1、INTERNATIONAL STANDARD ISO 13765-4 First edition 2004-06-01 Reference number ISO 13765-4:2004(E) ISO 2004 Refractory mortars Part 4: Determination of flexural bonding strength Mortiers rfractaires Partie 4: Dtermination de la rsistance des liaisons la flexionISO 13765-4:2004(E) ii ISO 2004 All right
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6、 in the country of the requester. ISO copyright office Case postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in SwitzerlandISO 13765-4:2004(E) ISO 2004 All rights reserved iii Foreword ISO (the International Organization for
7、Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the r
8、ight to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. Internation
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10、 an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. IS
11、O 13765-4 was prepared by Technical Committee ISO/TC 33, Refractories. ISO 13765 consists of the following parts, under the general title Refractory mortars: Part 1: Determination of consistency using the penetrating cone method Part 2: Determination of consistency using the reciprocating flow table
12、 method Part 3: Determination of joint stability Part 4: Determination of flexural bonding strength Part 5: Determination of grain size distribution (sieve analysis) Part 6: Determination of moisture content of ready-mixed mortars. iv INTERNATIONAL STANDARD ISO 13765-4:2004(E) ISO 2004 All rights re
13、served 1 Refractory mortars Part 4: Determination of flexural bonding strength 1S c o p e This part of ISO 13765 describes a method of determination of the flexural bonding strength of the bonded face between refractory bricks laid with refractory mortars (after drying and firing). 2 Normative refer
14、ences The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 8656-1, Refractory products Sampling of
15、 raw materials and unshaped products Part 1: Sampling scheme ISO 13765-1, Refractory mortars Part 1: Determination of consistency using the penetrating cone method ISO 13765-2, Refractory mortars Part 2: Determination of consistency using the reciprocating flow table method 3 Terms and definitions F
16、or the purposes of this document, the following terms and definitions apply. 3.1 flexural bonding strength maximum stress that a specimen can withstand when it is bent on a three-point bending device 4 Principle A prismatic specimen of a given size is made by bonding two test pieces of refractory br
17、ick with the refractory mortar to be tested. After drying and firing, a bending stress is applied at a given loading rate on the bonding face of the specimen at room temperature until failure of the bonding face occurs. 5 Apparatus 5.1 Loading device, consisting of two bearing edges and a loading ed
18、ge which are parallel to each other, as shown in Figure 1. The loading edge shall be located between, and isometric to, the two bearing edges. The values of and , the tolerances for the parallelism of the cross section sides and the parallelism of the top and bottom faces shall be as specified in Ta
19、ble 1. The loading device shall be able to apply a load at a uniform rate on the middle of the specimen and have the loading rate shown in Table 1. 5.2 Mixer, as specified in ISO 13765-1 or ISO 13765-2. L s RISO 13765-4:2004(E) 2 ISO 2004 All rights reserved 5.3 Electrical drying oven, fitted with a
20、 temperature controller and capable of operating at . 5.4 Consistency determining device, as specified in ISO 13765-1 or ISO 13765-2. 5.5 Balance, with a maximum weighing capacity of and capable of weighing to the nearest . 5.6 Callipers, capable of measuring to the nearest . 5.7 Furnace, capable of
21、 meeting the heating requirements specified in 7.3. 5.8 Thermocouple pyrometer. Dimensions in millimetres Key distance between the supports radius of curvature of the loading edge and bearing edges Figure 1 Loading device Table 1 Dimensions, tolerances and loading rates associated with test pieces o
22、f various sizes Test piece size Tolerance for the breadth, , and height, Tolerance for the parallelism of the cross- section sides Tolerance for the parallelism of the top and bottom faces Distance between the supports Radius of curvature, , of the loading edge and bearing edges Loading rate N/s Den
23、se shape Insulating shape mm mm mm mm mm mm mm mm L s R b h L s R l b h 115 114 76 18011 5 0,5 370 37 120 12 115 114 64 18011 5 0,5 260 26 86 8,6 100 40 40 1 0,15 0,25 18015 0,5 36 3,6 12 1,2 57,5 25 25 1 0,1 0,2 10015 0,5 13 1,3 4,2 0,42 57 40 40 1 0,15 0,25 10014 0,5 64 6,4 21 2,1 110 C 5 C 2kg 1g
24、 0,1 mmISO 13765-4:2004(E) ISO 2004 All rights reserved 3 5.9 Cutting tool. 6 Sampling and preparation of the test pieces 6.1 Sampling For dry mortar, sample the mortar in accordance with ISO 8656-1 or as agreed between parties. Reduce the sample to by quartering or with a riffle sampler. Sample rea
25、dy-mixed mortars by emptying the entire contents of the container in which the mortar is supplied into another container of larger capacity and mixing thoroughly. It is important that any supernatant liquid not be discarded. Ensure that a representative sample of the wet mixture is obtained. 6.2 Pre
26、paration of the test pieces The size of the test pieces is shown in Table 1. The actual dimensions used shall be agreed upon between parties prior to testing. Ten test pieces are required. These are used for making five test specimens, each specimen being constituted of two test pieces bonded with m
27、ortar. Cut test pieces from the refractory bricks for test following the sizes and the tolerances shown in Table 1. The adjacent edges of the test pieces shall be perpendicular to each other and the corners shall be square. The surfaces of the test pieces shall be smooth and have no cracks and the f
28、aces to be bonded shall be clean. Each test piece shall have an uncut face for bonding. The bricks used in the test shall be compatible with the mortar being tested. Before testing, place the test pieces in the drying oven, raise the temperature to and keep for or until constant weight is achieved.
