What is meant by Metakaolin?
What is meant by Metakaolin?
Metakaolin is a dehydroxylated form of the clay mineral kaolinite. Metakaolin is commonly used in the production of ceramics, but is also used as cement replacement in concrete. Metakaolin has a smaller particle size (∼1–2 μm) and higher surface area compared with portland cement, but a larger particle size than SF.
What are the properties of metakaolin?
1.1. Properties of metakaolin
| Property | Value |
|---|---|
| Specific gravity | 2.60 |
| Bulk density (g/cm3) | 0.3 to 0.4 |
| Physical form | Powder |
| Color | Off-White |
Why is Metakaolin used in concrete?
Metakaolin in concrete tend to reduce the size of pores which consequently lead to obtain more strength, higher density, and more resistance to acid. Furthermore, metakaolin improves concrete resistance to alkali silicate reactions and sulfate attack.
Where is Metakaolin found?
Metakaolin can be produced from a variety of primary and secondary sources containing kaolinite: High purity kaolin deposits. Kaolinite deposits or tropical soils of lower purity. Paper sludge waste (if containing kaolinite)
What is the use of Alccofine?
The alccofine-1203 is to be used as a partial substitute to the cement (OPC). The research also includes perusal the behavior of alccofine-1203 used in concrete mix of rigid pavement. It also analyzes the results of workability, compressive strength, and flexural-strength.
What is rice husk ash concrete?
Agricultural waste, such as rice husk ash (RHA), can be used instead of cement in concrete making, producing efficient concrete with improved concrete properties like impermeability, workability, strength, and corrosion of steel reinforcement.
What is the fly ash concrete?
Fly ash is used to lower the cost and to improve the performance of PCC. Typically, 15 percent to 30 percent of the portland cement is replaced with fly ash, with even higher percentages used for mass concrete placements. An equivalent or greater weight of fly ash is substituted for the cement removed.
What is mullite used for?
Mullite is present in the form of needles in porcelain. It is produced during various melting and firing processes, and is used as a refractory material, because of its high melting point of 1840 °C.
What is boiler residue?
Boiler residue (BR) of thermal power plants is one of the important secondary sources for vanadium production. In this research, the aluminothermic self-propagating high-temperature synthesis (SHS) was used for recovering the transition metals of BR for the first time.
What is fly ash Class 10?
It is the ash that is produced by the burning of powered coal and other materials which is then carried by air, polluting the environment.
How Alccofine is produced?
Alccofine is an ultrafine ground granulated blast furnace slag based supplementary cementitious material obtained from Ambuja Cements Ltd, manufacturer of various cements in India. ACI 363[1] considered the concrete having 28days compressive strength of more than 41 MPa as high- strength concrete.
How is Alccofine obtained?
The Alccofine is manufactured by Ambuja Cements Ltd was used in this experiment as a mineral admixture. The products alccofine 1203 is a supplementary cementitious material suitably replaces silica fume used in high performance concrete. It is obtained from the materials of the iron ore industry.
What is sugarcane bagasse ash?
Sugar cane bagasse ash (SCBA) is an abundant byproduct of the sugar and ethanol industry. SCBA is generally used as a fertilizer or is disposed of in landfills, which has led to intensified environmental concerns.
How do you control free lime clinker?
By adjusting the amount of fluorite or fluorine-containing waste used as a mineralizer that is a fluorine source in the clinker, and the amount of fuel used as the SO 3 source in the clinker or the amount of waste gypsum added, The method for controlling the amount of free lime in a cement clinker according to claim 1.
How do you form mullite?
Mullite or porcelainite is a rare silicate mineral formed during contact metamorphism of clay minerals. It can form two stoichiometric forms: 3Al2O32SiO2 or 2Al2O3 SiO2….
| Mullite | |
|---|---|
| Formula (repeating unit) | Al6Si2O13 |
| IMA symbol | Mul |
| Strunz classification | 9.AF.20 |
| Crystal system | Orthorhombic |
What is the composition of mullite?
Mullite belongs to the compositional series of orthorhombic aluminosilicates with the general composition Al2(Al2+2xSi2-2x)O10-x. Main members are sillimanite (x = 0), stoichiometric 3/2-mullite (x = 0.25), 2/1-mullite (x = 0.40), and the SiO2-free phase ι-alumina (x = 1, crystal structure not known).
What is clinker in boiler?
Clinkers, also known as slag, and in coal fired boilers consist of the noncombustible elements and minerals found in coal that melt and fuse together as lumpy ashes from coal combustion. Clinkers resemble volcanic ash and lava. They occur in the high-temperature furnace area of the boiler.
What is clinker ash?
Clinker ash, formed from ash melted red hot in a high-temperature boiler, dropped to the bottom of the water tank, and immediately cooled and crushed with a crusher, is a sand state with an adjusted particle size. The main components of clinker ash are “silica” and “alumina”, the same components as fly ash.
What color is fly ash?
Fly ash can be tan to dark gray, depending on its chemical and mineral constituents. Tan and light colors are typically associated with high lime content. A brownish color is typically associated with the iron content. A dark gray to black color is typically attributed to an elevated unburned carbon content.
What is the anatomy of a metaphor?
The Anatomy of a Metaphor. Metaphors can be broken down into two elements: a tenor and a vehicle. The tenor is the thing a metaphor describes. The vehicle is the thing to which the tenor is compared. For instance, in the metaphor ” Love is a battlefield ,” love is the tenor because it’s the thing being described,…
What is the etymology of the word metaphor?
The Dictionary Definition of Metaphor: A basic definition and etymology of the term—it comes from the Greek metaphora, meaning “a transfer.” 99 Metaphors for Love: ThoughtCo’s compendium of 99 love metaphors that span genres and centuries.
What is the difference between a metaphor and a simile?
Here’s a tip: Similes are like metaphors, but metaphors aren’t similes. A metaphor makes a comparison by stating that one thing is something else, but a simile states that one thing is like something else.
What is the importance of metaphors in literature?
By connecting different spheres of experience and language, they can lead the reader to surprising and important discoveries; the figurative meaning that metaphors create can help a reader to see the world or a concept in a new way. They can even sometimes hide a person’s lack of knowledge about the things they’re discussing.