Nondestructive Testing to Identify Concrete Bridge Deck Deterioration (2012) / Chapter Skim
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From page 48... ...
48 Each participant submitted a report within 2 weeks of testing, as per the instruction provided to them before testing. The results from both laboratory and field validation testing are presented and discussed in this chapter, as submitted by the participants.
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49 Incipient Delamination Area with no DelaminationShallow Top Concrete Delamination A B C D E F G A B C D E F G 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 Figure 6.1. Comparison of results from IE tests on actual bridge section by different participants.
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51 10 20 30 40 50 60 70 80 Longitudinal Distance (ft) Depth Corrected GPR Condition 0 5 10 -40 -30 -20 -18 -16 -14 -12 -10 -8 -6 -4 SERIOUS POOR GOODFAIR Signal Attenuation (Normalized dB)
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52 10 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 10 5 0 20 30 40 Longitudinal Distance (ft) GPR-Estimated Concrete Cover (inches)
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53 Repeatability Measurements The participants chose a number of ways to report their repeatability measurements. Some of the participants described and illustrated the repeatability of the technology in terms of the measured raw data, whereas others described the repeatability after some degree of analyzing the raw data.
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55 Corrosion Rate Grade 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 Longitudinal Distance (ft) Electrical resistivity (kohm*
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59 Shallow Delamination Shallow Very Thin Delamination Shallow Severe Delamination Deep Delamination Vertical Cracking Rebar Corrosion Test Lines and Points 1 3 5 7 9 11 13 15 17 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 G F E D C B A N = Normal A = Anomaly but the cause of the anomaly is unknown D = Delamination C = Corrosion M = Microcracking (a)
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60 was created through the placement of synthetic inserts and not through the penetration of moisture and chlorides that would create a corrosive environment leading to rebar corrosion. A corrosive environment that would foster concrete deterioration (and, in advanced stages, initiate delamination at the rebar level)
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61 (a) Shallow Delamination Shallow Severe Delamination Vertical Cracking Deep Delamination Rebar Corrosion Test Lines and Points (b)
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62 Figure 6.12. Plan of fabricated deck (a)
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63 Shallow Delamination Shallow Very Thin Delamination Shallow Severe Delamination Deep Delamination Vertical Cracking Rebar Corrosion Test Lines and Points 1 3 5 7 9 11 13 15 17 (a)
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64 Figure 6.14. Impact echo condition maps: Participant 4 (a)
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65 1 2 3 4 5 6 7 8 E D C B A N = Normal D = Delamination C = Corrosion A = Anomaly but the cause of the anomaly is unknown M = Microcracking 1 2 3 4 5 6 7 8 E D C A A A A A B A A A A A A A A A A A A A A A N = Normal A = Anomaly but the cause of the anomaly is unknown D = Delamination C = Corrosion M = Microcracking (a)
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66 Fusion Image Infrared Image (a)
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67 Figure 6.18. GPR condition maps: Participant 9.
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