This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what

changes have been made to the previous version. Because

it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.

American Association State Highway and Transportation

Designation:C67–09 Designation: C67 – 11 Officials Standard
AASHTO No.: T 32-70

Standard Test Methods for

Sampling and Testing Brick and Structural Clay Tile1
This standard is issued under the fixed designation C67; 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 (´) 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*
1.1 These test methods cover procedures for the sampling and testing of brick and structural clay tile. Although not necessarily
applicable to all types of units, tests include modulus of rupture, compressive strength, absorption, saturation coefficient, effect of
freezing and thawing, efflorescence, initial rate of absorption and determination of weight, size, warpage, length change, and void
area. (Additional methods of test pertinent to ceramic glazed facing tile are included in Specification C126.)
1.2 The text of this standard references notes and footnotes which provide explanatory material. These notes and footnotes
(excluding those in tables and figures) shall not be considered as requirements of the standard.
NOTE 1—The testing laboratory performing this test method should be evaluated in accordance with Practice C1093.
1.3 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical
conversions to SI units that are provided for information only and are not considered standard.
1.4 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.
2. Referenced Documents iTeh Standards
2.1 ASTM Standards:2
(https://standards.iteh.ai)
C126 Specification for Ceramic Glazed Structural Clay Facing Tile, Facing Brick, and Solid Masonry Units
C150 Specification for Portland Cement
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C1093 Practice for Accreditation of Testing Agencies for Masonry
C1232 Terminology of Masonry
E4 Practices for Force Verification of Testing Machines
E6 Terminology Relating to Methods of MechanicalASTM TestingC67-11
https://standards.iteh.ai/catalog/standards/sist/4019e82d-2138-4938-85c5-030c7d5fd2e7/astm-c67-11
3. Terminology
3.1 Definitions—Terminology E6 and Terminology C1232 shall be considered as applying to the terms used in these test
methods.
4. Sampling
4.1 Selection and Preparation of Test Specimens—For the purpose of these tests, full-size brick, tile, or solid masonry units shall
be selected by the purchaser or by the purchaser’s authorized representative. Specimens shall be representative of the lot of units
from which they are selected and shall include specimens representative of the complete range of colors, textures, and sizes.
Specimens shall be free of or brushed to remove dirt, mud, mortar, or other foreign materials unassociated with the manufacturing
process. Brushes used to remove foreign material shall have bristles of plastic (polymer) or horsehair. Wire brushes shall not be
used for preparing specimens for testing. Specimens exhibiting foreign material that is not removed by brushing shall be discarded
to ensure that damaged or contaminated specimens are not tested.
4.2 Number of Specimens:
4.2.1 Brick—For the modulus of rupture, compressive strength, abrasion resistance, and absorption determinations, at least ten
individual brick shall be selected for lots of 1 000 000 brick or fraction thereof. For larger lots, five additional specimens shall be

1
These test methods are under the jurisdiction of Committee C15 on Manufactured Masonry Units and is the direct responsibility of Subcommittee C15.02 on Brick and
Structural Clay Tile.
Current edition approved June 1, 2009.2011. Published June 2009.2011. Originally approved in 1937. Last previous edition approved in 20082009 as C67–08.C67 – 09.
DOI: 10.1520/C0067-09.10.1520/C0067-11.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.

*A Summary of Changes section appears at the end of this standard.

Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.

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 C67 – 11
selected from each additional 500 000 brick or fraction thereof. Additional specimens are taken at the discretion of the purchaser.
4.2.2 Structural Clay Tile—For the weight determination and for compressive strength and absorption tests, at least five tile
shall be selected from each lot of 250 tons (226.8 Mg) or fraction thereof. For larger lots, five additional specimens shall be tested
for each 500 tons (453.6 Mg) or fraction thereof. In no case shall less than five tile be taken. Additional specimens are taken at
the discretion of the purchaser.
4.3 Identification—Each specimen shall be marked so that it may be identified at any time. Markings shall cover not more than
5 % of the superficial area of the specimen.

