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Table 4 Properties of the foaming agent

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

Items Index
Appearance Colorless transparent liquid
Water solubility Completely soluble
Density, 25 °C 1.01 ± 0.02 g/cm3
PH value 7–8
Foaming capacity (Ross–Miles) ≥220 mm