ASTM C495-99a
(Test Method)Standard Test Method for Compressive Strength of Lightweight Insulating Concrete
Standard Test Method for Compressive Strength of Lightweight Insulating Concrete
SCOPE
1.1 This test method covers the preparation of specimens and the determination of the compressive strength of lightweight insulating concrete having an oven-dry weight not exceeding 50 lb/ft (800 kg/m ) as determined by the procedures described herein. This test method covers the preparation and testing of molded 3 by 6-in. (75 by 150-mm) cylinders.
1.2 The values stated in inch-pound units are to be regarded as the standard.
1.3 This standard does not purport to address all of the safety problems, 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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Designation:C495–99a
Standard Test Method for
Compressive Strength of Lightweight Insulating Concrete
This standard is issued under the fixed designation C 495; 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 4. Apparatus
1.1 This test method covers the preparation of specimens 4.1 Testing Machine—Use a testing machine as prescribed
and the determination of the compressive strength of light- in Test Method C 39.
weight insulating concrete having an oven-dry weight not 4.2 Scales and Weights—Use scales and weights in weigh-
3 3
exceeding 50 lb/ft (800 kg/m ) as determined by the proce- ing specimens that conform to those specified in theApparatus
dures described herein.This test method covers the preparation Section of Test Method C 109.
and testing of molded 3 by 6-in. (75 by 150-mm) cylinders. 4.3 Drying Oven—Use an oven as specified in Test Method
1.2 The values stated in inch-pound units are to be regarded C 88.
as the standard. 4.4 Molds—Use molds made of nonabsorbent materials or
1.3 This standard does not purport to address all of the of materials treated to reduce absorption, that are watertight,
safety problems, if any, associated with its use. It is the and not subject to distortion of more than ⁄16 in. (1.6 mm) in
responsibility of the user of this standard to establish appro- any dimension during molding and early curing of specimens.
priate safety and health practices and determine the applica- Coat all mold surfaces that will be in contact with concrete
bility of regulatory limitations prior to use. except single use plastic molds with wax or mineral oil, prior
to use. Use molds having a diameter of 3 6 ⁄16 in. (75 6 1.6
2. Referenced Documents 1
mm) and a length of 6 6 ⁄8 in. (1506 3 mm).
2.1 ASTM Standards:
5. Sampling
C 39 Test Method for Compressive Strength of Cylindrical
Concrete Specimens 5.1 Sample fresh lightweight insulating concrete in accor-
C 88 Test Method for Soundness of Aggregates by Use of dance with applicable provisions of Practice C 172, with the
Sodium Sulfate or Magnesium Sulfate following exceptions:
C 109/C 109M Test Method for Compressive Strength of 5.1.1 Sampling from Pump Equipment—Fill a bucket of
Hydraulic Cement Mortars (Using 2-in. or 50-mm Cube approximately 10-qt (9-dm ) capacity by passing through the
Specimens) dischargestreamoftheconcretepumphosebeingusedtoplace
C 172 Practice for Sampling Freshly Mixed Concrete theconcrete,atthepointofplacementoftheconcrete.Exercise
C 617 Practice for Capping Cylindrical Concrete Speci- care to ensure that the sample is representative of the pour,
mens avoiding the beginning or ending of the discharge from the
C 670 Practice for Preparing Precision and Bias Statements equipment. Prepare the test specimens as described in Section
for Test Methods for Construction Materials 6, by filling them with a scoop of lightweight insulating
concrete dipped from the bucket.
3. Significance and Use
5.1.2 Remixing Sample—Do not remix the sample.
3.1 This test method provides standardized requirements for
6. Test Specimens
sampling, molding, curing, and testing lightweight insulating
concretes for the purpose of determining compliance with 6.1 Size and Shape—Use cylindrical test specimens 3 6
1 1
compressive strength and density specifications. ⁄16 in.(75 61.6mm)indiameterand6 6 ⁄8in.(150 63mm)
in length, with the base of each specimen perpendicular to the
longitudinal axis within the limits prescribed in 6.8.
ThistestmethodisunderthejurisdictionofASTMCommitteeC-9onConcrete
6.2 Number—Obtain at least four test specimens for com-
andConcreteAggregatesandisthedirectresponsibilityofSubcommitteeC09.21on
pressive strength tests from each sample of lightweight insu-
Lightweight Aggregates and Concrete.
lating concrete.
Current edition approved Feb. 10, 1999. Published May 1999. Originally
published as C 495 – 62 T. Last previous edition C 495 – 99.
Annual Book of ASTM Standards, Vol 04.02.
Annual Book of ASTM Standards, Vol 04.01.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
C495
6.3 Molding—In molding the specimens, place the concrete the cross-sectional areas. Determine the height of the specimen
in two approximately equal layers. Tap the sides of the mold to the nearest 0.01 in.
lightly with a rubber mallet after placing each layer until the
7. Procedure
surface of the layer has subsided approximately to a plane.
Over fill the mold when placing the second layer. Do not rod
7.1 Placing of Specimen—Wipe clean the bearing faces of
the concrete.
the upper and lower bearing blocks of the compression test
6.4 Finishing Surface—Strike off the specimens immedi-
machine and of the test specimen and place the test specimen
ately after filling the molds. Cover them in such a manner as to
on the lower bearing block. Carefully align the axis of the
prevent evaporation without marring the surface (Note 1). If
specimen with the center of thrust of the spherically seated
desired, cover the filled mold with a glass or metal plate to
block.As the spherically seated block is brought to bear on the
obtainasurfacethatwillbesuitablefortestingwithoutcapping specimen, gently rotate its movable portion by hand so that
and with a minimum of grinding.
uniform seating is obtained.
7.2 Rate of Loading—Continuously apply the load without
NOTE 1—It is desirable to place the filled mold in a moist room if one
shock at a constant rate such that the maximum load will be
is available. If this is done, protect the surface from dripping water.
reached in 65 6 15 s. Record the maximum load sustained by
6.5 Removal from Molds—Do not remove specimens from
the specimen. Note the type of failure and the appearance of
molds until danger of damage to the specimens is past. In any
the concrete.
event, remove specimens from the molds within 7 days after
moldin
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