Silicon carbide is one of the hardest ceramic materials, often used alone or combined with metal composites for use. Its main properties are strength, chemical stability, rigidity, and high temperature resistance.
This study investigated the effects of adding tungsten and silicon carbides (WC and SiC) at individual concentrations of 1%, 2%, 3% and 4% to recycled concrete to enhance its flexural fatigue performance. Field emission scanning electron microscopy images were also analyzed as part of this investigation.
Styrka
Silicon carbide (SiC) is an engineered synthetic material characterized by its superior mechanical strength and chemical inertness, making it an excellent material choice for cutting equipment and crushing machinery. SiC also improves mechanical properties of concrete by aiding its hydration processes and shrinking less than conventional concrete construction projects – an attractive feature when exposed to harsh environments. It’s an excellent material choice when durability is key in construction projects requiring long-term service life, like cutting equipment manufacturing or crushing machinery production.
Silicon carbide concrete’s particle size and shape help it to have lower permeability than conventional concrete; however, its overall permeability remains higher than other forms of concrete, which enables it to resist chloride attacks in marine environments, leading to improved corrosion resistance and decreased maintenance costs.
Carbide concrete is formed by adding either tungsten carbide or silicon carbide waste products from hard alloy metal production into traditional Portland cement mixture. Their effects on permeability, compressive strength and corrosion properties of the concrete have been investigated in depth.
Results indicate that composites containing WC and SiC significantly enhance concrete’s compressive strength by 17%. Their flexural strength also outpaces that of regular concrete, making these composites suitable for use as flooring materials in logistics workshops or distribution warehouses where heavy loads may often be exerted upon floors.
Toughness
Silicon carbide is an extremely hard, durable material with excellent impact and corrosion resistance, making it suitable for various uses such as armoring and refractory concrete applications. Silicon carbide also boasts several advantages over traditional concrete construction materials, including increased flexural strength and better surface abrasion resistance; additionally it boasts lower thermal expansion coefficient and greater heat conductivity.
Recently, researchers examined the effects of silicon carbide on flexural strength and rapid chloride permeability of concrete. Test results indicate that adding silicon carbide improved both factors while decreasing permeability of concrete; additionally WC and hybrid silicon carbides significantly extended its flexural durability.
ANOVA analysis demonstrated that the flexural strength of concrete made with increasing carbide percentage increased dramatically; its peak value being reached with 4% of WC and SiC combined. Flexural toughness of such concrete proved superior to that of conventional concrete due to its abrasive nature and higher density.
Silicon carbide can not only increase the mechanical properties of concrete, but it can also improve its hydration behavior. In this study, disintegrated and milled silicon caride (SiCA) were added to refractory concrete with cenospheres to test how these additions affected its hydration process. They found that adding disintegrated SiCA together with CNPs prolonged AC paste hydration by 1.25 hours when compared with milled SiCA used alone on AC paste hydration time.
Hållbarhet
Silicon carbide additives to concrete can significantly enhance its durability. Furthermore, silicon carbide increases flexural strength – an integral factor of pavement design – making the pavement less likely to cracks and other durability problems. Silicon carbide may also serve as an alternative additive that increases both its tensile and flexural strengths – similar to fibers or chemical admixtures.
This study investigated the effect of tungsten and silicon carbides on recycled aggregate concrete (RC) and silicon carbide recycled concrete (SiCRC), specifically their mechanical properties. To assess this, researchers measured flexural fatigue performance, chloride permeability, initial cracking load as well as initial cracking load for both materials. Results demonstrated an increase in both individual and hybrid carbides’ impact on strength while up to 4% increase was noted in fatigue life of both.
Densities of both RC and SiCRC increased slightly with the addition of carbides; this effect was most prominent with WC. Particle packing led to higher densities for hybrid mixes than either of RC or SiCRC concrete samples; their rapid chloride permeability tests demonstrated that WC had the greatest resistance against chloride permeation than SiC. Permeability levels for the hybrid composite were much lower than in either of RC or plain concrete concrete mixes.
Porosity
Porosity of silicon carbide concrete is an integral element of its ability to withstand tension stress, as it reduces its water content, weight, and cost. Therefore, this makes it an excellent material for construction projects, where its lightweight composition makes it suitable for mixing with cement to form more durable and flexible composite materials; perfect for slip-resistant flooring applications; it can easily be troweled after one or more dry shakes for smooth application.
Figure 4 depicts that adding individual or hybrid carides increases silicon carbide concrete’s compressive strength by up to 4%, as evidenced in Figure. This may be attributable to improved particle packing which contributes to interphase development; Jeon et al. verified this result.
Silicon carbide concrete stands out from conventional concrete by having higher porosity due to smaller particles that fill in voids more effectively and also improve durability when it comes to bending fatigue resistance.
To produce the porous honeycomb structure of this invention, an organometallic compound containing silicon carbide particles and metallic silicon is combined with a raw-material mixture consisting of silicon carbide particles and metallic silicon in order to form porous materials with tap densities of no greater than 0.6 g/cc, more preferably 0.5 g/cc or lower. This combination is then decomposed and converted in firing into pore formers. Adding these raw-material mixtures requires adding 5-30 parts by mass of organometallic compounds before decomposing and producing porous materials suitable for producing porous honeycomb structures.
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