ASTM C583-15 (R2021) pdf free download.Standard Test Method for Modulus of Rupture of Refractory Materials at Elevated Temperatures.
1.1 This test method covers determination of the high- temperature modulus of rupture of refractory brick or monolithic refractories in an oxidizing atmosphere and under action of a force or stress that is increased at a constant rate.
1.2 The values stated in inch-pound units are to he 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.
3.3 This test method is designed for progressive application of a force or stress on a specimen supported as a simple beam with center-point loading. Test apparatus designed for the progressive application of a strain may yield different results, especially since refractory materials will reach a semiplastic state at elevated temperatures where Hooke’s law does not apply, that is, stress is then not proportional to strain.
3.4 This test method applies to tired dense refractory brick and shapes. chemically bonded brick and shapes, shapes formed from castahies. plastics, or ramming materials, and any other refractory that can he formed to the required specimen dimension.
4. Apparatus
4.1 Use either an electrically heated or gas-tired furnace (Note 1). A typical cross section of the furnace containing the bearing edges is shown in Fig. I. At least one pair of lower bearing edges. made from volume-stable refractory material (Note 2), shall he installed in the furnace on 5-in. (127-mm) centers. A thrust column, containing the top bearing edge that is made from volume-stable refractory material, shall extend outside the furnace where means arc provided for applying a load. The lower bearing edges and the hearing end of the support column shall have rounded bearing surfaces having about a ¼-in. (6-mm) radius (Note 3). The lower bearing surfaces may be made adjustable, but must attain the standard span of 5 ± ¾2 in. (127 ± 2 mm). The length of the lower bearing surfaces shall exceed the specimen width by about ½ in. (6 mm). The load shall be applied to the upper bearing edge by any suitable means. Instrumentation for measuring the load shall be accurate to I %. The thrust column shall he maintained in vertical alignment and all bearing surfaces parallel in both horizontal directions.
Note 1—The test furnace can be so constructed so that a number of specimens may be heated and tested at the same Lime. Bearing edges and loading devices may be provided for a number of individual specimens, but a more practical method is to provide means to move individual specimens successively onto a single set of bearing edges for breaking. The use of a separate holding furnace for specimens to be transferred into the test furnace for breaking is also satisfactory.ASTM C583 pdf download.