1、BRITISH STANDARD BS6319-6: 1984 Testing of resin compositions for use in construction Part 6: Method for determination of modulus of elasticity in compression UDC691.342+691.537:620.172.225BS6319-6:1984 This British Standard, having been prepared under the directionof the Civil Engineeringand Buildi
2、ng Structures Standards Committee,was published underthe authority of the BoardofBSI and comes intoeffecton 29 June1984 BSI 07-1999 The following BSI references relate to the work on this standard: Committee reference CSB/20 Draft for comment83/12444 DC ISBN 0 580 13783 X Committees responsible for
3、this British Standard The preparation of this British Standard was entrusted by the Civil Engineering and Building Structures Standards Committee (CSB/-) to Technical Committee CSB/20 upon which the following bodies were represented: British Adhesive Manufacturers Association British Plastics Federa
4、tion Cement and Concrete Association Concrete 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
5、and Road Research Laboratory) Federation of Epoxy 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 pub
6、lication Amd. No. Date of issue CommentsBS6319-6:1984 BSI 07-1999 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 2 7 Calculation 2 8 Test report 2 Publications referred to Inside back coverBS6
7、319-6:1984 ii BSI 07-1999 Foreword This Part of this British Standard has been prepared under the direction of the Civil Engineering and Building Structures Standards Committee. This Part describes a method for measuring the modulus of elasticity and is one of a series of Parts describing methods fo
8、r measuring basic physical properties of resin based materials. This Part of this British Standard should be read in conjunction with Part1 which provides general information and describes a method for preparing test specimens. A British Standard does not purport to include all the necessary provisi
9、ons 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. Summary of pages This document comprises a front cover, an inside front cover, pagesi andii, pages1 and 2, an ins
10、ide 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 amendment table on the inside front cover.BS6319-6:1984 BSI 07-1999 1 1 Scope This Part of BS6319 describes a method for the determination of t
11、he modulus of elasticity in compression of specimens of resin based mortars and concretes in the form of rectangular prisms. NOTEThe titles of the publications referred to in this standard are listed on the inside back cover. 2 Definitions For the purposes of this Part of BS6319 the definitions give
12、n in BS6319-1 apply, together with the following. 2.1 compressive stress the compressive force carried at any time by the test specimen per unit area of the original cross section 2.2 compressive strain the ratio of the change in the distance between two reference points along the axis of the test s
13、pecimen when related to their original spacing 2.3 elastic modulus the ratio of stress to corresponding strain below the proportional limit, where the proportional limit is the greatest stress which a material is capable of supporting without any deviation from proportionality of stress to strain (H
14、ookes Law) 2.4 secant modulus the ratio of stress to corresponding strain measured relative to a level of pre-stress applied to bed firmly the specimen platens and ball seating. Accordingly, the secant modulus is based on the stress required to extend the gauge length of the test specimen by0.2% fro
15、m a pre-stress of approximately10% of the expected force at0.002 strain NOTEIn general, the secant modulus is defined as the ratio of stress to corresponding strain at any given point on the stress-strain curve. However, with specimens loaded in a compression testing machine, the above definition ap
16、plies. 3 Principle The principle of the test is the subjection of a prism of4.1 aspect ratio to a controlled axial compressive load and relating the compressive stress to the longitudinal strain induced by that stress. 4 Apparatus 4.1 Compression testing machine, of suitable capacity for the test, i
17、.e.when the expected load at failure of the specimen lies in the upper four-fifths of the selected range of the machine being used, and complying with clauses3 to7 of BS1881-115:1983. It shall be capable of applying load at the rate specified in6.2.4 and shall comply with the requirements for grade
18、A of BS1610 as regards repeatability and accuracy. If a compression cage is used to convert the action of a tensile or universal test machine to the compressive mode, a sub-assembly shall be used to provide the necessary self-alignment facility to one platen. The auxiliary platens shall comply with
19、BS1881-115. A spacing block or blocks may be interposed between the prism or the auxiliary platen and the lower machine platen to reduce the test space, provided that the system is stable throughout the test and means are available for the prism to be correctly centered. No more than two blocks plus
20、 an auxiliary platen shall be used. Each spacing block shall be solid with a rectangular vertical section, and shall support the prism or the auxiliary platen over the whole of its area. The properties of the material, and the surface flatness, surface texture and parallelism of the contact faces of
