1、UDC 665.775.4:625.855 :620.178.6: 536.4 DEUTSCHE NORM Determination of dimensional stability when heated (Nssel deformation index) November 1990 1996 Part 17 I DIN Testing of asphalt In keeping with current practice in standards published by the International Organization for Standardization (ISO),
2、a comma has been used throughout as the decimal marker. 1 Scope and field of application The method specified in this standard serves to determine the Nssel deformation index of hot-applied bituminous sealing compounds and similar compounds, the index being a meas- ure of their dimensional stability
3、 on heating. lhe method is also applicable to compounds containing road tar pitch. 2 Concept Given a spherical end of a specimen prior to testing, the Ns- sel deformation index is the ratio of its diameter to its height after it has been stored at 45 OC for a given period. 3 Designation Designation
4、of the method of determining the dimensional stability of bituminous sealing compounds and similar com- pounds on heating (17 A 2): Test DIN 1996- 17 A 2 4 Apparatus and reagents 4.1 specimen preparation: a) DIN 12 907 - 100 casserole; b) mould release agent (e.g. 1 : 1 mixture of glycerol and dex-
5、trin); c) mould as specified in DIN 1996 Part 18. lhe following apparatus and reagents shall be used for 4.2 The following apparatus shall be used for testing: a) water bath containing both water and ice (ice water); b) oven as specified in DIN 50 O11 Part 12), fitted with an internal door with glas
6、s window and DIN 12 775 - E 0,2/0/100 thermometer; c) glass plate, approximately 200 mm X 300 mm X 3 mm in size; d) DIN 862 caliper gauge. 5 Specimen preparation 5.1 Sampling and specimen preparation shall be carried out as specified in DIN 1996 Parts 2 and 3, the quantity taken being sufficient to
7、permit two specimen balls, each about 47 mm in diameter, to be produced. 1) See also DIN 12 880 Part 1. 5.2 A thin film of mould release agent shall be applied to the inner surfaces of both halves of a mould, and the mould assembled. Next, the sample material shall be heated in a cas- serole to work
8、ing temperature. Once this temperature has been reached, the mould shall be completely filled with the liquid material, care being taken to prevent air being en- trapped. lhe mould, containing the specimen material, shall be al- lowed to cool at ambient temperature (18 to 28 OC) until the specimen c
9、an easily be removed. Under running water, at ambient temperature, the specimen shall be shaped with the hands to a sphere, any adhering mould release agent being removed as well. The specimens so prepared shall show no creases or cavities. 6 Procedure 6.1 Immediately after preparation, the specimen
10、 balls shall be stored in ice water for two hours and shall then be dried and placed on a dry glass plate which has previously also been cooled in ice water, the spacing of the specimen balls being 10cm. The glass plate with the specimens shall be placed in the oven with the temperature sensor locat
11、ed exactly between them and at a height equal to half the speci- men height. Throughout the test, the temperature shall be maintained at (45 f 1) “C. Specimens produced from pave- ment sealing compounds shall be heated in the oven for three hours, those produced from concrete or from compounds used
12、to seal rails embedded in road surfaces, for 24 hours. 6.2 After removal from the oven, the glass plate together with the specimens shall be placed in ice water fora minimum of five minutes. Following this, the specimen height and the horizontal diam- eter in at least two directions normal to each o
13、ther shall be measured using a caliper gauge. 7 Evaluation The deformation index shall be calculated for each specimen using the following equation: diameter height Deformation index = , taking the arithmetic mean from the individual measured values as the diameter. If the deformation indices of the
14、 specimens differ from each other by more than the permissible range, azul (cf. clause 9.1), the specifications given in DIN 1996 Part 1 shall apply. Continued on page 2 uth Verlag GmbH. Berlin, has the exclusive right of sale for German Standards (DIN-Normen). DIN 1996 Part 17 Engl. Price group 5 S
15、ales No.0105 11.91 Page 2 DIN 1996 Part 17 8 Expression of result 9.3 Reproducibility limlts Thearithmetic mean from the deformation indicesforthe two specimens shall, with a reference to this standard, be reported as the Nsse1 deformation index, expressed to the nearest 0,l. (different operators, d
16、ifferent apparatus) The reproducibility standard deviation, UR. is 0.3, and the reproducibility limit# Ri equals 2177 OR = Confidence limits for a single test result, x: for a test result expressed as the arithmetic mean,Z,from two results: for a teSi result expressed as the arithmetic mean, %, from
17、 three results: 9 Precision See DIN 1996 Part 1 and DIN 55350 Part 13. 9.1 Permissible range The permissible range, azul, shall be 0,8. 9.2 Repeatability limits (same operator, same apparatus) The repeatability standard deviation, u, is 0,2 and the repeat- ability limit, I, equals 2,77 ur = 0,6. Xfq
18、R1 =X f 196 UR = X i 0,6; +% k qR2 = ? I 1,39 OR = 2 0,4; xfqR3 = % f 1,13 OR = % i 0,3. Standards referred to DIN 862 DIN 1996 Part 1 DIN 1996Part2 DIN 1996 Part3 DIN 1996 Part 18 DIN 12 775 DIN 12 880 Part 1 DIN 12 907 DIN 50011 Part 12 DIN 55 350 Part 13 Caliper gauges: requirements and testing T
19、esting of bituminous binders for use in road construction and related purposes: general, survey and evalua- tion of tests Testing of bituminous binders for use in road construction and related purposes; sampling Testing of bituminous materials for use in road construction and related purposes; sampl
20、e preparation Testing of asphalt; Herrmann falling ball test Laboratory glassware; thermometers with 0,l OC, 0,2 OC and 0,5 OC scale intervals Laboratory electrical apparatus; ovens; safety requirements and testing Hard porcelain laboratory ware: casseroles Artificial climates in technical applicati
21、ons; air temperature as a climatological quantity in controlled-atmos- phere test installations Terminology in quality assurance and statistics; concepts relating to the accuracy of test methods and measurement results Other relevant standards and documents DIN 55 946 Part 1 DIN 55 946 Part 2 TLbitF
22、ug 82 Bitumen and coal tar pitch; terminology relating to bitumen Bitumen and coal tar pitch; terminology relating to coal tar pitch Technische Lieferbedingungen fr bituminse Fugenvergumassen*) (Technical delivery conditions for bitu- minous joint sealing compounds) Previous editions DIN 1996: 1929,
23、 11.35, 04.44: DIN 1996 Part 17: 05.66. 09.71, 01.83. Amendments The following amendments have been made to the January 1983 edition: a) the title of this standard has been amended; b) the terminology given in DIN 55 946 Parts 1 and 2 has been taken into account; c) details of specimen preparation h
24、ave been amended. d) the standard has been editorially revised. Explanatory notes This standard has been prepared jointly by Technical Committee 333 Prfung von Asphalt of the Normenausschu Materialprfung (Materials Testing Standards Committee) and the Normenausschu Bauwesen (Building and Civil Engineering Standards Commit- tee) of DIN. International Patent Classification G O1 N 33/42 *) Obtainable from Forschungsgeselischaft fr StraBen- und Verkehrswesen e.V., Postfach 21 O3 60, D-5000 Kln 21.
