How to Grind and Smooth Concrete with an Angle Grinder


how to grind smooth concrete with grinder

Concrete is a popular and necessary surface mixture that provides decades of a durable surface with only a few mixing and spreading techniques. The problem comes when air bubbles and rough ridges form on the surface that is a contractor’s worst nightmare. Are there any tools worth using to smooth out and polish a concrete floor?

How to grind and smooth concrete with an angle grinder: An angle grinder is a perfect tool for grinding concrete and smoothing out edges. When determining how to grind concrete with angle grinder blades, a wet angle grinder is the best type of angle grinder to use. Make sure to equip a dust shroud and begin moving around the surface of the concrete.

This article will explore a range of products and accessories that are necessary for grinding and smoothing out concrete. Additionally, we will also explain how to grind and smooth concrete in a step by step guide and other related questions to the process.

Best Products for Grinding and Smoothing Concrete

Stadea CDW205H Concrete Grinding Wheel: (Editor’s #1 Pick)

Stadea CWD205H Concrete Grinding Wheel 7 Inch Double Row Diamond Cup Grinding Grinder Wheels Disc for Concrete Masonry Stone Granite Grinding
  • DESIGNED FOR CONCRETE MASONRY ROCK - Stadea 7" Double Row diamond cup grinding wheel designed for grinding Concrete masonry, rock. Works great on Concrete Masonry rock stone surfaces
  • EFFICIENT, SAVES LABOR COST - Diamond Concrete Grinder Wheel with larger grinding diamond segments exposes more surface to diamond segments for faster cutting. Professional grade diamond for extra grinding per rotation. Very effective, efficient and time saver for surface grinding of concrete masonry surface or floor,
  • DURABLE, A GREAT VALUE TOOL - Heat treated body for strong body, better quality diamond matrix for longer life. Concrete grinding wheel 4 1/2 performs faster and lasts longer on surface preparation of concrete masonry rocks
  • EFFECTIVE ON VARIETY OF SURFACES - Concrete masonry grinding wheel that works equally good on stone rocks surface preparation
  • WHEEL FOR POLISHER & GRINDERS - Cup wheel with 5/8" 11 female thread, connects seamlessly to polishers and grinders

Concrete is incredibly dusty and contains many harmful particles that can cause damage to the lungs; therefore, a concrete grinding wheel is necessary as an attachment to your grinder for concrete work. The Stadea CDW205H is designed for dry grinding sanding of concrete or other hard surfaces.

It has a 5/8″ 11″ threaded arbor to connect to grinders. This product is recommended to use with a dust shroud to minimize the dust exposure. With aggressive double row diamond segments, this product will deliver expert grinding and smoothing simultaneously.

stadea CDW 205H for grinding concrete

Additionally, the cup wheel has thick turbo diamond segments for enhanced product life and quick grinding. This is our number one pick due to the absolute necessity of having this accessory for concrete grinding and smoothing.

Pros:

  • Works great on Concrete Masonry rock stone surfaces
  • Diamond Concrete Grinder Wheel with larger grinding diamond segments exposes more surface to diamond segments for faster cutting. Professional grade diamond for extra grinding per rotation.
  • Very effective, efficient, and time saver for surface grinding of concrete masonry surface or floor,
  • The heat-treated body makes for a strong body and better quality diamond matrix for longer life. Concrete grinding wheel 4 1/2 performs faster and lasts longer on surface preparation of concrete masonry rocks
  • Concrete masonry grinding wheel that works equally good on stone rocks surface preparation
  • Cup wheel with 5/8″ 11 female thread, connects seamlessly to polishers and grinders

Cons:

  • Connecting clamps can be difficult to latch based on the type of angle grinder

HERZO Universal Surface Grinding Dust Shroud:

HERZO Universal Surface Grinding Dust Shroud for Angle Grinder 7- Inch
  • Adapt To Many Brand:Suitable for Bosch,Makita ,Dewalt,Kress,Milwaukee Etc 80% Main Brand 7inch/180MM Angle Grinder.And the best choice for 7 inch Double Row Diamond Cup Wheel.
  • Durable Materails:This shroud is made by high quality PVC and Nylon to make sure it’s long working time along with the light weight.
  • Easy Use: This shroud is designed for easy install and use.And we also provide you with an operation manual to help you.
  • Brush Ring Keeps Dust Away: Dust shroud is surrended with the brush rings to ensure keep dust away.
  • Tips:This shroud do not fit which height more than 4cm/1.6'' diamond grinding cup wheel.