21、 each block shall comply with the requirements of BS1881-115. 4.2 Moulds, complying with the requirements of BS6319-1 and of a size to produce rectangular prisms in accordance with5.2. 4.3 Two strain gauges or compressometers, each having a minimum gauge length of20mm and maximum sensitivity50 units
22、 of microstrain and providing a continuous indication of change in the gauge length. NOTE 1The change should preferably be recorded autographically in the form of a force/compression curve. The instrument shall be calibrated by a suitable method to ensure that the error does not exceed2% of the actu
23、al strain. NOTE 2The instrument needs to be essentially free from inertia lag at the specified speed of testing. 5 Test specimens 5.1 Preparation of test specimens. The preparation of test specimens, including the conditioning, proportioning and mixing of the materials and the conditioning and filli
24、ng of the mould shall be in accordance with BS6319-1.BS6319-6:1984 2 BSI 07-1999 5.2 Dimensions of test specimens. Test specimens shall be rectangular prisms of size40mm 40mm 160mm unless the material contains an aggregate, of which at least90%, when sampled in accordance with BS812-1, will not pass
25、 through a BS410 test sieve of nominal mesh size5mm. For such materials the width and depth of the prism shall be between7.0 and8.0 times the nominal mesh size of the smallest BS410 sieve through which90% of the aggregate will pass. The length to width ratio of the prism shall be4:1. 6 Procedure 6.1
26、 Sample. Test a minimum of three specimens at a time for each prescribed set of test 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 condi
27、tions for not less than16h before testing commences. 6.2.2 Measurement. Measure the width and thickness of the specimen at its centre to the nearest0.1mm and calculate the cross-sectional area. 6.2.3 Placing the test specimen in the testing machine. Fit two strain gauges or compressometers to opposi
28、te cast sides of the test specimen, their gauge lengths being centrally disposed over the axis of the test specimen. When a compressometer is attached to the test specimen, take care to ensure that any distortion of, or damage to, the test specimen is minimal. There shall be no slippage between the
29、compressometer grips and the test specimen. NOTEBS4408-2 gives guidance on the use of strain gauges. Wipe clean the bearing surfaces of the testing machine and of any auxiliary platens. Remove any loose grit or other material from the surfaces of the test specimen that are to be in contact with the
30、compression platens. Place the test specimen in the machine in such a manner that the load is applied axially, i.e.parallel to the long axis of the test specimen. Place the test specimen on the lower machine platen and carefully centre. Do not use packing at any of the interfaces between the test sp
31、ecimen, auxiliary platens, spacing blocks and machine platens. 6.2.4 Loading. Apply a load smoothly at a rate of2N/s to10N/s until a strain of approximately0.0022 is indicated. Record the applied load, N 1 . Smoothly remove and re-apply the load at least twice to ensure that the specimen and platens
32、 are well seated and that the strain gauges are indicating consistently. If the individual strains are not within a range of 10% of their mean value at N 1 , centre the test specimen again and repeat the procedure. If it is not possible to reduce the differences to within this range, do not proceed
33、with the test. Next, zero the strain gauges (or the recorder) while the specimen is under a load, N 2 , approximately10% of that previously recorded. Measure the increase in strain as the load is quickly cycled between loads N 2and N 1 , four cycles being recorded. 7 Calculation Calculate the secant
34、 modulus by dividing the difference between the two levels of applied load by the means of the eight strain readings and expressing this as compressive stress per unit cross-sectional area. Calculate the mean secant modulus for a minimum of three specimens originating from the same mix. Express the
35、value of the secant modulus to the nearest0.1kN/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) ambient conditions during the preparation, curing and testing of the test specimen and the age of the test
36、specimen when tested; d) complete identification of the material tested including type, source, manufacturers code numbers and history; e) cross-sectional area of the centre of the test specimen; f) upper (N 1 ) and lower (N 2 ) load levels used in the testing cycle; g) mean strain; h) secant modulu
37、s of elasticity of each test specimen; i) arithmetic mean secant modulus of elasticity; j) type of test machine used; k) type of strain gauge or compressometer used.BS6319-6:1984 BSI 07-1999 Publications referred to BS410, Specification for test sieves. BS812, Methods for sampling and testing of min
38、eral aggregates, sands and fillers. BS812-1, Sampling, size, shape and classification. BS1610, Methods for the load verification of testing machines. BS1881, Testing concrete. BS1881-115, Specification for compression testing machines for concrete. BS4408, Recommendations for non-destructive methods
39、 of test for concrete. BS4408-2, Strain gauges for concrete investigations. BS6319, Testing of resin compositions for use in construction. BS6319-1, Method for preparation of test specimens. BS6319-6: 1984 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent
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