First, remove dust, milk skin, loose particles, etc. on the surface of the concrete. The treated surface should expose fresh concrete aggregate without disturbing the aggregate. Rinse it with pressurized water and air dry; sand blasting and concrete shot blasting machines should be used. , Concrete surface milling machine and other roughing methods or pressure water spraying, the roughing depth is controlled within 1～3mm. The surface of the concrete has local protrusions that exceed the plane, which should be smoothed with a smoothing machine; defects on the surface such as honeycomb and pitted surface must be cut off with a cutting machine; the cracks on the surface of the concrete must be chiseled to remove loose particles in the groove, and use a wire brush to remove The fragments and sand particles are removed, washed, dried, and then a thin layer of epoxy-based liquid is applied to the surface, and finally filled with epoxy mortar, and compacted and smoothed with a hot trowel. When the concrete strength of the backfilled part is not lower than the surrounding concrete strength, then roughen it.
Then the primer is aged for 20min～60min (based on three consecutive hand-touch drawing to 10mm break) before applying epoxy mortar. The paint should be mixed as soon as it is used. If it is already gelled, it should be discarded. If the primer loses its viscosity, it should be reapplied. The primer should be thin and uniform, without sag and bottom exposed; the epoxy resin construction should be carried out in the direction of the water flow, full section The application should be done in the order of the top surface, the side surface, the bottom surface and the top surface. The thickness of the epoxy mortar is 10mm, the error range is ±1.0mm, and the flatness requirement error range is ±5mm. At the same time, it is required to test the bond strength of the mortar coating and the foundation surface according to the specifications.
In addition, according to experts from China Epoxy Network (China Epoxy Industry Online) www.epoxy-e.cn, the coating curing period is 7 days. During the curing period, it is required to ensure the curing temperature, prevent water seepage, rain immersion, impact, etc.; When the area is constructed, the block construction method should be adopted. Each construction block can be 3~5m wide, and 30m~50mm gap joints are reserved between the construction blocks. After 1~3d epoxy mortar is cured, the gap joints should be filled to fill in the construction. It is required to be compacted and smoothed, and the construction surface should be kept flush with the construction blocks on both sides, without misalignment and no obvious joints.
Before construction, fix the thickness scale on the edge of the construction block, and then apply epoxy mortar. During construction, apply, compact, and level. After the epoxy mortar is applied, it will be lifted after 30-60 minutes. Sizing and finishing: After the coating is lifted and finished, the surface should be dense and smooth, and there should be no obvious overlap marks, falling, cracks, blistering, pitting, etc. If it is found, it should be dealt with in time, and severe cases must be removed Re-wiping; the construction joints in the construction should be at 45° to the horizontal plane. When re-construction, the inclined surface should be cleaned and the primer should be applied. The mortar at the joints should be compacted and smoothed to avoid cold joints. Stubble.