All posts by Kelton Glewwe

Vertical Wall Repair at Club Warehouse Store

Use Roadware 10 Minute Concrete Mender™ and sand to repair damaged concrete block walls in an hour or less. Sent in by Dave Wilson at Myspec Integrated Concrete Repair Group in Georgia.  770-335-9123 Roadware 10 Minute Concrete Mender™ is great for repairing cracks and spalls in floors. This ultra-low 8cps viscosity material gravity flows deep into concrete and makes repairs from the bottom up.  To repair a holes in a block wall, mix the Concrete Mender™ with fine silica sand to make a trowel-able mortar.

 Step 1: Prepare the area and remove any loose block, paint or dirt.

 

 

Step 2: Mask off the area like shown. In a clean bucket, mix one part AB blended Concrete Mender with 3 parts sand to make a stiff mortar and trowel into the repair area. You may want to tape a plastic sheet over the repair area to hold the Concrete Mender mixture in place while it cures for 10 minutes. See bulk mixing instructions here.

 

Step 3: After approximately 10 minutes depending on the ambient temperature, pull the masking and blend in the repair with a rubbing brick.

 

Step 4: Roadware 10 Minute Concrete Mender™ can be painted as soon as it cures.  Paint the repair area to match the surrounding wall.

With Roadware 10 Minute Concrete Mender™ you can do a job in less than an hour that used to take two days. No more waiting for hours or days while traditional cement based materials to set and cure.

Here is a video of using Roadware 10 Minute Concrete Mender™ to repair cracks in concrete or block walls.

 

 

Roadware Contraction Joint Repair

Why are my contraction joints spalling and what can I do to stop it?

  

Contraction joints (or control
joints) are joints cut into a slab shortly after pouring. The purpose of these joints is to control the cracking of the slab as it cures. Most concrete slabs shrink and sometimes curl for the first 12 months after pouring. Contraction joints allow the
slab to crack at pre-determined intervals instead of natural random cracking. Joint filler is used to protect the joints from spalling and chipping caused by traffic on the slab.
 control-joint-filler-original

As the slab cures for the first
12 months, it shrinks in size and may even curl up at the joints. The contraction joints will expand as the slab shrinks. This causes the joint filler to split apart or dis-bond from the sides of the joint leaving them exposed to traffic.

control-joint-filler-curled
When loads are rolled over the
joint. The force of the load has to transfer from the wheel, to the concrete, and to the base. If the slab is even slightly curled and the joint is expanded, the force of the load will impact on the joint causing cracking and spalling. You may even get stress cracking parallel to the joint. You can sometimes feel the uneven load transfer across the joint if you stand with one foot on either side of the joint and have someone else roll a heavy load across the joint.
control-joint-filler-curled-dynamic-load
Eventually, you get a spalled contraction joint. The joint filler has completely failed or is missing. Wheels go “thunk, thunk” every time they go over the joint. Productivity suffers, and the joint fills with dust and debris.
 control-joint-filler-curled-spalled
A popular and effective way to repair spalled contraction joints is to lock them back up with Roadware 10 Minute Concrete Mender™. Once the slab is 12 months old, the shrinkage and curling has finished. There is no longer a need for contraction joints. Now you can use Concrete Mender™ and silica sand to bond the slab back together from the base all the way up to
the top. This will stabilize the slab, restore aggregate interlock,
and allow for complete and even load transfer from the wheels all the way down to the base. Your contraction joint problems are solved.
control-joint-filler-curled-spalled-repaired
NOTES: Locking up contraction joints
is recommended for interior controlled environment applications with sound concrete and base. Exterior applications may have different results. Always test a small section
of large repair for compatibility.
 See how this repair was made by clicking here.

 

 

Repairing Cracks in Driveways and Patios Updated

One of the most common calls we get is asking how to repair a crack in a driveway or patio.  We designed Roadware MatchCrete™ Clear with this in mind.  Roadware MatchCrete™ Clear is a UV stable clear polyurethane hybrid that makes effective repairs to most exterior concrete surfaces.  By simply leaving the repair clear, the color of the surrounding concrete shows throughout the repair.

