ASTM C67:14 pdf free download – Standard Test Methods for Sampling and Testing Brick and Structural Clay Tile.
9.4. 1 Calculation—Calculate the loss in weight as a percentage of the original weight of the dried specimen.
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 Raring—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)
1 0. 1 Apparatus:
10. 1. 1 Trays or C’onrainers—Watcrtight trays or containers, having an inside depth of not less than ½ 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. (I 27.(X) and 152.4 mm) in length, having triangular, half—round, or rectangular cross sections such that the thickness (height) will he approximately ¼ in. (6.35 mm). The thickness of the two bars shall agree within 0.001 in. (0.03 mm) and, when the bars are rectangular in cross section, their width shall not exceed /I6 in. (7.9 mm).
1 0. 1 .3 Meciiis for Maintaining Constant Water Level— Suitable means for controlling the water level above the upper surface of the supports for the brick within ±0.0 1 in. (0.25 mm) (see Note 6), including means for adding water to the tray at 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 in ½ in. (3.18 mm) of water corresponds to the brick or half brick to be tested within ±2.5 %. Completely submerge the reference brick in water for not less than 3 h preceding its use.
Nom 6—A suitable means for obtaining accuracy in control of the water level is provided by attaching to the end of one of the bars two still metal wires that project upward and return, terminating in points: one of which is ½ —0.01 in. (3.18—0.25 mm) and the other Is + 0.01 in.