MOR | Modulus of Rupture | Tile Testing | Flexural Strength Testing | IS 13630 (Part 6) ASTM C133 - Standard Test Methods Modulus of Rupture of Refractories
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Indian Standard CERAMIC TILES ‒ METHODS OF TEST PART 6 DETERMINATION OF MODULUS OF RUPTURE
Two Cylindrical Support Rods
It shall be made of metal and the parts in contact with the test specimen shall be covered with rubber having a hardness of 50 ± 5 IRHD, measured in accordance with IS 3400
(Part 2) :
1995. One rod shall be slightly pivotable and the other shall be slightly rotatable about its own axis ( see Table 1 for relevant dimensions ).
A Central Cylindrical Rod It shall be of the same diameter as the support rods and covered with a similar rubber, which transmits the load F.
5 TEST SPECIMENS
5.1 Whenever possible, whole tiles shall be tested. However, it may be necessary to cut
exceptionally large tiles (that is, those greater than 300 mm in length) and some nonrectangular
shapes in order to fit them in the apparatus. Rectangular test specimens of the largest possible size shall then be cut, having Table 1 Diameter of Rods, Thickness of Rubber and Length their centers coinciding with the centers of the tiles.
5.2 In case of doubt, results obtained using whole tiles shall always be preferred to results
obtained with cut tiles.
5.3 The minimum number of test specimens for each sample is given in Table 2.
6 PROCEDURES
6.1 If cut test specimens are to be measured, dry them in the oven at 110 ±5°C until the constant mass is reached, that is, when the difference between two successive weighing at intervals of 24 hrs is less than 0.1 percent.
6.2 Place a test specimen on the support rods, with the glazed or proper surface uppermost so that the test specimen projects by the length l beyond each support rod.
6.3 Position the central rod equidistant between the support rods. Apply the load evenly in such a way as to obtain a rate of increase of stress of 1 ± 0.2 N/mm2 per second; the actual rate per second can be calculated by the expression
6.4 Note the load to break, F.
Dimension of Tile Diameter of Rod Thickness of Rubber Overlap of Tile Beyond the Edge Supports
7 EXPRESSION OF RESULTS
7.1 Only the results for test specimens that break within a central portion of length equivalent to the diameter of the central rod shall be used to calculate the average modulus of rupture.
7.2 A minimum of five acceptable results is necessary to calculate the average value.
7.3 If there are fewer than five acceptable results, a second sample shall be tested
consisting of double the number of tiles.
7.4 A minimum of ten acceptable results is then required to calculate the average value