The first step to a good looking crack repair is to rout-out or cut the repair open with a diamond blade grinder.  You only have to go about 1/4″ x 1/4″. This will create a recess for the material to rest as it soaks down further into the crack.  Skipping this step will allow the material to flow uncontrollably on the surface and will create a messy looking repair.

 

Apply cartridge mixed MatchCrete™ Clear directly to the crack. Small amounts of silica or quartz sand can be added to keep the material from flowing out the bottom of the slab.  If necessary, matching colored sand can be used to match colored concrete areas. Fill the crack to slightly below grade to prevent material from flowing on to the surface of the concrete.

After a year of service, the repair above still looks good.  Please note, MatchCrete™ Clear is not a soft expansion joint material and should not be used in joints that are designed to move.  Always give careful consideration as to why the concrete cracked in the first place and what the concrete is expected to do in the future before making repairs of this nature.

UPDATE:
September, 2013
We have a new video for driveway hairline crack repair:

Buy a gallon and make two. Good deal!

One gallon of Concrete Mender™ goes a long way.

 

Yield of Concrete Mender verses epoxy and pylurea.

 

One gallon of Concrete Mender™ will make 2.2 gallons of repair material when typically applied with 2 parts sand. That makes Concrete Mender™ a better value then most epoxies and polyureas. No other product we know of goes as far and performs as well.  Any way you look at it, Concrete Mender™ is a better value even it it was twice the price.

 

Freezer threshold repair with Roadware 10 Minute Concrete Mender™.

Freezer, chiller and cooler thresholds have been an ongoing challenge to floor repair contractors and the USDA since the 1950’s. Recognizing the need to keep refrigerated and frozen food storage areas clean and sealed so they will not harbor lichen, fungus and pests, the USDA has issued zero tolerance guidelines for floor cracks and spalls in all food processing and refrigerated food lockers. Unsealed and opened joints also come under the watchful eye of those charged with keeping America’s food supply safe. Because thresholds are freezing cold on one side and at room temperature on the other, the thermal stress on the concrete is unrelenting and unforgiving. Couple this with forklift and wheeled cart traffic and you have a formula for disaster.

 

Fortunately, 10 Minute Concrete Mender™ has become the accepted repair material for these very harsh conditions. The agency itself is forbidden from recommending one product over another, but the personal choice among active USDA inspectors is Roadware 10 Minute Concrete Mender™. It’s thin, it gets in, it won’t pop out.

Some minimal prep work is required when working in the cold. Have the cracks and spalls as clean and dry as possible. This may not be easy, but it’s a step professionals know better than to ignore. Next, apply Mender to the base and sidewalls to seal off any free moisture movement into the repair area. Immediately follow by filling the spalled area or crack, almost to the top, with manufactured sand or approved quartz. Flood the sand to refusal, making sure the Mender saturates each grain. For larger areas, a bulk mixed mortar of Mender and sand may be easier to handle and install. Keep all materials at room temperature or warmer to speed up cure time. Even then, one should plan on an hour or more if temperatures are extreme. However, since all conditions vary, onsite testing is the best way to insure the time at which freezer floors and thresholds will be traffic-ready. Contractor field reports are very solid in reporting that 10 Minute Concrete Mender is the only thing that works in these tough repair situations. Click here for step by step bulk application instructions.

 

1. Remove existing concrete to wood base.

2. Saw key-way at a 45° downward angle on the cold side of the

threshold toward the freezer.

3. Using a diamond shaped pattern, drive sheet rock screws into

the base leaving 3/8″ of the screw sticking up, to act as a

dowel pin for the finishing lift of 10 Minute Concrete

Mender and sand aggregate.

4. Place 10 Minute Concrete Mender to grade. When fully cured

(about an hour at 32F, 0C) sawcut the warm side joint and fill

with Roadware Flexible Cement II™.

