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Table 2 The T2 spectrum area change of the concrete sample after LN2 cold shock.

From: Study on Deterioration Characteristics and Fracturing Mechanism of Concrete Under Liquid Nitrogen 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