1、Designation: D 4580 03Standard Practice forMeasuring Delaminations in Concrete Bridge Decks bySounding1This standard is issued under the fixed designation D 4580; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last rev
2、ision. 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 procedures for surveying concretebridge decks by sounding to determine delaminations in theconcrete. It
3、is not intended that the procedures described hereinare to be used on bridge decks that have been overlaid withbituminous mixtures. The procedures may be used on bridgedecks that have been overlaid with portland cement concretemixtures; however, areas indicated to be delaminated may havea lack of bo
4、nd between the overlay and the underlying bridgedeck (Note 1).NOTE 1The influence of variable field conditions such as traffic noise,vibration, moisture content of the concrete, and the like, are not com-pletely known and additional investigation may be needed. It is generallyagreed that the practic
5、e should not be used on frozen concrete.1.2 The following three procedures are covered in thispractice:1.2.1 Procedure A, Electro-Mechanical Sounding DeviceThis procedure uses an electric powered tapping device, sonicreceiver, and recorder mounted on a cart. The cart is pushedacross the bridge deck
6、and delaminations are recorded on therecorder.1.2.2 Procedure B, Chain DragThis procedure consists ofdragging a chain over the bridge deck surface. The detection ofdelaminations is accomplished by the operator noting dull orhollow sounds. Tapping the bridge deck surface with a steel rodor hammer may
7、 be substituted for the chain drag.1.2.3 Procedure C, Rotary Percussion2This procedureconsists of rolling a dual-wheel, multi-toothed apparatus at-tached to an extension pole over the bridge deck surface. Thepercussive force caused by the tapping wheels will create eithera dull or hollow sound indic
8、ating any delamination.1.3 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of whoever uses this standard to consult andestablish appropriate safety and health practices and deter-mine the applicability of regulatory limita
9、tions prior to use.2. Significance and Use2.1 This practice may be used in conjunction with othermethods in determining the general condition of concretebridge decks.2.2 This practice may be used in determining specific areasof delamination requiring repair.PROCEDURE AELECTRO-MECHANICALSOUNDING DEVI
10、CE3. Summary of Procedure3.1 Longitudinal lines at a predetermined spacing are estab-lished on the bridge deck.3.2 After calibration, the sounding device is pushed alongthe established lines. Electrically powered tapping wheels emitvibrations into the deck that are sensed by sonic receivers.Areas of
11、 delamination are indicated by deflections on a stripchart recorder.3.3 All portions on the strip chart indicating delaminationsare plotted on a scaled map of the bridge deck. An outline ismade showing the areas of delamination.4. ApparatusNOTE 2The apparatus described here has been found suitable a
12、nd isthe most common type commercially available. Other apparatuses that donot exactly conform to these requirements such as sounding device,tapping rate, or sonic receivers may also be accepted.4.1 Electro-Mechanical Sounding DeviceA small, three-wheeled cart upon which is mounted a 12-V battery, t
13、wotapping wheels, two sonic receivers, a two-channel-strip re-corder, and associated connectors and cables.4.1.1 Tapping Wheels Two rigid-steel-tapping wheels ca-pable of tapping the bridge deck surface at the rate of 33times/s. The tapping wheels shall be located approximately 6in. (152 mm) apart.1
14、This practice is under the jurisdiction of ASTM Committee D04 on Road andPaving Materials and is the direct responsibility of Subcommittee D04.32 onBridges and Structures.Current edition approved July 10, 2003. Published September 2003. Originallyapproved in 1986. Last previous edition approved in 2
15、002 as D 4580 02.2The rotary sound detecting device for concrete and procedure are patentpending in the US Patent and Trademark Office by Philip K. Clark Company, Inc.,503 Central Drive, Suite 102, Virginia Beach, VA 23454. Interested parties areinvited to submit information regarding the identifica
16、tion of an alternative(s) to thispatent pending item to ASTM International Headquarters, 100 Barr Harbor Drive,PO Box C700, West Conshohocken, PA 19428-2959. Your comments will receivecareful consideration at a meeting of the responsible technical subcommittee,1which you may attend.1Copyright ASTM I
17、nternational, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.4.1.2 Sonic Receivers Two sonic receivers consisting ofoil-filled soft tires, inside each of which a receiving transduceris mounted in nonrotating proximity to the concrete surface.The transducers shall
