ASTM C806-04
(Test Method)Standard Test Method for Restrained Expansion of Expansive Cement Mortar
Standard Test Method for Restrained Expansion of Expansive Cement Mortar
ABSTRACT
This test method covers the standard procedure for determination of length changes of expansive cement mortar, while under restraint, due to the development of internal forces resulting from hydration of the cement. The test apparatus is comprised of the following: molds for casting test specimens; restraining cage which consists of a threaded steel rod with steel end plates held in place by cap nuts for corrosion prevention; length comparator; tamper which shall be made of nonabsorptive, nonabrasive material such as medium-hard rubber or seasoned oak wood; device for demolding specimens; weights and weighing devices; glass graduates to measure the mixing water in a single operation; an electrically driven mechanical mixer equipped with paddle and mixing bowl; and trowel which shall have a steel blade with straight edges. The sand to be used shall comply with the graded sand requirement and shall be handled in such a manner as to prevent segregation. Details on preparation and assembly of specimen molds and restraining cage, proportioning and mixing of mortars, molding, and curing of specimens are discussed. The expansion and shrinkage of the test specimens at any age shall be calculated and the length-change data, expressed as linear expansion or contraction based on the length of the specimen at any time of molding, shall be reported. Bias and precision in the batch, single, and multi-laboratory operation shall also be identified.
SCOPE
1.1 This test method covers the determination of length changes of expansive cement mortar, while under restraint, due to the development of internal forces resulting from hydration of the cement.
1.2 The values stated in non-SI units are to be regarded as the standard. When both the inch-pound units and the SI units are present, the non-SI units are to be regarded as the standard. The values in SI units are approximate, are listed for information only, and will likely provide different values than the inch-pound units.
1.3 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. (Warning-Fresh hydraulic cement mixtures are caustic and may cause burns to skin and tissue upon prolonged exposure.)
General Information
Relations
Standards Content (Sample)
NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: C806 − 04
StandardTest Method for
1
Restrained Expansion of Expansive Cement Mortar
This standard is issued under the fixed designation C806; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope C778Specification for Sand
C1005Specification for Reference Masses and Devices for
1.1 This test method covers the determination of length
Determining Mass and Volume for Use in the Physical
changesofexpansivecementmortar,whileunderrestraint,due
Testing of Hydraulic Cements
to the development of internal forces resulting from hydration
F606Test Methods for Determining the Mechanical Proper-
of the cement.
ties of Externally and Internally Threaded Fasteners,
1.2 The values stated in non-SI units are to be regarded as
Washers, Direct Tension Indicators, and Rivets
the standard. When both the inch-pound units and the SI units
arepresent,thenon-SIunitsaretoberegardedasthestandard.
3. Terminology
The values in SI units are approximate, are listed for informa-
tion only, and will likely provide different values than the 3.1 Definitionsoftermsusedinthistestmethodaregivenin
inch-pound units. Terminology C219.
1.3 This standard does not purport to address all of the
4. Apparatus
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro-
4.1 Molds—The molds for casting test specimens, when
priate safety and health practices and determine the applica-
used in conjunction with the restraining cage described in 4.2,
bility of regulatory limitations prior to use. (Warning—Fresh
shall provide for forming either 2 by 2 by 10-in. prisms having
hydraulic cement mixtures are caustic and may cause burns to
a 10-in. gage length, or 50 by 50 by 250-mm prisms having a
2
skin and tissue upon prolonged exposure. )
250-mmgagelength.Themoldsshallotherwiseconformtothe
requirements of Practice C490, except that the gage stud
2. Referenced Documents
holder, gage studs, and spacer screws described in that speci-
3
2.1 ASTM Standards:
fication will not be used.
A307SpecificationforCarbonSteelBoltsandStuds,60000
PSI Tensile Strength 4.2 Restraining Cage, consisting of a threaded steel rod
with steel end plates held in place by nuts as shown in Fig. 1.
C157/C157MTest Method for Length Change of Hardened
Hydraulic-Cement Mortar and Concrete The rod shall be provided with cap nuts for prevention of
C219Terminology Relating to Hydraulic Cement corrosion. The rod shall conform to Specification A307 Grade
C305Practice for Mechanical Mixing of Hydraulic Cement A except, it shall support 1180-lbf (5249 N) proof load when
Pastes and Mortars of Plastic Consistency tested in accordance with Method 1 of Test Methods F606.
C490PracticeforUseofApparatusfortheDeterminationof
4.3 Length Comparator—The length comparator for mea-
Length Change of Hardened Cement Paste, Mortar, and
suring length shall conform to and be used in accordance with
Concrete
the requirements of Practice C490. If the terminals of the
C670Practice for Preparing Precision and Bias Statements
comparator are fitted with collars, they shall be such that the
for Test Methods for Construction Materials
capnutsontheendsofthethreadedrodofthespecimendonot
rest on the collar during measuring.
1
ThistestmethodisunderthejurisdictionofASTMCommitteeC01onCement
and is the direct responsibility of Subcommittee C01.13 on Special Cements. 4.4 Tamper—The tamper shall be made of nonabsorptive,
CurrenteditionapprovedJuly1,2004.PublishedJuly2004.Originallyapproved
nonabrasive material such as medium-hard rubber or seasoned
in 1975. Last previous edition approved in 1995 as C806–95. DOI: 10.1520/
oak wood, rendered nonabsorptive by immersion for 15 min in
C0806-04.
2
paraffin at approximately 392 °F (200 °C), and shall have a
SectionofSafety,ManualofCementTesting,AnnualBookofASTMStandards,
1
Vol 04.01.
cross section of about ⁄2 by 1 in. (13 by 25 mm) and
3
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
convenient length of about 6 in. (150 mm). The tamping face
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
of the tamper shall be flat and at right angles to the length of
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. the tamper.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
C806 − 04
Dimension, in. (mm) Tolerance, in. (mm)
3
A11 ⁄4 (300) .
1
B 10 (250) ⁄8 (3)
C 2 (50) .
D 1 (25) .
31 1
E1 ⁄32 (49) ⁄32
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.