1、Designation: D 6433 07Standard Practice forRoads and Parking Lots Pavement Condition IndexSurveys1This standard is issued under the fixed designation D 6433; 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 the determination of roads andparking lots pavement condition through visual surveys usingthe Pavement Condit
3、ion Index (PCI) method of quantifyingpavement condition.1.2 The PCI for roads and parking lots was developed by theU.S. Army Corps of Engineers (1, 2).2It is further verified andadopted by DOD and APWA.1.3 The values stated in inch-pound units are to be regardedas the standard. The SI units given in
4、 parentheses are forinformation only.1.4 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 appro-priate safety and health practices and determine the applica-bility of regulatory lim
5、itations prior to use. Specific precau-tionary statements are given in Section 6.2. Terminology2.1 Definitions of Terms Specific to This Standard:2.1.1 additional samplea sample unit inspected in addi-tion to the random sample units to include nonrepresentativesample units in the determination of th
6、e pavement condition.This includes very poor or excellent samples that are nottypical of the section and sample units, which contain anunusual distress such as a utility cut. If a sample unitcontaining an unusual distress is chosen at random it should becounted as an additional sample unit and anoth
7、er randomsample unit should be chosen. If every sample unit is surveyed,then there are no additional sample units.2.1.2 asphalt concrete (AC) surfaceaggregate mixturewith an asphalt cement binder. This term also refers to surfacesconstructed of coal tars and natural tars for purposes of thispractice
8、.2.1.3 pavement brancha branch is an identifiable part ofthe pavement network that is a single entity and has a distinctfunction. For example, each roadway or parking area is aseparate branch.2.1.4 pavement condition index (PCI)a numerical ratingof the pavement condition that ranges from 0 to 100 wi
9、th 0being the worst possible condition and 100 being the bestpossible condition.2.1.5 pavement condition ratinga verbal description ofpavement condition as a function of the PCI value that variesfrom “failed” to “excellent” as shown in Fig. 1.2.1.6 pavement distressexternal indicators of pavementdet
10、erioration caused by loading, environmental factors, con-struction deficiencies, or a combination thereof. Typical dis-tresses are cracks, rutting, and weathering of the pavementsurface. Distress types and severity levels detailed inAppendixX1 forAC, andAppendix X2 for PCC pavements must be usedto o
11、btain an accurate PCI value.2.1.7 pavement sample unita subdivision of a pavementsection that has a standard size range: 20 contiguous slabs (68slabs if the total number of slabs in the section is not evenlydivided by 20 or to accommodate specific field condition) forPCC pavement, and 2500 contiguou
12、s square feet, 6 1000 ft2(225 6 90 m2), if the pavement is not evenly divided by 2500or to accommodate specific field condition, for AC pavement.2.1.8 pavement sectiona contiguous pavement area hav-ing uniform construction, maintenance, usage history, andcondition. A section should have the same tra
13、ffic volume andload intensity.2.1.9 portland cement concrete (PCC) pavementaggregate mixture with portland cement binder includingnonreinforced and reinforced jointed pavement.2.1.10 random samplea sample unit of the pavementsection selected for inspection by random sampling techniques,such as a ran
14、dom number table or systematic random proce-dure.3. Summary of Practice3.1 The pavement is divided into branches that are dividedinto sections. Each section is divided into sample units. Thetype and severity of pavement distress is assessed by visual1This practice is under the jurisdiction of ASTM C
15、ommittee E17 on Vehicle -Pavement Systems and is the direct responsibility of Subcommittee E17.41 onPavement Testing, Evaluation, and Management Methods.Current edition approved Dec. 1, 2007. Published January 2008. Originallyapproved in 1999. Last previous edition approved in 2003 as D 6433 03.2The
16、 boldface numbers in parentheses refer to the list of references at the end ofthis standard.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.inspection of the pavement sample units. The quantity of thedistress is measured as described
17、 in Appendix X1 and Appen-dix X2. The distress data are used to calculate the PCI for eachsample unit. The PCI of the pavement section is determinedbased on the PCI of the inspected sample units within thesection.4. Significance and Use4.1 The PCI is a numerical indicator that rates the surfacecondi
18、tion of the pavement. The PCI provides a measure of thepresent condition of the pavement based on the distressobserved on the surface of the pavement, which also indicatesthe structural integrity and surface operational condition (lo-calized roughness and safety). The PCI cannot measure struc-tural
