Title :
Ground Penetrating Radar wave behavior under different corrosion levels of concrete
Author :
Karunanayake, K.T.S. ; Dissanayake, P.B.R. ; Galagedara, L.W.
Author_Institution :
Fac. of Eng., Univ. of Peradeniya, Peradeniya, Sri Lanka
fDate :
June 30 2014-July 4 2014
Abstract :
Corrosion of reinforced concrete structures is the most significant issue for its safety and lifetime. During the structural assessment of lifetime evaluation of structures, destructive tests might increase the damage size of the structure. This investigation attempts to identify the corrosion effect of the reinforcement in concrete and chloride contamination of the concrete using Ground Penetrating Radar (GPR) as a non-destructive testing method. A 300 mm wide, 600 mm long and 100 mm high three concrete slab panels were prepared using a 12 mm rebar. After 28 days of casting the concrete slab panels, reflection and common mid-point GPR surveys were performed using Pulse EKKO PRO system with 1000 MHz centre frequency transducers. The concrete panels were partly submerged in 5% NaCl solution and reinforcement bar was corroded using the impedance current technique. A 17.2 V DC current was applied to accelerate the corrosion of slab panels and kept it for 24 hours. The GPR surveys were repeated and the same procedure was performed after 48 h, 72 h and 96 h of submerged time intervals. With parallel to each GPR data acquisition steps, half-cell potential test was also conducted. The collected GPR data were analyzed separately using the EKKO Mapper, GFP Edit and EKKO View Deluxe software packages. Analyzed results clearly showed that the GPR wave velocity did not change with corrosion time, but the reflected wave amplitude decreases with increasing corrosion time which is in correspondence with the half-cell potential test.
Keywords :
corrosion testing; ground penetrating radar; nondestructive testing; reinforced concrete; sodium compounds; structural engineering computing; EKKO Mapper software packages; EKKO View Deluxe software packages; GFP Edit software packages; GPR data acquisition steps; GPR surveys; GPR wave velocity; NaCl; chloride contamination; concrete slab panels; corrosion effect; corrosion levels; corrosion time; destructive tests; frequency 1000 MHz; ground penetrating radar wave behavior; half-cell potential test; impedance current technique; lifetime evaluation; nondestructive testing method; pulse EKKO PRO system; reinforced concrete structures; reinforcement bar; size 100 mm; size 12 mm; size 300 mm; size 600 mm; time 24 hour; time 28 day; time 48 h; time 72 h; time 96 h; voltage 17.2 V; Corrosion; Indexes; Software; Steel; Visualization; Concrete; Corrosion; Ground Penetrating Radar; Impedance current; Non-destructive test;
Conference_Titel :
Ground Penetrating Radar (GPR), 2014 15th International Conference on
Conference_Location :
Brussels
DOI :
10.1109/ICGPR.2014.6970437