5. Specimen Preparation
5.1 Weight Determination:
5.1.1 Drying—Dry the test specimens in a ventilated oven at 230 to 239°F (110 to 115°C) for not less than 24 h and until two
successive weighings at intervals of 2 h show an increment of loss not greater than 0.2 % of the last previously determined weight
of the specimen.
5.1.2 Cooling—After drying, cool the specimens in a drying room maintained at a temperature of 75 6 15°F (24 6 8°C), with
a relative humidity between 30 and 70 %. Store the units free from drafts, unstacked, with separate placement, for a period of at
least 4 h and until the surface temperature is within 5°F (2.8°C) of the drying room temperature. Do not use specimens noticeably
warm to the touch for any test requiring dry units. The specimens shall be stored in the drying room with the required temperature
and humidity maintained until tested.
5.1.2.1 An alternative method of cooling the specimens to approximate room temperature shall be permitted as follows: Store
units, unstacked, with separate placement, in a ventilated room maintained at a temperature of 75 6 15°F (24 6 8°C), with a
relative humidity between 30 and 70 % for a period of 4 h and until the surface temperature is within 5°F (2.8°C) of the ventilated
room temperature, with a current of air from an electric fan passing over them for a period of at least 2 h. The specimens shall
be stored in the ventilated room with the required temperature and humidity maintained until tested.
5.1.3 Weighing and Report:

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5.1.3.1 Weigh five dry full size specimens. The scale or balance used shall have a capacity of not less than 3000 g and shall
be sensitive to 0.5 g.
5.1.3.2 Report results separately for each specimen to the nearest 0.1 g, with the average of all specimens tested to the nearest
0.1 g. (https://standards.iteh.ai)
5.2 Removal of Silicone Coatings from Brick Units—The silicone coatings intended to be removed by this process are any of

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the various polymeric organic silicone compounds used for water-resistant coatings of brick units. Heat the brick at 950 6 50°F
(510 6 28°C) in an oxidizing atmosphere for a period of not less than 3 h. The rate of heating and cooling shall not exceed 300°F
(149°C) per h.
NOTE 2—Where indicated for specific individual tests, additionalASTM
specimenC67-11
preparation may be required.

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6. Modulus of Rupture (Flexure Test)
6.1 Test Specimens—The test specimens shall consist of whole dry full-size units (see 5.1.1). Five such specimens shall be
tested.
6.2 Procedure:
6.2.1 Support the test specimen flatwise unless specified and reported otherwise (that is, apply the load in the direction of the
depth of the unit) on a span approximately 1 in. (25.4 mm) less than the basic unit length and loaded at midspan. If the specimens
have recesses (panels or depressions) place them so that such recesses are on the compression side. Apply the load to the upper
surface of the specimen through a steel bearing plate 1⁄4 in. (6.35 mm) in thickness and 11⁄2 in. (38.10 mm) in width and of a length
at least equal to the width of the specimen.
6.2.2 Make sure the supports for the test specimen are free to rotate in the longitudinal and transverse directions of the test
specimen and adjust them so that they will exert no force in these directions.
6.2.3 Speed of Testing—The rate of loading shall not exceed 2000 lbf (8896 N)/min. but this requirement is considered as being
met if the speed of the moving head of the testing machine immediately prior to application of the load is not more than 0.05 in.
(1.27 mm)/min.
6.3 Calculation and Report:
6.3.1 Calculate and report the modulus of rupture of each specimen to the nearest 1 psi (0.01 MPa) as follows:
S 5 3W~l / 2 2 x! / bd 2
(1)

where:
S = modulus of rupture of the specimen at the plane of failure, lb/in.2 (Pa),
W = maximum load indicated by the testing machine, lbf (N),
l = distance between the supports, in. (mm),
b = net width, (face to face minus voids), of the specimen at the plane of failure, in. (mm),
d = depth, (bed surface to bed surface), of the specimen at the plane of failure, in. (mm), and

