Cement concrete pavement fast thin layer repairing quality control and inspection points
Cement concrete pavement fast thin layer repairing quality control and inspection in addition to meet the requirements of cement concrete pavement general construction specification, also need to strengthen the management on the following four aspects:
1. The old concrete surface cut hair and clean up
Milling old concrete surface should be uniform, not disturbance or destroy the old concrete .Determination of concrete surface roughness, can use the method of sanding, number of measuring points in each 1oom long sections may not be less than 3.
In front of the paving of steel fiber reinforced concrete thin layer, cut hair should clean up the old concrete surface.Rough milling easy to stick on the surface of concrete laitance, dirt, these impurities will reduce the strength of new and old concrete bonding, influence repair effect.Using high pressure water cleaning the surface, should also be ruled out before paving water, steaming in the surface water.
2. The interface adhesive coating thickness
Interface adhesive coating thickness must be strictly controlled in the range of 0.5 to 1.5 mm.Therefore, on the one hand, to control the interface adhesive mixing proportion, make it has proper viscosity and degree of R and liquidity.On the other hand to in the process of coating operation, carefully and earnestly brush to prevent leakage.
3. Make besmear brush interface adhesive and paving thin layer interface
Interface adhesive coating thickness is very thin, moisture evaporates faster, besmear to brush immediately after pouring concrete repair thin layer, the interval control besmear to brush and pouring concrete should not be more than 20 minutes, in order to avoid caking agent , solidification, loss of bond capacity.In general, two process time interval less than 20 minutes.So, besmear brush interface adhesive and repair a thin layer to coordinate arrangements and continuous construction.
4. To do a good job of maintenance phase water, heat preservation
Cement concrete pavement fast thin layer repairing to maintenance phase water and insulation work.Because the concrete repair layer is very thin, has a very large specific surface area of concrete, the moisture in concrete are more likely to be lost, in addition to repair the thin layer of temperature sensitivity is also big, therefore construction of pavement immediately after spraying curing agent or covering plastic film, when the temperature change is big, should cover the content such as careless, in time to do a good job of water and heat preservation.
In addition, the construction time choice should also avoid the summer and winter, easy to choose in spring and autumn: in case of strong wind weather during construction and measures must be taken to prevent moisture loss.
