Because we often decorate large area of workshop epoxy floor, our company has accumulated a lot of construction experience, so we also have some methods for how to deal with expansion joints. These construction schemes are listed for your reference today. No matter how good the material quality of the epoxy floor coating is, after one year, the epoxy floor coating will crack if the original concrete floor cracks. Therefore, it is more necessary to handle the expansion joint well. To avoid engineering quality disputes. As we all know, the effect of epoxy floor is seamless. Therefore, in the construction of epoxy floor, it is necessary to deal with some expansion joints of concrete floor.
1. Fill expansion joints with epoxy mortar material, and then proceed with the construction according to the original scheme we designed for our customers.
However, this method can not ensure that cracking and shelling do not occur in the floor coating at or near the expansion joint. Because the epoxy mortar material is inelastic, it can not resist the stress of concrete shrinkage cracking, and finally it can not avoid ground cracking.
2. After the epoxy floor is finished, the expansion joint of 2-5mm width is cut out with the cutting machine at the original expansion joint position, and the debris in the joint is cleaned up. Then the expansion joint is filled with elastic material (such as polyurethane elastomer). In this process, attention should be paid to avoiding the contamination of rubber outside the joint. Finally, the coatings and topcoats in epoxy resin are coated.
The filling of elastomeric adhesives needs a certain depth, otherwise it is easy to appear that the elastomeric adhesives are not firmly attached to concrete and separate from it.
Compared with the first method, because elastomer disperses the stress caused by shrinkage of concrete, the possibility of cracking of the coating on expansion joint is greatly reduced, and the overall color of the ground is the same, but because the coating on elastomer is still rigid, when the shrinkage of concrete is more intense, the floor coating on elastomer (middle). Coatings and topcoats) may crack, but cracks will not be large.
3. During the construction of the floor, the expansion joints should be kept as far as possible, covered immediately, and the location should be recorded. After finishing the painting of the floor, the expansion joints should be cut and trimmed to ensure that the width is more than 5 mm. It is better to decorate them into ladder shapes with narrow upper width and lower width. Then the dust and debris in the joints should be cleaned up, and the two sides of the joints should be affixed. The tape is filled with polyurethane elastomer until it is flat, and the tape is torn off when the elastomer is in semi-dry state.
The third method is often used in electronic and pharmaceutical factories with high requirements of cleanliness and aesthetics, which can basically avoid the cracking of floor coating at expansion joints and make the floor more beautiful. The disadvantage of this method is that polyurethane elastomer has less color and is not easy to achieve the same color as the whole floor coating.
4. Local ground expansion joints are often covered with fiberglass cloth to enhance crack resistance. The construction method is: first fill the expansion joints with epoxy mortar material, then coat the bottom coating material, then paste 1-2 channels of fiberglass cloth with width of about 10 mm, and then roll coating materials, surface coating, etc.
This method can not only ensure that the overall color of the ground is the same, but also resist the cracking caused by concrete shrinkage. But if the design thickness of the floor coating is too thin, it is difficult to operate, and it is easy to appear that the ground is higher than other places. Therefore, the epoxy floor with at least 2MM or more will adopt this scheme.
Generally speaking, the treatment of expansion joints on the ground should be paid great attention by the construction party and Party A. As for which plan to adopt, the specific situation on the ground needs to be consulted with Party A and decided unanimously.
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