Development of a New Type of Alkali-Free Liquid Accelerator for Wet Shotcrete in Coal Mine and Its Engineering Application

Table 7

Experimental results of combination of Materials A and B.

Content of Material A/%	Content of Material B/%	Initial setting time/min	Final setting time/min	Compressive strength of one day/MPa	Compressive strength of 28 days/MPa	Compressive strength ratio of 28 days/%
0	0	195	258	7.8	43.9	100
55	0	90	162	9.1	37.8	86
	3	51	101	10.3	40.5	92
	3.5	29	79	10.7	41.1	94
	4	22	52	11.2	42.8	97
	4.5	24	59	10.3	44.0	100
	5	25	60	9.5	45.2	103