1、Designation: D 5624 02Standard 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, in the case of revi
2、sion, 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 in approximately 0
3、.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 theresponsibility of th
4、e 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:C 566 Test Method for Total Moisture Content of Aggregateby Drying2C 136 Test Method for Sieve Analysis of F
5、ine and CoarseAggregates2E 898 Method of Testing Top Loading, Direct-ReadingLaboratory Scales and Balances33. 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 pavement. The chip spreader is then a
6、llowed 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 desired. Moisture content and aggreg
7、ategradation 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 bydetermining the average quantity of
8、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 information is required.5. Apparatus5.1
9、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 is being determined. Allbalances,
10、 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 rubber mat. If moisture content is to
11、 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 equipment beingadjusted. Widths of 0.3
12、05 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 hardware stores. Various sizes can be a
13、ccommodated andboth inchpound and SI units can be handled.5.4 OvenThe oven shall be a forced air type oven capableof maintaining a uniform temperature of 110 6 5C (230 69F).PROCEDURES6. Determination of Transverse Spread Rate6.1 Place the rubber mats side by side width-wise on thepavement with the g
14、rooves perpendicular to the centerline (Fig.1). The number of rubber mats to be used shall be equal to the1This 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 edit
15、ion approved Feb. 10, 2002. Published April 2002. Originallypublished as D 562494. Last previous edition D 562400.2Annual Book of ASTM Standards, Vol 04.02.3Annual Book of ASTM Standards, Vol 14.02.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, U
16、nited States.width of aggregate distribution to be monitored.6.2 Tare one container for each mat 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 r
17、ubber mats.Open the gates a minimum of 2.44 m (8 ft) before reaching therubber mats. This allows 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 o
18、f anticipated construction use.6.5 After the aggregate spreader has passed over the rubbermats, 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
19、until the aggregate from eachof the mats has been placed in individual containers.6.6 Determine 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 th
20、e samples using the stepsin 6.1 through 6.6. Place samples for moisture content deter-mination in 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
21、 the mass of the moist aggregate.7.3 Determine the moisture content of the aggregate inaccordance 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
22、 mixing.8.2 Oven dry to a constant mass.8.3 Perform sieve analysis according to Test Method C 136.9. 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 = aggre
23、gate spread rate in kg/m2,W = width of mat, mm, andC = 1000, a constant for unit conversion.9.2 (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
24、 spread rate in lbs/yd2,W = width of mat, ft, andC = 0.01984, a constant for inch-pound unit conversion.10. Report10.1 Report the following information:10.2 Moisture content of aggregate, if determined,10.3 Aggregate gradation, if determined, and whether theaggregate was pre-coated, pre-wet or dry,
25、and10.4 The aggregate quantity in kg/m2(lbs/yd2) for each 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
26、results are dependent uponFIG. 1 Layout of MatsD 56242individual pieces of equipment, 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 standarddev
27、iation) can be developed. This precision statement is onlyfor the purposes of defining 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
28、 Wabuska and Yerington,Nevada”, University of Nevada, Reno report to Nevada Department 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 moreresear
29、ch is being done on this subject.11.3 BiasSince there is no accepted reference materialsuitable 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 p
30、atent rights asserted in connection with any item mentionedin this standard. Users of 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 revisi
31、on at any time by the responsible technical committee and must be reviewed every five 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 co
32、mments will receive careful consideration 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 copyrigh
33、ted 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 56243
