portlandite sentence in Hindi
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- Portlandite makes up about 25 % of concrete made with Portland cement without pozzolanic cementitious materials.
- It was named portlandite because the chemical calcium hydroxide is a common hydrolysis product of Portland cement.
- Indirect methods comprise on the one hand methods that investigate which material properties are responsible for the pozzolan s reactivity with portlandite.
- In this type of concrete, carbon dioxide is slowly absorbed to convert the Portlandite into insoluble calcium carbonate ( CaCO 3 ), in a process called carbonatation:
- Like Portlandite, calcium carbonate in mineral form can also be porous, permeable and with a poor resistance to acid attack, which causes it to release carbon dioxide.
- Minerals associated with brownmillerite in the Mayen locality include calcite, ettringite, wollastonite, larnite, mayenite, gehlenite, diopside, pyrrhotite, grossular, spinel, afwillite, jennite, portlandite and jasmundite.
- It occurs with calcite, ettringite, wollastonite, larnite, brownmillerite, gehlenite, diopside, pyrrhotite, grossular, spinel, afwillite, jennite, portlandite, jasmundite, melilite, kalsilite and corundum in the limestone xenoliths.
- In chemical terms, the pozzolanic reaction occurs between calcium hydroxide, also known as portlandite ( Ca ( OH ) 2 ), and silicic acid ( written as H 4 SiO 4 or as Si ( OH ) 4 ):
- Pozzolanic concretes, including EMCs, however, continue to consume the soft and porous Portlandite as the hydration process continues, turning it into additional hardened concrete as calcium silicate hydrate ( C-S-H ) rather than calcium carbonate.
- This is also the case of calcium hydroxide ( portlandite ) whose solubility at 70 �C is about half of its value at 25 �C . The dissolution of calcium hydroxide in water is also an exothermic process and obeys to the Le Chatelier's principle.
- This is why the reaction leads to the elimination of the excess of portlandite ( Ca ( OH ) 2 ) and brucite ( Mg ( OH ) 2 ), respectively, out of the silicate system, giving rise to the crystallization of both hydroxides as separate phases.
- Reaction 3 describes the hydration of olivine with water only to yield C-S-H ) phases formed along with portlandite ( Ca ( OH ) 2 ) in hardened Portland cement paste after the hydration of belite ( Ca 2 SiO 4 ), the artificial calcium equivalent of forsterite.
- Serpentine is stable at high pH in the presence of brucite like calcium silicate hydrate, ( C-S-H ) phases formed along with portlandite ( Ca ( OH ) 2 ) in hardened Portland cement paste after the hydration of belite ( Ca 2 SiO 4 ), the artificial calcium equivalent of forsterite.
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