Table 2 The T2 spectrum area change of the concrete sample after LN2 cold shock.
Number of cycles | Total area of spectrum | Change rate/% | First peak ratio/% | Second peak ratio/% | Third peak ratio/% | ||||
|---|---|---|---|---|---|---|---|---|---|
Original state | After the test | Original state | After the test | Original state | After the test | Original state | After the test | ||
Cold shock 5 min | |||||||||
1 | 966.96 | 1017.72 | 5.25 | 67.009 | 65.905 | 20.896 | 21.613 | 12.095 | 12.482 |
2 | 966.96 | 1048.43 | 8.43 | 67.009 | 65.118 | 20.896 | 21.847 | 12.095 | 13.035 |
3 | 966.96 | 1067.16 | 10.36 | 67.009 | 64.272 | 20.896 | 22.142 | 12.095 | 13.586 |
Cold shock 10 min | |||||||||
1 | 3248.27 | 3492.12 | 7.51 | 70.312 | 68.271 | 16.995 | 17.874 | 12.693 | 13.855 |
2 | 3248.27 | 3637.09 | 11.97 | 70.312 | 67.537 | 16.995 | 18.225 | 12.693 | 14.238 |
3 | 3248.27 | 3724.51 | 14.66 | 70.312 | 66.429 | 16.995 | 18.752 | 12.693 | 14.819 |