5. Reopen to traffic when Flexible Cement II is fully cured.

Continue reading Freezer threshold repair with Roadware 10 Minute Concrete Mender™.

New Roadware Estimator App

UPDATE: The new online Roadware product estimator runs on most browsers and mobile devices including iOs and Android. Click here for the Roadware Online Product Estimator.

Announcing the Roadware Product Estimator App for iOS devices.

 

Users of iOS devices such as the iPhone or the iPad now have a convenient way to estimate the amount of Roadware 10 Minute Concrete Mender™ needed to repair a concrete crack, joint or spall.  Since Concrete Mender may be extended with sand at a ratio of two parts sand to one part liquid, estimating product usage is more challenging. The Roadware App eliminates the guesswork and gives users an estimated usage in 600ml cartridges and gallons of material. Sand ratios can be adjusted from none, 2:1 and 3:1 for special applications. An internet connection is not necessary when using the App so you can make an estimate from anywhere.

The Roadware App can be downloaded for free at the iTunes store by searching for Roadware or by clicking here.

 


Enter the crack dimensions in English feet and inches or metric meters and millimeters.

Set sand ratio. Default is two parts sand two one part mixed Concrete Mender.

Click the Calculate button at the top.

 

The resulting screen shows:

Total cubic centimeters need to fill the repair area.

Total gallons of mixed repair material needed.

Number of 600ml cartridges of Concrete Mender needed.

Number of gallons of Concrete Mender needed.

 

Using Roadware MatchCrete™ Clear to repair cracks on the historic Stone Arch Bridge.

This week the City of Minneapolis used Roadware MatchCrete™ Clear to repair cracks in the exposed aggregate walkway surface on the Stone Arch Bridge in Minneapolis, Minnesota.   The Stone Arch Bridge is unique to the Mississippi River and features 23 arches, is 2100 feet long and 28 feet wide.

The bridge was built by railroad baron James J. Hill in 1883 and served as a working railroad bridge until 1965.  Today the bridge is mostly used by walkers and bicyclists.  The bridge also hosts many festivals and public events in the summer months.

In preparation for the summer festival season, City of Minneapolis crews used Roadware MatchCrete™ Clear to repair cracks in the exposed aggregate walkway surface. MatchCrete™ Clear is combined with matching rock to repair cracks and restore a consistent walking surface.

The process begins with routing out the cracks with a dry diamond blade
to remove loose dirt and debris. Clean and dry matching stone is placed
into the crack up to surface level.

Matching stone is added up to the surface level

Next, two-part blended MatchCrete™ Clear is poured into the repair up to the surface. This fills in all the voids between the stones and seals the crack.  MatchCrete™ Clear is a semi-ridged material that will support all kinds of traffic from pedestrians to industrial fork lifts.

MatchCrete™ Clear is added to the pre-placed stone

See video MatchCrete™ Clear application video below:

 

Repairs will have a, wet” look for a few months and will naturally dull over time. A clear coat sealing over the entire surface will off-set this effect.

MatchCrete™ Clear repair in exposed aggregate concrete.

In a few months, Repairs with MatchCrete™ Clear will dull and blend into the surrounding concrete.

Over time, repairs will become less shiny.

Update: June 24, 2012.

MatchCrete™ Clear repairs 18 days later.

 

I revisited the repairs on the bridge 18 days later. The surface has been sealed.  The repairs are performing as expected.

Roadware MatchCrete Clear is available is 50ml and 600ml cartridges and two gallon bulk kits.

