Rapid repair mortar for thin layer cement concrete pavement concrete repair mortar

Repair mortar is a kind of special cement-based polymer mortar for surface defects and reinforcement of concrete structures.

Construction steps of repairing mortar.
1. Treatment of concrete base surface to be repaired.
1.1 loose animals, oil, paint and other sundries to be repaired on the concrete base must be removed.
1.2 the sand or freeze-thaw concrete base surface to be repaired shall remove all the damaged parts of the base surface until a solid foundation surface is exposed.
1.3 the protruding part of concrete base surface is flattened.
1.4 crack treatment of concrete base.
A V-shaped groove is opened along the crack with the depth of 50mm and the width of the upper mouth around 70mm, which is repaired in advance with this mortar, and a reinforced net is laid on the top surface to start the lower part of the operation after it hardens.

2.The compressive strength of concrete base surface to be repaired should not be less than 20MPa, and the compressive strength of concrete base surface to be repaired for heavy-duty pavement should not be less than 30MPa.
When repairing the base surface of newly poured concrete, the age of newly poured concrete is more than 28 days for those using Portland cement and more than 14 days for those using sulphoaluminate cement.
3. The proposed repair concrete base surface is cleaned and maintained with water for 1 hour (so that the concrete base surface can fully absorb water), but there is no open water when paving and repairing mortar.
4. No interfacial agent of any kind shall be applied on the base surface of the concrete to be repaired.
5. This material should be added strictly according to the water-to-material ratio specified in the inspection report, otherwise the operation performance of the repair mortar will be inconsistent and the color will be different.
Cause, intensity fluctuation.
Stir by machine, not by hand.
6. When the thin layer of this material is repaired, the layer-by-layer pressure method is used and the repair thickness is 5-12mm.
7. The suitable working time of this material after mixing with water is about 20 minutes at room temperature, and the damaged mixed material should be used up within 20 minutes; when the material is not used up within that time, the material shall not be mixed and reused again.
8. The repair material should be layered and pressed, and the last layer should be flattened at once, and then plucked when required.
9. Maintenance.
The repair layer is very thin, the specific surface area of the mixed soil is very large, and the moisture in the repair material is easy to be lost, such as sun exposure under adverse environmental conditions.
Under strong wind and other weather conditions, covering and curing should be carried out after flattening. Watering or covering plastic film after hardening will make the hydration reaction of this material more sufficient and the strength higher.

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