Tag Archives: Microdoweling

Roadware MicroDoweling™ Concrete Repair System uses low surface tension and ultra low viscosity polyurethane to penetrate and bond to concrete surfaces from the inside out.

Full Depth Crack Injection with Concrete Mender.

A 24″ deep core sample shows 100% injection repair with Roadware 10 Minute Concrete Mender.

For many years, engineers have looked for ways to fully inject repair polymers into cracked concrete structures. The general consensus is to seal off the crack with a sacrificial epoxy and install injection ports every few inches. Then thick epoxy is injected under high pressure into the crack with expensive resin injection pumps. The process is time-consuming, the epoxy is brittle, the equipment is expensive and the skill level is highly specialized. This makes epoxy injection slow, expensive and not really effective in the field.

At Roadware, we look for ways to make concrete repair fast, effective and easy.  

Fast is better. When injecting Roadware 10 Minute Concrete Mender into concrete, the fast gel and cure time allows you to make a full depth repair from the bottom of the crack up to the top. If the crack you are injecting has a large hidden void, Concrete Mender repairs will start to gel and plug up the void in several minutes. Injection epoxy that takes several hours to cure will sink to the bottom of your crack and pool in the base before it has a chance to cure.

Effective. Concrete Mender is a Structural Polyurethane**.  It is about as hard as typical concrete with much greater tensile and bonding strength. It is super thin at 8cps with a surface tension 1/3 of water. It can to penetrate concrete cracks and surfaces. Concrete Mender does not need to be forced into cracks with high pressure pumps and extraordinary methods.  Concrete Mender can easily flow into cracks and fissures with just simple manual tools and a specially designed application mixer. You can repair more cracks in less time with less waste then ever before. Repairs are structural in nature and will move with the concrete, not against it like very hard epoxies.

 

Easy Application. For a repair to be effective in the field, it has to be simple enough for crews to apply efficiently. Installation productivity saves money.

Diagram showing Concrete Mender Soft-tip mixer injection into a concrete slab.

  1. To start, simply drill a 3/8″ diameter hole about one inch deep into the crack at several points along the crack. Clean the crack and holes with a vacuum.* (Click here to learn how to work safely around silica dust).
  2. Tape off the top of the crack and around the holes you just drilled with clear duct tape or Gorilla Clear Repair Tape. These tapes have a good adhesive that will stick to the surrounding concrete. Do not use packing tape or other tapes without testing them first.
  3. Assemble a cartridge of Roadware 10 Minute Concrete Mender using out specially designed Soft-tip static mixer. Purge the cartridge of air as directed and insert nozzle into the first hole you drilled earlier.
  4. Gently squeeze the handle of the gun and slowly inject Concrete Mender into the crack. Work product into several holes at a time, moving the cartridge back and forth among them. Allow time for  the Concrete Mender to start gelling in the bottom of the crack.  As the crack starts to fill completely, you will see Concrete Mender flow under the clear tape from one drilled hole to the other. You may see air bubbling up from one hole as you inject Concrete Mender into adjacent holes.
  5. Once the crack is filled to refusal, move on to the next few drilled holes until the whole crack is filled.
  6. After 10 minutes at 70 degrees or 23 C, pull the tape. You can use a razor scraper, grinder or polishing device to remove and excess material and blend in the repair.

 

Drilling a pilot hole into a crack to prepare for injection with Roadware 10 Minute Concrete Mender.
Drilling a pilot hole into a crack to prepare for injection with Roadware 10 Minute Concrete Mender.

 

A pilot hole drilled into a concrete crack and ready for injection with Roadware 10 Minute Concrete Mender.
A pilot hole drilled into a concrete crack and ready for injection with Roadware 10 Minute Concrete Mender. Clear repair tape temporarily seals the crack while being repaired.

 

Concrete Mender crack injection with speed inject mixer.
Roadware 10 Minute Concrete Mender is slowly injected into the crack using a Soft-tip sealing mixer.

 

Inject Roadware 10 Minute Concrete Mender into the crack until the product appears under the tape. This fills the crack from the bottom up.
Inject Roadware 10 Minute Concrete Mender into the crack until the product appears under the tape. This repairs the crack from the bottom up. Work several holes at a time allowing the product to gel and seal the bottom as you go.

 

Concrete Mender crack injection into 24 inches of concrete.
Slowly injecting Roadware 10 Minute Concrete Mender into 24″ of concrete using 600ml cartridge and soft-tip injection mixers.

 

Core drilling of Concrete Mender repair shows full depth repair down 24 inches using this method.
Core drilling of the repair shows full depth repair down 24 inches using this method.

 

The core sample shows full depth repair down 24 inches.
The core sample shows full depth repair down 24 inches.

