Concrete curing methods: natural curing method, health solution method, curing film method, full water method.
1. Natural conservation
During the curing of the concrete belt bai mold, measures such as belt mold wrapping, watering, spraying water and other measures should be adopted for moisturizing and damp maintenance to ensure that the joints of the formwork will not lose water and dry. In order to ensure smooth mold removal, you can slightly loosen the formwork 24 to 48 hours after the concrete is poured, and continue watering and curing until the mold is removed and then moisturizing to the specified age.
After removing the surface covering or demoulding of the concrete, the concrete should be cured by water storage, watering or covering and sprinkling. It can also be quickly covered with linen cloth, straw curtain and other materials when the concrete surface is wet. Or wrap, and then wrap moisturizing materials such as linen cloth or straw curtain with plastic cloth or canvas.
During the coating period, the coating should be intact, overlap each other intact, and the inner surface should have condensation water. In conditions where conditions permit, the time for concrete covering and moisture conservation should be extended as much as possible.
2. Health liquid method
The spraying film curing solution is suitable for special-shaped or large-area concrete structures that are not easy to be sprayed for curing. It uses a spray gun to spray the perchlorovinyl resin solution on the surface of the concrete. After the solution evaporates, a plastic film is formed on the surface of the concrete to isolate the concrete from the air and prevent the evaporation of water to ensure the normal progress of hydration.
Some films will age and fall off after curing, otherwise it is not suitable to spray on the concrete surface to be painted later. In summer, sun protection is required after the film is formed, otherwise cracks will easily occur. When the concrete is cured with spray curing liquid, it should be ensured that the spray does not leak.
Gray curing agents or clear materials are generally used to maintain long-term exposed concrete surfaces. The color of gray curing agent is close to the color of concrete, and it also has the effect of whitewashing and adding color to the surface. In the later stage of weathering, its appearance is much better than using white curing agent. The clear curing agent is a transparent material, which cannot whitewash concrete, but can only maintain the original appearance.
3. Curing film
The concrete water-saving and moisturizing curing film is made of a new type of controllable polymer material as the core, plastic film as the carrier, and adhesive compound. The polymer material can absorb 200 times of its own weight of water, and becomes a transparent lens after absorbing water. Turn liquid water into solid water, and then through capillary action, it continuously penetrates to the curing surface.
At the same time, it continuously absorbs the evaporated water of the curing body in the process of concrete hydration heat. Therefore, during a curing period, the curing film can ensure that the surface of the curing body remains moist, and the relative humidity is greater than or equal to 90%, which can effectively inhibit micro-cracks and ensure the quality of the project.
4. Full water method
Nine-ply strips (100mm wide) with a thickness of 12mm or more are used to lap the edges of the cast-in-situ slab during the process of pouring and pounding the concrete slab, and fix it with two 35mm long iron nails per meter; stair steps and The height of the cast-in-place slab is also covered with slabs. The stair step slabs are required to be flat and the step height difference is less than 3mm; when the concrete slab is large, it should be cured in blocks according to the pouring time and plane size.
The boundary is also pave with 100mm wide nine-ply slats; the slats must be laid flat and close to the edge; after the concrete is poured, it should be smoothed with a rough wood crab in time, and cured in time, especially in the summer before the high temperature and initial setting. , And the thick crab is smoothed twice, and the water-filled method is used before the final setting (that is, a flat plate such as a three plywood is laid on the surface of the board.
The water flows to the concrete surface through the slab surface until it overflows the slats). Curing for 3d～7d. The curing time should be extended if the conditions allow; during the curing period, the concrete should not be moved; the stair treads should be cancelled after the concrete strength reaches 100%.
The quality of concrete curing directly determines the microscopic properties of concrete materials. If the early curing is appropriate, the later concrete density is high, the total void ratio is low, and the pore content is reduced, so reasonable curing will significantly improve the early performance of concrete.
Such as strength and permeability resistance. Temperature, humidity, curing time, etc. are the main control parameters in the curing process of concrete materials. Sufficient moisture, appropriate temperature and necessary curing time are important guarantees for achieving concrete durability.
Most of the cracks produced in concrete structures are caused by deformation. The main causes of deformation are humidity, temperature and uneven settlement, among which the cracks caused by humidity and temperature changes account for the main part.
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