Effect of silica fume content and type on the abrasion resistance strength. The silica fume type has a certain influence on the abrasion resistance of LHP cement concrete. As shown in Fig. 8, the abrasion resistance of concrete mixed with Si-Ⅱ was generally higher than that of concrete mixed with Si-Ⅰ, ...
The purpose of the current paper is studying the scratch and abrasion resistance of the acrylic-based polyurethane nano-particulate clearcoats reinforced by the two types of fumed and precipitated nano-silica reinforcements. To do this, scanning electron microscope (SEM), transmission electron microscope (TEM), scratch and pin …
The broad XRD band is located in the 2θ region of 15° to 35°. This confirms that the physical state of both silica types is entirely amorphous and there is no significant difference in the crystalline structure. ) precipitated silica (Ultrasil-VN3) and () in-situ …
This investigation evaluated the resistance to abrasion of concrete proportioned to have four levels of fine aggregate replacement (5%, 10%, 15%, and 20%) with silica fume. Control mixtures containing no silica fume were also used for comparison purposes. Three cement factors, namely, 500 lb/cu yd (900 kg/cu m), 650 lb/cu yd (1,157 kg/cu m ...
The rebound resilience decreased and tan delta value improved with increasing silica content. The abradability continuously decreased with concomitant increase in the side coefficient force. The fatigue resistance was found to be better at higher silica loading. The silica particles due to its surface structure helps in crack arresting.
The utilization of 5 wt% silica fume together with 20 wt% fly ash as cement replacement enhances the abrasion resistance of concrete by about 4–9% at various ages. Beside improved mechanical properties, many studies reveal that the utilization of fly ash and silica fume also led to better acid resistance through lower calcium content and …
The influence of nano-silica addition on the durability of concrete has been studied. Nano-silica particles (0 to 3 wt%) by cement were incorporated i…
R-squared values for abrasion resistance were found to be 59.7% and 65.9% suggesting that additional factors exist (Appendix B) Table 3. Interestingly, temperature seems to have little impact on the abrasion resistance of the films and may actually decrease mechanical performance at higher temperature.
The main objective of the current research work is to explore the effect of nanosilica particles on the compound EPDM/SBR-SiO2 (ethylene-propylene-diene …
Silica antireflective coatings with hydrophobic and abrasion-resistant property have been prepared by the acid catalyzed sol–gel method and TMCS treatment process. 25 g/L template concentration is the optimum point for monolayer AR coating, of which transmittance and WCA are 97.6% and 85°, respectively. The design of bilayer …
Carbon black is the generic name for a family of small-size, mostly amorphous, or paracrystalline carbon particles grown together to aggregates of different sizes and shapes and is a modification of carbon …
Organic-inorganic hybrid composites were prepared by the sol-gel method for the hard coating agent of transparent plastic, and their abrasion resistance, optical and surface characteristics were evaluated. Methyltriethoxy-silane (MTES) and colloidal silica were used as starting materials. The addition of MTES to colloidal silica enabled the …
In this study, portland cement (PC) has been partially replaced with a Class F fly ash (FA) at level of 70 % to produce high-volume FA (HVFA) concrete (F70). F70 was modified by replacing FA at levels of 10 and 20 % with silica fume (SF) and ground granulated blast-furnace slag (GGBS) and their equally combinations. All HVFA …
A comparative study of the cure characteristics, mechanical properties and abrasion resistance of silica and carbon black filled NBR/SBR Blends July 2017 Egyptian Journal of Chemistry 60(5)
A double-layer broadband antireflective (AR) coating was prepared on glass substrate via sol-gel process using two kinds of acid-catalyzed TEOS-derived silica sols. The relative dense layer with a porosity of ∼10% was obtained from an as-prepared sol, while the porous layer with a porosity of ∼55% w …
At a low silica content (5–15%), the viscosity is constant and close to that of water. Silica particles are in a flocculated state in this dilute regime. Additionally, a low …
LB designs and manufactures primary and secondary milling systems to process many materials in different industrial sectors. The LB production lines dedicated to milling are used particularly when processing sand, calcium carbonate, clay and other raw materials with different hardness or abrasion levels, or to reuse industrial waste or to grind ...
