BS-63-2-1987.pdf

BRITISH STANDARD BS 63-2:1987 Road aggregates Part 2: Specification for single-sized aggregate for surface dressing UDC 625.07 Licensed Copy: London South Bank University, London South Bank University, Thu Dec 07 02:36:28 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 63-2:1987 This British Standard, having been prepared under the direction of the Road Engineering Standards Committee, was published under the authority of the Board of BSI and comes into effect on 30 October 1987 © BSI 12-1998 First published as BS 63-2:1971 First revision as BS 63-2, incorporating BS 1984:1967, October 1987 The following BSI references relate to the work on this standard: Committee reference RDB/1 Draft for comment 85/13854 DC ISBN 0 580 15674 5 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Road Engineering Standards Committee (RDB/-) to Technical Committee RDB/1, upon which the following bodies were represented: British Aggregate Construction Materials Industries British Tar Industry Association County Surveyors Society Department of Transport (Highways) Federation of Manufacturers of Construction Equipment and Cranes Greater London Council Institution of Highways and Transportation Natural Environment Research Council (Institute of Geological Science) Road Emulsion Association Ltd. Road Surface Dressing Association Sand and Gravel Association Limited Society of Chemical Industry Amendments issued since publication Amd. No.Date of issueComments Licensed Copy: London South Bank University, London South Bank University, Thu Dec 07 02:36:28 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 63-2:1987 © BSI 12-1998i Contents Page Committees responsibleInside front cover Forewordii 1Scope1 2Definitions1 3Specified size1 4Sampling and testing1 5Grading and flakiness index limits2 6Strength2 Table 1 Specified sizes for given nominal sizes1 Table 2 Grading limits, specified size and maximum flakiness index for surface dressing aggregates1 Table 3 Grading limits, specified size and maximum flakiness index for surface dressing aggregates for lightly trafficked roads2 Publications referred toInside back cover Licensed Copy: London South Bank University, London South Bank University, Thu Dec 07 02:36:28 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 63-2:1987 ii © BSI 12-1998 Foreword This British Standard has been prepared under the authority of the Road Engineering Standards Committee and is a revision as one standard in two Parts of the two standards BS 63-2:19711) and BS 1984:19672) both of which are now withdrawn. For ease of use the number BS 63 is being retained. BS 63-1:19511) is withdrawn. The two Parts are: Part 1: Specification for single-sized aggregate for general purposes; Part 2: Specification for single-sized aggregate for surface dressing. Particle size distribution is presented as a continuous grading with specified limits on percentages of material passing selected sieve sizes in order to unify the specification of aggregates with other British Standards, e.g. BS 594 and BS 4987. Requirements for aggregate soundness and the determination of the clay content of fine aggregates are not included in this revision because suitable test methods are not available, though the sedimentation test described in BS 812-1 may offer some guidance in terms of particle size distribution. Reference should be made to BS 812-101 for general guidance on testing aggregates, precision of test methods and variance arising from sampling errors. For lightly trafficked roads some authorities may consider aggregates in accordance with BS 63-1 to be adequate for use as surface dressing; production of surface dressing aggregates will usually involve washing of the aggregate after screening. A British Standard 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. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages 1 and 2, 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 amendment table on the inside front cover. 1) BS 63 Single-sized roadstone and chippings BS 63-1:1951 Imperial units BS 63-2:1971 Metric units 2) BS 1984:1967 Gravel aggregates for surface treatment (including surface dressings) on roads. Licensed Copy: London South Bank University, London South Bank University, Thu Dec 07 02:36:28 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 63-2:1987 © BSI 12-19981 1 Scope This Part of BS 63 specifies grading, flakiness index and strength for nominally single-sized aggregates, i.e. aggregates containing a major proportion of single-sized particles, for use in surface dressing. NOTEThe titles of the publications referred to in this standard are listed on the inside back page. 2 Definitions For the purposes of this Part of BS 63 the following definitions apply. 