Concrete Bonding

Picture of Concrete Bonding
Fact: Fresh wet concrete does not normally bond well to existing dry concrete. Do you remember elementary school where one of the subjects on which you were graded was “plays well with others”? Concrete would have gotten an F. There is nothing in basic portland cement that will act as a bonding agent. Portland cement concrete works well in mass and provides great compressive strength but not bond.

Concrete is marvelous stuff but in time it will deteriorate. When it does you either have to patch it or replace it. Assuming that it is structurally sound the least expensive alternative is to patch it. However patching it requires some attention to detail or your patch will not last. So that you don’t waste too much time or money we should probably discuss what “structurally sound” means. If your sidewalk has either heaved or dropped at almost every joint, repairing it will not provide a long term solution. The slabs are likely still moving. If your slab has so much sand and gravel on the surface that despite sweeping and sweeping and squirting and squirting it just keeps coming back, don’t waste your time on repairs. If you have multiple cracks that run so deep that they appear to run through the slab, a repair would only be temporary. The solution to all of these problems involves a jack hammer and bags of one of the Sakrete concretes.

There are a variety of concrete repair products available to fix concrete that has begun to deteriorate. However without good surface preparation, none of them are going to perform satisfactorily. All loose sand, gravel, dirt, leaves etc. must be removed. This can typically be done with a garden hose and a good nozzle. Tough areas may require a pressure washer or mechanical abrasion. The two toughest areas to cover are those with oil and tree sap. Both of these will work their way down into the concrete. Simply washing the surface isn’t sufficient. If the stains do not run too deep you can chip away the concrete using a hammer and chisel. Don’t forget the goggles (not just glasses) as this process will throw concrete all over the place. Also keep your thumb out of the way. If the spots are too large or too deep for this to be practical you may need a sealer to cover the stains before patching.

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triumphman2 years ago
Hi, I am in the NE , right in the storm area, now! I woke this Sunday , 6:30 am, and discovered two small waterfalls in my basement! It seems the builder of my Log Home failed to seal off the two holes surrounding the two plastic pipes that exit my basement, about chest high. One small pipe goes to our drywell (washing machine water), and the larger is the septic tank pipe. They both have a black rubber gasket around them. But the holes they made are roughly cut. It has been raining pretty hard here. I'm guessing the water table rose so fast or the rain water soaked into the ground so fast that it came through those pipe holes. Anyway, the rain is easing off and I wet vacumed up the two inches of water in the left side of my basement! My question is : is there a product that I can get to seal the area around those pipes from inside ? I don't want to go through that again! The wonderful builder also did not provide any way to get the water out of the basement. No sump pump, no sink, no nothing. I have to use a pond pump to pump my wet-vac out my basement doors, as the wet vac holds 16 gallons! I can not lift it up seven concrete basement steps when its full either! I did this about 10 times. Wow! Anyway, I apologize for rambling, any help with a solution will be deeply appreciated !
In addition to repairs do purchase a sump pump. It will save you time, stress and maybe a lot of money as well.
Repairs are wonderful but repairs are needed rather suddenly at times. That sump pump can be a wonderful thing. In my area we can't have basements and we get tropical rains. there is always a threat of flood for all homes. We can't elevate the home either as when our hurricanes hit taller is dead meat. Keeping a roof close to the ground saves lives and having only a tiny overhang saves the houses as well . A big overhand on a roof makes a great place for high winds to grip a roof.
Actually you have several problems here.
1)The foundation was not sealed from the outside to prevent water intrusion.check out this link

2)You have a substandard or non-existant weeping tile system, you should NEVER get that kind of water coming into your basement. The weeping tile system is suppose to guide your excessive ground water that comes in contract with your foundation down grade to a run off area. Check out this link

3) In addition to the weeping tile system there is normally (Required by code) at least 1 in floor drain that connects to your weeping tile system, if there is no in floor drain then there is required to be a sump pump mounted in the basement (Also required by code)

4) How do your rain gutters drain, do they just drain into the downspouts, and into the weeping tile system right next to your house??? take a look at this link.