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1、BRITISH STANDARD BS 7976-1:2002 Pendulum testers Part 1: Specification ICS 19.060 ? BS 7976-1:2002 This British Standard, having been prepared under the direction of the Building Sector Policy and Strategy Committee, was published under the authority of the Standards Policy and Strategy Committee on
2、 20 August 2002 BSI 20 August 2002 The following BSI references relate to the work on this British Standard: Committee reference B/556 Draft for comment DC 00/105213 ISBN 0 580 40144 8 Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technica
3、l Committee B/556, Coordinating pedestrian slip resistance, upon which the following bodies were represented: Association of Consulting Engineers British Ceramic Research Ltd. Department of Transport, Local Government and the Regions represented by the Building Research Establishment Health and Safe
4、ty Executive Health and Safety Laboratory London Transport RAPRA Technology Ltd. SATRA Technology Centre The Tile Association Co-opted members Contributions are also acknowledged from representatives of the following Technical Committees and Subcommittees: B/505/4/P1, Revision of EN 124 and prEN key
5、s B/507, Paving units and kerbs B/517/8, Protection and repair of concrete structures B/543/6, Timber floors, walls and ceilings B/544/6, Screeds and in situ floorings OC/11, Consumer policy committee PRI/60, Resilient floorcoverings Amendments issued since publication Amd. No. DateComments BS 7976-
6、1:2002 BSI 20 August 2002 i Contents Page Forewordii 1Scope1 2Normative references1 3Terms, definitions and abbreviations1 4Features1 5Dimensions and characteristics4 Bibliography5 Figure 1 Typical pendulum tester2 Figure 2 Typical slider assembly3 Table 1 Selected properties of two slider pad mater
7、ials4 BS 7976-1:2002 ii BSI 20 August 2002 Foreword This part of BS 7976 has been prepared by Technical Committee B/556. BS 7976 has been prepared to meet the need for a definitive method of both operation and calibration of the pendulum tester. This part of BS 7976 specifies the features, dimension
8、s and characteristics of the pendulum tester. A method of operation for this pendulum tester is specified in BS 7976-2, and a method of calibration is specified in BS 7976-3. The pendulum tester was originally designed by Percy Sigler in the USA in the 1940s to test pedestrian surfaces. It was adopt
9、ed and further developed in the late 1950s by the then Road Research Laboratory (RRL, now known as the Transport Research Laboratory, TRL). This design has remained basically unchanged to the present day, and other designs based on the same principle are now available. The pendulum tester specified
10、in this part of BS 7976 operates on the principle used in the original RRL apparatus. NOTEDetails of the original instrument are given in Road Research Technical Paper No. 66 1. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its cor
11、rect 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 back cover, pages i and ii, pages 1 to 5 and a back cover. The BSI copyright notice displayed in this document indicates w
12、hen the document was last issued. BS 7976-1:2002 BSI 20 August 2002 1 1 Scope This part of BS 7976 specifies the features, dimensions and characteristics of pendulum testers for use in determining the slip/skid resistance of surfaces. NOTEA method of operation for the pendulum tester is specified in
13、 BS 7976-2, and a method of calibration is specified in BS 7976-3. 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 latest edition of the referenced docu
14、ment (including any amendments) applies. BS 903-A8:1990, Physical testing of rubber Part A8: Method for determination of rebound resilience. BS 903-A26:1995, Physical testing of rubber Part A26: Method for determination of hardness (hardness between 10 IRHD and 100 IRHD). BS 6100-1, Glossary of buil
15、ding and civil engineering terms Part 1: General and miscellaneous. 3 Terms, definitions and abbreviations 3.1 Terms and definitions For the purposes of this part of BS 7976 the terms and definitions given in BS 6100-1 apply. 3.2 Abbreviations For the purposes of this part of BS 7976 the following a
16、bbreviations apply. 4 Features NOTE 1A typical pendulum tester, manufactured to operate on the principles used in the original RRL apparatus, is shown in Figure 1. A typical slider assembly is shown in Figure 2. A pendulum tester shall possess the following features: a) a spring-loaded slider assemb
