ASTM D61-1975(2004) Standard Test Method for Softening Point of Pitches (Cube-in-Water Method)《硬沥青的软化点的试验方法(水中方块试验法)》.pdf
《ASTM D61-1975(2004) Standard Test Method for Softening Point of Pitches (Cube-in-Water Method)《硬沥青的软化点的试验方法(水中方块试验法)》.pdf》由会员分享,可在线阅读,更多相关《ASTM D61-1975(2004) Standard Test Method for Softening Point of Pitches (Cube-in-Water Method)《硬沥青的软化点的试验方法(水中方块试验法)》.pdf(3页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: D 61 75 (Reapproved 2004)An American National StandardStandard Test Method forSoftening Point of Pitches (Cube-in-Water Method)1This standard is issued under the fixed designation D 61; the number immediately following the designation indicates the year of originaladoption or, in the ca
2、se of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.Asuperscriptepsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This test method covers the determination of the soft-ening point of pitches below 176F (80C)
3、. Pitches of highersoftening point should be tested by Test Method D 2319 or TestMethod D 3104.1.2 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety and health pr
4、actices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2D 140 Practice for Sampling Bituminous MaterialsD 2319 Test Method for Softening Point of Pitch (Cube-in-Air Method)D 3104 Test Method for Softening Point of Pitches (MettlerSof
5、tening Point Method)E1 Specification for ASTM Thermometers3. Summary of Test Method3.1 Two cubes of pitch, supported on wire hooks, are heatedat a controlled rate in water in a glass container. The softeningpoint is defined as the mean of the temperatures at which thecubes sag downwards a distance o
6、f 25 mm.4. Significance and Use4.1 Pitch does not go through a solid-liquid phase changewhen heated, and therefore it does not have a true meltingpoint. As the temperature rises, pitch softens and becomes lessviscous. The softening point is arbitrarily defined and shall beestablished by a closely co
7、ntrolled method which shall becarefully followed if test results are to be reproducible.4.2 This test is useful in determining the consistency ofpitch as one element in establishing the uniformity of ship-ments or sources of supply.5. Apparatus5.1 MoldA mold suitable for forming two12-in. (12.7-mm)
8、cubes of pitch, having cylindrical core pins 12 gage (2.05mm) in diameter located in the base plate of the assembly toproduce accurately centered suspension holes in the cubes.(See Fig. 1.)5.2 HooksTwo L-shaped hooks, made of 12-gage (2.05-mm) copper wire. The foot of the hook shall be 1-in. (25-mm)
9、long and at a right angle to the upright portion for insertion intothe center hole of the pitch cube.5.3 ContainerA glass vessel that can be heated, not lessthan 85 mm in diameter and 105 mm deep. (A standard600-mL low-form beaker meets these requirements).5.4 ThermometerAn ASTM Low Softening Point
10、Ther-mometer having a range from 30 to 180F (2 to 80C) andconforming to the requirements for Thermometer 15F (15C) asdescribed in Specification E1.5.5 Heat Source:5.5.1 Electric HeaterA hot plate or immersion heaterprovided with a variable transformer or other device suitablefor regulating the tempe
11、rature of the heating element.5.5.2 Gas HeaterA bunsen-type burner, fitted with achimney.6. Sampling6.1 Samples from shipments shall be taken in accordancewith Practice D 140 and shall be free of foreign substances.Thoroughly mix the sample before removing a representativeportion for the determinati
12、on or for dehydration.6.2 If the presence of water is indicated by surface foam onheating, maintain the sample at a temperature of about 260F(125C) in an open container until the surface is free of foam.Take care not to overheat, and remove from the heat source assoon as the foam has subsided.7. Tes
13、t Specimens7.1 Coat the inner surfaces and core pins of the mold verylightly with silicone oil or silicone grease. Form the pitch intotruly shaped cubes either by pressing (7.2) or by pouring (7.4),the latter being preceded by melting (7.3) if the sample is solid.Use an excess of pitch in either cas
14、e. Cool until firm andremove the surplus material by drawing the heated blade of aputty knife or spatula across the surface of the mold so that thecubes are pressed into the cavities. Then open the mold and1This test method is under the jurisdiction of ASTM Committee D02 onPetroleum Products and Lub
15、ricants and is the direct responsibility of SubcommitteeD02.05 on Properties of Fuels, Petroleum Coke and Carbon Material.Current edition approved Nov. 1, 2004. Published November 2004. Originallyapproved in 1919. Last previous edition approved in 1999 as D 61 75 (1999).2For referenced ASTM standard
16、s, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 1
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