PA
PROJECT SUMMARY
PA is formulated as a first fill grade tail sealant to be used on shielded tunnel boring machines(TBM).Together with the wire brushes, the sealant forms an impermeable barrier between the tail
shield of the TBM and the concrete segments to effectively seal off any ingress of water, soil and annulus grout/mortar back into the TBM invert.
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Case Details
DESCRIPTION
PA is formulated as a first fill grade tail sealant to be used on shielded tunnel boring machines(TBM).Together with the wire brushes, the sealant forms an impermeable barrier between the tail
shield of the TBM and the concrete segments to effectively seal off any ingress of water, soil and annulus grout/mortar back into the TBM invert.
Technical Data
| Items | Testing | Performance |
| Aspect | Cream with fiber | |
| Colour | White | |
| Density | ASTM D 1289 | 1.30±0.05(g/cm3) |
| Penetration | ASTM D 217 | 175-220(1/10mm) |
| Water pressure test | Matsumura | Pass at 35 bar |
| Flammability | Self-extinguishing |
KEY BENEFITS
● Excellent resistance to water;
● Easily and stably be settled into tail brush;
● Anti-washout and stable with fiber in cohesion;
● Self-extinguishing, not easy to ignite, less flowable and droppable under heating which to prevent fire risk when replace of tail brush.
● Biodegradable and safety.