Matters needing attention:The unused land and the surface treatment
1.The surface of concretes must be complete,pure and smooth.The parts above the concrets must be taken away and hollow place must be filled smoothly
2.Any white frost,pharmacies of eliminating of membrane,
,the concretes accelerator or other strange pollution must be eliminated.ALL of those must be finished before filling the hollow and the crack holes .
3.The water leakage or the seeping place must be filled to stop the wate