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Table 12 Market prices of the A-liquids of different mix ratios in China

From: Use of a 10.22 m diameter EPB shield: a case study in Beijing subway construction

Materials Water Cement Slurry Retarder SG IST (s) TP (¥/m3) Evaluation
1
 Mix ratio 1 1 0.3 0.013 1.32 16 209.75 The most reasonable
 Mass (kg) 571 + 157.6 571 171.3 7.423     
  728.6   13.7      
 Price (¥) 4.4 179.9 6.85 18.6     
2
 Mix ratio 1 0.9 0.3 0.01 1.27 35 188.64 Merits: low price; defects: long setting time and unfit for construction
 Changed Mix ratio 1.11 1 0.33 0.0111     
 Mass (kg) 574.7 + 158.6 517.19 172.40 5.747     
  733.3   13.8      
 Price (¥) 4.47 162.9 6.9 14.37     
3
 Mix ratio 1 0.9 0.2 0.008 1.29 20 195.06 Merits: low price; defects: long setting time and unfit for construction
 Changed Mix ratio 1.11 1 0.22 0.009     
 Mass (kg) 611.95 + 112.6 550.76 122.39 4.896     
  724.6   9.79      
 Price (¥) 4.42 173.5 4.9 12.24     
4
 Mix ratio 1 0.8 0.2 0.008 1.24 36 177.37 Merits: low price; defects: long setting time and unfit for construction
 Changed Mix ratio 1.25 1 0.25 0.01     
 Mass (kg) 617.53 + 113.63 494.02 123.51 4.94     
  731.16   9.88      
 Price (¥) 4.46 155.62 4.94 12.35     
  1. SG specific gravity, IST initial setting time, TP total price