Fracture Characteristics of Polyurethane Grouting Materials Based on Acoustic Emission Monitoring

Table 3

Basic performance index of materials.

Serial number	Index
	Relative density	Gel time (s)	Curing time (min)	Expansion ratio	Compressive strength (MPa)
1	1.132	67	11	2.9	6.48
2	1.119	65	13	3.5	3.52
3	1.126	61	9	1.5	1.16
4	1.132	57	11	1.3	3.65
5	1.137	68	10	2.0	7.67
6	1.139	63	12	2.2	3.74
7	1.128	59	10	1.3	2.29
8	1.130	57	11	1.4	2.46
9	1.137	73	9	2.1	7.68
10	1.123	71	13	1.9	5.17
11	1.143	69	13	2.6	12.00
12	1.128	64	12	1.5	7.31
13	1.139	73	11	2.1	6.77
14	1.143	69	9	2.0	8.45
15	1.123	66	11	2.2	4.96
16	1.126	62	10	3.3	3.07