Remove contaminants where the epoxy will be pooled around the crack, including laitance, oil, dust, debris, or other foreign particles.

The epoxy will not work effectively in cracks that are filled with contaminants. Use compressed air to remove debris and other foreign particles from inside the crack.

Ensure that concrete is sufficiently dry prior to applying the epoxy.

For cracks that extend completely through the concrete section, seal the crack on the back or underside of the concrete to prevent the epoxy material from flowing out. Remove the surface sealer after the gravity-fed epoxy has had adequate time to cure.

Measure the quantity of each component per the manufacturer’s requirements, then dispense into a clean container. Do not estimate the proper amounts while adding the different components. Follow the product specifications for maximum time allowed for use after mixing. These materials have short pot life when left in a container and if left too long they will flash set.

Mix the components thoroughly for 3 minutes using a low-speed electric drill (400 – 600 rpm) and a clean “Jiffy” type mixing paddle. Ensure that the material is well-blended after mixing.

Do not mix gravity-fed epoxy material by hand.

Pour sealant directly on cracks within the treatment area. Distribute the sealant over the surface to be treated within the lot size that can be accommodated for the particular sealant being sealed. Brush grooved cracks with heavy nap roller. Pull additional sealant material onto crack using squeegee or broom and then re-brush crack with heavy nap roller.

If applying on grooved surface, remove excess sealant from deck surface and brush or broom out epoxy from texture grooves. Do not allow the ponded sealant to stiffen, and do not allow sealant to remain in the grooves on the bridge deck.

Broadcast or spread sand onto the still tacky sealant within 10 to 20 minutes of the last application of sealant. Apply the sand at a rate of 15 to 20 lb. per 100 sq. ft. of area.

Contractor may propose alternate application techniques that meet manufacturer requirements.

When sealing isolated cracks and flooding the surface will not be done, install temporary dams around the crack so the pressure head of the gravity-fed epoxy will build up. Install the dams using a material that will prevent the epoxy from spreading over the concrete surface, and that can be removed after the repairs have been completed. Leave the pooled epoxy in place for at least one hour. Refill the dammed area as necessary if the epoxy drains completely into the crack.