Equally important as a proper concrete grinding wheel is a dust shroud, which will help to prevent the massive amounts of concrete from flying all across the room. This accessory is suitable for all major brands with 7inch/180mm angle grinders such as BOSCH, MAKITA, DEWALT, METABO, etc.

It is lighter than other similar products and can collect the dust during the working time and give you a no-dust working environment. In addition, it is easy to use and wash and attaches with ease to an applicable angle grinder of your choice.

It is important to note that this shroud can fit about 80% of most major brand 7-inch angle grinders–but it does not mean it can cover all kinds of diamond grinding cup wheels. Thankfully, if the shroud does not fit, a full refund will be granted, but to save time, always follow the exact measurements of your grinder.

Pros:

  • Adapts to many brands, including Bosch, Makita, Dewalt, Kress, and Milwaukee
  • This shroud is made by high-quality PVC and Nylon to make sure it’s long working time along with the lightweight.
  • This shroud is designed for easy install and use and includes a detailed manual for guidance
  • This dust shroud is surrounded by brush rings to ensure dust is kept away.

Cons:

  • This shroud does not fit which height more than 4cm/1.6”

DEWALT 7-Inch Angle Grinder Tool:

DEWALT Angle Grinder Tool, 7-Inch, 13-Amp (DW840),Yellow,Medium
  • 13.0 Amp AC/DC, 8,000 rpm motor provides high power and speed for 7-inch grinding applications
  • High power-to-weight ratio for greater efficiency and reduced user fatigue
  • Keyless adjustable guard provides tool-free guard adjustments, increasing productivity
  • Rear handle design for greater comfort and control
  • External brush caps for easy servicing Sealed ball and roller bearings for extended motor life

Now, let’s talk about appropriate angle grinders when it comes to grinding and smoothing out concrete. The DEWALT 7-inch medium angle grinder is a compact yet powerful grinding tool offering 13.0 amps of power at speeds of up to 8,000 RPM.

This heavy-duty tool features a rear-handle grip area for better control and comfort and an adjustable keyless guard that can be easily moved to a preferred position, along with a spindle lock that makes changing wheels quick and easy. Other features include sealed ball and roller bearings to prevent debris from entering, external brush doors for easy access during servicing, and a two-position side handles for optimal control.

Grinders for concrete need to be able to grind and smooth with great effect, and this model is certain to get the job done.

Pros:

  • 13.0 Amp AC/DC, 8,000 rpm motor provides high power and speed for 7-inch grinding applications
  • The high power-to-weight ratio is great for greater efficiency and reduced user fatigue
  • The keyless adjustable guard provides tool-free guard adjustments, increasing productivity
  • Rear handle design for greater comfort and control
  • External brush caps for easy servicing
  • Sealed ball and roller bearings for extended motor life

Cons:

  • Arbor can be too close to the gear head
  • Gearbox can overheat

DEWALT Dry or Wet Cutting Diamond Blade:

DEWALT Diamond Blade, Dry or Wet Cutting, Continuous Rim, 7/8-Inch Arbor, 4-1/2-Inch (DW4701)
  • Extended performance diamond matrix provides 350 times the life of conventional abrasives
  • Ideal addition to 4-to-4-1/2-inch grinders
  • Continuous rim turbo design provides optimal use in brick, block, and tile
  • Large diamond segments with cobalt ideal for use across various product applications
  • Works with concrete, stone, granite, brick, and tile

Let’s talk about proper blades; strength and durability for both the heavy-duty thickness of the concrete and the wet mass of debris are key. The DEWALT DW4701 is a great addition to your 4-to-4-1/2-inch grinders.

