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Designation: C 5 – 79 (Reapproved 1997)

Standard Specification for

Quicklime for Structural Purposes1
This standard is issued under the fixed designation C 5; the number immediately following the designation indicates the year of original
adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A superscript
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.

1. Scope
1.1 This specification covers all classes of quicklime such as
crushed lime, granular lime, ground lime, lump lime, pebble
lime, and pulverized lime, used for structural purposes.

Calcium Lime
Calcium oxide, min, %
Magnesium oxide, min, %
Calcium and magnesium oxide,
min, %
Silica, alumina, and oxide of iron,
max, %
Carbon dioxide, max, %:
If sample is taken at place of
manufacture
If sample is taken at any other
place

2. Referenced Documents
2.1 ASTM Standards:
C 25 Test Methods for Chemical Analysis of Limestone,
Quicklime, and Hydrated Lime2
C 50 Practice for Sampling, Inspection, Packing, and Marking of Lime and Limestone Products2
C 51 Terminology Relating to Lime and Limestone (As
Used by the Industry)2
C 110 Test Methods for Physical Testing of Quicklime,
Hydrated Lime, and Limestone2
E 11 Specification for Wire-Cloth Sieves for Testing Purposes3

Magnesium Lime

75
95

20
95

5

5

3

3

10

10

5. Residue
5.1 The quicklime shall contain no more than 15 weight %
of residue.
6. General Requirements
6.1 Quicklime shall be slaked and aged in accordance with
the printed directions of the manufacturer. The resulting lime
putty shall be stored until cool.
6.2 Lime putty prepared in accordance with X1.4.2 and
adjusted to standard consistency in accordance with Test
Methods C 110, shall show no pops or pits when tested in
accordance with Test Methods C 110.
6.3 Lime putty prepared as above shall have a plasticity
figure of not less than 200.

3. Terminology
3.1 Definitions—Unless otherwise specified, for definitions
of terms used in this standard, refer to Terminology C 51.
4. Chemical Composition
4.1 The quicklime shall conform to the following requirements as to chemical composition, calculated on a nonvolatile
basis:

7. Sampling, Inspection, etc.
7.1 The sampling, inspection, rejection, retesting, packing,
and marking shall be conducted in accordance with Methods
C 50.
8. Test Methods
8.1 Conformance to c...
Designation:C5–79(Reapproved 1997)
Standard Specification for
Quicklime for Structural Purposes
1
This standard is issued under the fixed designation C 5; the number immediately following the designation indicates the year of original
adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A superscript
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.
1. Scope
1.1 This specification covers all classes of quicklime such as
crushed lime, granular lime, ground lime, lump lime, pebble
lime, and pulverized lime, used for structural purposes.
2. Referenced Documents
2.1 ASTM Standards:
C 25 Test Methods for Chemical Analysis of Limestone,
Quicklime, and Hydrated Lime
2
C 50 Practice for Sampling, Inspection, Packing, and Mark-
ing of Lime and Limestone Products
2
C 51 Terminology Relating to Lime and Limestone (As
Used by the Industry)
2
C 110 Test Methods for Physical Testing of Quicklime,
Hydrated Lime, and Limestone
2
E 11 Specification for Wire-Cloth Sieves for Testing Pur-
poses
3
3. Terminology
3.1 Definitions—Unless otherwise specified, for definitions
of terms used in this standard, refer to Terminology C 51.
4. Chemical Composition
4.1 The quicklime shall conform to the following require-
ments as to chemical composition, calculated on a nonvolatile
basis:
Calcium Lime Magnesium Lime
Calcium oxide, min, % 75
Magnesium oxide, min, % 20
Calcium and magnesium oxide,
min, %
95 95
Silica, alumina, and oxide of iron,
max, %
55
Carbon dioxide, max, %:
If sample is taken at place of
manufacture
33
If sample is taken at any other
place
10 10
5. Residue
5.1 The quicklime shall contain no more than 15 weight %
of residue.
6. General Requirements
6.1 Quicklime shall be slaked and aged in accordance with
the printed directions of the manufacturer. The resulting lime
putty shall be stored until cool.
6.2 Lime putty prepared in accordance with X1.4.2 and
adjusted to standard consistency in accordance with Test
Methods C 110, shall show no pops or pits when tested in
accordance with Test Methods C 110.
6.3 Lime putty prepared as above shall have a plasticity
figure of not less than 200.
7. Sampling, Inspection, etc.
7.1 The sampling, inspection, rejection, retesting, packing,
and marking shall be conducted in accordance with Methods
C 50.
8. Test Methods
8.1 Conformance to chemical requirements shall be deter-
mined in accordance with Test Methods C 25.
8.2 Conformance to plasticity and residue requirements
shall be determined in accordance with Test Methods C 110.
9. Keywords
9.1 building (structural); calcium oxide; dolomitic lime;
high calcium lime; lime putty; magnesium oxide; plasticity;
quicklime; residue; slaking
1
This specification is under the jurisdiction of ASTM Committee C-7 on Lime
and is the direct responsibility of Subcommittee C07.02 on Structural Lime.
Current edition approved Nov. 30, 1979. Published January 1980. Originally
published as C5–13T.Last previous edition C5–59(1974).
2
Annual Book of ASTM Standards, Vol 04.01.
3
Annual Book of ASTM Standards, Vol 14.02.
1
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