[6] [6] MA S H, LI W F, ZHANG S B, et al. Study on the hydration and microstructure of Portland cement containing diethanol- isopropanolamine［J］. Cem Concr Res, 2015, 67: 122-130.

[9] [9] HAN J, WANG K, SHI J, et al. Mechanism of triethanolamine on Portland cement hydration process and microstructure characteristics［J］. Constr Build Mater, 2015, 93: 457-462.

[14] [14] RENAN P S, SERGIO H P C, IGNACIO S, et al. Early-age hydration of cement pastes with alkaline and alkali-free accelerators for sprayed concrete［J］. Constr Build Mater, 2016, 111: 386-398.

[15] [15] TAN H B, LI M G, REN J, et al. Effect of aluminum sulfate on the hydration of tricalcium silicate［J］. Constr Build Mater, 2019, 205: 414-424.

[16] [16] YANG R H, HE T S, GUAN M Q, et al. Preparation and accelerating mechanism of aluminum sulfate-based alkali-free accelerating additive for sprayed concrete［J］. Constr Build Mater, 2020, 234: 117334.