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

Table 9

Orthogonal test proposal.

Test number	Content of Material A/%	Content of Material B/%	Content of Material C/%
1	50	3.5	2
2	50	4	2.5
3	50	4.5	3
4	55	3.5	2.5
5	55	4	3
6	55	4.5	2
7	60	3.5	3
8	60	4	2
9	60	4.5	2.5