A Study of the Impact Resistance of Rubber Concrete at Low Temperatures (−30°C)

Table 8

Impact test results for the rubber concrete specimens at 25°C.

Specimen number	Initial crack impact time ()	Ultimate crack impact time ()	Ductility index	Impact energy (J)	Initial crack relative value (%)	Ultimate crack relative value (%)
NC-0.40	14	20	1.43	88.2	100	100
RC-20-5	25	38	1.52	167.6	178.6	190
RC-20-10	31	48	1.55	211.7	221.4	240
RC-20-15	40	63	1.58	277.8	285.7	315
RC-20-20	47	75	1.6	330.8	335.7	375
RC-50-5	21	31	1.48	136.7	150	155
RC-50-10	28	43	1.54	189.6	200	215
RC-50-15	35	55	1.57	242.6	250	275
RC-50-20	41	65	1.59	286.7	292.8	325