19、capacity nor does it provide direct measurement of skidresistance or roughness. It provides an objective and rationalbasis for determining maintenance and repair needs andpriorities. Continuous monitoring of the PCI is used to estab-lish the rate of pavement deterioration, which permits earlyidentif
20、ication of major rehabilitation needs. The PCI providesfeedback on pavement performance for validation or improve-ment of current pavement design and maintenance procedures.5. Apparatus5.1 Data Sheets, or other field recording instruments thatrecord at a minimum the following information: date, loca
21、tion,branch, section, sample unit size, slab number and size, distresstypes, severity levels, quantities, and names of surveyors.Example data sheets for AC and PCC pavements are shown inFigs. 2 and 3.5.2 Hand Odometer Wheel, that reads to the nearest 0.1 ft(30 mm).5.3 Straightedge or String Line, (A
22、C only), 10 ft (3 m).5.4 Scale, 12 in. (300 mm) that reads to18 in. (3 mm) orbetter. Additional 12-in. (300 mm) ruler or straightedge isneeded to measure faulting in PCC pavements.5.5 Layout Plan, for network to be inspected.6. Hazards6.1 Traffic is a hazard as inspectors may walk on thepavement to
23、perform the condition survey.7. Sampling and Sample Units7.1 Identify branches of the pavement with different usessuch as roadways and parking on the network layout plan.7.2 Divide each branch into sections based on the pave-ments design, construction history, traffic, and condition.7.3 Divide the p
24、avement sections into sample units. If thepavement slabs in PCC have joint spacing greater than 25 ft (8m) subdivide each slab into imaginary slabs. The imaginaryslabs all should be less than or equal to 25 ft (8 m) in length,and the imaginary joints dividing the slabs are assumed to bein perfect co
25、ndition. This is needed because the deduct valuesdeveloped for jointed concrete slabs are less than or equal to 25ft (8 m).7.4 Individual sample units to be inspected should bemarked or identified in a manner to allow inspectors andquality control personnel to easily locate them on the pavementsurfa
26、ce. Paint marks along the edge and sketches with locationsconnected to physical pavement features are acceptable. It isnecessary to be able to accurately relocate the sample units toallow verification of current distress data, to examine changesin condition with time of a particular sample unit, and
27、 to enablefuture inspections of the same sample unit if desired.7.5 Select the sample units to be inspected. The number ofsample units to be inspected may vary from the following: allof the sample units in the section, a number of sample units thatprovides a 95 % confidence level, or a lesser number
28、.7.5.1 All sample units in the section may be inspected todetermine the average PCI of the section. This is usuallyprecluded for routine management purposes by availablemanpower, funds, and time. Total sampling, however, isdesirable for project analysis to help estimate maintenance andrepair quantit
29、ies.7.5.2 The minimum number of sample units (n) that must besurveyed within a given section to obtain a statisticallyadequate estimate (95 % confidence) of the PCI of the sectionFIG. 1 Pavement Condition Index (PCI), Rating Scale, andSuggested ColorsD6433072FIG. 2 Flexible Pavement Condition Survey
30、 Data Sheet for Sample UnitD6433073is calculated using the following formula and rounding n to thenext highest whole number (see Eq 1).n 5 Ns2/e2/4!N 1! 1 s2! (1)where:e = acceptable error in estimating the section PCI; com-monly, e=65 PCI points;s = standard deviation of the PCI from one sample uni
31、t toanother within the section. When performing the initialinspection the standard deviation is assumed to be tenfor AC pavements and 15 for PCC pavements. Thisassumption should be checked as described below afterPCI values are determined. For subsequent inspections,the standard deviation from the p
32、receding inspectionshould be used to determine n; and,N = total number of sample units in the section.7.5.2.1 If obtaining the 95 % confidence level is critical, theadequacy of the number of sample units surveyed must beconfirmed. The number of sample units was estimated based onan assumed standard
33、deviation. Calculate the actual standarddeviation (s) as follows (see Eq 2):s 5 (ni51PCIi PCIs!2/n 1!1/2(2)where:PCIi= PCI of surveyed sample units i,PCIs= PCI of section (mean PCI of surveyed sampleunits), andn = total number of sample units surveyed.FIG. 3 Joint Rigid Pavement Condition Survey Dat
34、a Sheet for Sample UnitD64330747.5.2.2 Calculate the revised minimum number of sampleunits (Eq 1) to be surveyed using the calculated standarddeviation (Eq 2). If the revised number of sample units to besurveyed is greater than the number of sample units alreadysurveyed, select and survey additional
