Before polishing, you must first understand the detailed condition of the floor. This includes measuring the construction area, confirming the concrete grade, evaluating the floor flatness, and information on aggregate properties and potential adverse factors. Common adverse floor factors include pores, density, cracks, sand, honeycomb structure, and oil stains.
Rough grinding strategy and polishing pads selection
Based on the measurement results of the concrete floor flatness, the depth required for rough grinding can be estimated. At the same time, the appropriate rough grinding material is selected according to the hardness of the floor, and the best time to add the curing agent is determined.
Rough grinding process and machine selection
For poor concrete floor conditions, such as loose floors, delamination, oil stains or dust, or insufficient floor flatness, we need to use professional floor grinding machines for rough grinding. This step is to grind the floor to a solid base, while removing loose materials, oil stains and dust to ensure the flatness requirements of subsequent construction. When implementing rough grinding, we recommend using a grinding machine with more grinding heads because its grinding width is larger, which helps to improve flatness.
What to expect during rough grinding
During the coarse grinding process, scratches are easy to appear due to the large diamond particles in the abrasive. In addition, the grinding machine is too fast, the machine grinding head is not level, and the floor is not thoroughly cleaned, which are potential factors that cause scratches. If the scratches produced in the coarse grinding stage cannot be removed in the subsequent grinding, you can try to use the same mesh resin grinding disc to grind and remove them.
Fine grinding is an important link after coarse grinding. It involves further grinding of the floor, mainly using resin grinding discs from #200 grit to #800 grit. In this link, most floors will be coated with sealing curing agent.
Dry grinding VS. Wet grinding
In the field of traditional stone renovation and crystal surface crystallization, water grinding has always dominated. Its advantages are dust-free operation, easy cleaning, less auxiliary tool requirements, and lower abrasive costs and initial investment. However, water grinding also has shortcomings such as low efficiency, strong labor, easy sand marks and environmental pollution.
On the other hand, although the concrete curing floor technology is derived from stone grinding, it is different in actual application. Since concrete curing floor is often used for industrial floor, its construction area is wide and the site is open, so the dry grinding process equipped with large industrial vacuum cleaners has gradually become the mainstream.
Polish Stained Concrete Floors
After proper grinding, the floor has a good flatness and can be polished at this time. First, we use a grinder equipped with a 300-500 grit grinding disc for fine grinding, and then apply the sealant and ensure that it is fully absorbed. After the curing agent is absorbed, use #800 grit, #1500 grit and #3000 grit grinding discs in turn, and use a high-speed polisher for polishing. After these polishing steps, we can perform efficient sealant polishing on the concrete floor without exposing the aggregate.
