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Information Portal (U.S. National Library of Medicine) - CALCIUM
FORMATE
http://www.fhwa.dot.gov/ Calcium formate is another type of nonchloride accelerator used to accelerate
the setting time of concrete. At equal concentration, calcium formate (Ca[OOOCH]
2) is less effective in accelerating the hydration of C3S
than calcium chloride and a higher dosage is required to impart the same level
of acceleration as that imparted by CaCl2 (Ramachandran 1984). An
evaluation study of calcium formate as an accelerating admixture conducted by
Gebler (1983) indicated that the composition of cement, in particular gypsum
(SO3) content, had a major influence on the compressive strength
development of concretes containing calcium formate. Results showed that the
ratio of C3A to SO3 should be greater than 4 for calcium
formate to be an effective accelerating admixture; and that the optimum amount
of calcium formate to accelerate the concrete compressive strength appeared to
be 2-3% by weight of cement (Gebler 1983). Calcium nitrate and calcium
thiosulfate are also considered accelerators.
Local: Calcium salt of formic acid. It is used in leather
tanning, producing formic acid, concrete
cure accelerator. It is used as a food additive and
animal feed
as a preservative (food additive
E238). But its use is banned in some countries. It was used as a as a diuretic.
DESCRIPTION OF FORMIC ACID:
Formic acid,
also called methanoic acid), is the simplest and has the lowest mole weight of
the carboxylic acids, in which a single hydrogen atom is attached to the
carboxyl group (HCOOH). If a methyl group is attached to the carboxyl group, the
compound is acetic acid. It occurs naturally in the body of ants and in the
stingers of bees. Functionally, it is not only an acid but also an aldehyde; it
reacts with alcohols to form esters as an acid and it is easily oxidized which
imparts some of the character of an aldehyde. Pure formic acid is a colorless,
toxic, corrosive and fuming liquid, freezing at 8.4 C and boiling at 100.7 C. It
is soluble in water, ether, and alcohol. It irritates the mucous membranes and
blisters the skin. It is prepared commercially from sodium formate with the
reaction of condensed sulfuric acid. Formic acid is used as a chemical
intermediate and solvent, in processing textiles, leathers, electroplating, in
coagulating latex rubber, and as a disinfectant. |