2.1 specified size the single size which forms the major proportion of the single-sized aggregate NOTESee clause 3. 2.2 nominal size the name given to a particular size of aggregate NOTE 1Usually this is the smallest size of test sieve in accordance with BS 410 through which at least 85 % of the aggregate passes, but where the appropriate test sieve size is not a whole number the nominal size is given as the whole number nearest to that size of test sieve. NOTE 2See Table 1. 3 Specified size 3.1 The specified sizes for given nominal sizes shall be as given in Table 1. Table 1 Specified sizes for given nominal sizes 3.2 The percentage aggregate of specified size shall be not less than that given in Table 2 b) and Table 3 b). Table 2 Grading limits, specified size and maximum flakiness index for surface dressing aggregates 4 Sampling and testing 4.1 Sampling shall be carried out in accordance with the methods specified in BS 812-102. NOTEIt is recommended that sampling be carried out as soon as possible after delivery because of the risk of contamination to aggregates when stockpiled. 4.2 The grading of the aggregate shall be determined in accordance with BS 812-103 using the washing and sieving method. 4.3 The flakiness index of the nominal size aggregate shall be determined in accordance with BS 812-105.1. 4.4 The 10 % fines value of the aggregate shall be determined in accordance with BS 812-3. Nominal sizeSpecified size Passing BS test sieve Retained on BS test sieve mmmmmm 202014 141410 10106.3 66.33.35 a) Grading limits BS test sieveNominal size of aggregates 20 mm14 mm10 mm6 mm Percentage by mass passing BS test sieve 28 mm100 20 mm85 to 100 100 14 mm0 to 3585 to 100 100 10 mm0 to 70 to 3585 to 100 100 6.3 mm0 to 70 to 3585 to 100 5 mm0 to 10 3.35 mm 0 to 35 2.36 mm 0 to 20 to 20 to 20 to 10 600 µm0 to 2 75 µm0 to 10 to 10 to 10 to 1 b) Specified size Minimum percentage by mass retained on BS test sieve (see clause 3) Specified size 65656565 c) Maximum flakiness index Maximum flakiness index 252525 Licensed Copy: London South Bank University, London South Bank University, Thu Dec 07 02:36:28 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 63-2:1987 2 © BSI 12-1998 5 Grading and flakiness index limits 5.1 Grading and flakiness index of surface dressing aggregates (but see 5.2) shall be within the limits given in Table 2. 5.2 Grading and flakiness index of surface dressing aggregates for lightly trafficked roads shall be within the limits given in Table 3. Table 3 Grading limits, specified size and maximum flakiness index for surface dressing aggregates for lightly trafficked roads 6 Strength The resistance to crushing of the aggregate expressed as a 10 % fines value shall not be less than 160 kN, except in the case of blast furnace slag aggregate which shall not be less than 85 kN. a) Grading limits BS test sieveNominal size of aggregate 20 mm14 mm10 mm6 mm Percentage by mass passing BS test sieve 28 mm100 20 mm85 to 100 100 14 mm0 to 4085 to 100 100 10 mm0 to 70 to 4085 to 100 100 6.3 mm0 to 70 to 3585 to 100 5.0 mm0 to 10 3.35 mm 0 to 35 2.36mm 0 to 30 to 30 to 30 to 10 600 µm0 to 2 75 µm0 to 20 to 20 to 20 to 2 b) Specified size Minimum percentage by mass retained on BS test sieve (see clause 3) Specified size 60606565 c) Maximum flakiness index Maximum flakiness index 353535 Licensed Copy: London South Bank University, London South Bank University, Thu Dec 07 02:36:28 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 63-2:1987 © BSI 12-1998 Publications referred to BS 63, Road aggregates3). BS 63-1, Specification for single sized aggregate for general purposes. BS 410, Specification for test sieves. BS 594, Hot rolled asphalt for roads and other paved areas3). BS 812, Testing aggregates. BS 812-1, Methods for determination of particle size and shape3). BS 812-3, Methods for determination of mechanical properties. BS 812-101, Guide to sampling and testing aggregates3). BS 812-102, Methods for sampling. BS 812-103, Methods for determination of particle size distribution. BS 812-105, Methods for determination of particle shape. BS 812-105.1, Flakiness index. BS 4987, Coated macadam for roads and other paved areas3). 3) Referred to in the foreword only. 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