portlandite meaning in Hindi

Examples

1. Portlandite makes up about 25 % of concrete made with Portland cement without pozzolanic cementitious materials.
2. It was named portlandite because the chemical calcium hydroxide is a common hydrolysis product of Portland cement.
3. Indirect methods comprise on the one hand methods that investigate which material properties are responsible for the pozzolan s reactivity with portlandite.
4. 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:
5. 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.
6. Minerals associated with brownmillerite in the Mayen locality include calcite, ettringite, wollastonite, larnite, mayenite, gehlenite, diopside, pyrrhotite, grossular, spinel, afwillite, jennite, portlandite and jasmundite.
7. 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.
8. 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 ):
9. 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.
10. 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.