1、BS EN1097-5:2008ICS 91.100.15NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBRITISH STANDARDTests for mechanicaland physicalproperties ofaggregatesPart 5: Determination of the watercontent by drying in a ventilated ovenThis British Standard was published under the authority of
2、 the Standards Policy and Strategy Committee on 30 June2009 BSI 2009ISBN 978 0 580 58930 0Amendments/corrigenda issued since publicationDate CommentsBS EN 1097-5:2008National forewordThis British Standard is the UK implementation of EN 1097-5:2008. It supersedes BS EN 1097-5:1999 which is withdrawn.
3、 The UK participation in its preparation was entrusted to TechnicalCommittee B/502/6, Test methods.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication does not purport to include all the necessary provisionsof a contract. Users are respon
4、sible for its correct application. Compliance with a British Standard cannot confer immunityfrom legal obligations.BS EN 1097-5:2008EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 1097-5March 2008ICS 91.100.15 Supersedes EN 1097-5:1999 English VersionTests for mechanical and physical properties of
5、 aggregates -Part 5: Determination of the water content by drying in aventilated ovenEssais pour dterminer les caractristiques mcaniques etphysiques des granulats - Partie 5: Dtermination de lateneur en eau par schage en tuve ventilePrfverfahren fr mechanische und physikalischeEigenschaften von Gest
6、einskrnungen - Teil 5:Bestimmung des Wassergehaltes durch OfentrocknungThis European Standard was approved by CEN on 4 February 2008.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national stan
7、dard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the CEN Management Centre or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other l
8、anguage made by translationunder the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as theofficial versions.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finla
9、nd,France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE
10、 FR NORMUNGManagement Centre: rue de Stassart, 36 B-1050 Brussels 2008 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 1097-5:2008: EBS EN 1097-5:2008EN 1097-5:2008 (E) 2 Contents Page Foreword3 1 Scope 4 2 Normative references 4 3 T
11、erms and definitions .4 4 Principle4 5 Apparatus .5 6 Preparation of test portion5 7 Procedure .6 8 Calculation and expression of results.6 9 Test report.7 Annex A (normative) Variations to the determination of the water content by drying in a ventilated oven for use with lightweight aggregates.8 An
12、nex B (informative) Example of calculation of the water content by drying in a ventilated oven9 Annex C (informative) Precision 10 Bibliography 11 BS EN 1097-5:2008EN 1097-5:2008 (E) 3 Foreword This document (EN 1097-5:2008) has been prepared by Technical Committee CEN/TC 154 “Aggregates”, the secre
13、tariat of which is held by BSI. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by September 2008, and conflicting national standards shall be withdrawn at the latest by September 2008. Attention is
14、drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. This document supersedes EN 1097-5:1999. This Standard forms part of a series of tests for mechanic
15、al and physical properties of aggregates. Test methods for other properties of aggregates are covered by parts of the following European Standards: EN 932, Tests for general properties of aggregates EN 933, Tests for geometrical properties of aggregates EN 1367, Tests for thermal and weathering prop
16、erties of aggregates EN 1744, Tests for chemical properties of aggregates EN 13179, Tests for filler aggregate used in bituminous mixtures The other parts of EN 1097 are: Part 1: Determination of the resistance to wear (micro-Deval) Part 2: Methods for the determination of resistance to fragmentatio
17、n Part 3: Determination of loose bulk density and voids Part 4: Determination of the voids of dry compacted filler Part 6: Determination of particle density and water absorption Part 7: Determination of the particle density of filler - Pyknometer method Part 8: Determination of the polished stone va
18、lue Part 9: Determination of the resistance to wear by abrasion from studded tyres - Nordic test Part 10: Determination of water suction height According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Stan
19、dard: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom.
