1、BRITISH STANDARD BS6319-7: 1985 Testing of resin compositions for use in construction Part 7: Method for measurement of tensile strength UDC 691.342+691.537:620.172BS6319-7:1985 This British Standard, having been prepared under the directionof the Civil Engineering and Building Structures Standards
2、Committee, was published under the authority ofthe Executive Board and comesinto effect on 28 February 1985 BSI03-1999 The following BSI references relate to the work on this standard: Committee reference CSB/20 Draft for comment84/10154 DC ISBN 0 580 14069 5 Committees responsible for this British
3、Standard The preparation of this British Standard was entrusted by the Civil Engineering and Building Structures Standards Committee (CSB/-) to Technical Committee CSB/20upon which the following bodies were represented: British Adhesives and Sealants Association British Plastics Federation Concrete
4、Society Construction Industry Research and Information Association County Surveyors Society Department of the Environment (Building Research Establishment) Department of the Environment (Property Services Agency) Department of the Environment (Transport and Road Research Laboratory) Federation Epoxy
5、 Resin Formulators and Applicators Ltd. Institution of Civil Engineers Institution of Highways and Transportation Institution of Structural Engineers Plastics and Rubber Institute Society of Chemical Industry Coopted member Amendments issued since publication Amd. No. Date of issue CommentsBS6319-7:
6、1985 BSI 03-1999 i Contents Page Committees responsible Inside front cover Foreword ii 1 Scope 1 2 Definitions 1 3 Principle 1 4 Apparatus 1 5 Test specimens 1 6 Procedure 1 7 Calculations 3 8 Test report 3 Figure 1 Jaws for briquette testing machine 2 Figure 2 Dimensions of briquette test specimens
7、 3 Publications referred to Inside back coverBS6319-7:1985 ii BSI 03-1999 Foreword This Part of BS6319has been prepared under the direction of the Civil Engineering and Building Structures Standards Committee. This Part describes a method for measurement of tensile strength and is one of a series of
8、 Parts describing methods for measuring basic physical properties of resin based materials. This method of test was adapted from ASTM C190and ASTM C307, and is similar to the optional test for tensile strength previously given in BS 12 “Specification for Portland cement (ordinary and rapid-hardening
9、)” Part2:1971 “Metric units” (now withdrawn), from which the size and form of specimen and jaws is taken. This method is best suited to relatively brittle material but can nevertheless be used for materials that have a tendency to “neck” in the central portion of the specimen. The test is suitable f
10、or quality control and comparative purposes but it does not alone provide sufficient information for direct use in structural design. This Part of BS6319should be read in conjunction with Part1which provides general information and describes a method for preparing test specimens. A British Standard
11、does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. In particular, attention is drawn to the Health and Safety a
12、t Work etc. Act1974. Summary of pages This document comprises of front cover, an inside front cover, pages i and ii, pages1 to 4, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendme
13、nt table on theinside front cover.BS6319-7:1985 BSI 03-1999 1 1 Scope This Part of BS6319describes a method for measurement of the tensile strength of resin based mortars and concretes cast in the form of dumb-bell shaped briquette test specimens. This method is not applicable to unfilled systems (s
14、ee note1), or to materials having fibrous constituents (see note2) or to materials containing a filler that will not pass through a3.35mm test sieve as specified in BS410. NOTE 1The procedure described in Method320D of BS2782:Methods320A toBS2782:Methods 320F:1976is suitable for unfilled systems. NO
15、TE 2Materials having fibrous constituents often give inconsistent results when tested for tensile strength and should not be assessed using the procedure described in this standard. NOTE 3The titles of the publications referred to in this standard are listed on the inside back cover. 2 Definitions F
16、or the purposes of this Part of BS6319the definitions in BS6319-1apply together with the following. 2.1 tensile stress the tensile force carried by the test specimen per unit area of the original cross-sectional area of the central portion of the specimen 2.2 tensile strength the maximum tensile str
17、ess which the test specimen is capable of supporting 3 Principle The principle of the test is the subjection of test specimens of a defined geometry to a tensile force until failure of the specimen occurs. Measurement of the tensile stress is carried out to determine the tensile strength. 4 Apparatu
