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Table 11 Test results of the A-liquid

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

Place of origin of the sodium bentonite Mix ratio of the A-liquid in mass Density (g/cm3) Funnel discharge time (s)
Water Cement Retarder Concentration of the bentonite slurry
8% 9%
Weifang of Shandong Province, red appearance 1 1 0.016 3.52   1.16 38.37
1 1 0.016   3.13 1.19 115
Chengde of Hebei Province, yellowish white appearance 1 1 0.016 3.52   1.19 37.66
1 1 0.016   3.13 1.20 65.84