1、Designation: D5624 02 (Reapproved 2007)D5624 13Standard Test Method 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
2、 adoption or, in the case of revision, the 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 test method details the procedure for determining the aggregat
3、e spread rates in approximately 0.33-m (1-ft) transverseincrements.1.2 The values stated in SI units are to be regarded as standard. The inch-pound units shown in parentheses are for informationonly.1.3 This standard does not purport to address all of the safety concerns, if any, associated with its
4、 use. It is the responsibilityof the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatorylimitations prior to use.2. Referenced Documents2.1 ASTM Standards:2C566 Test Method for Total Evaporable Moisture Content of Aggregate by Dryi
5、ngC136 Test Method for Sieve Analysis of Fine and Coarse AggregatesE898 Test Method of Testing Top-Loading, Direct-Reading Laboratory Scales and Balances3. Summary of Test Method3.1 The transverse-aggregate spread rate is determined by the use of a series of rubber pads laid side by side width-wise
6、acrossthe pavement. The chip spreader is then allowed to proceed across the rubber mats with the gates open allowing the aggregate todrop onto the mats. Aggregate collected on each of the mats is removed and weighed. The transverse-aggregate distribution thenis calculated, and the aggregate spreader
7、 adjusted if desired. Moisture content and aggregate gradation can be determined from thecollected material.4. Significance and Use4.1 The results from this test method are used to calibrate aggregate spreaders and verify the uniformity of distributiontransversely prior to construction of the surfac
8、e treatment by determining the average quantity of aggregate spread per unit area.4.2 The test method is useful for quality control during construction to monitor the spread rate.4.3 The samples obtained during construction by this test method are useful for determination of moisture content and gra
9、dingwhen such information is required.5. Apparatus5.1 BalanceA balance (or scale) of sufficient capacity to handle the mass of the aggregate shall be provided. This balance (orscale) shall be readable and accurate to 1 g if only the transverse spread rate is being determined; an accuracy of 0.1 g is
10、 neededif moisture content is being determined. All balances, or scales, shall meet the requirement set forth in Method E898 for toploading, direct-reading laboratory scales and balances.1 This test method practice is under the jurisdiction of ASTM Committee D04 on Road and Paving Materials and is t
11、he direct responsibility of Subcommittee D04.24 onBituminous Surface Treatments.Current edition approved Dec. 1, 2007Dec. 15, 2013. Published January 2008January 2014. Originally approved in 1994. Last previous edition approved in 20022007 asD5624 02.D5624 02 (2007). DOI: 10.1520/D5624-02R07.10.1520
12、/D5624-13.2 For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the standards Document Summary page on the ASTM website.This document is not an ASTM standard and is intend
13、ed only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Becauseit may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current
14、 versionof the standard as published by ASTM is to be considered the official document.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States15.2 ContainersContainers, sufficient in number for the number of samples to be taken, and of a suff
15、icient size to hold thecontents of one rubber mat. If moisture content is to be determined, then the container shall be sealable.5.3 Rubber MatsRubber mats shall have grooves of sufficient depth to prevent aggregate from rolling and slipping when thechips are spread.The mats shall be cut in widths a
16、ppropriate for the gate openings of the equipment being adjusted.Widths of 0.305m (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 thegrooves are perpendicular to the 0.9144 m (3 ft) side.NOTE 1Rubber floor mats conforming to the
17、se specifications are available at local hardware stores. Various sizes can be accommodated and bothinchpound and SI units can be handled.5.4 OvenThe oven shall be a forced air type oven capable of maintaining a uniform temperature of 110 6 5C (230 6 9F).PROCEDURES6. Determination of Transverse Spre
18、ad Rate6.1 Place the rubber mats side by side width-wise on the pavement with the grooves perpendicular to the centerline (Fig. 1).The number of rubber mats to be used shall be equal to the width of aggregate distribution to be monitored.6.2 Tare one container for each mat to be used. If the contain
19、er has a lid, tare the container with the lid. Designate this massas B.6.3 Drive the aggregate spreader over the pads with the gates open to allow the aggregate to fall onto the rubber mats. Openthe gates a minimum of 2.44 m (8 ft) before reaching the rubber mats. This allows time for the transverse
20、-aggregate distributionto stabilize.6.4 The aggregate spreader shall be operated in the manner intended for use during construction. Speed and gear settings shallbe representative of anticipated construction use.6.5 After the aggregate spreader has passed over the rubber mats, carefully brush from t
21、he 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 labeled container.Repeat this procedure until the aggregate from each of the mats has been placed in individual containers.6.6 Determine the mass of each con
22、tainer of aggregate. Designate this mass as A.7. Moisture Content of Aggregate (Optional)7.1 When the moisture content of the aggregate at the time of construction is required, obtain the samples using the steps in6.1 through 6.6. Place samples for moisture content determination in a sealed containe
23、r within 5 min of spreading the aggregate.7.2 Determine the mass of each sealed container of moist aggregate within 4 h of obtaining the sample. Subtract the mass ofthe container to determine the mass of the moist aggregate.7.3 Determine the moisture content of the aggregate in accordance with Test
