1、BRITISH STANDARD BS ISO 13765-4:2004 Refractory mortars Part 4: Determination of flexural bonding strengthICS 81.080 BS ISO 13765-4:2004 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 1 February 2006 BSI 1 February 2006 ISBN 0 580 47705 3 Na
2、tional foreword This British Standard reproduces verbatim ISO 13765-4:2004 and implements it as the UK national standard. Together with BS ISO 13765-1, BS ISO 13765-2, BS ISO 13765-3, BS ISO 13765-5 and BS ISO 13765-6, it supersedes BS 1902-11:1991 which is withdrawn. The UK participation in its pre
3、paration was entrusted to Technical Committee RPI/1, Refractories, which has the responsibility to: aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep UK interests informed; monitor
4、related international and European developments and promulgate them in the UK. A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international publications referred to in this document may be foun
5、d in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a contract. Users are respo
6、nsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, the ISO title page, pages ii and iii, a blank page, pages 1 to 5 and a back cover. The BSI
7、copyright notice displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date CommentsINTERNATIONAL STANDARD ISO 13765-4 First edition 2004-06-01 Reference number ISO 13765-4:2004(E) Refractory mortars Part 4: Determination of flexural bon
8、ding strength Mortiers rfractaires Partie 4: Dtermination de la rsistance des liaisons la flexionBS ISO 13765-4:2004ii iii Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International
9、 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 right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, a
10、lso take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical commit
11、tees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the pos
12、sibility 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. ISO 13765-4 was prepared by Technical Committee ISO/TC 33, Refractories. ISO 13765 consists of the following parts, under the gene
13、ral title Refractory mortars: Part 1: Determination of consistency using the penetrating cone method Part 2: Determination of consistency using the reciprocating flow table method Part 3: Determination of joint stability Part 4: Determination of flexural bonding strength Part 5: Determination of gra
14、in size distribution (sieve analysis) Part 6: Determination of moisture content of ready-mixed mortars BS ISO 13765-4:2004. blank1 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 stren
15、gth of the bonded face between refractory bricks laid with refractory mortars (after drying and firing). 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the
16、 latest edition of the referenced document (including any amendments) applies. ISO 8656-1, Refractory products Sampling of 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, R
17、efractory mortars Part 2: Determination of consistency using the reciprocating flow table method 3 Terms and definitions For 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
18、-point bending device 4 Principle A prismatic specimen of a given size is made by bonding two test pieces of refractory brick 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
19、until failure of the bonding face occurs. 5 Apparatus 5.1 Loading device, consisting of two bearing edges and a loading edge 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
20、for the parallelism of the cross section sides and the parallelism of the top and bottom faces shall be as specified in Table 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
21、 13765-1 or ISO 13765-2. L s R BS ISO 13765-4:2004BS ISO 13765-4:2004 2 5.3 Electrical drying oven, fitted with a 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
22、capable of weighing to the nearest . 5.6 Callipers, capable of measuring to the nearest . 5.7 Furnace, capable of 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 bea
23、ring edges Figure 1 Loading device Table 1 Dimensions, tolerances and loading rates associated with test pieces of 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 face
24、s Distance between the supports Radius of curvature, , of the loading edge and bearing edges Loading rate N/s Dense shape Insulating shape mm mm mm mm mm mm mm mm L s R b h L s R l b h 115 114 76 180 1 15 0,5 370 37 120 12 115 114 64 180 1 15 0,5 260 26 86 8,6 100 40 40 1 0,15 0,25 180 1 5 0,5 36 3,
25、6 12 1,2 57,5 25 25 1 0,1 0,2 100 1 5 0,5 13 1,3 4,2 0,42 57 40 40 1 0,15 0,25 100 1 4 0,5 64 6,4 21 2,1 110 C 5 C 2kg 1g 0,1 mmBS ISO 13765-4:2004 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 agr
26、eed between parties. Reduce the sample to by quartering or with a riffle sampler. Sample ready-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 n
27、ot be discarded. Ensure that a representative sample of the wet mixture is obtained. 6.2 Preparation 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
28、making five test specimens, each specimen being constituted of two test pieces bonded with mortar. 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 s
29、hall be square. The surfaces of the test pieces shall be smooth and have no cracks and the faces 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 t
30、he drying oven, raise the temperature to and keep for or until constant weight is achieved. 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 att
31、ain the desired consistency. Determine the consistency and allow to rest for or in accordance 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 pie
32、ces and apply a layer of the well-mixed mortar to both of the uncut faces and then remove the 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 pre
33、ssing the top test piece and at the same time moving it laterally. Remove the excess mortar 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 C 8 h 1,5 kg 30 min 1kg 2
34、mm 0,5 mm4 7.2 Drying the test specimens Air 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 hol
35、d for . Then raise the temperature to and hold 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 speci
36、mens and the heating element shall not be less 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 ; sili
37、ca mortar . When the specified temperature is 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
38、 Measure the width, , and height, , of each 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
39、with the joint of the specimen. The deviation 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
40、 bh 0,1 mm 2mm BS ISO 13765-4:20045 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
41、the test again 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 mil
42、limetres; is the 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 sh
43、all include the 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 testi
44、ng establishment; 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
45、 if the failure 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)
46、 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 MPa BS ISO 13765-4:2004BS ISO 13765-4:2004 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution BSI is the independent national body responsible for preparing British Stand
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