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x = average distance from the midspan of the specimen to the plane of failure measured in the direction of the span along
the centerline of the bed surface subjected to tension, in. (mm).
6.3.2 Calculate and report the average of the modulus of rupture determinations to the nearest 1 psi (0.01 MPa).
7. Compressive Strength
7.1 Test Specimens:
7.1.1 Brick—The test specimens shall consist of dry half brick (see 5.1.1), the full height and width of the unit, with a length
equal to one half the full length of the unit 61 in. (25.4 mm), except as described below. If the test specimen, described above,
exceeds the testing machine capacity, the test specimens shall consist of dry pieces of brick, the full height and width of the unit,
with a length not less than one quarter of the full length of the unit, and with a gross cross-sectional area perpendicular to bearing
not less than 14 in.2 (90.3 cm2). Test specimens shall be obtained by any method that will produce, without shattering or cracking,
a specimen with approximately plane and parallel ends. Five specimens shall be tested.
7.1.2 Structural Clay Tile—Test five dry tile specimens in a bearing bed length equal to the width 61 in. (25.4 mm); or test
full-size units.
7.2 Capping Test Specimens:
7.2.1 All specimens shall be dry and cool within the meaning of 5.1.1 and 5.1.2 before any portion of the capping procedure
is carried out.
7.2.2 If the surface which will become bearing surfaces during the compression test are recessed or paneled, fill the depressions
with a mortar composed of 1 part by weight of quick-hardening cement conforming to the requirements for Type III cement of
Specification C150, and 2 parts by weight of sand. Age the specimens at least 48 h before capping them. Where the recess exceeds
1⁄2 in. (12.7 mm), use a brick or tile slab section or metal plate as a core fill. Cap the test specimens using one of the two procedures

described in 7.2.3 and 7.2.4.

7.2.3 Gypsum Capping—Coat the two opposite bearing surfaces of each specimen with shellac and allow to dry thoroughly. Bed
one of the dry shellacked surfaces of the specimen in a thin coat of neat paste of calcined gypsum (plaster of paris) that has been

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spread on an oiled nonabsorbent plate, such as glass or machined metal. The casting surface plate shall be plane within 0.003 in.
(0.076 mm) in 16 in. (406.4 mm) and sufficiently rigid; and so supported that it will not be measurably deflected during the capping
operation. Lightly coat it with oil or other suitable material. Repeat this procedure with the other shellacked surface. Take care that
(https://standards.iteh.ai)
the opposite bearing surfaces so formed will be approximately parallel and perpendicular to the vertical axis of the specimen and
the thickness of the caps will be approximately the same and not exceeding 1⁄8 in. (3.18 mm). Age the caps at least 24 h before
testing the specimens.
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NOTE 3—A rapid-setting industrial type gypsum is frequently used for capping.
7.2.4 Sulfur-Filler Capping—Use a mixture containing 40 to 60 weight % sulfur, the remainder being ground fire clay or other
suitable inert material passing a No. 100 (150-µm) sieve ASTM
with orC67-11
without plasticizer. The casting surface plate requirements shall
be as https://standards.iteh.ai/catalog/standards/sist/4019e82d-2138-4938-85c5-030c7d5fd2e7/astm-c67-11
described in 7.2.3. Place four 1-in. (25.4-mm) square steel bars on the surface plate to form a rectangular mold approximately
1⁄2 in. (12.7 mm) greater in either inside dimension than the specimen. Heat the sulfur mixture in a thermostatically controlled

heating pot to a temperature sufficient to maintain fluidity for a reasonable period of time after contact with the surface being
capped. Take care to prevent overheating, and stir the liquid in the pot just before use. Fill the mold to a depth of 1⁄4 in. (6.35 mm)
with molten sulfur material. Place the surface of the unit to be capped quickly in the liquid, and hold the specimen so that its
vertical axis is at right angles to the capping surface. The thickness of the caps shall be approximately the same. Allow the unit
to remain undisturbed until solidification is complete. Allow the caps to cool for a minimum of 2 h before testing the specimens.
7.3 Procedure:
7.3.1Test7.3.1 Test brick specimens flatwise (that is, the load shall be applied perpendicular to the bed surface of the brick with
the brick in the stretcher position). Test structural clay tile specimens in a position such that the load is applied in the same direction
as in service. Center the specimens under the spherical upper bearing within 1⁄16 in. (1.59 mm).
7.3.2 The testing machine shall conform to the requirements of Practices E4.
7.3.3 The upper bearing shall be a spherically seated, hardened metal block firmly attached at the center of the upper head of
the machine. The center of the sphere shall lie at the center of the surface of the block in contact with the specimen. The block
shall be closely held in its spherical seat, but shall be free to turn in any direction, and its perimeter shall have at least 1⁄4 in. (6.35
mm) clearance from the head to allow for specimens whose bearing surfaces are not exactly parallel. The diameter of the bearing
surface shall be at least 5 in. (127.00 mm). Use a hardened metal bearing block beneath the specimen to minimize wear of the lower
platen of the machine. The bearing block surfaces intended for contact with the specimen shall have a hardness not less than
HRC60 (HB 620). These surfaces shall not depart from plane surfaces by more than 0.001 in. (0.03 mm). When the bearing area
of the spherical bearing block is not sufficient to cover the area of the specimen, place a steel plate with surfaces machined to true
planes within 6 0.001 in. (0.03 mm), and with a thickness equal to at least one third of the distance from the edge of the spherical
bearing to the most distant corner between the spherical bearing block and the capped specimen.
7.3.4 Speed of Testing—Apply the load, up to one half of the expected maximum load, at any convenient rate, after which, adjust
the controls of the machine so that the remaining load is applied at a uniform rate in not less than 1 nor more than 2 min.
7.4 Calculation and Report:

