Degradation Behavior of Concrete after Freeze-Thaw Cycles and Then Exposure to High Temperatures
Table 2
Details of the test specimens.
Group
Notation
Freeze-thaw cycles
Number of specimens
Exposure temperature (°C)
Exposure time (h)
Cooling method
Group 1
F0-T20W
0
3
20
3
Water
F0-T300W
0
3
300
3
Water
F0-T400W
0
3
400
3
Water
F0-T400A
0
3
400
3
Air
F0-T500W
0
3
500
3
Water
Group 2
F25-T20W
25
3
20
3
Water
F25-T300W
25
3
300
3
Water
F25-T400W
25
3
400
3
Water
F25-T400A
25
3
400
3
Air
F25-T500W
25
3
500
3
Water
Group 3
F35-T20W
35
3
20
3
Water
F35-T300W
35
3
300
3
Water
F35-T400W
35
3
400
3
Water
F35-T400A
35
3
400
3
Air
F35-T500W
35
3
500
3
Water
Group 4
F45-T20W
45
3
20
3
Water
F45-T300W
45
3
300
3
Water
F45-T400W
45
3
400
3
Water
F45-T400A
45
3
400
3
Air
F45-T500W
45
3
500
3
Water
Group 5
F55-T20W
55
3
20
3
Water
F55-T300W
55
3
300
3
Water
F55-T400W
55
3
400
3
Water
F55-T400A
55
3
400
3
Air
F55-T500W
55
3
500
3
Water
Note. “F#” denotes the freeze-thaw cycles (F0 = 0 cycles, F25 = 25 cycles, F35 = 35 cycles, F45 = 45 cycles, and F55 = 55 cycles); “T#” denotes the target temperature of high-temperature heating; “W” or “A” represents water- or air-cooling (natural cooling), respectively. For example, “F25-T400W” indicates that the specimen subjected to 400°C after 25 freeze-thaw cycles and then cooled by the water spray method.
