BS EN 993-5:2018 pdf free.Methods of test for dense shaped refractory products— Determination of cold crushing strength.
BS EN 993-5 A mechanical or hydraulic compression testing machine, fitted with a measuring devicecapable of measuring the load exerted on the test piece to within ± 2 %.The machine shall be capable of increasing the stress at the rate of 1,0 MPa’s-1±0,1 MPa·s-1, until thetest piece is unable to support the load.
The platens of the machine shall:
a) have a Rockwell hardness value between 58 HCR and 62 HCR;
b) be ground plane to a flatness tolerance of 0,03 mm over the area to be in contact with the test piece;)have a surface texture (mean roughness value R.) between 0,8 mm and 3,2 mm. This can be
checked visually or by feeling with a “mean-roughness”reference standard such as is used for flatgrinding.
The area of the upper platen shall not be greater than 100 cm2, but shall have an area greater than thecross section of the test piece.The upper platen shall work on a seating that will compensate for smalldeviations from parallelism between the platens and the test piece.A testing machine whose platens does not comply with the above requirements for size can be used inconjunction with an ancillary adaptor, such as shown in Figure 1, placed centrally between the platensof the machine. The platens of the adaptor shall comply with the machine platens requirements forhardness and flatness given in this clause.They shall have a thickness of at least 10 mm.The platens should be replaceable to allow re-machining and should not be matted.
Vernier callipers in accordance with lSO 13385-1, for measurement of test pieces (see 6.3 andClause 7)
At least four items form a sample. In the case of acceptance testing, the number of items forming thesample to be tested shall be determined according to IS0 5022.
Only one test piece shall be taken from each item to be tested, unless otherwise agreed and reported(see Clause 9).
Test piece preparation and verification
The test piece shall be extracted from the middle of the item, unless otherwise agreed.
When more than one test piece is taken from an item, it is recommended to include at least one testpiece taken from the centre, and one test piece adjacent to the hot face.
Test pieces shall be cut from the item(s) so that the load applied during testing is in the samedirection as the forming pressure during manufacture of the item, when this is known. The originalposition of the test pieces in the item(s) shall be reported. Test pieces containing cracks or visibledefects shall be discarded and this shall also be reported.Both ends of the test piece shall be made planeand parallel, grinding the surfaces where required. Water sensitive material where hydration isexpected during the time of test piece preparation and handing shall be machined dry or by using a non-reacting liquid.BS EN 993-5 pdf download.