ASTM C70-94(2001)
(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.
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An American National Standard
Designation:C70–94 (Reapproved 2001) American Association State
Highway and Transportation Officials Standard
AASHTO No.: T142
Standard Test Method for
Surface Moisture in Fine Aggregate
ThisstandardisissuedunderthefixeddesignationC 70;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginal
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.
1. Scope 4.2 Flask—Asuitable container or flask, preferably of glass
or noncorrosive metal. The container may be a pycnometer, a
1.1 This test method covers field determination of the
volumetricflask,agraduatedvolumetricflask,orothersuitable
amount of surface moisture in fine aggregate by displacement
measuring device. The volume of the container shall be from
in water.
two to three times the loose volume of the sample. The
1.2 This standard does not purport to address all of the
container shall be so designed that it can be filled to the mark,
safety concerns, if any, associated with its use. It is the
or the volume of its contents read, within 0.5 mL or less.
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica-
5. Sample
bility of regulatory limitations prior to use.
5.1 Selectarepresentativesampleofthefineaggregatetobe
2. Referenced Documents tested for surface moisture content. It shall weigh not less than
200 g. Larger samples will yield more accurate results.
2.1 ASTM Standards:
C 128 Test Method for Specific Gravity and Absorption of
6. Procedure
Fine Aggregate
6.1 The surface water content may be determined either by
C 566 TestMethodforTotalMoistureContentofAggregate
2 weight or volume. In each case the test shall be made at a
by Drying
temperature range of 65 to 85°F (18 to 29°C).
C 670 Practice for Preparing Precision and Bias Statements
2 6.2 Determination by Weight—Determine the weight of the
for Test Methods for Construction Materials
container, in grams, filled to the mark with only water. Before
3. Significance and Use placing the sample into the container, adjust the level of the
water so that it will be sufficient to cover the sample without
3.1 This test method is not widely used. However, it is a
going over the original mark. Introduce the weighed sample of
convenient procedure for field or plant determination of
fine aggregate into the container and remove the entrained air.
moisture content of fine aggregate if specific gravity values are
Fill the container to the original mark, and determine the
known and if drying facilities are not available. It can be used
weight in grams. Calculate the amount of water displaced by
to adjust aggregate weights for moisture content and to
the sample, as follows:
determine surface moisture contribution to mixing water in
portland cement concrete. W 5 W 1 W 2 W (1)
d c s
3.2 The accuracy of the test method depends upon accurate
where:
information on the bulk specific gravity of the material in a
W = weight of water displaced by the sample, g,
d
saturated surface-dry condition.
W = weight of container filled to the mark with water, g,
c
W = weight of sample, g, and
4. Apparatus s
W = weight of container and sample, filled to the mark
4.1 Balance,havingacapacityof2kgormoreandsensitive
with water, g.
to 0.5 g or less.
6.3 Determination by Volume—Measure a volume of water,
in millilitres, sufficient to cover the sample and place in the
container. Introduce the weighed sample of fine aggregate into
the container and remove the entrained air. Determine the
This test method is under the jurisdiction of ASTM Committee C09 on
Concrete and ConcreteAggregates and is the direct responsibility of Subcommittee
combinedvolumeofthesampleandthewaterbydirectreading
C09.20 on Normal Weight Aggregates.
when a graduated flask is used. When a pycnometer or
Current edition approved Sept. 15, 1994. Published November 1994. Originally
volumetric flask of known volume is used, fill the container to
published as C 70 – 27 T. Last previous edition C 70 – 79 (1992).
Annual Book of ASTM Standards, Vol 04.02. the known volume mark with an additional measured volume
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C70–94 (2001)
of water. The flask or pycnometer volume is then equal to the 8. Report
combined volume of sample and water. Calculate the amount
8.1 Report surface moisture test results as determined by
of water displaced by the sample, as follows:
this method to the nearest 0.1 %.
V 5 V 2 V (2)
s 2 1
9. Precision and Bias
where:
...
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