send Baotou GRC The line keeps the moisture contained in it from evaporating in the early stage. The water contained in the product is used for hydration of cement and therefore develops its strength, reducing penetration and shrinkage.
Because hydration is affected by temperature, the surrounding air should be kept at a suitable temperature during the curing process of products.
1、 GRC Products are generally thin wall and low water cement ratio, while GRC clevis has a large surface area. Therefore, effective maintenance system shall be adopted to meet the following requirements:
a. Suitable early strength is available to facilitate demoulding and handling;
b. Ensure the design strength;
c. Shrinkage is limited to prevent cracking.
For the above ab points, curing can make the cement hydration proceed normally and enhance the strength and bonding. For c, volume loss, shrinkage, and cracking should be greatly reduced. To control water loss, in other words, adding water is the basic point of curing, and then adding temperature control.
2. In the actual implementation process, the maintenance can be divided into several stages and adopt different methods.
GRC component curing
2.1 Before and during demoulding
After finishing, the mold is usually wrapped with clean and refreshing polyethylene film, Baotou partition board This is to prevent the water contained in GRC from being evaporated, and also to help maintain the heat of hydration.
At the initial stage of curing, GRC products should have sufficient strength so that they will not be damaged during demoulding and handling.
2.2 Main maintenance
This main curing stage is to continue to protect the GRC products after demoulding. Generally, GRC products are still wrapped with plastic film to avoid water loss caused by sunlight. Local humidity can also be maintained by spraying wet fog.
2.3 Post curing
When Baotou EPS When the products are stored and used, and the surrounding environment is obviously different from the curing stage, it is necessary to take effective post curing. Some simple methods can be adopted to protect the components from direct sunlight during storage. The GRC shall reach the designed strength during storage, and the protection at this stage is to limit its drying shrinkage.
During the above curing process, the strength of GRC products can be further improved.
3. Accelerated curing is effective, including low-pressure steam curing and the use of chemical early strength agent.
3.1 Low pressure steam curing
In cold weather, this method is economical for mold turnover, and the temperature should not exceed 50 ℃, otherwise it is unfavorable for long-term strength.
3.2 Use of chemical early strength agent
This additive can mainly improve the early strength, is effective in cold conditions, and can make the products demould earlier.
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