17、ly mounted on the end of a pendulum arm, such that the sliding edge is (514 6) mm from the axis of rotation; b) a means for setting the column of the instrument vertical; c) a means for raising and lowering the axis of rotation of the pendulum, such that the slider can: 1) swing clear of the test su
18、rface; and 2) be set to slide over a fixed length of the test surface of (126 1) mm; d) a means of holding and releasing the pendulum arm, such that it falls freely from the horizontal position; e) a pointer, balanced about the axis of suspension, indicating the position of the pendulum arm througho
19、ut its forward swing and moving over the circular scale; f) a main scale (C scale) for a sliding length of 126 mm; NOTE 2A typical C scale is shown in Figure 1. g) an optional F scale for a sliding length of 76 mm. Four-Sstandard simulated shoe sole TRLTransport Research Laboratory RRLRoad Research
20、Laboratory TRRLTransport and Road Research Laboratory NOTETransport and Road Research Laboratory (TRRL) and Road Research Laboratory (RRL) are previous names of the Transport Research Laboratory (TRL). TRRL was superseded first by RRL and then by TRL. BS 7976-1:2002 2 BSI 20 August 2002 Key 1C scale
21、 (126 mm sliding length)5Slider assembly9 Vertical screw 2F scale (76 mm sliding length)6Levelling screw10 Release mechanism 3Pointer7Test specimen holder 4Pendulum8Spirit level Figure 1 Typical pendulum tester 23 9 4 10 5 1 7 6 8 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 BS 7976-1:2002 B
22、SI 20 August 2002 3 Key 1Slider pad3Working edge 2Aluminium mounting plate4Worn width Figure 2 Typical slider assembly A A Section A-A 2 1 3 4 BS 7976-1:2002 4 BSI 20 August 2002 5 Dimensions and characteristics 5.1 The combined mass of the pendulum arm and slider assembly shall be (1.50 0.03) kg. T
23、he centre of gravity shall lie on the axis of the arm at a distance of (410 5) mm from the centre of suspension. 5.2 The slider shall consist of a pad of either Four-S rubber or TRL rubber as specified in Table 1, or an alternative to simulate different contact materials. The dimensions of the slide
24、r pad shall be: a) (76.0 1.0) mm wide; b) (25.4 1.0) mm long (in the direction of the swing); c) (6.35 0.50) mm thick. NOTEFour-S rubber and TRL rubber are the two most common types of slider pad material, but others may be used. Table 1 Selected properties of two slider pad materials 5.3 The slider
25、 pad shall be held securely fixed to a rigid backing plate, with a central pivoting axis. 5.4 The mass of the slider assembly (the pad with its backing plate) shall be (35 5) g. 5.5 The slider assembly shall be mounted on the end of the swinging arm so that, when the arm is at the lowest point of it
26、s swing, with the trailing edge of the slider rubber in contact with the test surface, the plane of the slider is angled at (26 3)? to the horizontal. NOTEWith this configuration, the slider assembly can turn about its axis without obstruction to follow unevenness of the surface as the pendulum swin
27、gs. 5.6 The slider assembly shall be spring-loaded against the test surface. 5.7 The nominal static force on the slider assembly in operation shall be 24.5 N in its median position. NOTEThe force used in the calibration procedure is not identical to the force on the slider assembly itself due to the
28、 geometry of the mechanism that provides the force. 5.8 The mass of the pointer shall be not greater than 85 g. The friction in the pointer mechanism shall be adjustable such that, with the pendulum arm swinging freely from a horizontal position, the outward tip of a nominal 300 mm long pointer can
29、be brought to rest on the forward swing of the arm at a point 10 mm below the horizontal. The pointer shall be carried with the pendulum arm on the forward swing only. Type of materialTemperatureProperty ResilienceaHardnessb ?C%IRHD Four-S rubber 521 2 96 22324 2 4028 2 TRL rubber 043 to 49 55 5 105
30、8 to 65 2066 to 73 3071 to 77 4074 to 79 a Lpke rebound test in accordance with BS 903-A8:1990. b International Rubber Hardness Degrees in accordance with BS 903-A26:1995. BS 7976-1:2002 BSI 20 August 2002 5 Bibliography Standards publications BS 7976-2:2002, Pendulum testers Part 2: Method of opera
31、tion. BS 7976-3:2002, Pendulum testers Part 3: Method of calibration. Other publications 1 GILES, C.G., SABEY, BARBARA E., and CARDEW, K.H.F. Development and performance of the portable skid-resistance tester. Road Research Technical Paper No. 66. London: HMSO, 1964.1) 1) Out of print but available
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