An Experimental Study for Quantitative Estimation of Rebar Corrosion in Concrete Using Ground Penetrating Radar

Table 2

Amplitude corrosion relationships for 16 mm rebar.

Dielectric constant	Cover depth (mm)	Rebar corrosion area loss, (%), = maximum amplitude	Correlation coefficient	Measured mass loss; %	Predicted mass loss; %	% error
2.73	25		0.97	22; 31; 45	27; 28; 44	23; −10; −2
	50		0.98	22; 31; 45	26; 30; 43	18; −3; −4
	75		0.96	22; 31; 45	27; 29; 44	23; −6; −2
5.47	25		0.85	22; 31; 45	29; 36; 37	32; 16; −18
	50		0.87	22; 31; 45	31; 30; 39	41; −3; −13
	75		0.84	22; 31; 45	23; 20; 52	5; −35; 16
9.3	25		0.98	22; 31; 45	21; 34; 43	−5; 10; −4
	50		0.99	22; 31; 45	25; 29; 45	14; −6; 0
	75		0.99	22; 31; 45	25; 31; 43	14; 0; −4