1 (-38,- 2) V=25μ 45=42μ H=70μ 2m m 4m m (-44,4) V= － μ 45= － μ H=21μ (-40,4) V=58μ 45= － μ H=55μ (-36,4) V=-34μ 45=45μ H=121 μ (-32,4) V=14μ 45=43μ H=112μ (-28,4) V=371μ 45=168 μH=319 μ (-44,0) V= － μ 45= － μ H=23μ (-40,0) V=37μ 45= － μ H=86μ (-36,0) V=-14μ 45=36μ H=425μ (-32,0) V=9μ 45=- 26μ H=338μ (-28,0) V=244μ 45=140 μ H=364μ (-44,- 4) V= － μ 45= － μ H=141μ (-36,- 4) V=30μ 45=37 μH=25 0μ (-32,- 4) V=17μ 45=27 μH=84 μ (-28,- 4) V=32μ 45=-133μ H=364μ (-40,- 4) V=- 15μ 45= － μ H=42μ -X (- 26,0) Rozette Gauge φ50mm was used Data Analyses

2 (2,34) V=- 141μ 45=- 42μ H=36μ 2m m 4m m (-4,36) V=- 78μ 45=- 4μ H=48μ (4,36) V=- 158μ 45=- 52μ H=40μ (-4,32) V=-3μ 45=53 μH=81 μ (4,32) V=- 56μ 45=- 5μ H=60μ (4,28) V=372μ 45=- 152μ H=-701μ (-4,28) V=-98μ 45=- 60μ H=- 643μ +Y (-4,44) V=- 460μ 45= － μ H= － μ (-4,40) V=-120μ 45= － μ H=602μ (4,44) V=- 347μ 45= － μ H= － μ (4,40) V=- 42μ45 = － μ H=-3μ (0,2 6) Rozzette gauge (0,28) V=- 457μ 45=- 49μ H=332μ (0,32) V=- 89μ 45=- 3μ H=27μ (0,36) V=- 157μ 45=- 92μ H=33μ (0,40) V=- 149μ45 = － μH=789 μ (0,44) V=-212μ 45= － μ H= － μ

Deviation ： 1.7% Test Result Concrete Verification on Device Accuracy Magnified Image

Load test on a RC beam Target (West) Target (Centre)

West Strain Distribution （ X component only ） →←0.04 →← →← →←0.21 →← KN700 KN800 KN 600 KN500 KN400 KN 300 KN200 KN100 KN

West Strain Distribution （ X-dir component only ） 400 KN 以下 Legend ・・・ ： Crack observed before loading ―- ： Crack propagate during loading ： Blot out of the water during loading Unit ： pixel （μ）（μ） 500 KN Test on RC beam

Test Summary ２ points bending Up to ２８０ｋ N 12 Φ12.7 ｍ ｍ strand configurati on ４０ｋ N increments 700 PC beam dimension Unit ： mm

Main Scanning direction 100 ㎜ 150 ㎜ 200 ㎜ 250 ㎜ Strain gage configuration Smart Scanner Setup Distance from lower fiber Scanned area

Test Results Verification

Test Results Verification １６０ｋ N Crack occures

Bottom slab Strain measurement Strain gauge configuration Smart Scanner setup at the lower section Central line 60mm gauge 30mm gauge

Strain measurement ０ KN 40KN 80KN 120KN160K200KN ： Crack width < 0.08mm 240KN280KN ： Crack width > 0.08mm Pixel （μ）（μ） Scanned strain countour

Beam surface Strain Measurement Method Primary direction Secondary dir Distance from lower fiber196mm Strain gauge Smart Scanner setup

Results Measured Point Load （ KN) Strain(μ) Error(μ)Average(μ) GaugeScanner CL-x CL-y CL-z Scanner and strain-gauge comparison

Test Result 80KN120KN160KN200KN240K N Measured strain contour

BackgroundBackground Maintenance strategy based on long term monitoring scheme to prolong structure’s life span Runway D （ Open October 2010 ） - Wharf: precast slab; field pouring in between - Provide holes for Stick Scanner to inspect concrete condition Tokyo International Airport - Serviceability assurance 100 years. - Maintenance planning from design stage Holes for stick scanner have been provided since construction stage LandfillWhar f Haneda Runway D

Field-poured concrete in between two precast concrete slabs Crack Inspection holes Two types: φ22mm and φ26mm Inspection holes Two types: φ22mm and φ26mm PCa slab Shear connectors Field poured concrete Steel beam Pavemen t Stirrups Stick Scanner

Modification for Tokyo International Airport ① Resolution ： 300dpi ② Diameter ： φ22mm ， φ26mm ③ Max. length ： 615mm ⑤ Weight ： 997g ⑥ Connection ： PC card - cable connector Rear grip Front grip Guide rail sensor ④ Total length ： 890mm

Feature １ It works for two diameters φ22mm φ26mm Rear guide ring Front guide ring modifier Adjust the focal length of sensor

Feature ２ 1 st turn ： right, scan 1 cycle 2 nd turn ： insert 95mm, left, scan 1 cycle 3 rd turn: insert 95mm, right, scan 1 cycle Turn right Turn left Turn right 4 th turn: insert 95mm, left, scan 1 cycle Insert 95mm

Crack evaluation φ22mm Scale （ｍ ｍ） Scan （ｍ ｍ） Dev （ｍ ｍ）

Scale （ｍ ｍ） Scan （ｍ ｍ） Dev （ｍ ｍ） Crack width 9mm W=0.15 mm φ26mm