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 C67 – 11
7.4.1 Calculate and report the compressive strength of each specimen to the nearest 10 psi (0.01 MPa) as follows:
Compressive strength, C 5 W / A (2)

where:
C = compressive strength of the specimen, lb/in.2 (or kg/cm2) (or Pa·104),
W = maximum load, lbf, (or kgf) (or N), indicated by the testing machine, and
A = average of the gross areas of the upper and lower bearing surfaces of the specimen, in.2 (or cm2).
NOTE 4—When compressive strength is to be based on net area (example: clay floor tile), substitute for A in the above formula the net area, in in.2
(or cm2), of the fired clay in the section of minimum area perpendicular to the direction of the load.
7.4.2 Calculate and report the average of the compressive strength determinations to the nearest 10 psi (0.1 MPa).
8. Absorption
8.1 Accuracy of Weighings:
8.1.1 Brick—The scale or balance used shall have a capacity of not less than 2000 g, and shall be sensitive to 0.5 g.
8.1.2 Tile—The balance used shall be sensitive to within 0.2 % of the weight of the smallest specimen tested.
8.2 Test Specimens:
8.2.1 Brick—The test specimens shall consist of half brick conforming to the requirements of 7.1.1. Five specimens shall be
tested.
8.2.2 Tile—The specimens for the absorption test shall consist of five tile or three representative pieces from each of these five
tile. If small pieces are used, take two from the shell and one from an interior web, the weight of each piece being not less than
227 g. The specimens shall have had their rough edges or loose particles ground off and, if taken from tile that have been subjected
to compressive strength tests, specimens shall be free of cracks due to failure in compression.
8.3 5-h and 24-h Submersion Tests:
8.3.1 Procedure:

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8.3.1.1 Dry and cool the test specimens in accordance with 5.1.1 and 5.1.2 and weigh each one.
8.3.1.2 Saturation—Submerge the dry, cooled specimen, without preliminary partial immersion, in clean water (soft, distilled
or rain water) at 60 to 86°F (15.5 to 30°C) for the specified time. Remove the specimen, wipe off the surface water with a damp
(https://standards.iteh.ai)
cloth and weigh the specimen. Complete weighing of each specimen within 5 min after removing the specimen from the bath.
8.3.2 Calculation and Report:

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8.3.2.1 Calculate and report the cold water absorption of each specimen to the nearest 0.1 % as follows:
/
Absorption, % 5 100~Ws 2 Wd! Wd (3)

