Tag Archives: earthquake damege

Repairing vertical cracks in concrete structures with Roadware 10 Minute Concrete Mender™.

The same Microdoweling™ properties of Roadware 10 Minute Concrete Mender™ that make the material excellent for repairing horizontal surfaces also make a good choice for vertical repairs.

Roadware 10 Minute Concrete Mender™ is a very low viscosity polyurethane that uses a surface tension one-third of water to penetrate quickly and deeply into concrete cracks. The typical process relies on self-gravity injection to fill cracks completely. What is not seen by the naked eye is the capillary action of the Concrete Mender polymer chains flowing horizontally into the sideswalls of the crack.  We call this chaining of polymers into the concrete Microdoweling™.  This chaining of the concrete together works on vertical surfaces too.
So, your saying, “How do we get this super thin material to stay in place long enough for the Microdoweling™ to take place and the repair to cure?” Over the years, Roadware contractors have come up with creative and ingenious ways to use Roadware 10 Minute Concrete Mender™ on vertical surfaces. Here are some techniques that have evolved.
1.     Vertical Crack Injection
This technique involves covering the vertical crack with transparent duct tape and injecting Concrete Mender through the tape with a needle tip meter/mix cartridge. This method will work well if the concrete surface is smooth and the tape can make a good bond with the surface. The crack should be 1/4 inch (5mm) or less in width. The tape will make the, “form” while the Concrete Mender sets. Concrete Mender will not stick to duct tape, so once the material cures, you can cleanly pull off the tape. It is best to warm the cartridges up to 80° F (26°C) before use for a faster gel time. Start filling the crack at the lowest point and work you way up.
See the video here.
2.     Bulk Mix and Trowel Applied Repair
Mix bulk Concrete Mender and 60-80 grit manufactured sand into a thick mortar. Working in small batches, use a margin trowel to make the repair. The fine sand will hold the Concrete Mender in place long enough for the Microdoweling™ effect to take place and for the material to set.
3.     Bag Mix and Apply
This method uses a heavy duty, clear plastic bag to quickly mix one part of blended Concrete Mender to two parts of 60-80 grit manufactured sand. Once mixed by kneading the bag for several seconds, the bag is opened and the whole batch is applied and held in place with the bag. This technique is used around building mechanical entry points such as refrigeration and HVAC units.
Whatever method you choose, Roadware 10 Minute Concrete Mender™ stands at the ready to perform. Finished repairs can be ground smooth and painted to match the wall if necessary.
Kelton Glewwe
VP Operations

Earthquake Crack Repair at Hope Alive Clinic in Haiti

“Kelton,

In March, you donated the Roadware kit to bind the cracks at the Hope Alive! Clinic in Haiti. THANK YOU FOR YOUR GIVING AND KIND HEART.

We went to the Atlantic City airport with the msds. They refused to allow us to bring the tubes on the plane. (they really didn’t know how to read the msds sheets either)

Anyway, we shipped the package via Philadelphia-container-Haiti. It arrived in time for our July 8th trip.

We brought along a Pastor who is also a “concrete guy”. He stated that he had never worked with a product that was so easy and did such a great job. As you can see in the attached photos, the fissure is completely sealed. As I mentioned in our phone conversation, the epi-center of the quake was only 6-7 miles from our clinic. We even have 2 sets of tubes left over!! (the neighbors will benefit)

I do not know how to say thanks but to just say “thanks” . Your kindness has made a difference with Hope Alive Clinics and the Haitian people. visit www.hopealiveclinic.org for more pictures of the teams and clinic activities.

If you are ever in the Philadelphia area, please look us up.

Again, many thanks and God bless you and your great company.

Frank Jacobs
Director, Hope Alive! Clinic Ministries”