1、Designation: D4580 03 (Reapproved 2012)Standard Practice forMeasuring Delaminations in Concrete Bridge Decks bySounding1This standard is issued under the fixed designation D4580; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the
2、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 practice covers procedures for surveying concretebridge decks by sounding to determine delaminations in t
3、heconcrete. It 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 h
4、avea lack of bond 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 t
5、hat the practice 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 t
6、he bridge deck 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 r
7、odor hammer may 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 hol
8、low sound indicating 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 re
9、gulatory limitations 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-MECHANIC
10、ALSOUNDING DEVICE3. 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 rec
11、eivers.Areas of 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 f
12、ound suitable and 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
13、12-V battery, twotapping wheels, two sonic receivers, a two-channel-striprecorder, 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. (15
14、2 mm) apart.1This 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 15, 2012. Published July 2012. Originallyapproved in 1986. Last previous edition appro
15、ved in 2007 as D4580 03(2007).DOI: 10.1520/D4580-03R12.2The 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 submi
16、t information regarding the identification 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,1
17、which you may attend.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States14.1.2 Sonic Receivers Two sonic receivers consisting ofoil-filled soft tires, inside each of which a receiving transduceris mounted in nonrotating proximity to the c
18、oncrete surface.The transducers shall 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 Char
19、t RecorderA two-channel-strip chart re-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 fre
20、quency components of the signal that 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 re
21、presents a predetermined length of travel. 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 chartrecord
22、er and the right-tapping wheel sonic-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 proper
23、ly while making the survey.4.3 CalibratorA 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 calibrati
24、on switch in the calibrate position, 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 var
25、iations in the response of the systemto 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
26、, mark each end of the bridge atthe interval 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 suita
27、ble for general-condition surveys of 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 de
28、ck. The device mustbe centered over the 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 Plo
29、t the limits of all portions of each 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 ar
30、ea contained in the individualdelaminated 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 o
31、ver the deck surface. Delaminatedareas 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 R
32、ods, or HammersAcceptable sizesand configurations 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 o
33、f 1-in. (25-mm) link chain of14-in. (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
34、 121.9 cm), or larger, have been foundto 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-lis
35、hing a grid system on the bridge deck. Markers such as sprayD4580 03 (2012)2paint or lumber crayon shall be used to outline delaminatedareas on the deck surface.11. Bridge Deck Layout11.1 Any accumulation of debris on the deck must beremoved.11.2 Construct a grid system on the deck surface with alum
36、ber crayon so that delaminated areas marked on 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 rin
37、ging sound will beheard. A dull or hollow sound 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 syst
38、em on thedeck, plot the areas of delamination 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. Sum
39、mary of Procedure14.1 A grid system is laid out 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 wher
40、e a dull or hollowsound is created from the rotary 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 del
41、aminations with respect to thegrid lines or with 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
42、 to an extension pole to reach the overhead surfaces 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 whenpassin
43、g over solid concrete or a dull or hollow sound 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 t
44、he hollow sound indicative ofdelaminated concrete.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 a
45、dapted to fit a telescoping extension pole.Lumber 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 syste
46、m on the deck surface, verticalstructure member, 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 ro
47、lling the rotary percussion device over the entiresurface. 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-nati
48、on on the vertical structureal members or the 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 del
49、amination on the map.18.3 Determine the total 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, andD4580 03 (2012)319.1.6 Remark
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