1. For cracks on the surface of general concrete floor, the cracks can be cleaned first, and then filled with epoxy resin liquid or closed by surface painting after drying. If cracks are found before final setting during construction, they can be treated with plastering.
2. For the treatment of other general cracks (the width is between 0.05 mm and 0.2 mm), the construction sequence is as follows: after the slab joints are cleaned, they shall be leveled and maintained with 1: 2 or1:kloc-0/cement mortar, and sealed to restore the look and feel. (Limited to a few short and non-penetrating joints)
3. When the crack (width greater than 0.2mm) is large, a splayed groove should be chiseled along the crack. After cleaning, smooth it with 1: 2 cement mortar, or repair it with epoxy putty. (Limited to a few short and non-penetrating joints)
4. When there are large cracks in the floor, static load test should be carried out on the floor to check its structural safety. If necessary, a layer of steel wire mesh can be added to the floor to improve the integrity of the floor. Or seal the board with epoxy resin liquid (waterproof layer is also acceptable), and stick carbon fiber cloth at the bottom of the board into a well shape with equal spacing and width.
5. For the long and penetrating dangerous structural cracks with the crack width greater than 0.2mm, the treatment method is also: in addition to flushing the V-groove along the joint, epoxy resin liquid is injected into the joint under pressure to seal it, and measures such as sticking flat steel or carbon fiber cloth are adopted to reinforce the floor. When strengthening with carbon fiber cloth, for a single crack, in addition to sticking along the seam, it is necessary to expand the width at intervals perpendicular to the direction of the seam; For multiple intersecting seams, paste them into a hash shape with the same spacing and width. (The width of the cloth is about 300 mm)
6. When the through length, through length and non-through length and the number of through cracks are the same, the bottom of the board is only pasted vertically and horizontally. The above is the detailed information of floor crack treatment and concrete cast-in-place floor crack.