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Explanation of the blistering phenomenon of epoxy floor

发布日期:2019-09-28 点击:

东莞环氧地坪材料供应商

 Epoxy floor blisters occur on the first floor or basement, sometimes on the second floor or above. Epoxy floor blisters are usually found shortly after construction. Some epoxy pavements are laid in the afternoon. blister. The blister grows from small to large, and it develops to a certain extent and then stops. The higher the temperature, the easier it is for blisters to develop and the faster the rate of development. Blisters vary in shape and vary in size. Some blisters are more than 1m in diameter and 20~50mm in height. There is no obvious relationship between the generation of blisters and the construction area. Some of the same areas are serious, some are lighter and some are intact. In the same group operation, the epoxy floor layer of the same material construction, some blisters, some intact, indicating that blisters are caused by many factors. The cause of blisters is a problem that everyone cares about. When the blisters are cut open, the bubbles contain water or yellowish liquid. The epoxy floor layer is separated from the base layer, and the cement adhered to the base layer is drawn into a peak. "Physics" explains the relationship between the temperature and pressure of the three curves in a saturated state in a closed container filled with liquid. In a closed container, the pressure of saturated water vapor rises with increasing temperature. When the temperature is 20.C, the pressure inside the drum is 0.01 MPa; and when the temperature is between 70 and 80 °C It is a straight rise to 0.1 MPa; in many areas, the extreme radiant heat of the ground in the hot summer can reach 70.C. At such high temperatures, the epoxy adhesive has softened and the adhesive force is greatly reduced, so it gradually becomes the same in the tire. Like the air, the epoxy floor layer is bulged, and the glue is pulled into a honeycomb shape; some of the epoxy layer and the ground part without blisters are not firmly bonded, and the contact portion is carefully observed. There is a part that cannot be cured because the epoxy has moisture and cannot be cured; so where does the moisture come from? There are mainly the following sources of water:

1. The base layer, such as cement mortar leveling layer, has a maximum moisture content of about 12%, and the maximum water content of the base layer is larger than the leveling layer.
2. Dehydration in other ingredients in the epoxy is endless.
3. Epoxy and base layer construction does not combine well to leave voids and the chemical activity of the epoxy itself, not completely cured or in the presence of residues or gases that are not fully cured by moisture.
4. Moisture gas infiltrated underground in the basement.