ASTM C51-02
(Terminology)Standard Terminology Relating to Lime and Limestone (as used by the Industry)
Standard Terminology Relating to Lime and Limestone (as used by the Industry)
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Designation:C51–02
Standard Terminology Relating to
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Lime and Limestone (as used by the Industry)
This standard is issued under the fixed designation C 51; the number immediately following the designation indicates the year of original
adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.Asuperscript
epsilon (e) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the Department of Defense.
INTRODUCTION
Where appropriate, the various terms defined below should be prefixed with one or other of the
adjectives “high-calcium,” “magnesian,” or “dolomitic.” (Examples: dolomitic quicklime; high-
calcium hydraulic hydrated lime; magnesian or dolomitic limestone.)
The composition of a limestone should be given in terms of a percentage of the carbonates present.
In limestone of interest to the lime industry, it is usually assumed that the material consists almost
entirely of carbonates. Where this assumption is not valid, the percentage of noncarbonate material
should be determined, and the composition expressed in terms of the carbonate material present.
This terminology is as commonly used by the industry. For specific application of lime or a
limestone product, see the appropriate ASTM specification.
agricultural lime—either ground quicklime or hydrated lime for specific applications but generally do not meet one or
whose calcium and magnesium content is capable of neu- more specifications required of primary lime products.
tralizing soil acidity. Examples include lime kiln dust and lime hydrator rejects. It
agricultural limestone—ground or pulverized limestone isadvisedthatthespecificcompositions,physicalproperties,
whose calcium and magnesium content is capable of neu- performance characteristics, and anticipated variabilities of
tralizing soil acidity. such materials be evaluated for the service intended.
air-slaked lime—the product containing various proportions calcareous—originating from predominately calcium carbon-
of the oxides, hydroxides, and carbonates of calcium and ate or one of its derivative forms.
magnesium which results from the exposure of quicklime to calcia—the chemical compound calcium oxide (CaO).
the air in sufficient quantity to show physical signs of Cement-Lime Mortar—Cement-Lime Mortar primarily con-
hydration (difficult to determine visually in pulverized sists of hydraulic cement, hydrated lime or lime putty,
quicklime). mason’s sand and water.
alkaline earth solutions (AES)—an aqueous solution of the
DISCUSSION—These mortars can be specified by proportions or
oxide or hydroxide of an element of group IIa in the periodic
properties indicated in Specification C 270 (Standard Specification for
table, such as calcium or magnesium. These solutions may
Mortar for Unit Masonry).
be strongly alkaline. See pH.
chemical lime—a quicklime or hydrated lime whose chemical
available lime index—thoseconstituentsofalimewhichenter
and physical characteristics and method of processing make
into a desired reaction under the conditions of a specific
it suitable for one or more of the many and varied chemical
method or process.
and industrial uses of the product.
building or construction lime—a lime whose chemical and
physical characteristics and method of processing make it
DISCUSSION—The chemical forms of calcium oxide (CaO), calcium
hydroxide (Ca(OH) ), magnesium oxide (MgO), or magnesium hy-
suitable for the ordinary or special construction uses of the
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droxide (Mg(OH) ) alone or in combination may be produced either
product. 2
primarily or as a by-product of materials other than limestone, for
by-product lime—by-product limes include a variety of Cal-
example, Ca(OH) formed by acetylene generation from calcium
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cium and/or Calcium/Magnesium compounds that are usable
carbide (CaC ), water treatment sludges, etc.
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dead burned dolomite—dolomitic limestone that has been
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This terminology is under the jurisdiction of ASTM Committee C07 on Lime
heated with or without additives to a temperature sufficiently
and is the direct responsibility of Subcommittee C07.08 on Editorial and Nomen-
high and for a long enough time to decompose the carbonate
clature.
Current edition approved June 10, 2002. Published July 2002. Originally
published as C 51 – 22. Last previous edition C 51 – 01.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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C51
structure so as to form calcium oxide and periclase in a or dolomitic.
matrix that provides resistance to subsequent hydration and (1) dolomitic limestone—limestone containing from 35 to
recombination with carbon dioxide. 46 % magnesium carbonate (MgCO ).
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dolo
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