ASTM C70-94
(Test Method)Standard Test Method for Surface Moisture in Fine Aggregate
Standard Test Method for Surface Moisture in Fine Aggregate
SCOPE
1.1 This test method covers field determination of the amount of surface moisture in fine aggregate by displacement in water.
1.2 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
General Information
Relations
Standards Content (Sample)
NOTICE: This standard has either been superseded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
Designation: C 70 – 94 An American National Standard
American Association State
Highway and Transportation Officials Standard
AASHTO No.: T142
Standard Test Method for
Surface Moisture in Fine Aggregate
This standard is issued under the fixed designation C 70; 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 measuring device. The volume of the container shall be from
two to three times the loose volume of the sample. The
1.1 This test method covers field determination of the
container shall be so designed that it can be filled to the mark,
amount of surface moisture in fine aggregate by displacement
or the volume of its contents read, within 0.5 mL or less.
in water.
1.2 This standard does not purport to address all of the
5. Sample
safety concerns, if any, associated with its use. It is the
5.1 Select a representative sample of the fine aggregate to be
responsibility of the user of this standard to establish appro-
tested for surface moisture content. It shall weigh not less than
priate safety and health practices and determine the applica-
200 g. Larger samples will yield more accurate results.
bility of regulatory limitations prior to use.
6. Procedure
2. Referenced Documents
6.1 The surface water content may be determined either by
2.1 ASTM Standards:
weight or volume. In each case the test shall be made at a
C 128 Test Method for Specific Gravity and Absorption of
2 temperature range of 65 to 85°F (18 to 29°C).
Fine Aggregate
6.2 Determination by Weight—Determine the weight of the
C 566 Test Method for Total Moisture Content of Aggregate
2 container, in grams, filled to the mark with only water. Before
by Drying
placing the sample into the container, adjust the level of the
C 670 Practice for Preparing Precision and Bias Statements
2 water so that it will be sufficient to cover the sample without
for Test Methods for Construction Materials
going over the original mark. Introduce the weighed sample of
3. Significance and Use fine aggregate into the container and remove the entrained air.
Fill the container to the original mark, and determine the
3.1 This test method is not widely used. However, it is a
weight in grams. Calculate the amount of water displaced by
convenient procedure for field or plant determination of
the sample, as follows:
moisture content of fine aggregate if specific gravity values are
known and if drying facilities are not available. It can be used V 5 W 1 W 2 W (1)
s c s
to adjust aggregate weights for moisture content and to
where:
determine surface moisture contribution to mixing water in
V 5 weight of water displaced by the sample, g,
s
portland cement concrete.
W 5 weight of container filled to the mark with water, g,
c
3.2 The accuracy of the test method depends upon accurate
W 5 weight of sample, g, and
s
information on the bulk specific gravity of the material in a
W 5 weight of container and sample, filled to the mark
saturated surface-dry condition.
with water, g.
6.3 Determination by Volume—Measure a volume of water,
4. Apparatus
in millilitres, sufficient to cover the sample and place in the
4.1 Balance, having a capacity of 2 kg or more and sensitive
container. Introduce the weighed sample of fine aggregate into
to 0.5 g or less.
the container and remove the entrained air. Determine the
4.2 Flask—A suitable container or flask, preferably of glass
combined volume of the sample and the water by direct reading
or noncorrosive metal. The container may be a pycnometer, a
when a graduated flask is used. When a pycnometer or
volumetric flask, a graduated volumetric flask, or other suitable
volumetric flask of known volume is used, fill the container to
the known volume mark with an additional measured volume
This test method is under the jurisdiction of ASTM Committee C-9 on Concrete of water. The flask or pycnometer volume is then equal to the
and Concrete Aggregatesand is the direct responsibility of Subcommittee C09.20on
combined volume of sample and water. Calculate the amount
Normal Weight Aggregates.
of water displaced by the sample, as follows:
Current edition approved Sept. 15, 1994. Published November 1994. Originally
published as C 70 – 27 T. Last previous edition C 70 – 79 (1992).
V 5 V 2 V (2)
s 2 1
Annual Book of ASTM Standards, Vol 04.02.
Copyright © ASTM, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959, United States.
C70
this method to the nearest 0.1 %.
where:
V 5 volume of water displaced by the sample, mL,
s
9. Precision and Bias
V 5 combined volume of sa
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.