6 Annular Gap Grout
A cement-based mortar was used for grouting the annular gap for tunnelling the eastern section of the Tel Aviv Red Line . The mixes applied are presented in Table 1. The grout properties were tested in the lab at the WBI-Center.
The fresh mortar has a density of 2.1 g/cm³. Workability was proven by means of slump tests, in which horizontal slumps of roughly 50 to 60 cm could be achieved on up to 6 h old samples.
The deformability of the annular gap mortar in its fresh state is of decisive importance for dimensioning the segmental lining. Therefore, oedometer tests were...