where:
Wd = dry weight of the specimen, and ASTM C67-11
Ws =https://standards.iteh.ai/catalog/standards/sist/4019e82d-2138-4938-85c5-030c7d5fd2e7/astm-c67-11
saturated weight of the specimen after submersion in cold water.
8.3.2.2 Calculate and report the average cold water absorption of all specimens to the nearest 0.1 %.
8.4 1-h, 2-h, and 5-h Boiling Tests:
8.4.1 Test Specimens—The test specimens shall be the same five specimens used in the 5-h or 24-h cold-water submersion test
where required and shall be used in the state of saturation existing at the completion of that test.
8.4.2 Procedure:
8.4.2.1 Return the specimen that has been subjected to the cold-water submersion to the bath, and subject it to the boiling test
as described in 8.4.2.2.
8.4.2.2 Submerge the specimen in clean water (soft, distilled or rain water) at 60 to 86°F (15.5 to 30°C) in such a manner that
water circulates freely on all sides of the specimen. Heat the water to boiling, within 1 h, boil continuously for specified time, and
then allow to cool to 60 to 86°F (15.5 to 30°C) by natural loss of heat. Remove the specimen, wipe off the surface water with a
damp cloth, and weigh the specimen. Complete weighing of each specimen within 5 min after removing the specimen from the
bath.
8.4.2.3 If the tank is equipped with a drain so that water at 60 to 86°F (15.5 to 30°C) passes through the tank continuously and
at such a rate that a complete change of water takes place in not more than 2 min, make weighings at the end of 1 h.
8.4.3 Calculation and Report:
8.4.3.1 Calculate and report the boiling water absorption of each specimen to the nearest 0.1 % as follows:
Absorption, % 5 100~W b 2 Wd! / Wd (4)

where:
Wd = dry weight of the specimen, and
Wb = saturated weight of the specimen after submersion in boiling water.
8.4.3.2 Calculate and report the average boiling water absorption of all specimens to the nearest 0.1 %.
8.5 Saturation Coeffıcient:
8.5.1 Calculate and report the saturation coefficient of each specimen to the nearest 0.01 as follows:

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 C67 – 11
Saturation coefficient 5 ~Ws2 2 W d! / ~W b
5
2 W d! (5)

where:
Wd = dry weight of the specimen,
Ws2 = saturated weight of the specimen after 24-h submersion in cold water, and
Wb 5 = saturated weight of the specimen after 5-h submersion in boiling water.
8.5.2 Calculate and report the average saturation coefficient of all specimens to the nearest 0.01.
9. Freezing and Thawing
9.1 Apparatus:
9.1.1 Compressor, Freezing Chamber, and Circulator of such design and capacity that the temperature of the air in the freezing
chamber will not exceed 16°F (−9°C) 1 h after introducing the maximum charge of units, initially at a temperature not exceeding
90°F (30°C).
9.1.2 Trays and Containers, shallow, metal, having an inside depth of 11⁄2 6 1⁄2 in. (38.1 6 12.7 mm), and of suitable strength
and size so that the tray with a charge of frozen units can be removed from the freezing chamber by one man.
9.1.3 Balance, having a capacity of not less than 2000 g and sensitive to 0.5 g.
9.1.4 Drying Oven that provides a free circulation of air through the oven and is capable of maintaining a temperature between
230 and 239°F (110 and 115°C).
9.1.5 Thawing Tank of such dimensions as to permit complete submersion of the specimens in their trays. Adequate means shall
be provided so that the water in the tank may be kept at a temperature of 75 6 10°F (24 6 5.5°C).
9.1.6 Drying Room, maintained at a temperature of 75 6 15°F (24 6 8°C), with a relative humidity between 30 and 70 %, and
free from drafts.
9.2 Test Specimens:
9.2.1 Brick—The test specimens shall consist of half brick with approximately plane and parallel ends. If necessary, the rough
ends may be smoothed by trimming off a thin section with a masonry saw. The specimens shall be free from shattering or

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unsoundness, visually observed, resulting from the flexure or from the absorption tests. Additionally, prepare specimens by
removing all loosely adhering particles, sand or edge shards from the surface or cores. Test five specimens.
9.2.2 Structural Clay Tile—The test specimens shall consist of five tile or of a cell not less than 4 in. (101.6 mm) in length sawed
from each of the five tile.
9.3 Procedure:
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9.3.1 Dry and cool the test specimens as prescribed in 5.1.1 and 5.1.2 and weigh and record the dry weight of each.
9.3.2 Carefully examine each specimen for cracks. A crack is defined as a fissure or separation visible to a person with normal
vision from a distance of one foot under an illumination of not less than 50 fc. Mark each crack its full length with an indelible
felt marking pen.
9.3.3 Submerge the test specimens in the water of theASTM C67-11
thawing tank for 4 6 1⁄2 h.
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9.3.4 Remove the specimens from the thawing tank and stand them in the freezing trays with one of their head faces down. Head
face is defined as the end surfaces of a whole rectangular brick (which have the smallest area). (See Note 5.) A space of at least
1⁄2 in. (12.7 mm) shall separate the specimens as placed in the tray. Pour sufficient water into the trays so that each specimen stands

