Portlandite is a hydroxide-bearing mineral typically included in the oxide mineral class. It is the naturally occurring form of calcium hydroxide (Ca(OH)2) and the calcium analogue of brucite (Mg(OH)2).
^"Portlandite: Mineral information, data and localities". www.mindat.org.
^"Portlandite Mineral Data". www.webmineral.com.
^Pallache, Charles; Berman, Harry; Frondel, Clifford (1944). The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana (7 ed.). Wiley. pp. 641–642. ISBN 9780471192398.
Portlandite is a hydroxide-bearing mineral typically included in the oxide mineral class. It is the naturally occurring form of calcium hydroxide (Ca(OH)2)...
reaction: Ca(OH)2 → Ca2+ + 2 OH− At ambient temperature, calcium hydroxide (portlandite) dissolves in water to produce an alkaline solution with a pH of about...
also, 2 OH− → O2− + H2O For portlandite this gives thus the following mass balance: Ca(OH)2 → CaO + H2O Thus portlandite can be written as CaO · H2O or...
chemical environment provided by the alkali reserve (KOH, NaOH) and the portlandite (calcium hydroxide) contained in the hardened cement paste causes a passivating...
the Na2Oeq content of cement) also contributes to the carbonation of portlandite by atmospheric CO2 in concrete although the rate of propagation of the...
and portlandite (Ca(OH)2) according to the reaction: 2 Ca 2 SiO 4 ⏟ Belite + 4 H 2 O ⏟ Water ⟶ 3 CaO ⋅ 2 SiO 2 ⋅ 3 H 2 O + Ca ( OH ) 2 ⏟ Portlandite {\displaystyle...
reaction stands a simple acid-base reaction between calcium hydroxide (as Portlandite) and silicic acid. Ancient Roman use as underwater cement Caesarea Maritima...
alkali–aggregate reaction (AAR) is also known as alkali–carbonate reaction. Portlandite – calcium hydroxyde: Ca(OH) 2 Patnaik, Pradyot (2003). Handbook of inorganic...
of Portland cement and takes part in the pozzolanic reaction with the portlandite formed in the hydration of the main cement minerals (e.g. alite). Metakaolin...
pyrometamorphic, and is unstable in moist air, quickly turning into portlandite (Ca(OH)2). Haynes, William M., ed. (2011). CRC Handbook of Chemistry...
cement its strength. Carbon dioxide is slowly absorbed to convert the portlandite (Ca(OH)2) into insoluble calcium carbonate. After the initial setting...
concrete from its external surface, they react with calcium hydroxide (portlandite, Ca(OH)2) and the pH of the concrete pore water progressively decreases...
causing the formation of cracks. Ultimately, Ca2+ ions in equilibrium with portlandite (Ca(OH)2) and C-S-H and dissolved in the concrete interstitial water...
sodium- or calcium-alumino-silicate CaO (calcium oxide) 6–10 % See also portlandite TiO2 (titanium dioxide) 4–5 % Impurity present in bauxite Na2O (bound...
with temperature. Another calcium compound, calcium hydroxide (Ca(OH)2, portlandite) also exhibits a retrograde solubility for the same thermodynamic reason:...
larnite in the Hatrurim Formation of Israel. It occurs associated with portlandite, afwillite and hydrocalumite at Scawt Hill, Ireland and with afwillite...
as a deicing agent. Calcium chloride reacts with calcium hydroxide (portlandite) present in cement hydration products and forms a deleterious expanding...
Founded 1765 (1765) Dissolved 1784 (1784) Preceded by Pittites Merged into Portlandites Headquarters Northamptonshire Ideology Conservatism Parliamentarism Political position...
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...
Structure of Mg(OH)2 List of minerals List of minerals named after people Portlandite, Ca(OH)2 Cookeite, LiAl4(Si3Al)O10(OH)8 Warr, L.N. (2021). "IMA–CNMNC...
21 March 2011. Kruszewski, Ł. (January 2006). "Oldhamite-periclase-portlandite-fluorite assemblage and coexisting minerals of burnt dump in Siemianowice...
cement to create "slag cement". Granulated blast furnace slags react with portlandite (Ca(OH)2), which is formed during cement hydration, via the pozzolanic...
pozzolanic reaction occurs between calcium hydroxide, also known as portlandite (Ca(OH)2), and silicic acid (written as H4SiO4, or Si(OH)4, in the geochemical...
temperature increases (ΔH < 0). This is also the case for calcium hydroxide (portlandite), whose solubility at 70 °C is about half of its value at 25 °C. The...
is shared with few inorganic compounds, such as calcium hydroxide (portlandite, an important mineral phase of hydrated cement paste), the calcium sulfates...
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