A Checklist for Concrete Pond Repairs

Repairing a concrete pond can seem a daunting task. However, if you know what is needed prior to performing the repair, the task will be that much easier. The following list is made up of everything you could possibly need in order to get the job done quickly and correctly. Assuming the pond has been drained, you will need the following:

Cleaning tools – Scrub brushes, rags and pressure washer are the minimum cleaning tools needed. These will be used to scrub any organics off of the surface that requires repair. Buckets, a garden hose and any other item you think might aid in washing and rinsing the affected area are also helpful.

Trash receptacles – Trash bags and a good trash can will be needed to dispose of unwanted debris.

Scraper – Use a scraper to dislodge anything organic that was not removed with the pressure washer. It can also be used to scrap away failing coating around the affected area. If the concrete has cracked through and the coating has been compromised, it will need to be feathered back from the crack.

Angle grinder and cutting wheel – use and angle grinder and cutting wheel to cut straight down into a crack at least 1/4 to 1/2 inch deep depending upon the concrete thickness. This is to allow the new epoxy to get further into the crack where it can bond to and essentially glue the crack back together. If the repair consists of replacing a chunk of missing concrete, the angle grinder can be used to smooth the area and ready it for the addition of more concrete.

Sander – Usually and angle grinder can be used to feather back the existing coating but a sander will work just as well for this purpose.

Pond ShieldUse for fixing a crack in concrete to essentially glue the crack back together.

Fiberglass – 1.5 ounce chopped strand fiberglass mat is used in conjunction with the Pond Shield in order to give the surface of the concrete pond repair additional strength.

Concrete and bonding agent – If the surface being repaired consists of a missing piece of concrete, then concrete and a good bonding agent are needed. Because concrete does not stick well to concrete a binding agent is used to aid in the bond between the two. using a polymer concrete like hydraulic concrete or an accelerated concrete means the curing process will be quicker (7 days) at which point the surface can be cleaned and ready for the epoxy coating.

Muraitic acid – Used to clean new and old concrete before applying an epoxy like Pond Shield. Concrete hydrates and pushes calcium sulphate to the surface during this process. The acid is mixed 1 part acid to 3 parts water and applied over the concrete to clean away the calcium sulphate before coating.

Paint brushes and paint rollers – These will be used to apply the new coating prior to putting the concrete pond repair back into service.

There is a general walk-through in regards to fixing cracks in concrete that may aid you. It is called “Got a Crack in Your Pond? Easy Methods of Fixing a Crack in Your Pond” and can be found by clicking the link. if you have any questions, please contact us.

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How to Rough up Concrete

So if you want the coating to stick to the concrete it has to be at least a little rough.  If you have not acid etched the concrete yet, then you are in luck.  The chances are that when you do acid etch, the calcium sulphate will be removed from the surface and leave you with a more porous surface, which in essence equates to being more rough.

However, there are times that even after a good etching, the surface is still too smooth.  If this is the case, you will probably be stuck with either sandblasting or grinding the concrete to get it into shape.

If you are going to sandblast, be sure to choose a quality professional to do the job.  Sandblasting can make a mess and the last thing you need to worry about is the guy doing the job and whether or not he does that without making a serious mess or damaging surround items.

If you prefer to grind, then an angle grinder equipped with a flexible sanding disk that is about 36 or slightly finer will do the job as well.  Make sure you wear proper protective clothing as flying debris can damage your eyes.

Once all has been blasted or ground down, you will have to acid etch again, as the newly acquired surface will have fresh calcium sulphate in it that will need to be removed.

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