 

 

Concrete Mender repair shown under UV light. See how the Concrete Mender flows into the smallest cracks and brings the concrete back to a pre-cracked condition.
Concrete Mender repair shown under UV light. See how the Concrete Mender flows into the smallest cracks and brings the concrete back to a pre-cracked condition.

 

Using Roadware 10 Minute Concrete Mender and Soft-tip injection mixers, you can structurally repair concrete cracks and delaminations with simple tools and methods. This unique system saves time and money and allow for a high production rate for installers. The drill hole/inject method is much less invasive than traditional cut and fill methods and creates a lot less silica dust on the jobsite. The Microdoweling properties of Concrete Mender and Soft-tip Injection promises to be a winning combination for tough concrete repair challenges.

*“Workers may be exposed to dangerous levels of silica dust when cutting, drilling, grinding, or otherwise disturbing materials that contain silica. These materials and tasks are common on construction jobs. Breathing that dust can lead to serious, often fatal illnesses.” The Center for Construction Research and Training. Click here to learn how to work safely with silica.

** Structural Polyurethane: A polyurethane based material that restores structural integrity and aggregate interlock to distressed concrete by using low surface tension and low viscosity to penetrate concrete surfaces and cross-linking polymer chains to bond directly to the concrete-aggregate matrix.  This bonding action utilizes capillary forces to self-inject polymer chains into the surrounding concrete. This material should have a modulus of elasticity less than the surrounding concrete and should not become brittle over time. This material may be combined with manufactured sand to form a PCC compatible polymer concrete that can structurally repair concrete cracks  and spalls.

 

Repair polished concrete with Concrete Mender™

Stop repairing polished concrete with polyurea joint fillers. They look like plastic, do not bond well, and do not hold-up over time. Concrete polishing lets the natural beauty of stones, sand, and rock shine through.  Your repair product should as well.

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We took the proven Microdoweling™ properties of Roadware 10 Minute Concrete Mender™ and combined it with natural sands, aggregates and pigments to make repairs that not only look great, but perform better than epoxies and polyureas.

polished-repair450

The repair pictured above shows  Roadware Concrete Mender™ Off-white blended with plain concrete sand and a small amount of portland cement. This water-thin polyurethane is almost translucent. When we add nearly any type of dry sand or aggregate, we get a fast-curing polishable repair that blends beautifully with the surrounding concrete. Since this material is almost translucent, it resists shadowing effects due to over-banding when applied.

Ten things about Concrete Mender

Ten things you probably didn’t know about Concrete Mender.
  1. A little Concrete Mender goes a long way.  A gallon of polyurea or epoxy makes a gallon of repair material. A gallon of Concrete Mender mixed with 2 gallons of manufactured sand makes 2.2 gallons of repair material. That makes polyurea and epoxy more expensive to use even at half the price.
  2. All Roadware 10 Minute Concrete Mender is manufactured and packaged in South St Paul, Minnesota, USA.  We do not private label the product to other companies. The, “patent” did not run out allowing other companies to make Concrete Mender.  That was a just an amusing rumor we heard at the World of Concrete put out by an unscrupulous exhibitor.
  3. Microdoweling is more than a funny word.  Microdoweling is the process of using very low surface tension materials that penetrate the surface of damaged concrete and bonding to the aggregate within the concrete mix.  It is an exclusive Roadware technology. You can see the scanning electron microscope photos in our website by clicking here.
  4. Concrete Mender is a structural repair. Concrete Mender is the flagship product for a new class of materials called structural polyurethanes. It is tough enough to be a structural repair, but never brittle like epoxy.
  5. The color of a finished Concrete Mender repair is more influenced by the sand color than anything else.  White silica sand will make a light grey repair. Brown sand will make a darker and warmer tone.  We do offer Concrete Mender in Grey, Off-white, Safety Yellow, Target Red,  Ikea Black and WalMart red/brown.
  6. Concrete Mender is sold all over the world and most overseas exported product is shipped via air.  When your concrete needs to be fixed in ten minutes, you don’t want to wait eight weeks for ocean freight.
  7. When repairing polished concrete floors, you can use polishing dust from the floor, sand and aggregate to give your repairs the same,  “texture,” and look of the surrounding concrete.
  8. Contractors in New Zealand developed simple techniques to repair hairline cracks in walls damaged by earthquakes near Christchurch.
  9. In Japan Concrete Mender is known as, “Crack Bond.”
  10. Every cartridge of Roadware 10 Minute Concrete Mender is packaged by hand and inspected by Amanda.

 

Microdoweling™ and Concrete Mender™ are trademarks of Roadware Incorporated © 2012.

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