Investigations of Dynamic Mechanical Performance of Rubber Concrete under Freeze-Thaw Cycle Damage

Table 2

Longitudinal wave velocity of specimen under freeze-thaw cycle.

Number	Specimen height L (mm)	Initial sound time value (μs)	Measured sound time value (μs)	Wave speed (m·s^−1)	Average (m·s^−1)	D
XJ-0-1	99.8	3.2	31.8	3490	3552	0
XJ-0-2	100.3	3.2	31.4	3557
XJ-0-3	100.3	3.2	31.0	3608
XJ-25-1	99.73	3.2	34.8	3156	3215	0.095
XJ-25-2	101.14	3.2	34.0	3284
XJ-25-3	99.13	3.2	34.2	3204
XJ-50-1	100.59	3.2	37.0	2891	2979	0.161
XJ-50-2	98.74	3.2	36.8	2939
XJ-50-3	100.06	3.2	35.4	3107
XJ-75-1	99.37	3.2	37.8	2872	2826	0.204
XJ-75-2	98.89	3.2	38.4	2809
XJ-75-3	100.42	3.2	39.2	2798
XJ-100-1	99.26	3.2	39.2	2757	2722	0.234
XJ-100-2	99.42	3.2	39.8	2716
XJ-100-3	100.21	3.2	40.4	2694
XJ-125-1	99.46	3.2	38.6	2710	2673	0.247
XJ-125-2	99.42	3.2	40.4	2673
XJ-125-3	101.21	3.2	41.6	2636

Note. XJ-0-1 in XJ means rubber concrete, 0 means the number of freeze-thaw cycles is 0, 1 means the test piece number is 1.