Preparation and Performance of a New-Type Alkali-Free Liquid Accelerator for Shotcrete

Table 4

The adaption of accelerator to water reducing agent.

Type of water reducing agent	Content of water reducing agent/%	Water cement ratio	Initial setting time	Final setting time
Cement paste without water reducing agent	0	0.4	3 min	6 min 50 s
Naphthalene water reducing agent	0.8	0.4	3 min 50 s	7 min 48 s
		0.35	2 min 50 s	6 min 30 s
Polycarboxylic acid water reducing agent	0.75	0.4	4 min 10 s	8 min 5 s
		0.35	2 min 38 s	6 min 10 s