1 Introduction
2 Experimental Programme
2.1 Material Properties
Specimen | Compressive strength (MPa) | Average | Tensile splitting strength (MPa) | Average | Modulus of elasticity (MPa) | Average | |
---|---|---|---|---|---|---|---|
Group 1 |
G1_2P
| 43.03 | 41.79 | 3.38 | 3.35 | 37,816 | 36,798 |
G1_P
| 41.40 | 3.67 | 37,241 | ||||
G1_SW
| 40.93 | 3.00 | 35,336 | ||||
Group 2 |
G2_2P
| 39.36 | 39.09 | 2.70 | 2.65 | 36,165 | 35,615 |
G2_SW
| 36.81 | 2.57 | 33,929 | ||||
G2_P
| 41,10 | 2,69 | 36,752 | ||||
Group 3 |
G3_SW
| 37.64 | 38.43 | 2.70 | 2.60 | 37,605 | 36,598 |
G3_P
| 38.55 | 2.62 | 35,204 | ||||
G3_2P
| 39.11 | 2.49 | 36,984 | ||||
Group uncorroded |
GR_2P
| 38.61 | 38.36 | 2.64 | 2.83 | 36,795 | 37,097 |
GR_P
| 38.28 | 2.67 | 36,825 | ||||
GR_SW
| 38.20 | 3.17 | 37,670 |
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GR, G1, G2, and G3 indicate different corrosion levels, from “reference” (uncorroded) to the most corroded, according to the accelerated corrosion setup shown in Sect. 2.3.
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SW, P, 2P indicate different dead load levels applied during the corrosion process; respectively, self-weight, load just below service design values and twice that load (over service design value).
Diameter (mm) | Yielding stress (MPa) | Ultimate stress (MPa) | ey (−) | eu (−) | Modulus of elasticity (MPa) |
---|---|---|---|---|---|
10 | 550 | 650 | 0.0025 | 0.11 | 200,000 |
12 | 545 | 643 | 0.0027 | 0.12 | 195,000 |
2.2 Description of Specimens
2.3 Accelerated Corrosion
2.4 Measurement Equipment
2.5 Loading Test Setup
2.6 Pull-Out Tests
3 Experimental Results
Specimen | Exposure time (days) | Steel loss (% top/bottom reinforcement) | Permanent load (kN) | Ultimate load (kN) | Loss of capacity (%) | |
---|---|---|---|---|---|---|
Group 1a |
G1_2P
| 56 | 6/14 | 16.50 | 24.50 | 29 |
G1_P
| 6/12 | 6.74 | 24.75 | 29 | ||
G1_SW
| 9/11 | 0.00 | 11.40 | 67 | ||
Group 2 |
G2_2P
| 42 | 6/15 | 17.70 | 25.75 | 26 |
G2_SW
| 6/10 | 0.00 | 21.00 | 39 | ||
G2_P
| 7/15 | 8.34 | 24.75 | 29 | ||
Group 3 |
G3_SW
| 100 | 15/15 | 0.00 | 21.80 | 37 |
G3_P
| 17/20 | 8.47 | 21.00 | 39 | ||
G3_2P
| 10/24 | 17.50 | 17.50b | 56 | ||
Group Uncorroded |
GR_2P
| – | –/– | 31.60 | – | |
GR_P
| 36.59 | – | ||||
GR_SW
| 36.42 | – |