Concrete diamond grinding speeds vary with floor surface hardness, depth of cut and coating type to be removed
A Situp diamond grinder will outperform any hand grinder by up to four times in an eight hour period in any of the above situations and is most often faster than single phase, walk behind grinders (USA excepted because they have high current single phase available).
The main reason for this large increase in diamond grinding speed is a reduction in physical fatigue and rest breaks.
Even a strong, experienced person has to take regular rest breaks while diamond grinding floors on their knees, but the frequency of breaks and the length of each break is much less when using a Situp Grinder resulting in huge time savings in a day.
The other factor determining how much concrete grinding is completed each hour is the efficiency of the grinder.
A Situp Grinder cuts 100% of the time while other stand up grinders can only cut approx. 50% of the time as the grinder is moved forward and then back again.
For more information about this go to Stand Up Edge Grinder where you can compare different grinders.
Concrete grinding with Situp Grinder is faster and easier.
Concrete grinding speeds with Situp Grinder
Floor grinder speeds will depend on the hardness of the concrete floor, the thickness of the coating, what diamond disc is fitted and how much needs to be taken off?
The best is around 300-400 sq.ft./hr (30-40 sq.m/hr) if you are experienced and if you are grinding normal strength concrete that only needs the surface cleaned up which is generally called ‘surface preparation’.
This is very fast for an angle grinder, especially a concrete edge grinder and normally only expected from machines that cost three times the price and use a lot more power.
Part of the reason is that a 9in (230mm) angle grinder is a very powerful motor with huge torque (unlike most walk behind grinders) that cannot be fully used when grinding from the kneeling position. The Situp kit enables an operator to put more effort into the grinding because of the leverage and mobile stool.
Surface Preparation speed
Normal surface preparation of concrete will be achieved at around 200 to 250 sq.ft/hr (20-30 sq.m/hr).
Removing thin epoxy will be a little slower than the above – around 150 to 250 sq.ft/hr. (15-25 sq.m/hr). For thicker epoxy up to 300 microns this may reduce to 70 sq.ft/hr. (7 sq.m./hr) using a conventional diamond cupwheel.
Acrylic paint removal – sealers, paving paint
Removing thick paving paint or acrylic coating (not epoxy) will take much longer. Speeds reduce to around 70 to 100 sq.ft/hr (7-10 sq.m/hr) or less because acrylic paints melt and become sticky which slows down the diamond grinding process.
These speeds can be doubled when a Tearitoff wheel is used.
Glue removal is similar to acrylic paint
For more information see Coatings Removal
Exposed Aggregate speeds
Exposing the aggregate requires deeper grinding that is not as fast as surface preparation and can vary between 30 and 60 sq.ft/hr (3-6sq.m/hr) for each pass if you choose the right diamond disc. It may require two or more passes to achieve the required depth.