With an advanced diamond matrix, this blade provides longer life and improved grinder application. It’s designed for consistency, with a straight and dependable depth of cut and a greater life span by 100 times more than the industry standard.

Make sure to use this blade on a variety of tough applications, including concrete, stone, granite, brick, and tile. It measures 4-1/2-inches in diameter with a 5/8-inch and 7/8-inch arbor.

It’s important to point out that this grinder accessory must be used with the DW4705 4-inch or 4-1/2-inch guard and the DW4717 4-inch flange or DW4706 4-1/2-inch flange. When it comes to grinding concrete, this blade is truly one of the best.

Pros:

  • Extended performance diamond matrix provides 350 times the life of conventional abrasives
  • An ideal addition to 4-to-4-1/2-inch grinders
  • Continuous rim turbo design provides optimal use in brick, block, and tile
  • Large diamond segments with cobalt ideal for use across various product applications
  • Works with concrete, stone, granite, brick, and tile

Cons:

  • The blade can wear down easily with extended use
  • Easily chips concrete

DEWALT Grinding Wheel:

DEWALT Grinding Wheel, Double Row, Diamond Cup, 4-1/2-Inch (DW4774)
  • Extended performance diamond matrix provides 350x's the life of conventional abrasives and aggressive material removal
  • Large Grinding segments with heat treated steel bodies which provides increases durability and wheel life

Like the Satdea grinding wheel, DEWALT Diamond Cup Wheels are designed to be used for dry grinding of concrete and other masonry materials to smooth uneven surfaces and remove flashing. The diamond matrix on this model provides 350x’s the life of conventional abrasives and allows for more aggressive material removal.

Additionally, a double row of diamond rims on these blades provides for heavy material removal and provides longer life. This 4 1/2″ wheel with double rim and 5/8-11 arbor can be used on many small and large grinders.

What’s great about this wheel is the high diamond concentration that provides for long life and aggressive material removal and the ability to work against large grinding segments with heat-treated steel bodies which provide increases durability and wheel life.

Pros:

  • Extended performance diamond matrix provides 350x’s the life of conventional abrasives and aggressive material removal
  • Can be used when wet
  • Great at reducing large amounts of concrete dust

Cons:

  • Works incredibly well but the diamonds can grind down very easily
  • Creates large amounts of vibration

Frequently Asked Questions

Can You Angle Grind Concrete?

You may certainly use an angle grinder on concrete, in fact, it provides one of the easiest wats to grind and smooth out the concrete. There are a few things to keep in mind though.

Grinding concrete will produce a lot of dust and debris, much of it being dangerous to inhale in large amounts. Therefore, using safety glasses and even a respirator mask are essential before you even attempt grinding concrete with an angle grinder.

Once you have safety glasses and appropriate safety gear ready, you will then want to make sure that you have the proper equipment for working on a concrete slab or other concrete structure. The first aspect of concrete cutting is determining which type of blade you wish to use.

You can use either a regular cutting blade or what is known as a ‘wet blade’ when it comes to grinding and smoothing concrete, but a wet blade is likely the better option since this reduces friction and the accumulation of large amounts of concrete dust.

If you choose to use a dry-cutting blade, there are some types that you need to be aware of:

  • Segmented blade. A segmented angle grinder concrete blade has a toothed-rim which helps to blow out the massive amounts of dust and to cool the blade at the same time by allowing increased airflow to the blade. Diamond blades accumulate large amounts of heat during use, therefore, a segmented blade is ideal for concrete since the airflow can help to preserve the life of the blade.
  • Turbo blade. A turbo rim angle grinder blade for concrete is the best diamond blade to use if you want to grind concrete at a quick pace. Air holes are found throughout the center of a turbo blade which allows the entire disc to remain cool with the rapid movement allowed by the turbo blade. This type of blade can ensure that a concrete floor is effectively grinding and smoothed-out in no time.
  • Continuous rim blade. This blade is perfect when it comes to wet cutting, but this blade is not preferred for concrete due to the thickness of the material, which can easily warp the blade due to the decreased lack of airflow of a continuous rim blade.

