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

Table 1

Properties of Portland cement.

Indexes	Standard requirement	Jidong cement	Qinling cement
Fineness/%	≤10.0	≤5.0	≤5.0
Initial setting time/min	≥45	195	205
Final setting time/min	≤390	238	250
Soundness/mm	≤5	0.8	1.2
3 d compressive strength/MPa	≥21	26.8	30.8
28 d compressive strength/MPa	≥42.5	45.3	50.8
3 d flexural strength/MPa	≥4.0	5.7	5.5
28 d flexural strength/MPa	≥6.5	7.9	8.8