18、 be piezo-electric hydrophones that arecoupled to the concrete surface through the soft tires and the oilwithin the wheels. Each receiving wheel shall be locatedapproximately 3 in. (76 mm) outside of and parallel to itscorresponding tapping wheel.4.1.3 Strip Chart RecorderA two-channel-strip chart r
19、e-corder shall be capable of receiving the signals from the sonicreceivers. The electronics unit shall accept only those portionsof the signal that occur during the first 3 ms after theoccurrence of a tap and further limit the recorder to respondonly to those frequency components of the signal that
20、lies inthe range of 300 to 1200 Hz. The processed signals shall berectified and integrated to produce a visual record on therespective channels of the record chart. The chart shall bedriven in proportion to the distance traveled so that the lengthof the record represents a predetermined length of tr
21、avel. Therecording pen on one channel shall be capable of acting as anevent marker.4.1.4 Cables and ConnectorsThere shall be sufficientcables and connectors for connection of the left-tapping wheelsonic-receiver system to the left channel of the strip chartrecorder and the right-tapping wheel sonic-
22、receiver system tothe right channel of the strip chart recorder.4.2 Measuring Tape, Markers, StringlineA measuringtape, markers, and stringline shall be provided for establishinglines on the bridge deck that will serve to keep the soundingdevice positioned properly while making the survey.4.3 Calibr
23、atorA solid aluminum bar capable of checkingthe operational system of the sounding device.5. Calibration5.1 Place the device on the calibrator bar in the on positionwith the chart drive operating. This will establish the electricalzero line.5.2 With the calibration switch in the calibrate position,
24、turnon the power, transmitter, and chart drive switches. Each of therecorder pens should trace a rather erratic line approximatelyhalf way between the maximum pen movement and theelectrical zero line. This line may vary one or two majordivisions due to normal variations in the response of the system
25、to the aluminum bar. If the response line does not fall asdescribed, then each channel shall be adjusted with theappropriate calibration adjustment control.6. Bridge Deck Layout6.1 Any accumulation of debris on the deck must beremoved.6.2 Beginning at a curb face, mark each end of the bridge atthe i
26、nterval chosen for making the survey.NOTE 3Various spacing intervals such as 15 in. (38.1 cm), 18 in. (45.7cm), and 3 ft (91.4 cm) have been used. The closer spacings arerecommended for an in-depth analysis of the bridge deck. The widerspacing intervals are suitable for general-condition surveys of
27、bridgedecks.7. Test Procedure7.1 Stretch the stringline between corresponding marks oneach end of the bridge.7.2 With the switch in the operate position and the powerand transmitter switches on, push the sounding device at anormal walking speed over the bridge deck. The device mustbe centered over t
28、he stringline. Continue in this manner untilthe entire deck has been surveyed.7.3 Mark the ends of the bridge, expansion devices, and soforth, by activating the event marker.8. Data Interpretation and Plotting8.1 Construct a scaled map of the deck surface.8.2 Plot the limits of all portions of each
29、trace indicating adelamination. A delamination is considered a trace deflectionof four or more minor chart divisions above the normalbackground response.8.3 Connect the limits of these plots and outline the indi-vidual delaminated areas.8.4 Determine the total area contained in the individualdelamin
30、ated areas.8.5 Divide the total delaminated area by the total bridgedeck area and multiply times 100 to yield the percent of deckarea delaminated.PROCEDURE BCHAIN DRAG9. Summary of Procedure9.1 A grid system is laid out on the bridge deck.9.2 Chains are dragged over the deck surface. Delaminatedarea
31、s are those where a dull or hollow sound from the chaindragging operation is apparent.9.3 Delaminated areas are outlined on the deck surface. Amap is prepared indicating the location of delaminations withrespect to the grid lines.10. Apparatus10.1 Chains, Steel Rods, or HammersAcceptable sizesand co
32、nfigurations of chains, steel rods, or hammers are thosethat produce a clear ringing sound when dragged or tappedover nondelaminated concrete and a dull or hollow sound overdelaminated concrete. A common chain drag configurationconsists of four or five segments of 1-in. (25-mm) link chain of14-in. (
33、6-mm) diameter steel approximately 18 in. (45.7 cm)long, attached to a 2-ft (61-cm) piece of aluminum or coppertube to which a 2- to 3-ft (61- to 91.4-cm) piece of tubing, forthe handle, is attached to the midpoint, forming a T. Steel rods58 in. by 4 ft (16 mm by 121.9 cm), or larger, have been foun
34、dto produce satisfactory results.NOTE 4Heavier chains have generally been shown to produce a moredefinitive sound under heavy traffic conditions.10.2 Measuring Tape, Markers, and StringlineA measur-ing tape, markers, and stringline shall be provided for estab-lishing a grid system on the bridge deck
