On a fresh pour the clock, not the mix, is the enemy. Concrete shrinks as it cures and it is going to crack somewhere; the whole point of sawing control joints is to decide where. Miss the window and the slab makes that decision for you, and a random crack across a new driveway or warehouse floor is not something you can sand out. The MK-610W is MK Diamond's Supreme Grade green concrete blade, built for the crew that has to get joints in early, while the concrete is still soft and abrasive enough to destroy a blade meant for cured slabs.
Use Cases
- Sawing control and contraction joints in a freshly placed slab before it cracks on its own
- Driveways, sidewalks and flatwork where the joint pattern has to go in the same day
- Warehouse and commercial floor slabs that need a wide, clean joint for sealant
- Parking decks and slab-on-grade pours on a tight finishing schedule
- Any pour where the crew has one short window between too soft and too late
Built for the green window
Green concrete behaves like a grinding compound. The paste has not hardened, the aggregate is not fully locked in, and everything coming out of the kerf is abrasive. That chews through a bond formulated for cured concrete. The MK-610W is bonded the other direction - hard enough to survive an abrasive cut - and MK rates it for saws from 8 to 20 horsepower, the walk-behind class most flatwork crews run. Segments are laser welded and stand 12mm tall, so there is a long working life in the blade before it needs replacing.
Reading the slab
Experienced finishers describe the same routine: watch the surface, run a scratch test, then make a short test cut at the edge. A cut that ravels or pulls stones means the slab is still too soft - wait and try again. A cut that comes out with clean shoulders means you are in the window, and from there it is a race to get the whole joint pattern in. Cool weather widens that window; hot, windy days shrink it hard. Keep the water running the whole time, both to cool the blade and to keep the fine slurry from packing into the kerf.
Specifications
- Manufacturer: MK Diamond Products
- Model: MK-610W
- Part number: 150249
- Grade: Supreme Grade
- Application: Green concrete, wet cutting
- Blade diameter: 12 in. (305mm)
- Blade width (kerf): .187 in.
- Arbor: 1 in.
- Segment height: 12mm
- Segment attachment: Laser welded
- Saw horsepower range: 8 to 20 hp
Frequently asked questions
When should I cut control joints in a new slab?
Green concrete sawing is a timing job, not a strength job. Crews generally open the joints within a few hours of finishing - commonly a window of roughly four to twelve hours, stretching longer in cool weather. Cut too early and the blade ravels the edge and pulls aggregate; wait too long and the slab picks its own crack.
How do I know the slab is ready?
The usual field check is a scratch test: the surface should be firm enough to carry the saw without scarring, and a test cut should come out clean rather than ragged along the edges. If the cut ravels, give it more time and try again.
Why run this blade wet?
Water cools the blade and carries the slurry out of the kerf, and it holds down the dust that dry sawing produces. MK Diamond lists the MK-610W among its wet cutting green concrete blades.
What does the .187 in. width get me?
A .187 in. kerf opens a wider joint than a standard .125 in. blade in a single pass, which suits joints that will take sealant or backer rod, and the extra thickness gives the blade more lateral stability in soft, green concrete.
Will this blade work on cured concrete too?
It is bonded for green concrete, which is soft and abrasive, and that bond is not the right match for hard cured slabs - it will wear quickly there. MK builds separate cured concrete blades for that work.
Discount Cleaning Products is an authorized MK Diamond dealer. MK Diamond Products builds its saws, blades and diamond tooling out of Torrance, California, and US-based product support stands behind the line. If you are not sure which width or arbor matches your saw, contact us before you order and we will match the blade to the machine.