in 1⁄2 in. depth of water and then place the trays and their contents in the freezing chamber for 20 6 1h. in. depth of water and
then place the trays and their contents in the freezing chamber for 20 6 1 h.
NOTE 5—The dimensions of some brick may prevent specimens from standing without support on one of their head faces. In such a case, any suitable
rack or support that will achieve the 1⁄2 in. (12.7 mm) separation of specimens and the specimen standing in 1⁄2 in. (12.7 mm) depth of water will suffice.
9.3.5 Remove the trays from the freezing chamber after 20 6 1 h and totally immerse them and their contents in the water of
the thawing tank for 4 6 1⁄2 h.
9.3.6 Freeze the test specimens by the procedure in 9.3.4 one cycle each day of the normal work week. Following the 4 6 1⁄2
h thawing after the last freeze-thaw cycle of the normal work week, remove the specimens from the trays and store them for 44
6 1 h in the drying room. Do not stack or pile units. Provide a space of at least 1 in. (25.4 mm) between all specimens. Following
this period of air drying, inspect the specimens, submerge them in the water of the thawing tank for 4 6 1⁄2 h, and again subject
them to a normal week of freezing and thawing cycles in accordance with 9.3.4 and 9.3.5. When a normal 5-day work week is
interrupted, put specimens into a drying cycle which may extend past the 44 6 1 h drying time outlined in the procedures of this
section.
9.3.7 Continue the alternations of drying and submersion in water for 4 6 1⁄2 h, followed by 5 cycles of freezing and thawing
or the number of cycles needed to complete a normal work week, until a total of 50 cycles of freezing and thawing has been
completed. Stop the test if the test specimen develops a crack as defined in 9.4.3, breaks, or appears to have lost more than 3 %
of its original weight by disintegration as judged by visual inspection.
9.3.8 After completion of 50 cycles, or when the test specimen has been withdrawn from test as a result of disintegration, dry
and weigh the specimen as prescribed in 9.3.1.
9.4 Calculations, Examination, Rating and Report:
9.4.1 Calculation—Calculate the loss in weight as a percentage of the original weight of the dried specimen.

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 C67 – 11
9.4.2 Examination—Re-examine the surface of the specimens for cracks (see 9.3.2) and record the presence of any new cracks
developed during the freezing-thawing testing procedure. Measure and record the length of the new cracks. Examine the specimens
for disintegration during the freeze-thaw process.
9.4.3 Rating—A specimen is considered to fail the freezing and thawing test under any of the following circumstances:
9.4.3.1 Breakage and Weight Loss—A separation or disintegration resulting in a weight loss of greater than that permitted by
the referenced unit specification for the appropriate classification.
9.4.3.2 Cracking—A specimen develops a crack during the freezing and thawing procedure that exceeds the length permitted
by the referenced unit standard for the appropriate classification.
If none of the above circumstances occur, the specimens are considered to pass the freezing and thawing test.
9.4.4 Report—The report shall state whether the sample passed or failed the test. Any failures shall include the rating and the
reason for classification as a failure and the number of cycles causing failure in the event failure occurs prior to 50 cycles.
10. Initial Rate of Absorption (Suction) (Laboratory Test)
10.1 Apparatus:
10.1.1 Trays or Containers—Watertight trays or containers, having an inside depth of not less than 1⁄2 in. (12.7 mm), and of such
length and width that an area of not less than 300 in.2 (1935.5 cm2) of water surface is provided. The bottom of the tray shall
provide a plane, horizontal upper surface, when suitably supported, so that an area not less than 8 in. (203.2 mm) in length by 6
in. (152.4 mm) in width will be level when tested by a spirit level.
10.1.2 Supports for Brick—Two noncorrodible metal supports consisting of bars between 5 and 6 in. (127.00 and 152.5 mm)
in length, having triangular, half-round, or rectangular cross sections such that the thickness (height) will be approximately 1⁄4 in.
(6.35 mm). The thickness of the two bars shall agree within 0.001 in. (0.03 mm) and, if the bars are rectangular in cross section,
their width shall not exceed 5⁄16 in. (7.9 mm).
10.1.3 Means for Maintaining Constant Water Level—Suitable means for controlling the water level above the upper surface
of the supports for the brick within 60.01 in. (0.25 mm) (see Note 5), including means for adding water to the tray at a rate
corresponding to the rate of removal by the brick undergoing test (see Note 6), including means for adding water to the tray at
iTeh Standards
a rate corresponding to the rate of removal by the brick undergoing test (see Note 7). For use in checking the adequacy of the
method of controlling the rate of flow of the added water, a reference brick or half brick shall be provided whose displacement