18、s 4.1 Tensile testing machine, power driven and capable of maintaining a jaw separation rate of1 0.5mm/min. A continuous indication shall be provided of the force applied to the test specimen, preferably recorded autographically with a permanent indication of the maximum force. The force scale shall
19、 be calibrated by a method that ensures that the error does not exceed the requirements for grade A of BS5214-1. The machine shall be provided with jaws of fixed profile, as detailed in Figure 1, to hold and apply force to the specimens. 4.2 Moulds. Moulds shall comply with BS6319-1so far as it appl
20、ies and shall be of a size and shape to produce specimens in accordance with 5.2. 5 Test specimens 5.1 Preparation of specimens The preparation of dumb-bell briquette test specimens, including the conditioning, proportioning and mixing of the materials and the conditioning and filling of the mould s
21、hall be in accordance with BS6319-1. The filler when sampled in accordance with BS812-102 shall pass through a3.35mm sieve as specified in BS410. 5.2 Dimensions of specimens Test specimens shall be as detailed in Figure 2. 6 Procedure 6.1 Sample Cast and test a minimum of four test specimens at a ti
22、me for each prescribed set of conditions. 6.2 Testing 6.2.1 Temperature. Carry out the test at20 1 C unless, for a specific purpose, an alternative temperature is deemed more appropriate. Maintain the test specimens at the test temperature conditions for not less than16h before testing commences. 6.
23、2.2 Measurement and mass. Measure the width and thickness of the central portion of the dumb-bell briquette test specimens to the nearest0.1mm after cleaning off any loosely adhered particles. Weigh each test specimen to determine its mass to the nearest0.1g. 6.2.3 Placing the specimen in the testin
24、g machine. Place the test specimen in the testing machine in axial alignment with the direction of pull and with the specimen positioned symmetrically in the jaws. NOTESome inconsistency of results has been attributed to specimens being incorrectly positioned in the jaws. 6.2.4 Loading. Apply a tens
25、ile force to the test specimen such that the jaws separate at a rate of1 0.5mm/min until failure occurs. Record the force at break. Conduct repeat tests at the same rate of loading. If the line of fracture occurs outside the middle-third of the specimen, do not use the result for calculating the ten
26、sile strength but declare the result in the test report. Use all other values in the calculations. If less than three valid results are obtained, declare the test to be void. Note the maximum load applied. BS6319-7:1985 2 BSI 03-1999 NOTEThe jaws specified were previously described in BS 12-2:1971 (
27、now withdrawn). Figure 1 Jaws for briquette testing machineBS6319-7:1985 BSI 03-1999 3 7 Calculations Calculate the tensile strength by dividing the load at failure by the original cross-sectional area. Also calculate the mean tensile strength for a minimum of three test specimens, originating from
28、the same mix. Express the values of tensile strength to the nearest0.1N/mm 2 . 8 Test report The following information shall be included in the test report: a) date and site of sample preparation; b) date of test; c) age of test specimen when tested (to the nearest hour, if less than3days old); d) a
29、mbient conditions during the preparation and testing of the test specimens, and the curing regime adopted; e) a complete identification of the material tested including type, source, manufacturers code numbers and history; f) mean cross-sectional area of central portion of each test specimen; g) mas
30、s of each test specimen to the nearest0.1g; h) tensile strength of each valid test specimen; i) arithmetic mean tensile strength; j) breaking loads, including those results excluded from the calculations because of the location of the fracture; k) visible defects on the surface of the test specimen
31、and in the failure plane. NOTEThe test specimens specified were previously described in BS 12-2:1971 (now withdrawn). All dimensions are in millimetres. Figure 2 Dimensions of briquette test specimens4 blankBS6319-7:1985 BSI 03-1999 Publications referred to BS410, Specification for test sieves. BS81
32、2, Testing aggregates. BS812-102, Methods for sampling. BS2782, Methods of testing plastics. BS2782:Methods320A to320F, Determination of tensile strength, elongation and elastic modulus. BS5214, Testing machines for rubbers and plastics. BS5214-1, Constant rate of traverse machines. BS6319, Testing
33、of resin compositions for use in construction. BS6319-1, Method for preparation of test specimens. ASTM C190, Standard test method for tensile strength of hydraulic cement mortars 1) . ASTM C307, Standard test method for tensile strength of chemical-resistant mortars 1) . 1) Referred to in the forew
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