24、Method C566.8. Aggregate Gradation (Optional)8.1 Combine the aggregate from all individual containers into one container. Mix aggregate through riffle splitter at least twiceto ensure adequate mixing.8.2 Oven dry to a constant mass.FIG. 1 Layout of MatsD5624 1328.3 Perform sieve analysis according t
25、o Test Method C136.9. Calculation9.1 (SI Units) The aggregate spread rate is determined by the following:S 5C A 2B!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 un
26、it conversion.9.2 (Inch-Pound Units) The aggregate spread rate is determined by the following:S 5C A 2BLW!9 453.6(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 in
27、ch-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 the aggregate was pre-coated, pre-wet or dry, and10.4 The aggregate quantity in kg/m2 (lbs/yd2) for each mat. Report results
28、 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 0.47 kg/m2 (0.86lbs/yd2). Because test results are dependent upon individual pieces of equipment, local requireme
29、nts for operation of equipment,equipment speed, as well as the fact that there is no means of providing a standard material for testing, no estimate ofreproducibility (between-laboratory standard deviation) can be developed. This precision statement is only for the purposes ofdefining the ability of
30、 one technician to measure the transverse spread rate for any given set of testing conditions.NOTE 2Precision estimated from data reported in “Evaluation of 1989 Chip Seal Test Sections on US95ABetween Wabuska andYerington, Nevada”,University of Nevada, Reno report to Nevada Department of Transporta
31、tion, June, 1991.11.2 Preliminary testing also suggests that standard deviations will vary depending on whether pre-wet or pre-coated aggregateis used. However, this has not been proven and more research is being done on this subject.11.3 BiasSince there is no accepted reference material suitable fo
32、r determining the bias no statement on the bias of this testmethod is being made.D5624 13312. 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 thi
33、s 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 yea
34、rs 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 committ
35、ee, 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
36、-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 stan
37、dard may also be secured from the ASTM website (www.astm.org/COPYRIGHT/).1. Scope1.1 This practice details the procedure for determining the aggregate spread rates in approximately 0.33-m transverseincrements.1.2 The values stated in SI units are to be regarded as standard. No other units of measure
38、ment are included in this standard.1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibilityof the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatorylimitat
39、ions prior to use.2. Referenced Documents2.1 ASTM Standards:2C136 Test Method for Sieve Analysis of Fine and Coarse AggregatesC566 Test Method for Total Evaporable Moisture Content of Aggregate by DryingE898 Test Method of Testing Top-Loading, Direct-Reading Laboratory Scales and Balances3. Summary
40、of Practice3.1 The transverse-aggregate spread rate is determined by the use of a series of pads laid side by side width-wise across thepavement. The aggregate spreader is then allowed to proceed across the mats with the gates open allowing the aggregate to droponto the mats. Aggregate collected on
41、each of the mats is removed and weighed. The transverse-aggregate distribution then iscalculated, and the aggregate spreader adjusted if desired. Moisture content and aggregate gradation can be determined from thecollected material.4. Significance and Use4.1 This practice can be used to calibrate ag
42、gregate spreaders and verify the uniformity of distribution transversely prior toconstruction of the surface treatment by determining the average quantity of aggregate spread per unit area.4.2 This practice can be useful for quality control during construction to monitor the spread rate.4.3 The samp
43、les obtained during construction can also be used for the determination of moisture content and grading when suchinformation is required.5. Apparatus5.1 BalanceA balance (or scale) of sufficient capacity to handle the mass of the aggregate shall be provided. This balance (orscale) shall be readable
44、and accurate to 1 g if only the transverse spread rate is being determined; an accuracy of 0.1 g is neededif moisture content is being determined. All balances, or scales, shall meet the requirement set forth in Method E898 for toploading, direct-reading laboratory scales and balances.5.2 Containers
45、Containers, sufficient in number for the number of samples to be taken, and of a sufficient size to hold thecontents of one mat. If moisture content is to be determined, then the container shall be sealable.5.3 MatsIndividual flat mats with a known surface area. The material should be able to stay i
46、n place as the aggregate spreadermoves over the mats in the wheel paths. The material should also have sufficient texture so the aggregate does not roll appreciablywhen dropped from the aggregate spreader (Note 1).NOTE 1Rubber floor mats and roofing felt materials of known dimensions have been used
47、successfully.D5624 1345.4 OvenThe oven shall be a forced air type oven capable of 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 pavement with the grooves perpendicular to the centerline (Fig. 1). Th
48、ispractice can be used to evaluate the uniformity of the aggregate spread rate across the entire width of spreader box, or limited tokey areas of interest such as within the wheel paths.Adjustments to the transverse aggregate spread rate are more easily made whenthe width of the individual mats are
49、matched to the width of the individual gates on the aggregate spreader.NOTE 2Gate widths may vary across the aggregate speader box and by equipment manufacturer.6.2 Drive the aggregate spreader over the pads with the gates open to allow the aggregate to fall onto the mats. The aggregatespreader should be operating at the desired speed and aggregate spread rate before reaching the mats.6.3 After the aggregate spreader has passed over the mats, carefully brush the aggregate away from the mat edges toward thecenter of each mat, recover the aggregate from ea