(https://standards.iteh.ai)
in 1⁄8 in. (3.18 mm) of water corresponds to the brick or half brick to be tested within 62.5 %. Completely submerge the reference
brick in water for not less than 3 h preceding its use.

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NOTE5—A 6—A suitable means for obtaining accuracy in control of the water level may be provided by attaching to the end of one of the bars two
stiff metal wires that project upward and return, terminating in points; one of which is 1⁄8 − 0.01 in. (3.18 − 0.25 mm) and the other 1⁄8 + 0.01 in.
(3.18 + 0.25 mm) above the upper surface or edge of the bar. Such precise adjustment is obtainable by the use of depth plates or a micrometer microscope.
When the water level with respect to the upper surface or edge of the bar is adjusted so that the lower point dimples the water surface when viewed by
reflected light and the upper point is not in contact with the water, ASTM
the water C67-11
level is within the limits specified. Any other suitable means for fixing an
maintaining a constant depth of immersion may be used if equivalent accuracy is obtained. As an example of such other suitable means, there may be
mentionedhttps://standards.iteh.ai/catalog/standards/sist/4019e82d-2138-4938-85c5-030c7d5fd2e7/astm-c67-11
the use of rigid supports movable with respect to the water level.
NOTE6—A 7—A rubber tube leading from a siphon or gravity feed and closed by a spring clip will provide a suitable manual control. The so-called
“chicken-feed” devices as a rule lack sensitivity and do not operate with the very small changes in water level permissible in this test.
10.1.4 Balance, having a capacity of not less than 3000 g, and sensitive to 0.5 g.
10.1.5 Drying Oven, conforming to the requirements of 9.1.4.
10.1.6 Constant-Temperature Room, maintained at a temperature of 70 6 2.5°F (21 6 1.4°C).
10.1.7 Timing Device—A suitable timing device, preferably a stop watch or stop clock, which shall indicate a time of 1 min
to the nearest 1 s.
10.2 Test Specimens, consisting of whole brick. Five specimens shall be tested.
10.3 Procedure:
10.3.1 The initial rate of absorption shall be determined for the test specimen as specified, either oven-dried or ambient
air-dried. If not specified, the initial rate of absorption shall be determined for the test specimens oven-dried. Dry and cool the test
specimens in accordance with the applicable procedures 10.3.1.1 or 10.3.1.2. Complete the test procedure in accordance with
10.3.2, 10.3.3, and 10.3.4.
NOTE7—There 8—There is no correlated relationship between the value of initial rate of absorption for ambient air-dried and oven-dried units. The
test methods provide different information.
10.3.1.1 Oven-dried Procedure—Dry and cool the test specimens in accordance with 5.1.1 and 5.1.2.
10.3.1.2 Ambient Air-dried Procedure —Store units unstacked, with separate placement in a ventilated room maintained at a
temperature of 75 6 15°F (24 6 8°C) with a relative humidity between 30 % and 70 % for a period of 4 h, with a current of air
from an electric fan passing over them for a period of at least 2 h. Continue until two successive weighings at intervals of 2 h show
an increment of loss not greater than 0.2 % of the last previously determined weight of the specimen.
10.3.2 Measure to the nearest 0.05 in. (1.27 mm) the length and width of the flatwise surface of the test specimen of rectangular
units or determine the area of other shapes to similar accuracy that will be in contact with the water. Weigh the specimen to the
nearest 0.5 g.