concrete bridge crack repair
bridge concrete crack repair compare: use QM type concrete repair material
Detailed repair process:
Concrete crack on bridge deck→Marking out→Joint-cutting→Chiseling→Cleaning
→Blowing→Mixing material→Repairing→Make surface flat→Check flatness→
Curing→Open to traffic
Advantage of QM concrete repair material:
1)Rapid repair,1 hour open traffic.
2)High compressive strength: 1h >25Mpa, 2h > 35Mpa, 1d > 60Mpa, 28d > 80Mpa.
3)High flexural strength: 1h > 5Mpa, 2h > 7.5Mpa, 1d > 10Mpa, 28d > 11Mpa.
4)Good adhesion property: adhesion drawing strength reaches to 2.8Mpa
5)Product toughness and impact resistance: 5-10 times of normal concrete.
6)Heat bilges cold shrink coefficient: basically same with grass-roots concrete
7)No shrinkage cracks: After solidification, there is no shrinkage cracks with original concrete.
8)Freezing resistance and slat-resistance: cold-resistant,resistance to sulfate corrosion,
non-toxic, non-corrosive.
QM concrete repair material testing data:
Test items | Unit | Technical requirement | Test result | Individual conclusion | |
Setting time | Initial setting | Min | ≥20 | 25 | Meet requirement |
Final setting | ≤60 | 35 | |||
Compressive strength | 2h | Mpa | ≥20 | 33.0 | Meet requirement |
1d | ≥40 | 66.1 | |||
28d | ≥50 | 90.5 | |||
Flexural strength | 2h | ≥4 | 5.5 | Meet requirement | |
1d | ≥6 | 10.5 | |||
28d | ≥8 | 13.5 | |||
Pulling strength | 28d | Mpa | ≥2.0 | 2.8 | Meet requirement |
Expansion rate | 28d | / | 0.00%-0.1% | 0.01% | Meet requirement |
QM concrete repair material also repairs for:
