calcium hydroxide

(redirected from Portlandite)
Also found in: Thesaurus, Medical, Encyclopedia.
Related to Portlandite: Portland cement, calcite, Ettringite

calcium hydroxide

n.
A soft white alkaline powder, Ca(OH)2, used in making mortar, cements, calcium salts, paints, hard rubber products, and petrochemicals. Also called slaked lime.

calcium hydroxide

n
(Elements & Compounds) a white crystalline slightly soluble alkali with many uses, esp in cement, water softening, and the neutralization of acid soils. Formula: Ca(OH)2. Also called: lime, slaked lime, hydrated lime, calcium hydrate, caustic lime or lime hydrate

cal′cium hydrox′ide


n.
a white powder, Ca(OH)2, used in mortar, plaster, and cement.
[1885–90]
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.calcium hydroxide - a caustic substance produced by heating limestonecalcium hydroxide - a caustic substance produced by heating limestone
hydrated oxide, hydroxide - a compound of an oxide with water
References in periodicals archive ?
During the early hydration period (< 1 week), there is a slightly higher portlandite amount of PFA-cement blended mixes if compared with pure PC, as the hydration of clinker is accelerated due to the filler effect thus produced more portlandite.
The hydrous transformation of free lime (CaO), anhydrite (CaSO4), secondary Ca(Mg)-silicate minerals and, especially in PF ashes, amorphous Al-Si glass phases control the solidification/cementation of ash, mainly by the formation of secondary Ca-rich hydrate phases and subsequently by the carbonation of portlandite [6].
The endothermic effect with a maximum at the temperature of 500 [degrees]C is associated with portlandite dehydroxylation.
Image analysis has been successfully used in previous studies7 9 to assess the amount of portlandite in mortar as well as the geometrical parameters of the particles (size, shape, etc.
5, it was estimated that the main minerals of the expanded-clay lightweight concrete produced from the mixture C are ettringite, dolomite, silica, calcite, portlandite, sunstone and cement minerals.
2]S were: Amorphous hydrated phase (29%), portlandite (Ca[(OH).
In addition to CaO hydration to form portlandite ([Ca(OH).
Gypsum and portlandite in FBA are tar more soluble and faster reacting than either LST or RPR, hence the greater reduction in acidity.
Walenta and Fullmann [17] have reported highly reproducible quantification of sulphate, calcite and portlandite phases in cementitious materials, but an individual adaption method is needed for ashes, slags, etc.
Benzet and Benhassine [12] showed that the crystallised quartz finely crushed can react under certain conditions with the portlandite, but the quantification of the chemical activity separately of the physico-chemical and micro-structural effect is difficult and uncertain.
FBA contains approximately 35% of total Ca in soluble gypsum and portlandite, and 65% as the less soluble calcite and ettringite (Wang et al.