1、 Designation:D 2398-82 AMERICAN SOCIETY FOR TESTING ANO MATERIALS 1916 Race St.,Philadelphia,Pa.19103 Reprinted from the AJllual Book of ASTM Standards,Copyright ASTM If not listed in the current combined index,will appear in the next edition.Standard Test Method for SOFTENING POINT OF BITUMEN IN ET
2、HYLENE GLYCOL(RING-AND-BALL)This standard is issued under the fixed designation D 2398;the number inuncdia1cly following the designation indicates the ycu of original adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year oflast rcapproval.A superscr
3、ipt epsilon(c)indicate an editorial change sin(;(:the last revision or rcapproval.I.Scope I.I This method covers the determination of lhe softening point of bitumen in the range from 30 to 1 I0C(85 to 230F)using the ring-and-ball apparatus in an ethylene glycol bath.Non 1-For softening points above
4、I 10C(230F)use Method D 36,Test for Softening Point of Bitumen(Ring-and-Ball).2.Applicable Documents 2.1 A STM Standards:C 670 Practice for Preparing Precision State-ments for Test Methods for Construction Materials2 D 36 Test for Softening Point of Bitumen(Ring-and-Ball)092 Test for Flash and Fire
5、Points by Cleve-land Open Cup D 140 Sampling Bituminous Materials E 1 Specification for ASTM Thermometers 3.Summary of Method 3.1 A steel ball of specified mass is placed upon a disk of bitumen contained within a horizontal,shouldered,metal ring of specified dimensions.The assembly is heated in an e
6、th-ylene glycol bath at a uniform,prescribed rate and the softening point taken as the tempera-ture at which the bitumen becomes soft enough to allow the ball,enveloped in the bitumen to fall a distance of 25 mm(l in.).4.Significance 4.1 Bitumens are viscoelastic materials with-out sharply defined m
7、elting points.Bitumens gradually become softer and less viscous as the temperature rises.For this reason,the deter-mination of softening point must be made by an arbitrary and closely defined method if the results obtained are to be reproducible.4.2 Softening point is useful in the classifi-cation o
8、f bitumen and is indicative of the tend-ency of the material to flow at elevated tem-peratures encountered in service.5.Apparatus 5.1 Ring-A brass,shouldered ring con-forming to the dimensions shown in Fig.1(a).5.2 Ball-A steel ball,9.5 mm(%in.)in diameter,and having a mass of 3.50 0.05 g.5.3 Ball-C
9、entering Guide-A guide for cen-tering the ball,constructed of brass and having the general shape and dimensions shown in Fig.1(c).5.4 Ring Holder-The rings shall be sup-ported on a brass ring bolder,Fig.1(b),as shown in the assembly in Fig.I(d).5.4.1 Rings.shall be supported in a horizon-tal positio
10、n with the bottoms of the rings 25 mm(1 in.)above the upper surface of the bottom plate.The distance between the bottom plate and the bottom of the bath shall be 16 3 mm(%in.).5.4.2 The thermometer shall be suspended so that the bottom of the bulb is level with the bottom of the rings and within 13
11、mm(0.5 in.)1 This method is under the jurisdiction of ASTM Com-mittee D-8 on Roofing.Waterproofing Bituminous Materials and is the direct responsibility of Subcommittee 008.03 on Surfacing and Bituminous Materials for Membrane Water-proofing and Builtup Roofing.Current edition approred March 26,1982
12、.Published July 1982.Originally published as D 2398-65.Last previous edition 0 2398.,.76.19.2 Annual Book of ASTM Srantkuds,Parts 13,14,15,and 3 Annual Book o/ASTM Srandard.1,Pan 15.4 Annual Book of ASTM S1andards,Parts 15 and 19.6 Annual Book of ASTM Standards,Pans 25 and44.NOTICE:This standard has
13、 either been superseded and replaced by a new version or discontinued.Contact ASTM International(www.astm.org)for the latest information.of the rings but not touching them.5.5 Brass Pouring Plate-A!la smooth brass plate that has been treated to prevent the bituminous material from adhering to it.NOT
14、E 2-A suitable treatment is to coat the plate just before use with a thin layer of a mixture of glycerin and dexuin.talc,or china clay.5.6 Bath-A glass vessel,capable of being heated,not less than 85 mm in diameter and not less than 120 mm in depth from the bottom of the flare.NOTE 3-An 800-mL,low-f
15、orm Griffin beaker of heat-resistant glass meets this requirement.5.7 Thermomeler-An ASTM Bituminous Material Softening Point Thermometer con-forming to the requirements for Thermometer 113C(-1 to 175C)or 113F(30 to 350F)as prescribed in Specification E l.6.Reagents and Materials 6.1 Bath Liquid-Eth
16、ylene glycol with a boiling point between 195 and 197C(383 and 387F),odts equivalent.Non 4-Cautioo-Ethytene glycol is toxic when taken internally or when inhaled as a vapor.Avoid prolonged or repeated contacts with skin and inha-lation of vapors.Its flash point,in accordance with Method 0 92,is I ISC(240F).7.Sampling 7.1 Sample the material in accordance with Methods D 140.8.Test Specimens 8.1 Heal the sample with care to prevent local overheating,with frequent stirring until it has become suffi