35、. Markers such as spraypaint or lumber crayon shall be used to outline delaminatedareas on the deck surface.D458003211. Bridge Deck Layout11.1 Any accumulation of debris on the deck must beremoved.11.2 Construct a grid system on the deck surface with alumber crayon so that delaminated areas marked o
36、n the deckcan be plotted easily on a map by referencing the areas to thegrid.12. Test Procedure12.1 Survey the entire bridge deck by dragging the chains ortapping with the steel rod or hammer over the entire surface.On nondelaminated concrete, a clear ringing sound will beheard. A dull or hollow sou
37、nd is emitted when delaminatedconcrete is encountered.12.2 Mark the areas of delamination on the deck surfacewith the spray paint or lumber crayon.13. Plotting13.1 Construct a scaled map of the deck surface.13.2 By referencing to the established grid system on thedeck, plot the areas of delamination
38、 on the map.13.3 Determine the total area contained in the individualdelaminated areas.13.4 Divide the total delaminated area by the total bridgedeck area and multiply by 100 to yield the percent of deck areadelaminated.PROCEDURE CROTARY PERCUSSION14. Summary of Procedure14.1 A grid system is laid o
39、ut on the bridge deck, verticalstructural support or the underside of the bridge structure.14.2 A rotary percussive device is rolled over the bridgedeck, vertical structural member or the underside of the bridgedeck. Delaminated areas are those areas where a dull or hollowsound is created from the r
40、otary percussion units striking thesurface.14.3 Delaminated areas are outlined on the bridge deckssurface, vertical structural surface or on the underside of thebridge deck surface. A map (or field schematic) is preparedindicating the locations of the delaminations with respect to thegrid lines or w
41、ith respect to their proximity to permanentstructural elements.15. Apparatus15.1 Rotary Percussion Sounding DeviceA “T” shapeddevice with two rotary percussion units, which spin whenrolled over a concrete surface. The device is either hand-held orattached to an extension pole to reach the overhead s
42、urfaces ofstructural members or the underside of the bridge deck surface.As the rotary percussion sounding device is rolled over thesurface, the two percussion units strike the surface withsufficient force to create either a clear ringing sound whenpassing over solid concrete or a dull or hollow sou
43、nd whenpassing over delaminated concrete.15.2 Rotary Percussion UnitsTwo hardedened steel, 15-point percussion units are fit onto an axle and are capable ofbeing rolled over the surface to be tested to sufficiently strikethe concrete surface to generate the hollow sound indicative ofdelaminated conc
44、rete.15.3 Extension PoleThe rotary percussion device is at-tached to a telescoping extension pole to reach the surface to betested, either the top slab deck or an overhead structuralmember.15.4 Measuring Wheel, Markers, and String LineA mea-suring wheel adapted to fit a telescoping extension pole.Lu
45、mber crayons, spray paint markers, and string line shall beused to establish a grid system so that the delaminated areascan be accurately recorded.16. Bridge Deck Layout16.1 Any accumulation of debris on the deck must beremoved.16.2 Construct a grid system on the deck surface, verticalstructure memb
46、er, or the underside of the bridge deck withchalk line, lumber crayon, or by the test areas proximity tofixed structural components. Plot the areas on the field sheet.17. Test Procedure17.1 Survey the entire deck surface or overhead structuralmember by rolling the rotary percussion device over the e
47、ntiresurface. On non-delaminated concrete, a clear ringing soundwill be heard. A dull or hollow sound will indicate delaminatedconcrete.17.2 Mark the areas of delamination on the deck surfacewith spray paint or lumber crayon. Mark the areas of delami-nation on the vertical structureal members or the
48、 underside ofthe deck structure with an up-spraying spray paint device orlumber crayon.18. Plotting18.1 Construct a scale map of the surface to be tested.18.2 By referencing the established grid system on the deckor overhead surface, plot the areas of delamination on the map.18.3 Determine the total
49、 delaminated area within the gridsystem.18.4 Divide the total delaminated area by the total bridgedeck area (or overhead structural element) and multiply by 100to yield the percent of deck area or overhead structural elementfound to be delaminated.19. Report19.1 The report shall include the following information:19.1.1 Bridge location and description,19.1.2 Survey method used,19.1.3 Date of test,19.1.4 Spacing of interval if Procedure A is used,19.1.5 Percent of deck delaminated, and19.1.6 Remarks.20. Precision and Bias20.1 The nature of the methods do not all
