1、Designation: D 5624 02 (Reapproved 2007)Standard Test Method forDetermining the Transverse-Aggregate Spread Rate forSurface Treatment Applications1This standard is issued under the fixed designation D 5624; the number immediately following the designation indicates the year oforiginal adoption or, i
2、n the case of revision, the year of last revision. 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 test method details the procedure for determiningthe aggregate spread rates
3、in approximately 0.33-m (1-ft)transverse increments.1.2 The values stated in SI units are to be regarded asstandard. The inch-pound units shown in parentheses are forinformation only.1.3 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is there
4、sponsibility 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:2C 566 Test Method for Total Evaporable Moisture Contentof Aggregate by DryingC 136 Test M
5、ethod for Sieve Analysis of Fine and CoarseAggregatesE 898 Test Method of Testing Top-Loading, Direct-ReadingLaboratory Scales and Balances3. Summary of Test Method3.1 The transverse-aggregate spread rate is determined bythe use of a series of rubber pads laid side by side width-wiseacross the pavem
6、ent. The chip spreader is then allowed toproceed across the rubber mats with the gates open allowingthe aggregate to drop onto the mats. Aggregate collected oneach of the mats is removed and weighed. The transverse-aggregate distribution then is calculated, and the aggregatespreader adjusted if desi
7、red. Moisture content and aggregategradation can be determined from the collected material.4. Significance and Use4.1 The results from this test method are used to calibrateaggregate spreaders and verify the uniformity of distributiontransversely prior to construction of the surface treatment bydete
8、rmining the average quantity of aggregate spread per unitarea.4.2 The test method is useful for quality control duringconstruction to monitor the spread rate.4.3 The samples obtained during construction by this testmethod are useful for determination of moisture content andgrading when such informat
9、ion is required.5. Apparatus5.1 BalanceA balance (or scale) of sufficient capacity tohandle the mass of the aggregate shall be provided. Thisbalance (or scale) shall be readable and accurate to1gifonlythe transverse spread rate is being determined; an accuracy of0.1 g is needed if moisture content i
10、s being determined. Allbalances, or scales, shall meet the requirement set forth inMethod E 898 for top loading, 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 rubbe
11、r mat. If moisture content is to bedetermined, then the container shall be sealable.5.3 Rubber MatsRubber mats shall have grooves ofsufficient depth to prevent aggregate from rolling and slippingwhen the chips are spread. The mats shall be cut in widthsappropriate for the gate openings of the equipm
12、ent beingadjusted. Widths of 0.305 m (1 ft) have been commonly used.The length of the mats shall be a minimum of 0.9144 m (3 ft).Mats shall be cut so that the grooves are perpendicular to the0.9144 m (3 ft) side.NOTE 1Rubber floor mats conforming to these specifications areavailable at local hardwar
13、e stores. Various sizes can be accommodated andboth inchpound and SI units can be handled.1This test method is under the jurisdiction of ASTM Committee D04 on Roadand Paving Materials and is the direct responsibility of Subcommittee D04.24 onBituminous Surface Treatments.Current edition approved Dec
14、. 1, 2007. Published January 2008. Originallyapproved in 1994. Last previous edition approved in 2002 as D 5624 02.2For 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 t
15、he standards Document Summary page onthe ASTM website.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.5.4 OvenThe oven shall be a forced air type oven capableof maintaining a uniform temperature of 110 6 5C (230 69F).PROCEDURES6. Det
16、ermination of Transverse Spread Rate6.1 Place the rubber mats side by side width-wise on thepavement with the grooves perpendicular to the centerline (Fig.1). The number of rubber mats to be used shall be equal to thewidth of aggregate distribution to be monitored.6.2 Tare one container for each mat
17、 to be used. If thecontainer has a lid, tare the container with the lid. Designatethis mass as B.6.3 Drive the aggregate spreader over the pads with thegates open to allow the aggregate to fall onto the rubber mats.Open the gates a minimum of 2.44 m (8 ft) before reaching therubber mats. This allows
18、 time for the transverse-aggregatedistribution to stabilize.6.4 The aggregate spreader shall be operated in the mannerintended for use during construction. Speed and gear settingsshall be representative of anticipated construction use.6.5 After the aggregate spreader has passed over the rubbermats,
19、carefully brush from the edges toward the center of eachrubber mat. Fold each mat lengthwise into a 0.914-m (3-ft)long funnel. Pour the aggregate into a tared, and labeledcontainer. Repeat this procedure until the aggregate from eachof the mats has been placed in individual containers.6.6 Determine
20、the mass of each container of aggregate.Designate this mass as A.7. Moisture Content of Aggregate (Optional)7.1 When the moisture content of the aggregate at the timeof construction is required, obtain the samples using the stepsin 6.1 through 6.6. Place samples for moisture content deter-mination i
21、n a sealed container within 5 min of spreading theaggregate.7.2 Determine the mass of each sealed container of moistaggregate within4hofobtaining the sample. Subtract the massof the container to determine the mass of the moist aggregate.7.3 Determine the moisture content of the aggregate inaccordanc
22、e with Test Method C 566.8. Aggregate Gradation (Optional)8.1 Combine the aggregate from all individual containersinto one container. Mix aggregate through riffle splitter at leasttwice to ensure adequate mixing.8.2 Oven dry to a constant mass.8.3 Perform sieve analysis according to Test Method C 13
23、6.9. Calculation9.1 (SI Units) The aggregate spread rate is determined bythe following:S 5C A 2 B!LW(1)where:A = mass of aggregate and container, g,B = mass of container, g,L = length of mat, mm,S = aggregate spread rate in kg/m2,W = width of mat, mm, andC = 1000, a constant for unit conversion.9.2
24、(Inch-Pound Units) The aggregate spread rate is deter-mined by the following:S 5 CA 2 BLW!9453.6(2)where:A = mass of aggregate and container, g,B = mass of container, g,L = length of mat, ft,S = aggregate spread rate in lbs/yd2,W = width of mat, ft, andC = 0.01984, a constant for inch-pound unit con
25、version.10. Report10.1 Report the following information:10.2 Moisture content of aggregate, if determined,FIG. 1 Layout of MatsD 5624 02 (2007)210.3 Aggregate gradation, if determined, and whether theaggregate was pre-coated, pre-wet or dry, and10.4 The aggregate quantity in kg/m2(lbs/yd2) for each
26、mat.Report results from left to right from the drivers perspective.11. Precision and Bias11.1 Preliminary testing indicates that the reproducibility(within-laboratory) standard deviation for this test is 0.47kg/m2(0.86 lbs/yd2). Because test results are dependent uponindividual pieces of equipment,
27、local requirements for opera-tion of equipment, equipment speed, as well as the fact thatthere is no means of providing a standard material for testing,no estimate of reproducibility (between-laboratory standarddeviation) can be developed. This precision statement is onlyfor the purposes of defining
28、 the ability of one technician tomeasure the transverse spread rate for any given set of testingconditions.NOTE 2Precision estimated from data reported in “Evaluation of 1989Chip Seal Test Sections on US95A Between Wabuska and Yerington,Nevada”, University of Nevada, Reno report to Nevada Department
29、 ofTransportation, June, 1991.11.2 Preliminary testing also suggests that standard devia-tions will vary depending on whether pre-wet or pre-coatedaggregate is used. However, this has not been proven and moreresearch is being done on this subject.11.3 BiasSince there is no accepted reference materia
30、lsuitable for determining the bias no statement on the bias ofthis test method is being made.12. Keywords12.1 aggregate spread; surface treatmentASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of
31、this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five
32、years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical com
33、mittee, 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 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).D 5624 02 (2007)3