20、 BS EN 1097-5:2008EN 1097-5:2008 (E) 4 1 Scope This standard describes the reference method used for type testing and in cases of dispute for the determination of the water content of aggregates by drying in a ventilated oven. For other purposes, in particular factory production control, other metho
21、ds may be used provided that an appropriate working relationship with the reference method has been established. 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 referen
22、ces, the latest edition of the referenced document (including any amendments) applies. EN 932-2, Tests for general properties of aggregates - Part 2: Methods for reducing laboratory samples EN 932-5, Tests for general properties of aggregates - Part 5: Common equipment and calibration 3 Terms and de
23、finitions For the purposes of this document, the following terms and definitions apply. 3.1 aggregate size designation of aggregate in terms of lower (d) and upper (D) sieve sizes. This designation accepts the presence of some particles which will be retained on the upper sieve (oversize) and some w
24、hich will pass the lower sieve (undersize) 3.2 test portion sample used as a whole in a single test 3.3 constant mass successive weighings after drying at least 1 h apart not differing by more than 0,1 % NOTE In many cases constant mass can be achieved after a test portion has been dried for a pre-d
25、etermined period in a specified oven at (110 5) C. Test laboratories can determine the time required to achieve constant mass for specific types and sizes of sample dependent upon the drying capacity of the oven used. 4 Principle The oven-drying method provides a measure of the total free water pres
26、ent in a test portion of aggregate. The water can be from the surface of the aggregate and from water accessible pores within the aggregate particles. A test portion is weighed and then placed in a ventilated drying oven at (110 5) C. Successive weighings are used to determine the constant mass of t
27、he dried test portion. At all stages of handling and preparation before the start of the test, the laboratory sample and subsequent test portion are protected from loss or gain of water. The water content is determined as the difference in mass between the wet and the dry mass and is expressed as a
28、percentage of the dry mass of the test portion. A variation on the method for use with lightweight aggregates is specified in Annex A. BS EN 1097-5:2008EN 1097-5:2008 (E) 5 5 Apparatus 5.1 All apparatus, unless otherwise stated, shall conform to the general requirements of EN 932-5. 5.2 Container, l
29、arge enough to store the test portion before testing. The container shall be non-corrodible and closed so as to prevent the loss of water. NOTE 1 The following may be suitable: a) watch glasses with clips; b) petri dishes or tins with lids; c) plastic sacks or bags with suitable closures; d) buckets
30、 with lids. NOTE 2 Long term storage of the test portion in a plastic sack or bag should be avoided. 5.3 Heat resistant stirrer, such as a knife, spatula or a shovel. 5.4 Balance, of suitable capacity, with an accuracy of 0,1 % of the mass of the test portion. 5.5 Ventilated drying oven, thermostati
31、cally controlled to maintain a temperature of (110 5) C. NOTE 1 For temperature sensitive aggregates the drying temperature should be reduced to (40 5) C. NOTE 2 The air movements within the oven induced by a ventilation system should not cause the loss of fine particles. 5.6 Desiccator with desicca
32、nt. As an alternative to the desiccator a closed cabinet containing desiccant may be used for the cooling stage. NOTE Silica gel with colour indicator and calcium chloride are suitable desiccants. 5.7 Tray(s), heat resistant and of sufficient size and number to suit the test portion. NOTE For small
33、test portions, tins and watch glasses can be suitable. 6 Preparation of test portion The laboratory sample shall be reduced as specified in EN 932-2 to produce a test portion. Calculate the minimum mass of the test portion from the value of the upper (D) sieve size, in millimetres (see 3.1) as follo
34、ws: - if D 1,0 mm, the minimum mass (in kilograms) shall be 0,2 D; - if D 8 mm the minimum test portion volume shall be 2,0 l; for D 8 mm the minimum test portion volume shall be 1,0 l. A.4 Cooling Instead of cooling the dried test portion to room temperature, weigh each tray and its contents immedi
35、ately after removing it from the oven. NOTE It can be necessary to protect the balance from the heat of the tray. A cork mat can be suitable. BS EN 1097-5:2008EN 1097-5:2008 (E) 9 Annex B (informative) Example of calculation of the water content by drying in a ventilated oven Table B.1 Determination
36、 of the water content by drying in a ventilated oven (using one tray) 1 Container M2653,34 g 2 Mass of tray + moist test portion M1 + M23 574,4 g 3 Mass of tray + dry test portion Md1 + M23 389,7 g 4 Second weighing of tray and dry test portion Mdi+ M23 388,6 g 5 Difference of weighing data (line 3
37、- line 4) 1,1 g 6 (line 3 - line 4) x 100 (line 3 - line 1) 0,04 % (see note) 7 Mass of water (line 2 - line 4) (M1 + M2) - (M3 + M2) 185,8 g 8 Mass of dry test portion (line 4 - line 1) M32 735,2 g 9 Water content (line 7) x 100 (line 8) (mass %) 6,8 % NOTE In line 6, 0,04 % is less than 0,1 %. Add
38、itional weighing is not required and Mdibecomes M3because constant mass has been achieved. BS EN 1097-5:2008EN 1097-5:2008 (E) 10 Annex C (informative) Precision A precision exercise was carried out in 1988 in the United Kingdom involving 13 laboratories. The results of the exercise obtained by appl
39、ying the oven dried method once to a single test portion were: Repeatability r1= 0,11 + 0,079 X where X is the mean value of the water content. Definitions of r1and X are given in EN 932-6. BS EN 1097-5:2008EN 1097-5:2008 (E) 11 Bibliography 1 EN 932-6, Tests for general properties of aggregates - P
40、art 6: Definitions of repeatability and reproducibility 2 ISO 6783:1982, Coarse aggregates for concrete - Determination of particle density and water absorption - Hydrostatic balance method 3 BS 812:Part 109:1990, Testing aggregates - Part 109: Methods for determination of moisture content BS EN1097
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