Review Article
Microstructure Characteristics of GFRP Reinforcing Bars in Harsh Environment
Table 5
Summary of conditioning regimes in studies investigating the microstructure of GFRP reinforcing bars.
| Reference | Surrounding media | Conditioning | Loading | Alkaline | Concrete | Water | Seawater | Acidic | Duration (days) | Temperature (°C) | Yes (%, UTS1) | No |
| [7] | | | x | | | 40 to 120 | 23 to 80 | | x | [8] | x | | | | | 41.7 to 208.3 | 60 | | x | [9] | x | x | | | | 30 to 60 | −30 to 60 | | x | [10] | | x | | x | | 150 to 450 | 20 to 60 | | x | [11] | | x | | x | | 150 to 450 | 20 to 60 | 25 | | [12] | x | X | | | | Up to 1445 | – | 20–65 | | [13] | | | x | | | 60 to 180 | 23 to 50 | | x | [14] | | x | x | | | 60 to 240 | 23 to 50 | | x | [15] | x | | | | | 100 to 660 | 40 | | x | [23] | x | | | | | 41.67 to 208.33 | 22 to 60 | | x | [42] | | | | x | | 90 to 365 | 23 to 65 | | x | [24] | x | | | | | 90 | 60 | | x | [25] | | | x | | | 0.0208 to 0.1285 | −100 to 325 | | x | [26] | x | x | | | | 60 to 365 | 23 to 70 | | x | [27] | x | | | | | 30 to 180 | 23 to 60 | | x | [28] | x | | | | | 30 to 270 | 23 | 0–25 | | [29] | x | | x | x | x | 28 to 50 | 60 to 80 | | x | [30] | x | | x | x | | 180 to 540 | 23 to 50 | | x | [31] | x | | | | | 30 to 720 | 60 | | x | [32] | | x | | | | 0.0417 to 0.125 | 100 to 300 | | x | [33] | x | x | x | | | 90 to 730 | 60 | 20 & x2 | | [34] | | x | x | | | 60 to 240 | 23 to 50 | 20–80 | | [35] | x | | x | | | 30 to 120 | 20 to 73 | 19–29 | | [36] | x | | x | x | | 30 to 132 | −25 to 80 | | x | [37] | | x | x | x | | 180 to 540 | 23 to 50 | | x | [38] | | x2 | | | | 1825 to 2920 | −24 to 30 | x2 | | [39] | x | | | | | 30 to 365 | 23 to 75 | | x | [40] | x | | x | | | 54.2 | 22 to 90 | | x | [44] | x | x | | | | 21 to 42 | −18 to 49 | | x | [45] | x | | x | | | 15 to 60 | 60 | | x | [46] | x | | x | | | 42 to 365 | 20 to 60 | 15 | | [47] | | x | | | | 30 to 270 | 20 to 60 | 10–15 | | [48] | x | | | | | 30 to 180 | 60 | | x | [49] | x | | | | | 41.7 | 60 | | x | [50] | x | | | | | 20 to 120 | 20 to 70 | | x | [51] | | | x | x | | 41.7 | 20 to 70 | | x | [52] | x | x | x | | | 90 to 730 | 60 | 20 & x1 | |
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1Ultimate tensile strength. 2Natural weathering conditions.
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