35、 random sample units.These sample units should be spaced evenly across the section.Repeat the process of checking the revised number of sampleunits and surveying additional random sample units until thetotal number of sample units surveyed equals or exceeds theminimum required sample units (n) in Eq
36、 1, using the actualtotal sample standard deviation.7.5.3 Once the number of sample units to be inspected hasbeen determined, compute the spacing interval of the unitsusing systematic random sampling. Samples are spaced equallythroughout the section with the first sample selected at random.The spaci
37、ng interval (i) of the units to be sampled is calculatedby the following formula rounded to the next lowest wholenumber:i 5 N/n (3)where:N = total number of sample units in the section, andn = number of sample units to be inspected.The first sample unit to be inspected is selected at randomfrom samp
38、le units 1 through i. The sample units within asection that are successive increments of the interval i after thefirst randomly selected unit also are inspected.7.6 A lessor sampling rate than the above mentioned 95 %confidence level can be used based on the condition surveyobjective. As an example,
39、 one agency uses the following tablefor selecting the number of sample units to be inspected forother than project analysis:Given Survey1 to 5 sample units 1 sample unit6 to 10 sample units 2 sample units11 to 15 sample units 3 sample units16 to 40 sample units 4 sample unitsover 40 sample units 10
40、%7.7 Additional sample units only are to be inspected whennonrepresentative distresses are observed as defined in 2.1.1.These sample units are selected by the user.8. Inspection Procedure8.1 The definitions and guidelines for quantifying distressesfor PCI determination are given in Appendix X1 for A
41、Cpavements. Using this test method, inspectors should identifydistress types accurately 95 % of the time. Linear measure-ments should be considered accurate when they are within10 % if remeasured, and area measurements should be consid-ered accurate when they are within 20 % if remeasured.Distress s
42、everities that one determines based on ride quality areconsidered subjective.8.2 Asphalt Concrete (AC) Surfaced PavementIndividually inspect each sample unit chosen. Sketch thesample unit, including orientation. Record the branch andsection number and the number and type of the sample unit(random or
43、 additional). Record the sample unit size measuredwith the hand odometer. Conduct the distress inspection bywalking over the sidewalk/shoulder of the sample unit beingsurveyed, measuring the quantity of each severity level ofevery distress type present, and recording the data. Eachdistress must corr
44、espond in type and severity to that describedin Appendix X1. The method of measurement is included witheach distress description. Repeat this procedure for eachsample unit to be inspected. A copy of a Blank FlexiblePavement Condition Survey Data Sheet for Sample Unit isincluded in Fig. 2.8.3 PCC Pav
45、ementsIndividually inspect each sample unitchosen. Sketch the sample unit showing the location of theslabs. Record the sample unit size, branch and section number,and number and type of the sample unit (random or additional),the number of slabs in the sample unit and the slab sizemeasured with the h
46、and odometer. Perform the inspection bywalking over the sidewalk/shoulder of the sample unit beingsurveyed and recording all distress existing in the slab alongwith their severity level. Each distress type and severity mustcorrespond with that described in Appendix X2. Summarizethe distress types, t
47、heir severity levels and the number of slabsin the sample unit containing each type and severity level.Repeat this procedure for each sample unit to be inspected. Acopy of a Blank Jointed Rigid Pavement Condition SurveyData Sheet for Sample Unit is included in Fig. 3.9. Calculation of PCI for Asphal
48、t Concrete (AC)Pavement9.1 Add up the total quantity of each distress type at eachseverity level, and record them in the “Total Severities”section. For example, Fig. 4 shows five entries for the DistressType 1, “Alligator Cracking”: 5L, 4L, 4L, 8H, and 6H. Thedistress at each severity level is summe
49、d and entered in the“Total Severity” section as 13 ft2(1.2 m2) of low severity and14 ft2(1.3 m2) of medium severity. The units for the quantitiesmay be either in square feet (square meters), linear feet(meters), or number of occurrences, depending on the distresstype.9.2 Divide the total quantity of each distress type at eachseverity level from 9.1 by the total area of the sample unit andmultiply by 100 to obtain the percent density of each distresstype and severity.9.3 Determine the deduct value (DV) for each distress typeand severity level combination from the
copyright@ 2008-2019 麦多课文库（www.mydoc123.com）网站版权所有
备案/许可证编号：苏ICP备17064731号-1