SOLVED! - How To Break Up Concrete With Chemicals: Guidance

Capable of withstanding outdoor elements and physical impacts, concrete is the material of choice for a wide range of construction. That being said, the toughness of concrete also gives people a hard time when they want to knock down structures. Overall, with the help of tools, it’s possible to take concrete apart via brute force but that takes a lot of time and effort. Thus, among modern homeowners who place an emphasis on efficiency and effectiveness, there is an increasing interest in how to break up concrete with chemicals.

Instructions On Breaking Up Concrete With Dexpan

Shebeshekong River Fish Habitat Restoration Using Dexpan — Dexpan

Plan to get rid of a concrete structure in your house via chemicals but don’t know what to do? In that case, this article may be what you need. Down below is everything you must know regarding the use of Dexpan, an expansive demolition grout, for concrete removal.


Dexpan is a chemical solution so if you handle it carelessly, you would be in for a world of hurt. For your own well-being, you have to keep these notes in mind as you prepare to break apart concrete.

  • Gather personal protective equipment: When you work around Dexpan keep a respirator, a pair of goggles and gloves on you at all times. Due to the formula, Dexpan could cause quite a few health issues if you get it on you so be careful.
  • Assemble tools and accessories: You need to drill a series of holes on the concrete for the application of Dexpan  Hence, you should pick up a power drill as well as big drill bits. In addition to that, Dexpan requires mixing prior to use so you have to keep a bucket and a paddle around.
  • Take elements into account: Temperature, water and so on affect the performance of Dexpan so you must give them some thought. For instance, if Dexpan gets diluted too much by water, its ability to break up concrete is going to degrade. Also, if the temperature is too high, the odds of blowout tend to spike which may lead to injuries. Feel free to use weather forecasts to deduce the ideal day to apply  Dexpan.
  • Clear out the site: As an expansive demolition grout, Dexpan sometimes produces explosive results and that means you should keep everyone away from the site. In most of the cases, Dexpan would need 24 hours to get the job done so don’t let others approach the site during that time.


  • Step 1: Mark the holes 

Get a hold of a tape measure and chalks then start marking the position of holes on the concrete. It’s essential for the holes to create a grid pattern and the distance between holes needs to stay around one foot.

  • Step 2: Drill the holes

Turn on your power drill and proceed to drill each of the holes that you marked previously. Remember that you need to stop drilling as the drill punches through approximately 80% of the depth of concrete.

  • Step 3: Mix the chemical solution 

Empty a bag of Dexpan into the bucket and pour in half a liter of cold water. Next, you have to use the paddle to mix the mixture until all the lumps go away.

  • Step 4: Apply the chemical solution 

After mixing the chemical solution, wait 15 minutes before pouring them into the holes. There is no need to rush but it’s best to get Dexpan into the holes as quickly as possible. Subsequently, set up covers on top of the holes to keep sunlight, snow and rain from coming into contact with Dexpan. In the case that you have excess Dexpan, dispose of it properly as you cannot reuse a mixture of grout.

  • Step 5: Collect pieces of concrete 

Articles that deal with how to break up concrete with chemicals claim that within half a day following the application of Dexpan, cracks would appear. Still, to be thorough, you should avoid doing anything for at least 24 hours. On the next day, the concrete should be cracked to the core so all you have to do is to collect the pieces. When you toss out the pieces, you may start whatever project that you have in mind.


Dexpan Expansive Demolition Grout 44 lb. box for Concrete Removal

What is the best time to apply Dexpan?

The application of Dexpan should best take place in two periods: early in the morning and late in the afternoon. By applying Dexpan in such periods, you could prevent the mixture from being exposed to high temperatures as it settles. In times of need, you can even apply Dexpan at night as well but that presents its own set of challenges. If you decide to go with a night application, get in touch with the technical department of Dexpan for guidance.

How many types of Dexpan exist?

At the moment, the market contains three types of Dexpan:

  • Type 1: For temperatures between 25 and 40 degrees Celsius (from 77 to 104 degrees Fahrenheit)
  • Type 2: For temperatures between 10 and 25 degrees Celsius (from 50 to 77 degrees Fahrenheit)
  • Type 3: For temperatures between -5 and 10 degrees Celsius (from 23 to 50 degrees Fahrenheit)

It’s noteworthy that the temperature used to classify Dexpan types is the core temperature of the to-be-broken material, not the air temperature. However, the ambient temperature still requires consideration as it would heat up/cool down concrete.

Do I have to use specific types of Dexpan for specific conditions?

Temperature changes from time to time which is why Dexpan releases three types of grout to the market. To ensure that the process of breaking up concrete proceeds smoothly, use the type of Dexpan that matches your climate. If you use the grout rated for a cooler temperature, the reaction is going to unfold too fast and lead to blowouts. On the other hand, if you use the grout rated for a hotter temperature, the reaction may only produce superficial cracks.

How long would Dexpan last in the bag?

Assuming that you keep your bag of Dexpan away from the elements, it would remain ready to use for well over three years. That being said, the shelf life of Dexpan shortens if you open the bag as moisture in the atmosphere and powdered grout don’t mix well. Once it comes to how to break up concrete with chemicals, the state of chemicals play a key role so take good care of your Dexpan.


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