Ground Penetrating Radar (GPR) Corrosion Data (Wong, 2023)

Please refer to the article below:
Wong, P. T.-w., W. W.-l. Lai and C.-s. Poon (2023). "Classification of concrete corrosion states by GPR with machine learning." Construction and Building Materials. https://doi.org/10.1016/j.conbuildmat.2023.132855 (accepted)

Description of Data Set:
D2_0: Specimen D2, baseline, intact, Phase 1, GSSI SIR4000, 2 GHz
D2_1: Specimen D2, after exposure to 4% saline, Phase 2, GSSI SIR4000, 2 GHz
CEE_V_0: concrete wall at CEE/Castco, 50 mm cover, baseline, Phase 1, GSSI SIR20, 2 GHz
Korr1_0: Völker's specimen at BAM, 45 mm cover, baseline
F4_2: Specimen F4, during accelerated electrochemical corrosion, up to the day with hairline crack observed, Phase 2, GSSI SIR4000, 2 GHz
Mala_16_75: Lai's speciemn at BAM, 75 mm cover, baseline, Phase 1, Mala ProEx, 1.6 GHz
GSSI_26_75: Lai's speciemn at BAM, 75 mm cover, baseline, Phase 1, GSSI SIR20, 2.6 GHz
HKM_C1: HKM, field marine structure, delamination, Phase 3, GSSI SIR4000, 2 GHz
HKM_C3: HKM, field marine structure, internal crack, Phase 3, GSSI SIR4000, 2 GHz
NP_D: NP, field marine structure, delamination, Phase 3, GSSI SIR4000, 2 GHz
NP_SC: NP, field marine structure, minor surface crack, Phase 3, GSSI SIR4000, 2 GHz
TM1_C1: Upper deck of the Tuen Mun Wall, water seepage, Phase 2, GSSI SIR4000, 2 GHz
TM2_C5: Lower deck of the Tuen Mun Wall, normal, Phase 1, GSSI SIR4000, 2 GHz
TM2_C6: Lower deck of the Tuen Mun Wall, corroded, Phase 3, GSSI SIR4000, 2 GHz
TM2_C8: Lower deck of the Tuen Mun Wall, corroded and section loss, Phase 3, GSSI SIR4000, 2 GHz

Remark(s):
"GroupX, GroupXX, GroupXXX" stand for the group index for bias-variance decomposition of individual groups as assigned in the "Group" column