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

Table 9

Impact test results for the rubber concrete specimens at −30°C.

Specimen number	Initial crack impact time ()	Ultimate crack impact time ()	Ductility index	Impact energy (J)	Difference between the initial and ultimate cracks	Initial crack relative value (%)	Ultimate crack relative value (%)
NC-0.40	10	13	1.3	57.33	3	100	100
RC-20-5	20	30	1.49	132.3	10	200	230.8
RC-20-10	27	41	1.51	185.2	14	270	323.1
RC-20-15	32	50	1.56	220.5	18	320	384.6
RC-20-20	37	58	1.57	255.8	21	370	446.2
RC-50-5	19	27	1.42	119.1	8	190	207.7
RC-50-10	24	35	1.46	154.4	11	240	269.2
RC-50-15	30	45	1.5	198.5	15	300	346.2
RC-50-20	39	60	1.54	264.6	21	390	461.5