1、Designation: D 6998 04Standard Practice forEvaluating Aggregate Coating using Emulsified Asphalts1This standard is issued under the fixed designation D 6998; 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 (e) 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 type
3、s or diluted materials used for tack coats,priming, or mulch treatments.1.2 This practice 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 practices and determine t
4、he applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2E 11 Specification for Wire Cloth and Sieves for TestingPurposes3. Sample Conditioning for Testing3.1 All emulsified asphalts shall be properly stirred toachieve homogeneity.3.2 All emulsified asphalt
5、s with viscosity testing require-ments of 50C shall be heated to 50 6 3C in the originalsample container in a water bath or oven. The container shouldbe vented to relieve pressure. After the sample reaches 50 63C, stir the sample to achieve homogeneity.3.3 Emulsified asphalts with viscosity testing
6、requirementsof 25C should be mixed or stirred at 25 6 3C in the originalsample container to achieve homogeneity.NOTE 1Emulsified asphalts with 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 co
7、oled 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 enough and otherwisepossesses the ability to mix with a reference stone for theprescribed time, and coat it uniformly and thoroughly.5. Apparatus and Material5.1
8、SievesStandard 19.0-mm and 6.3-mm sieves con-forming to Specification E 11.5.2 SpatulaA steel spatula or its equivalent, having ablade approximately 200 mm in length.5.3 DishA round-bottom iron dish or a kitchen saucepan,of approximately 1 L capacity.5.4 StoneA supply of reference stone (hard limest
9、one,trap rock, or other type) which has been washed with water anddried before 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 c
10、hange; this is to obviate rapid changesin the character of reference stone used 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 0.1 g of stone into the metal pan.6.2 Add 35.0 6 0.1 g
11、of the emulsified asphalt to the stonein the pan, and mix vigorously with the spatula for 3 min.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 emu
12、lsified 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 Tests.Current editi
13、on approved Aug. 1, 2004. Published August 2004.2For referenced ASTM standards, 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 AS
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17、hat 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 Barr 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).D6998042