29、Then cool to room temperature naturally. 7 Procedure 7.1 Preparation of the test specimens 7.1.1 For dry mortars, take using the balance and mix with water in accordance with ISO 13765-1 or ISO 13765-2 to attain the desired consistency. Determine the consistency and allow to rest for or in accordanc
30、e with the manufacturers instructions. For wet mortars, mix thoroughly and then take about . After determining the consistency, carry out the procedures described in 7.1.2. 7.1.2 Take a pair of dried test pieces and apply a layer of the well-mixed mortar to both of the uncut faces and then remove th
31、e mortar. Apply the mortar again to both of the uncut faces and then join the two mortar-covered faces together (see Figure 2). Force out the excess mortar to form a joint of , unless otherwise agreed, by pressing the top test piece and at the same time moving it laterally. Remove the excess mortar
32、forced out. The specimen shall not be wrapped and the displacement shall not be greater than . Repeat the above operation using the 10 test pieces to make five specimens. 5kg 110 C 5 C8 h 1,5 kg 30 min 1kg 2mm 0,5 mmISO 13765-4:2004(E) 4 ISO 2004 All rights reserved 7.2 Drying the test specimens Air
33、 dry the test specimens naturally at room temperature for , with each specimen resting on a face parallel to the bonded face. Carefully place the air-dried specimens on a face parallel to the bonded face in the drying oven. Raise the temperature to and hold for . Then raise the temperature to and ho
34、ld for . 7.3 Firing the test specimens Place the dried specimens on the soaking zone of the furnace. The distance between the specimens themselves and that between the specimens and the soaking plates shall not be less than . The distance between the specimens and the heating element shall not be le
35、ss than . If the soaking plates are absent, the radiant heat of the heating elements shall not directly reach the bonded faces of the specimens. When heating, maintain an oxidizing atmosphere in the furnace. Use the following heating rates: normally ; silica mortar . When the specified temperature i
36、s reached, hold for ( for silica-based mortar), over which the fluctuation of the temperature shall not exceed . After the holding period, cool the specimens in the furnace to room temperature naturally. 7.4 Determination of flexural bonding strength 7.4.1 Measure the width, , and height, , of each
37、test specimen at the bonded faces after drying and firing. Take two measurements at different points for each test specimen. Calculate the mean value to the nearestfor each test specimen. 7.4.2 Place a specimen on the bearing edges. Align the loading edge with the joint of the specimen. The deviatio
38、n shall not exceed . Apply load vertically at a rate specified in Table 1 until the failure of the bonded face occurs. Record the maximum load. Key 1m o r t a r Figure 2 Test specimen 24 h 65 C 5 C4 h 1 1 0 C 5 C1 2 h 10 mm 20 mm 5 C/min 3 C/min 3h 5h 10 C bh 0,1 mm 2mmISO 13765-4:2004(E) ISO 2004 A
39、ll rights reserved 5 7.4.3 Inspect the specimens one by one with care. If the area of voids in the bonded face of a specimen isor more, or the full bonded face of a specimen is clean and smooth, disregard that result. In this case, if the normal specimens are less than three, conduct the test again
40、from 6.2. 8C a l c u l a t i o n Calculate the flexural bonding strength for each test specimen as the modulus of rupture, , in megapascals, to the nearest , using the equation where is the maximum force exerted on the specimen, in newtons; is the distance between the supports, in millimetres; is th
41、e width of the specimen at the bonded face, in millimetres; is the height of the specimen at the bonded face, in millimetres. Report the result as the mean of the five determinations, excluding any disregarded in accordance with 7.4.3, to the nearest . 9 Test report The test report shall include the
42、 following information: a) all information necessary for identification of the material tested, including a description of the material, manufacturer, type, brand, batch number, size of test pieces, etc.; b) a reference to this part of ISO 13765 (ISO 13765-4); c) the name of the testing establishmen
43、t; d) in the case of a dry mortar, the percentage of water (or specified liquid) added; e) the results of the test, i.e. the flexural bonding strength in megapascals, including the results of the individual determinations and their mean, calculated as specified in Clause 8, and noting if the failure
44、 did not occur at the bonded face; f) the consistency of the mortar tested and the method used to determine the consistency, i.e. ISO 13765-1 or ISO 13765-2; g) the firing temperature and holding time; h) any deviations from the procedure specified; i) any unusual features (anomalies) observed during the test; j) the date of the test. 20 % F 0,1 MPa F = 3F max L s 2bh 2 F max L s b h 0,1 MPaISO 13765-4:2004(E) ICS 81.080 Price based on 5 pages ISO 2004 All rights reserved
