1、DEUTSCHE NORM Mav 1998 I DIN Tests for geometrical properties of aggregates Part 7: Determination of shell content - Percentage of shells in - I EN 933-7 coarse aggregates English version of DIN EN 933-7 ICs 91.1 00.20 Descriptors: Aggregates, testing, shell content. Prfverfahren fr geometrische Eig
2、enschaften von Gesteins- krnungen - Teil 7: Bestimmung des Muschelschalengehaltes - Prozentsatz von Muschelschalen in groben Gesteinskrnungen European Standard EN 933-7 : 1998 has the status of a DIN Standard. A comma is used as the decimal marker. National foreword This standard has been prepared b
3、y CEN/TC 154. The responsible German body involved in its preparation was the Normenausschu Materialprfung (Mate- rials Testing Standards Committee), Technical Committee Prfung von Naturstein und Gesteinskrnungen. DIN IS0 331 0-1 and DIN IS0 331 0-2 are the standards corresponding to International S
4、tandards IS0 331 0-1 and IS0 331 0-2, respectively, referred to in clause 2 of the EN. EN comprises 8 pages. No pari of this standard may be reproduced without the prior permission of V Deutsches Institut fr Nonung e. V., Berlin. Luth Verlag GmbH, D-10772 Berlin, has the exclusive right of sale for
5、German Standards (DIN-Normen). Ref. No. DIN EN 933-7 : 1998-0 English pricegroup 07 Sales No. 1107 10.98 EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 933-7 March 1998 ICs 91.1 00.20 Descriptors: Aggregates, testing, shell content. English version Tests for geometrical properties of aggregate
6、s Part 7: Determination of shell content - Percentage of shells in coarse aggregates Essais pour dterminer les proprits gomtriques des granulats - Partie 7: Dtermination de la teneur en lments coquilliers - Pourcentage des coquilles dans les gravillons Prfverahren fr geometrische Eigenschaften von G
7、esteins- krnungen - Teil 7: Bestimmung des Muschelschalengehaltes - Prozent- satz von Muschelschalen in groben Gesteinskrnungen This European Standard was approved by CEN on 1998-02-1 5. CEN members are bound to comply with the CENKENELEC Internal Regulations which stipulate the conditions for givin
8、g this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national stand- ards may be obtained on application to the Central Secretariat or to any CEN member. The European Standards exist in three official versi
9、ons (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, t
10、he Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, the Netherlands, Norway, Portugal, Spain, Sweden, Switzerland, and the United Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central S
11、ecretariat: rue de Stassart 36, 8-1050 Brussels O 1998. CEN - All rights of exploitation in any form and by any means reserved worldwide for CEN national members. Ref. No. EN 933-7 : 1998 E Page 2 EN 933-7 : 1998 Contents Page 2 3 3 3 4 4 4 5 6 7 8 Foreword 2 Normative references 3 Definitions 4 Pri
12、nciple 5 Apparatus 6 Preparation of test portion 7 Procedure 8 9 Test report Annex A (informative) Example of test data sheet 1 scope Calculation and expression of results Foreword This European Standard has been prepared by Technical Committee CEN/TC 154 “Aggregates”, the secretariat of which is he
13、ld by BSI. This standard forms part of a series of tests for geometrical properties of aggregates. Test methods for other properties of aggregates will be covered by Parts of the following European Stanards: EN 932 Tests for general properties of aggregates EN 1097 Tests for mechanical and physical
14、properties of aggregates EN 1367 Tests for thermal and weathering properties of aggregates EN 1744 Tests for chemical properties of aggregates A European Standard “Tests for filler aggregate used in bituminous mixtures” is in course of preparation. The other parts of EN 933 will be: Part 1: Part 2:
15、Part 3: Part 4: Part 5: Part 6: Part 8: Part 9: Part 10: Determination of particle size distribution - Sieving method Determination of particle size distribution - Test sieves, nominal size of apertures Determination of particle shape - Flaluness index Determination of particle shape - Shape index A
16、ssessment of surface characteristics - Percentage of crushed and broken surfaces in coarse aggregates Assessment of surface characteristics - Flow coefficient of coarse aggregates Assessment of fines - Sand equivalent test Assessment of fines - Methylene blue test Assessment of fines - Grading of fi