 

Roadware MatchCrete™ Clear 71300 600ml Cartridge

 

 

Roadware 10 Minute Concrete Mender™ Best Practices

 

ROADWARE 10 MINUTE CONCRETE MENDER™

Buildings marked for demolition in Christchurch, New Zealand.
Recently, our Roadware distributor in New Zealand requested a list of best practices for using Roadware 10 Minute Concrete Mender™.  Contractors in Christchurch are using Concrete Mender to repair many meters of cracks following recent earthquakes.   
Best
Practices
Storage
and Transportation
1.
Keep cartridges in original foil bag and store in
an upright position.
2.
Store on a cool dry place between 10-28 degrees
C (50 – 80 F). If cartridges are allowed to freeze below – 10 C (14 F) some material separation
can occur.  Return material to 25 C (75 F)
and shake or mix to re-blend before use.
3.
Handle with care. Punctures to the bag can cause
moisture contamination. Rough handling can cause cartridge cracking and
leakage.
4.
Ship in upright orientation in original shipping
containers.
Usage
1.
Read and follow illustrated instructions.
2.
Use gloves and safety glasses.  Concrete Mender is very thin and can
splash back if applied erratically.
3.
Make sure the flow-restrictor and mixer seat
properly.
4.
Use a new flow-restrictor and mixer every time.
5.
Small cracks less than 2mm should be cut open to
5mm for best results.  The 5mm cut
will form a, “well” for the product to accumulate as it soaks down into the
crack and will reduce material spreading on the surface away from the repair
area.
6.
Once material is flowing from the mixer, keep the
tip pointed down.  Use the thumb
release on the gun to stop the flow.
7.
Discharge the material from the cartridge
firmly.  Working too slowly can
cause poor mixing.
8.
Always apply a coating of Concrete Mender into the crack or spall before adding sand. This will give you better penetration and bonding.
9.
When applying with sand, make sure the sand and
repair area are completely saturated with Concrete Mender.
10.  Use a shop vacuum or compressed air to remove as much dust and contaminates from the
repair area.
11.  If you suspect there is water on the bottom of the crack that you cannot remove, repair the bottom half first and allow it to cure (turn grey) before repairing the top half.
12.  When working at below 0 degrees C, use a propane torch or similar method to remove any surface frost from the concrete before applying the material. Keep Concrete Mender and sand at room temperature before use.

13.  Needle tip mixers are great for better control and pinpoint application. They also can easily clog up when left filled with mixed product. Do not try and force a mixer or tip to clear by adding more force to the gun. You can blow out the rear seals and cause a mess.  Get a new mixer or tip and start over.

Concrete Mender™ is injected into cracked walls in Christchurch, New Zealand.

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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World of Concrete 2012 in Las Vegas

Hello Concrete Professional,Are you attending the World of Concrete 2012 in Las Vegas?

Please accept my personal invitation to visit Roadware booth S11447
at the World of Concrete 2012. We have new Roadware concrete repair
products to show and more opportunities to grow your business than ever.

New in 2012:

Roadware MatchCrete Clear
has an improved formula that is easier to use and will not bubble or
swell under high moisture conditions. Perfect for repairing polished
concrete and exposed aggregate. We will be demonstrating this new
formula through out the day. Use MatchCrete Clear indoors or out with
confidence.

 

Roadware Off-white Concrete Mender
(formally known as MatchCrete Concrete Mender), is our color matching
base material for repairing and matching stained and polished concrete
floors.

Roadware Safety Yellow Concrete Mender is a great solution for installing permanent yellow safety floor markings.

Roadware 50ml Mini Cartridges. These easy to use cartridges are great for precise application and repairing hairline cracks.

Roadware 10 Minute Concrete Mender–
The gold standard in high-performance concrete repair for almost 20
years now. “It’s thin, it gets in, and it won’t pop out!” is not just a
slogan, we stake our reputation on it.  Roadware 10 Minute Concrete
Mender is the mission critical concrete repair product you have been
looking for. With a surface tension one third of water, this product
gets deep into concrete surfaces and structurally bonds slabs back
together.   2010 MIP Winner.

I hope we can work with you and do more business in 2012.

See you at the show!

Kelton Glewwe
Vice President
Roadware Inc.
Office: 651-457-6122
Cell: 612-801-9200

P.S.

We tend to get swamped with the crowds at the show. Feel
free to send me a text message at 612-801-9200 before or during the show
to schedule a quick meeting.