Influence of corrosion-based section loss on morphology and tensile capacity of pre-stressing strands

Figures & data

Table 1. Strand details.

Diameter (mm)	Nominal area (mm^2)	Nominal Weight (kg/m)	Minimum Breaking strength of the strand (kN)	Tensile strength (MPa)	Modulus of Elasticity (kN/mm^2)
12.7	98.7	0.775	183.7	1860	195

Figure 1. Electrochemical cell setup for accelerated corrosion.

Figure 2. Corrosion level classification in present study.

Figure 3. Rust deposition in low level of corrosion (Group A).

Figure 4. Surface erosion (shallow and wide).

Figure 5. Strand diameter measurement (post corrosion).

Table 2. Corrosion rates.

Group	No. of Specimens	Average Weight Loss ${\mathrm{W}}_{\mathrm{i}}-{\mathrm{W}}_{\mathrm{f}}$ (mg)	Percentage weight loss $\frac{{\mathrm{W}}_{\mathrm{i}}-{\mathrm{W}}_{\mathrm{f}}}{{\mathrm{W}}_{\mathrm{i}}}\times 100$(%)	Corrosion current (mA/cm^2)	Corrosion rate (mm/year)
A	3	6	0.1	0.2	0.02
B	3	10	0.16	0.3	0.03
C	3	18	0.29	0.6	0.07
D	3	30	0.5	1.0	0.11
E	3	40	0.65	1.4	0.15
F	3	51	0.83	1.7	0.20
G	3	62	1	2.1	0.24

Figure 6. Effect of corrosion current on corrosion rate.

Figure 7. Variation of corrosion rate and weight loss with respect to corrosion current.

Table 3. Descriptive statistics.

	N	Mean	SD	Sum	Min	Max
Weight loss	4	0.4	0.45461	1.6	0	1
Tensile strength	4	1576.4275	324.60934	6305.71	1112.46	1860

Table 4. Pearson correlations.

	Tensile strength
Weight loss	Pearson Corr.	−0.967
	p-value	0.033

Figure 8. Corroded strands (left to right) 1. Uncorroded, 2. Group a sample, 3. Group D sample, 4. Group G sample.

Figure 9. Outer wire after corrosion.

Figure 10. Tension test on strand.

Figure 11. Load deformation relation.

Figure 12. Relation between weight loss and tensile strength.

Figure 13. Group G specimen(Brittle failure) uncorroded sample (ductile failure).