![]() Since this discussion is about best way to bond concrete, we will assume that your slab is good. The solution to all of these problems involves a jackhammer and several bags of Sakrete concrete mix. If it has multiple cracks that run so deep that they appear to run through the slab, a repair would only be temporary. If the 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 a sidewalk has either heaved or dropped at almost every joint, repairing it will not provide a long-term solution. Repair or replace? Determine if the concrete is structurally sound. ![]() ![]() When patching existing concrete, here’s how to achieve a strong and lasting bond between the new and old concrete. Portland cement concrete works well in mass and provides great compressive strength but not bond. There is nothing in basic portland cement that will act as a bonding agent. Fact: Fresh wet concrete does not normally bond well to existing dry concrete.ĭo 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.
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