Wet blades can be problematic for angle grinders when used with concrete (you may only get one use out of a wet blade) but the payoff of using a wet blade is also worth it. This type of blade may make the process run a bit more smoothly in terms of keeping your lungs safe.

Regardless of the chosen blade, having a diamond cup wheel is going to make the process run much more smoothly. This wheel can help to remove any stubborn surface materials from the concrete and is also equipped to attach to a shop vac to remove the concrete dust while you grind and smooth.

Once you have all of this ready to go, it may also be worth investing in a wet angle grinder. This type of angle grinder is the best option to consider if you wish to preserve the life of your regular angle grinder.

Grinding concrete is no easy task for an angle grinder because there is so much dust that can warp and wear down the blade. Therefore, by using a wet angle grinder, you can ensure that this grinder is reserved specifically for concrete.

How Do You Grind Down Concrete?

Now that you have all of your equipment, as well as safety glasses and a proper respirator mask, you can begin the process of grinding and smoothing out concrete.

Be sure to thoroughly sweep off the concrete if you are working with a concrete floor.

Equip your dust shroud to the angle grinder and be sure it is locked into place. You can then connect the end of the shop vac hose to the applicable end on the dust shroud.

Once this is complete, you can then connect the cup wheel, which is the last step in the setup process.

Once you turn on your angle grinder, you can then begin the process of grinding and smoothing out the concrete surface. It is best to work the angle grinder in circular patterns to get the best consistency across the entire perimeter of the floor.

You will likely hit a brick wall when you move near the areas closest to the surrounding wall. You may have to remove the shroud in order to effectively get into these tight grooves and spaces.

Granted, you can make this process run a bit easier if you use a wet angle grinder; this will also limit the number of times you have to empty out the shop vac. You will likely only get one use out of a wet blade, therefore, it is really up to you if you want to invest in something that may only be used once.

Take a look at this video to see the process in action:

How Do You Grind Concrete Floors Yourself?

Grinding concrete floors is a relatively easy process to do yourself, granted you have the required equipment and some knee pads (see on Amazon), which you will need to prevent causing discomfort to your knees. The process can generally be done in as little as 2 hours depending on how much concrete is needed to be ground and how long you wish to complete the process in one sitting.

get some knee pads for grinding concrete

The biggest detriment when it comes to grinding concrete is the dust and debris. If you choose to forgo having a shroud attached for the dust or a cup wheel, you are in store for a hazy, and potentially dangerous afternoon in terms of air quality.

Apart from deciding which type of angle grinder you wish to use to complete the grinding and smoothing, the process is easy, and you only need to make sure you go back over the areas that are obstructed by the shroud.

Be sure to keep an eye on the overall pattern of the floor you are working on, it is easy to lose track of where you have worked and what hasn’t been touched yet.

What Is The Best Blade for Cutting Concrete?

The best type of angle grinder blade is always going to be the blade that can be used for multiple techniques without the need to constantly stop and change to a new type of blade. This blade type would definitely be a diamond cutting blade when it comes to grinding down concrete.

A cutting blade allows you to cut through a range of materials and also use the edge of the blade for some quick grinding touch up work after the cutting process is complete. By using the top center-most portion of the cutting blade, you can effectively grind and alternately go back to cutting to save a lot of time in what can be a long and laborious process.

You will want to choose a cutting blade that is guaranteed to withstand intense cutting pressure with the co-grinding capabilities that can be utilized with a cutting disc. Additionally, you will want to opt for a blade that can withstand the intense amounts of heat that will be generated when grinding concrete.

Conclusion

Grinding and smoothing out concrete is not a difficult process once you know what you need and how to go about the process. Be sure to have a shroud for collecting dust, a cup wheel, and a proper cutting disc to ensure that the concrete is effectively ground and smoothed.

Concrete is thick and filled with dust once it is pulverized, therefore, having a shop vac connected to a cup wheel is going to make your experience with the process much easier to navigate. With that said, working with the concrete itself is an arduous task that requires skill and patience to master.

Ben Jones

When it comes to selecting the right tool for the job there are some important factors that you have to consider. I hope by sharing some of my knowledge I'll be able to educate you on a range of grinders so you can get the job done.

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