Abrasion resistance of polyurethane clearcoats is significantly enhanced by nano-silica additives. •. Scratch, abrasion, SEM & TEM results are presented. •. The effect of different weight fractions and applied abrasion forces is evaluated. •. Abrasion resistance improvement is discussed using wear mechanisms. •.
In tire tread applications, achieving enhanced abrasion resistance, wet grip, and rolling resistance is crucial for optimizing overall performance. To realize …
PMMA plates were tested in a toothbrush simulator with distilled water and four model toothpastes with increasing content of hydrated silica (2.5, 5.0, 7.5, 10.0 wt%). The viscosity of the model toothpaste formulations was kept constant by means of varying the content of sodium carboxymethyl cellulose and water.
For instance, the surface hardness and abrasion resistance of polyurethane coatings showed an optimal level of enhancement with a silica content of 3.0 wt% [13], and their abrasion resistance could be further improved by the addition of silane coupling agents (SCAs) [1], [14]. In most cases, uniform dispersion of silica nanoparticles within …
Rahmanzadeh et al. [114] kept the content of nano-silica at 5%, changed the water-cement ratio, and studied its abrasion resistance, the results showed that the abrasion resistance of concrete ...
To enhance the efficiency of solar cells, a broadband double-layer antireflective (AR) coating with excellent transmittance and abrasion-resistance, was successfully fabricated using two layer mesoporous silica coatings. Both layers were prepared via a solvent evaporation self-assembly method in which the top- and
The surfaces with a higher nano-silica content show a higher resilience against the surface crackings and suggest far better surface finish. The presence of the nano silica particles improve the tribological properties, which in turn protects the surface against harsh weathering conditions [33]. The eroded surfaces of the neat PU samples ...
The abrasion resistance of the PAE/SiO 2 hybrid coatings was improved with the addition of nano-silica particles; the optimal SiO 2 content was identified. When adding 5 and 10 phr nano-silica particles, GR values of the PAE/SiO 2 -5 and PAE/SiO 2 -10 coatings increase to 92.9 and 95.9 %, respectively, from the 89.4 % of the neat PAE …
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include calcium carbonate, dehydrated silica gels, hydrated aluminum oxides, magnesium carbonate, phosphate ... (but also in the literature known as radioactive dentin abrasion.) These are RDA values for common toothpaste: 0-70= low abrasive, 70-100= medium abrasive, 100-150= highly abrasive, 150-250= regarded as harmful limit.
Sustainable and long-time 'rejuvenation' of biomimetic water-repellent silica coating on polyester fabrics induced by rough mechanical abrasion. ... Table 4 shows that the carbon content decreased from ∼76% in unmodified fabric to ∼52.5% in the coated homologue and then increased to 62.5% after tape peeling. ... During abrasion tests ...
The optimal set of functional properties was obtained with a silica content of 3 wt%. In this case, the resin had the appropriate viscosity, degree of cross-linking, hardness (90 ShD), tensile ...
autoclaved aerated concrete: 20% to 40%. concrete: less than 30%. brick: 5% to 15%. Additionally, below are typical crystalline silica content ranges for some common natural dimension stone products: Quartzite and sandstone: 20% to 95%. Granite: 5% to 50%. Bluestone and basalt: typically less than 10%. Limestone: typically less than …
The nano-silica content has obvious effect on the thermal, mechanical, optical, and anti-abrasion properties of PAE/ SiO 2 hybrid coatings. With the consideration of all the properties of hybrid coatings, the PAE/SiO 2 hybrid con-taining 10 phr of nano-silica has the optimal composition. These PAE/nano-silica hybrid coatings have potential
Other than dynamic-mechanical analyses to predict final performance of tread compounds, direct measurements of friction, abrasion, and rolling resistance of tread compounds showed a 43% increase ...
The abrasion resistance of LHP cement concrete increased by 10.0% and 15.8% when the added silica fume content was 3% and 5%, respectively. The type of silica fume also has a certain influence on ...
Silica fume content – silica fume has a profound effect on the abrasion resistance of concrete, the abrasion resistance increase with respect to the increase of silica fume addition. For concrete with surface crack width of 1 mm and water flow impinging directly on the crack, the gains in abrasion rate were nearly 13% and 25%, …
