ASTM C806-95

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Designation: C 806 – 95
Standard Test Method for
Restrained Expansion of Expansive Cement Mortar
This standard is issued under the fixed designation C 806; 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.
1. Scope 3. Terminology
1.1 This test method covers the determination of length 3.1 Definitions of terms used in this test method are given in
changes of expansive cement mortar, while under restraint, due Terminology C 219.
to the development of internal forces resulting from hydration
4. Apparatus
of the cement.
1.2 The values stated in non-SI units are to be regarded as 4.1 Molds—The molds for casting test specimens, when
used in conjunction with the restraining cage described in 4.2,
the standard.
1.3 This standard does not purport to address all of the shall provide for forming either 2 by 2 by 10-in. prisms having
a 10-in. gage length, or 50 by 50 by 250-mm prisms having a
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro- 250-mm gage length. The molds shall otherwise conform to the
requirements of Practice C 490, except that the gage stud
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use. holder, gage studs, and spacer screws described in that speci-
fication will not be used.
2. Referenced Documents
4.2 Restraining Cage, consisting of a threaded steel rod
2.1 ASTM Standards: with steel end plates held in place by nuts as shown in Fig. 1.
A 307 Specification for Carbon Steel Bolts and Studs, The rod shall be provided with cap nuts for prevention of
60 000 PSI Tensile Strength corrosion. The rod shall conform to Specification A 307 Grade
C 157 Test Method for Length Change of Hardened- A except, it shall support 1180-lbf (5249 N) proof load when
Hydraulic-Cement Mortar and Concrete tested in accordance with Method 1 of Test Methods F 606.
C 219 Terminology Relating to Hydraulic Cement 4.3 Length Comparator—The length comparator for mea-
C 305 Practice for Mechanical Mixing of Hydraulic Cement suring length shall conform to and be used in accordance with
Pastes and Mortars of Plastic Consistency the requirements of Practice C 490. If the terminals of the
C 490 Practice for Use of Apparatus for the Determination comparator are fitted with collars, they shall be such that the
of Length Change of Hardened Cement Paste, Mortar, and cap nuts on the ends of the threaded rod of the specimen do not
Concrete rest on the collar during measuring.
C 778 Specification for Standard Sand 4.4 Tamper—The tamper shall be made of nonabsorptive,
C 1005 Specification for Weights and Weighing Devices for nonabrasive material such as medium-hard rubber or seasoned
Use in the Physical Testing of Hydraulic Cements oak wood, rendered nonabsorptive by immersion for 15 min in
E 11 Specification for Wire-Cloth Sieves for Testing Pur- paraffin at approximately 392°F (200°C), and shall have a cross
poses section of ⁄2 by 1 in. (13 by 25 mm) and convenient length of
F 606 Test Methods for Determining the Mechanical Prop- about 6 in. (150 mm). The tamping face of the tamper shall be
erties of Externally and Internally Threaded Fasteners, flat and at right angles to the length of the tamper.
Washers, and Rivets 4.5 Apparatus for Demolding Specimens—Apparatus simi-
lar to that described in the Apparatus section of Test Method
C 157, may be found useful for demolding specimens.
This test method is under the jurisdiction of ASTM Committee C-1 on Cement
4.6 Weights and Weighing Devices—Scales used shall com-
and is the direct responsibility of Subcommittee C01.13 on Special Cements.
ply with Specification C 1005.
Current edition approved Dec. 10, 1995. Published March 1996. Originally
e1
published as C 806 – 75. Last previous edition C 806 – 87 (1995) .
NOTE 1—Generally defined, the sensibility reciprocal is the change in
Annual Book of ASTM Standards, Vol 15.08.
load required to change the position of rest of the indicating element or
Annual Book of ASTM Standards, Vol 04.02.
4 elements of a nonautomatic-indicating scale a definite amount at any load.
Annual Book of ASTM Standards, Vol 04.01.
Annual Book of ASTM Standards, Vol 14.02.
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C806–95
Dimension, in. (mm) Tolerance, in. (mm)
A11 ⁄4 (300) .
B 10 (250) ⁄8 (3)
C 2 (50) .
D 1 (25) .
31 1
E1 ⁄32 (49) ⁄32 (1)
F ⁄64 (24.5) .
G ⁄8 (10) .
FIG. 1 Restraining Cage
4.7 Glass Graduates, of suitable capacities (preferably large 6. Graded Standard Sand
enough to measure the mixing water in a single operation) shall
6.1 Sand used shall comply with the graded sand require-
be made to deliver the indicated volume at 68°F (20°C). The
ment of Specification C 778.
permissible variation shall be 62 mL. These graduates shall be
Passing Sieve Percentage Retained
subdivided to at least 5 mL, except that the graduation lines
may be omitted for the lowest 10 mL for a 250-mL graduate
No. 100 (150-μm) 98 6 2
No. 50 (300-μm) 72 6 5
and the lowest 25 mL for a 500-mL graduate. The main
No. 30 (600-μm) 2 6 2
graduation lines shall be circles and shall be numbered. The
No. 16 (1.18-mm) none
least graduations shall extend at least one seventh of the way
NOTE 2—Segregation of Graded Sand—The graded standard sand
around, and intermediate graduations shall extend at least one
should be handled in such a manner as to prevent segregation, since
fifth of the way around.
variations in the grading of the sand cause variations in the consistency of
4.8 Mixer, Bowl, and Paddle—The mixer shall be an elec-
the mortar. In emptying sacks of sand into bins or in scooping sand out of
trically driven mechanical mixer of the type equipped with
bins or sacks, care should be exercised to prevent the formation of mounds
paddle and mixing bowl, as specified in the Apparatus section
of sand or craters in the sand, down the slopes of which the coarser
of Practice C 305.
particles will roll. Bins should be of sufficient size to permit these
4.9 Trowel—The trowel shall have a steel blade 4 to 6 in.
precautions. Devices for drawing the sand from bins by gravity should not
(102 to 152 mm) in length, with straight edges.
be used.
5. Temperature and Humidity
7. Test Specimen
5.1 The temperature of the air in the vicinity of the mixing
7.1 The test specimen shall bea2by2by 10-in. prism
operation, the dry materials, mixing water, molds, base plates,
having a 10-in. gage length, or a 50 by 50 by 250-mm prism
mixing bowl, moist closet or moist room, and storage water
having a 250-mm gage length. At least two specimens shall be
shall not vary from 73.4°F (23°C) by more than 63°F
prepared for each test.
(61.7°C).
5.2 The relative humidity of the laboratory shall be not less
than 50 %. The moist closet or moist room shall provid
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