1、Designation:D562413Standard Practice forDetermining the Transverse-Aggregate Spread Rate forSurface Treatment Applications1This standard is issued under the fixed designation D5624;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the
2、year of last revision.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 details the procedure for determining theaggregate spread rates in approximately 0.33-m transverseinc
3、rements.1.2 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.3 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
4、appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2C136 Test Method for Sieve Analysis of Fine and CoarseAggregatesC566 Test Method for Total Evaporable Moisture Content ofAggregate by DryingE898
5、Test Method of Testing Top-Loading,Direct-ReadingLaboratory Scales and Balances3.Summary of Practice3.1 The transverse-aggregate spread rate is determined bythe use of a series of pads laid side by side width-wise acrossthe pavement.The aggregate spreader is then allowed toproceed across the mats wi
6、th the gates open allowing theaggregate to drop onto the mats.Aggregate collected on eachof the mats is removed and weighed.The transverse-aggregatedistribution then is calculated,and the aggregate spreaderadjusted if desired.Moisture content and aggregate gradationcan be determined from the collect
7、ed material.4.Significance and Use4.1 This practice can be used to calibrate aggregate spread-ers and verify the uniformity of distribution transversely priorto construction of the surface treatment by determining theaverage quantity of aggregate spread per unit area.4.2 This practice can be useful
8、for quality control duringconstruction to monitor the spread rate.4.3 The samples obtained during construction can also beused for the determination of moisture content and gradingwhen such information is required.5.Apparatus5.1 BalanceA balance(or scale)of sufficient capacity tohandle the mass of t
9、he aggregate shall be provided.Thisbalance(or scale)shall be readable and accurate to 1 g if onlythe transverse spread rate is being determined;an accuracy of0.1 g is needed if moisture content is being determined.Allbalances,or scales,shall meet the requirement set forth inMethod E898 for top loadi
10、ng,direct-reading laboratory scalesand balances.5.2 ContainersContainers,sufficient in number for thenumber of samples to be taken,and of a sufficient size to holdthe contents of one mat.If moisture content is to bedetermined,then the container shall be sealable.5.3 MatsIndividual flat mats with a k
11、nown surface area.The material should be able to stay in place as the aggregatespreader moves over the mats in the wheel paths.The materialshould also have sufficient texture so the aggregate does notroll appreciably when dropped from the aggregate spreader(Note 1).NOTE1Rubber floor mats and roofing
12、 felt materials of knowndimensions have been used successfully.5.4 OvenThe oven shall be a forced air type oven capableof maintaining a uniform temperature of 110 6 5C.PROCEDURES6.Determination of Transverse Spread Rate6.1 Place the mats side by side width-wise on the pavementwith the grooves perpen
13、dicular to the centerline(Fig.1).Thispractice can be used to evaluate the uniformity of the aggregate1This practice is under the jurisdiction of ASTM Committee D04 on Road andPaving Materials and is the direct responsibility of Subcommittee D04.24 onBituminous Surface Treatments.Current edition appr
14、oved Dec.15,2013.Published January 2014.Originallyapproved in 1994.Last previous edition approved in 2007 as D5624 02(2007).DOI:10.1520/D5624-13.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volu
15、me information,refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 spread rate across the entire width of spreader box,or limitedto key areas of interest such as within the wheel
16、 paths.Adjustments to the transverse aggregate spread rate are moreeasily made when the width of the individual mats are matchedto the width of the individual gates on the aggregate spreader.NOTE2Gate widths may vary across the aggregate speader box andby equipment manufacturer.6.2 Drive the aggregate spreader over the pads with thegates open to allow the aggregate to fall onto the mats.Theaggregate spreader should be operating at the desired speed andaggregate spread rate before reaching the ma
