ASTM C642-06
(Test Method)Standard Test Method for Density, Absorption, and Voids in Hardened Concrete
Standard Test Method for Density, Absorption, and Voids in Hardened Concrete
SIGNIFICANCE AND USE
This test method is useful in developing the data required for conversions between mass and volume for concrete. It can be used to determine conformance with specifications for concrete and to show differences from place to place within a mass of concrete.
SCOPE
1.1 This test method covers the determinations of specific gravity, percent absorption, and percent voids in hardened concrete.
1.2 The text of this method references notes and footnotes which provide explanatory information. These notes and footnotes (excluding those in tables and figures) shall not be considered as requirements of this standard.
General Information
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Standards Content (Sample)
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Designation: C642 − 06
StandardTest Method for
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Density, Absorption, and Voids in Hardened Concrete
This standard is issued under the fixed designation C642; 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 (´) indicates an editorial change since the last revision or reapproval.
1. Scope* allow it to cool in dry air (preferably in a desiccator) to a
temperature of 20 to 25 °C and determine the mass. If the
1.1 This test method covers the determinations of denisty,
specimen was comparatively dry when its mass was first
percent absorption, and percent voids in hardened concrete.
determined, and the second mass closely agrees with the first,
1.2 The text of this test method references notes and
consideritdry.Ifthespecimenwaswetwhenitsmasswasfirst
footnotes which provide explanatory information. These notes
determined, place it in the oven for a second drying treatment
and footnotes (excluding those in tables and figures) shall not
of 24 h and again determine the mass. If the third value checks
be considered as requirements of this standard.
the second, consider the specimen dry. In case of any doubt,
1.3 The values stated in SI units are to be regarded as the redry the specimen for 24-h periods until check values of mass
are obtained. If the difference between values obtained from
standard.
two successive values of mass exceeds 0.5 % of the lesser
2. Significance and Use
value, return the specimens to the oven for an additional 24-h
drying period, and repeat the procedure until the difference
2.1 This test method is useful in developing the data
between any two successive values is less than 0.5 % of the
required for conversions between mass and volume for con-
lowest value obtained. Designate this last value A.
crete. It can be used to determine conformance with specifica-
tions for concrete and to show differences from place to place
5.2 Saturated Mass After Immersion—Immerse the
within a mass of concrete.
specimen, after final drying, cooling, and determination of
mass, in water at approximately 21 °C for not less than 48 h
3. Apparatus
and until two successive values of mass of the surface-dried
3.1 Balance, sensitive to 0.025 % of the mass of the
sample at intervals of 24 h show an increase in mass of less
specimen.
than 0.5 % of the larger value. Surface-dry the specimen by
removing surface moisture with a towel, and determine the
3.2 Container, suitable for immersing the specimen and
mass. Designate the final surface-dry mass after immersion B.
suitable wire for suspending the specimen in water.
5.3 Saturated Mass After Boiling—Place the specimen,
4. Test Specimen
processed as described in 5.2, in a suitable receptacle, covered
4.1 Whenever possible, the sample shall consist of several with tap water, and boil for 5 h.Allow it to cool by natural loss
of heat for not less than 14 h to a final temperature of 20 to 25
individual portions of concrete, each to be tested separately.
The individual portions may be pieces of cylinders, cores, or °C. Remove the surface moisture with a towel and determine
the mass of the specimen. Designate the soaked, boiled,
beams of any desired shape or size, except that the volume of
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each portion shall be not less than 350 cm (or for normal surface-dried mass C.
weight concrete, approximately 800 g); and each portion shall
5.4 Immersed Apparent Mass—Suspend the specimen, after
be free from observable cracks, fissures, or shattered edges.
immersion and boiling, by a wire and determine the apparent
mass in water. Designate this apparent mass D.
5. Procedure
6. Calculation
5.1 Oven-Dry Mass—Determine the mass of the portions,
and dry in an oven at a temperature of 100 to 110 °C for not
6.1 By using the values for mass determined in accordance
less than 24 h. After removing each specimen from the oven,
withtheproceduresdescribedinSection5,makethefollowing
calculations:
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This test method is under the jurisdiction of ASTM Committee C09 on
Absorption after immersion, % 5 @~B 2 A!/A# 3100 (1)
Concrete and Concrete Aggregatesand is the direct responsibility of Subcommittee
Absorption after immersion and boiling, % 5 @~C 2 A!/A# 3100(2)
C09.66 on Concrete’s Resistance to Fluid Penetration.
Current edition approved July 1, 2006. Published August 2006. Originally
Bulk density, dry 5 A/ C 2 D ·ρ 5 g (3)
@ ~ !#
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approved in 1969. Last previous edition approved in 1997 as C642 – 97. DOI:
10.1520/C0642-06. Bulk density after immersion 5 B/ C 2 D ·ρ (4)
@ ~ !#
*A Summary of Changes section appears at the end of this standard
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