17、llers (air jet sieving) 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 1998, and conflicting national standards shall be withdrawn at the latest by December 1999. According to the CENKE
18、NELEC Internai Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, S
19、witzerland and the United Kingdom. Page 3 EN 933-7 : 1998 1 scope This European Standard specifies a method for the determination of shell content of coarse aggregates. It applies to gravel or mixed aggregate containing gravel. The test method specified in this part of this European Standard is appl
20、icable to particle size fractions dJDi where Di L 63 mm and di 2 4 mm. NOTE: For aggregate sizes with D 63 mm and/or d 2 d shall first be separated into particle size fractions di/Di where Di I2 di. 7 Procedure 7.1 Test portions where D I2 d Spread the particles of the test portion on a flat surface
21、 and separate out the shells and shell fragments by hand. Weigh the shells and shell fragments and record their mass M2. 7.2 Test portion where D 2 d Separate the test portion into particle size fractions Di where Di 5 2 di by sieving in accordance with EN 933-1. Page 6 EN 933-7 : 1998 Record the ma
22、ss of each particle size fraction as Mi and calculate and record the percentage by mass of each particle size fractions d,/Di to the test portion mass M, as V,. Discard any size fraction dilDi which comprises less than 10 % of MI. NOTE 1: Any remaining size fraction di/Di which contains less than 10
23、0 particles should, if required, be recorded in the test report. NOTE 2: Size fractions di/Di which contain an excessive number of particles can be further reduced in accordance with prEN 932-2. NOTE 3: Size fractions can be further reduced if they consist of significantly more than 200 particles. R
24、ecord the mass of particles to be tested in each remaining particle size fraction di/Dl as Mli and sort them as specified in 7.1. Record the mass of shell and shell fragments in each of these size fractions d,/D, as Mli. 8 Caicuiation and expression of results 8.1 Test portions where D 12d Calculate
25、 the shell content SC in accordance with the following equation: sc = (M*/M,) x loo where: Ml M2 is the mass of the test portion, in grams; is the mass of the shells and shell fragments, in grams. Record the value of SC to the nearest whole number. 8.2 Test portions where D 2 d 8.2.1 Size fractions
26、not reduced If no size fractions have been reduced calculate the shell content in accordance with the following equation: CM21 =fI I sc = - x 100 where: CMli CMZi is the sum of the masses in the size fractions tested, in grams. is the sum of the masses of shells and shell fragments in each of the si
27、ze fractions tested, in grams. Record the value of SC to the nearest whole number. Page 7 EN 933-7 : 1998 8.2.2 Reduced size fractions If any size fractions have been reduced calculate the percentages by mass of shells and shell fragments in each particle size fraction and record as SC. Calculate th
28、e weighted mean percentage value of the shells and shell fragments in accordance with the following equation: C(V, SCI) cv, sc = where: is the percentage by mass of particle size fraction i in the sample tested; is the percentage by mass of sheiis and shell fragments in particle size fraction i. SCi
29、 Record the weighted mean percentage of shells and shell fragments to the nearest whole number 9 Test report 9.1 Required data The test report shall include the following information: a) reference to this European Standard; b) identification of the sample; c) identification of the laboratory; d) sam
30、ple reception date. e) shell content SC, to the nearest whole number; f) where applicable, the weighted mean percentage. 9.2 Optional data The test report may include the information: a) name and location of the sample source; b) description of the material and of the sample reduction procedure; c)
31、visual description of shells (e.g., hollow or flat); d) mass of sample Mo; e) mass of test portion M,; Q mass of shells and fragments M2; g) any size fraction consisting of less than 100 particles; h) sampling certificate, if available; i) date of test. Page 8 EN 933-7 : 1998 EN 933-7 Identification
32、 of the sample: Annex A (informative) Example of a test data sheet Laboratory: Date: Operator: Mass M, Mass M2 g g Particle size fraction di/Di where Di I2 di m Shell content SC (to the nearest whole number) % = (M2/M,) x 100 NOTE: When a particle size fraction di/Di has been reduced, an appropriate test data sheet should be used and the weighted mean values calculated as specified in 8.2.
