Tag Archives: epoxy injection

Uncontrolled Epoxy Injection

Question: How do you epoxy inject cracks in floor slabs on grade when you do not have access to the bottom of the slab? What keeps the product from running out the bottom and all over the place?Answer: We make these type of repairs all the time. The first thing to do is dump the epoxy.  It is too thick, too brittle, and takes too long to set.  Fast setting materials like 10 Minute Concrete Mender allow you to control set points deep in the crack and prevent material seepage.Roadware 10 Minute Concrete Mender™ has an ultra low viscosity of 8cps and will gravity inject into the smallest of cracks. We make the repair in stages adding fine silica sand into the crack as necessary to prevent the material from running out the bottom. The product can be injected with needle tip mixers as small as 18 gauge. With careful technique and experience you can make structural repair that will restore aggregate interlock and restore the slab.

Start out by adding a small amount Concrete Mender to the prepared crack and noting where material in running beyond the slab.  Add a light dusting of silica sand or fine quartz to the crack and some more Concrete Mender. The Concrete Mender will combined with the particles of sand to form a quick setting, “mud” at the bottom of the crack. Repeat as necessary and repair the full depth of the slab.

This will be a structural repair with no ports, no pumps, and almost no down time.

Roadware 10 Minute Concrete Mender™ needle tip application.

 

New Concrete Mender™ Mini Cartridge for precise application.

For the first time, Roadware 10 Minute C5150-mender-verticaloncrete Mender™, the industry’s only Microdoweling™ concrete repair polyurethane, is available in 50ml mini cartridges. The mini cartridge offers precise application control that is perfect for repairing hairline cracks. Each mini cartridge comes with a needle tip mixer and is simple to use. Use the 50 ml cartridge with the Roadware 5150 application tool. Each cartridge will repair about 10 feet of hairline cracks or 3 feet of 1/4 x 1/4 inch cracks.

 

Roadware 80105 50ml 10 Minute Concrete Mender™ mini cartridge with mixer and needle tip.

 

 

Use Roadware 10 Minute Concrete Mender to repair and re-bond delaminated concrete slabs.

Use Roadware 10 Minute Concrete Mender to repair and re-bond delaminated concrete slabs.

Roadware delimanition repairs are featured in the July 2008 issue of Concrete International. This is the official publication of the American Concrete Institute. The article was written by Nelson Tonet, President of Express Polymers and a Roadware distributor.

ABSTRACT
“Delaminations in concrete floor slabs can be difficult to repair in a cost-effective and timely manner. A newly developed product (Roadware 10 Minute Concrete Mender™) that uses a two-part hybrid polyurethane with a viscosity similar to water can significantly reduce the difficulty of performing delamination repairs by easily flowing up to 10 ft (3 m) from an injection point and penetrating deep into concrete surfaces. The product also speeds up repair by setting in only 10 minutes, allowing the repair to be checked by sounding only 30 minutes after product placement.”

View full article in PDF format Delamination Repairs PDF

Here is a Roadware synopsis.

Roadware 10 Minute Concrete Mender™ is an excellent choice for repairing concrete slab delaminations. The very low viscosity of less then 8 cps and the exclusive Microdoweling™ penetration properties of the material allow it to flow deep into delaminated concrete voids. The Concrete Mender will restore aggregate interlock and will allow dynamic load transfer under heavy traffic. The expense and mess of pressure injection with epoxy can be avoided.

Two methods of repair have been successful. The first involved dry diamond drilling a 2 or 3 inch (5-8 cm) diameter hole into the concrete slab down to the delamination. Dust is removed with a shop vacuum. Roadware 10 Minute Concrete Mender is poured or pumped into the void. Only one or two inches (3-5 cm) of head pressure is required to push the material as far as 10 ft (3 m) into the delamination. When the material backs up to the top of the hole and the void is filled, silica sand is added and the hole is filled flush with the surface. Soundings are made with a hammer to verify the delamination is repaired in about 30 minutes after application.

Click here to see how Nelson Tonet repairs delaminated concrete slabs.

Another method is to drill multiple 3/8 inch (1 cm) holes into the concrete down to the delamination. Remove dust with a shop vacuum and inject pre-mixed Roadware 10 Minute Concrete Mender™ with a syringe tipped with a rubber gasket. With this method, you can actually see the material exit the adjacent hole and verify the material is filling the delaminated area. After filling, the holes are blended into the surrounding concrete with silica sand and Concrete Mender or re-drill 1/4″ (5 mm) deep and fill with a color matching concrete mortar.

See the movie:

Both methods will yield good results and are more cost effective than epoxy injection.

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”

Gravity Crack Injection

Roadware 10 Minute Concrete Mender™ is an excellent choice for repairing full depth concrete slab cracks. The very low viscosity of less then 8 cps and the exclusive Microdoweling™ penetration properties of the material allow it to flow deep into cracks. The procedure below illustrates Microdoweling™ in action.  The Concrete Mender will restore aggregate interlock and will allow dynamic load transfer under heavy traffic. The expense and mess of pressure injection with epoxy can be avoided.Here is a parking deck project located in the North Eastern United States. Hairline cracks run 9-12 inches deep through the deck slab. The contractor drilled 1 1/2 inch holes, 2-3 inches deep into the hairline cracks approximately every 18 inches. Inspection from the floor below reveals full penetration without pumps or ports. Engineers tell us that Roadware Microdoweling™ is quicker and more cost effective than epoxy injection.  The results speak for themselves.

Drilled concrete deck

 

drilled crack in parking deck

 

Gravity crack injection parking deck

 

concrete cracks gravity injection