1、Designation: D6998 11Standard Practice forEvaluating Aggregate Coating using Emulsified Asphalts1This standard is issued under the fixed designation D6998; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision.
2、A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This practice covers those emulsified asphalts intendedfor use by mixing with aggregate. It is not applicable torapid-setting types o
3、r diluted materials used for tack coats,priming, or mulch treatments.1.2 The values stated in SI are to be regarded as standard.No other units of measurement are included in this standard.1.3 This practice does not purport to address all of thesafety concerns, if any, associated with its use. It is
4、theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2E11 Specification for Woven Wire Test Sieve Cloth and TestSieves3. Sample Conditioni
5、ng for Testing3.1 All emulsified asphalts shall be properly stirred toachieve homogeneity.3.2 All emulsified asphalts with viscosity testing require-ments of 50C shall be conditioned to 50 6 3C in a samplecontainer in a water bath or oven. The container should bevented to relieve pressure. After the
6、 sample reaches 50 6 3C,stir the sample to achieve homogeneity.3.3 Emulsified asphalts with viscosity testing requirementsof 25C shall be conditioned to 25 6 3C in a sample containerto achieve homogeneity. the sample reaches 25 6 3C, stir thesample to achieve homogeneity.NOTE 1Emulsified asphalts wi
7、th viscosity testing requirements of25C may be heated and stirred as specified in 3.2, if necessary. In theevent the 3.2 method is used, the sample should be cooled to 25 6 3C.4. Significance and Use4.1 The intent of this practice is to ensure that a givenmixing grade emulsified asphalt is stable en
8、ough and otherwisepossesses the ability to mix with a reference stone for theprescribed time, and coat it uniformly and thoroughly.5. Apparatus and Material5.1 SievesStandard 19.0-mm and 6.3-mm sieves con-forming to Specification E11.5.2 SpatulaA steel spatula or its equivalent, having ablade approx
9、imately 200 mm in length.5.3 Mixing ContainerA container of approximately 1 Lcapacity (for example, round bottom iron dish, kitchen sauce-pan, pie tin, stainless steel bowl).5.4 StoneA supply of reference stone (hard limestone,trap rock, or other type) which has been washed with water anddried befor
10、e using. All stone shall pass through the standard19.0-mm sieve and not more than 5 % shall pass through the6.3-mm sieve.NOTE 2Each laboratory should select its own reference stone supply,the source of which is not apt to change; this is to obviate rapid changesin the character of reference stone us
11、ed in any one laboratory, since theextent of coating may be aggregate dependent.5.5 Balance, capable of weighing 1000 g to within 6 0.1 g.6. Procedure6.1 Weigh 465.0 6 1.0 g of stone into the metal pan.6.2 Add 35.0 6 0.1 g of the emulsified asphalt to the stonein the pan, and mix vigorously with the
12、 spatula for 3 min.NOTE 3An equivalent ratio of 93% stone and 7% emulsified asphaltmay be used.7. Report7.1 Report whether or not there is appreciable separation ofthe asphaltic base from the water of the emulsified asphalt, andwhether or not the stone is uniformly and thoroughly coatedwith the emul
13、sified asphalt.8. Keywords8.1 asphalt; asphalt emulsion; cationic emulsified asphalt;coating; emulsified asphalt1This practice is under the jurisdiction of ASTM Committee D04 on Road andPaving Materials and is the direct responsibility of Subcommittee D04.42 onEmulsified Asphalt Test.Current edition
14、 approved July 1, 2011. Published August 2011. Originallyapproved 2004. Last previous edition published 2004 as D699804. DOI: 10.1520/D6998-11.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards vo
15、lume information, refer to the standards Document Summary page onthe ASTM website.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.ASTM International takes no position respecting the validity of any patent rights asserted in connectio
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18、eration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Bar
19、r Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org). Permission rights to photocopy the standard may also be secured from the ASTM website (www.astm.org/COPYRIGHT/).D6998 112
