mixtures had positive effects on the rheological characteristics. The mini-slump and flow time of the Marsh funnel increased slightly with NS dosages up to the rate of 1.5% while increasing the NS proportions led to a reduction of bleeding that was prominent beyond 1.5%NS. Among the treatments of geopolymer mixtures with NS, the highest UCS performance was obtained at the dosage rate of 1.5%NS.

Influence of Nanosilica and Superplasticizer Incorporation on the Hydration, Strength, and Microstructure of Calcium Sulfoaluminate Cement Pastes

Influence of Nanosilica and Superplasticizer Incorporation on the Hydration, Strength, and Microstructure of Calcium Sulfoaluminate Cement Pastes

Influence of Nanosilica and Layering Sequence on the Mechanical Properties of Kenaf and Banyan Fibers Reinforced Composites

Influence of Nanosilica and Layering Sequence on the Mechanical Properties of Kenaf and Banyan Fibers Reinforced Composites

Influence of nanosilica on properties of soil

Influence of nanosilica on properties of soil

The Influence of Nano-Silica on Some Properties of Light Weight Self-Compacting Concrete Aggregate

Lightweight concrete (LWC) has been used successfully in building constructions for many years due to its physical properties and its lightweight with high thermal insulation and durability. Recently, this work was done on a new type of concrete: lightweight self-compacting concrete (LWSCC) that combines the feature of lightweight and self-compacting concrete simultaneously. In this study, light expanded clay aggregate (LECA) was used as coarse aggregate in (LWSCC) mixtures, using nano-silica as a partial replacement of cement with three percent (0.5, 0.75, and 1%) by mass of cement. They were tested to evaluate these values of fresh characteristics through slump flow time and diameter, L-box, and segregation tests. The results of the fresh concrete tests showed a decrease in the workability of the concrete in the mixtures containing nano-silica due to the increase in fine materials in the mixture. The effects of nano-silica on the hardened properties of (LWSCC) such as compressive strength, flexural strength, splitting tensile strength, oven-dry density, and scanning electron microscopy (SEM), have improved. The mixtures containing nano-silica were investigated and compared with the reference mixture, where the results of the tests showed a significant improvement in the mechanical properties by (17.35, 16.27, 11.73, and 3.82%) for each of the compressive strength, flexural strength, splitting tensile strength and oven dry density respectively. In the presence of nano-silica, the replacement percentage of 1% recorded the best results in all tests at 90 days of curing.

The Influence of Nanosilica on Properties of Cement Based on Tetracalcium Phosphate/Monetite Mixture with Addition of Magnesium Pyrophoshate.

The effect of nanosilica on the microstructure setting process of tetracalcium phosphate/nanomonetite calcium phosphate cement mixture (CPC) with the addition of 5 wt% of magnesium pyrophosphate (assigned as CT5MP) and osteogenic differentiation of mesenchymal stem cells cultured in cement extracts were studied. A more compact microstructure was observed in CT5MP cement with 0.5 wt% addition of nanosilica (CT5MP1Si) due to the synergistic effect of Mg2P2O7 particles, which strengthened the cement matrix and nanosilica, which supported gradual growth and recrystallization of HAP particles to form compact agglomerates. The addition of 0.5 wt% of nanosilica to CT5MP cement caused an increase in CS from 18 to 24 MPa while the setting time increased almost twofold. It was verified that adding nanosilica to CPC cement, even in a low amount (0.5 and 1 wt% of nanosilica), positively affected the injectability of cement pastes and differentiation of cells with upregulation of osteogenic markers in cells cultured in cement extracts. Results revealed appropriate properties of these types of cement for filling bone defects.

Experimental Analysis of Mechanical and Thermal Characteristics of Luffa/Epoxy Polymer Composite under the Influence of Nanosilica

In the current work, the experimentations have been accomplished to assess the impact of diffusing nanosilica particles in epoxy matrix on the mechanical and thermal performance of the luffa fibre reinforced epoxy composite material. The matrix and fibre composition are fixed as 80 : 20 throughout the study, and the nanosilica is disbanded in diversified volume fractions of 0%, 0.5%, 1.0%, 1.5%, 2.0%, and 2.5%, respectively, while preparing luffa/epoxy/nanosilica (LES) composite samples. The mechanical characteristics, such as tensile, flexural, and impact behaviour of the composite, and the thermal properties, namely, thermal stability and thermal conductivity, are examined for the LES samples. The experiments are accomplished as per the ASTM standards. The results revealed that the assimilation of nanosilica particles in epoxy has improved the mechanical and thermal characteristics of the composite significantly. The tensile, flexural, and impact strength of the composite have been amended by 157.58%, 66.9%, and 16.5% with 1.5% addition of nanosilica in epoxy. Similarly, thermal conductivity of the composite is improved by 47.53% with the dispersion of 2.5% nanosilica in epoxy matrix. In addition, the thermal stability of the LES composite samples is substantially improved while disbanding nanosilica in epoxy matrix. However, the better results are reported for the LES composites containing 1.5% nanosilica content, compared to the next higher volume fractions of nanosilica content in epoxy matrix.

Influence of Nano-Silica on the Mechanical Properties of Jute/Glass Fiber Reinforced Epoxy Hybrid Composites

Natural composites have gained importance recently due to increasing environmental factors and relatively low cost. Although their biodegradability, low density, and high processability, the use of natural fibers in composite materials as the only reinforcement phase faces with some challenges due to their disadvantages such as high moisture absorption and low mechanical properties. To overcome these issues, the natural fibers are generally utilized in composite materials by synthesizing with synthetic fibers. In this context, jute/epoxy composites have been hybridized with glass fiber layers and nano-silica particles to improve low mechanical properties, and the contributions of hybridization on mechanical properties are investigated through performing tensile, bending, and impact tests. Nano-silica particles in the ratio of 1%, 2%, and 3% by weight have been used in composite production. Three different hybrid configurations (G1J6G1, J3G2J3, J2G1J2G1J2) are tested as well as pure jute/epoxy and pure glass/epoxy composites. According to the experimental results, nano-silica additive has a significant effect on both non-hybrid and hybrid fiber reinforced composites. By using the glass fiber layer on the outer surface, the
 highest tensile strength, flexural strength, and impact behavior have been achieved in the G1J6G1 hybrid configuration.