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

Table 16

Testing results of compressive strength about sprayed concrete.

Accelerator	Compressive strength of 28 days/MPa			Average strength/MPa	Compressive strength ratio of 28 days/%
Without adding accelerator	38.2; 39.9	37.7; 38.0	35.8; 37.7	37.9	100
WT-1 type accelerator	35.8; 32.0	31.2; 34.9	36.1; 32.9	33.8	89.2
GOR-I type accelerator	26.7; 30.1	27.4; 28.8	26.5; 27.5	27.8	73.5