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Wed May 4 19:04:35 EDT 2016

cement patches


- clean, dust free, wet
- apply cement paint (cement+water, consistency of paint)
- fill shallow: (less than 3/8"): 2 parts sand, 1 part Portland cement
- fill deep: three parts stone, two parts sand and 1.5 parts Portland cement
- dry slowly


http://www.askthebuilder.com/repair-crumbling-concrete/

Concrete Defects  |  Concrete Installation  |  Projects text: Tim Carter

Concrete is simply artificial rock. If it's mixed, placed, finished
and cured correctly it can last 100 or more years. If your concrete
steps, walkways, patios, etc. are crumbling, you may be able to repair
them with traditional products and methods or you can choose from some
modern materials.

Often concrete deterioration is just a surface blemish. The concrete
just below the surface is still sound. If this is what's wrong at your
home, then you can patch the concrete and the patch will stay in place
for many years if you just do a few simple things.

To add a thin patch of concrete that wouldn't exceed 3/8-inch in
thickness, all you do is mix coarse clean sand with Portland
cement. The mixture should resemble bricklayer's mortar. Mix two parts
sand to one part cement to get a super-strong mixture.

The secret trick to get this material to permanently bond to your
existing concrete is to apply a coat of cement paint to the rough
concrete just a moment before you apply the patching mixture.

You make cement paint by just adding clean water to pure Portland
cement and stirring it until it's the consistency of regular latex
paint. Make sure the rough concrete is free of all dust and lightly
spritz it with water before applying on the cement paint.

Once the patching mixture starts to stiffen up, you can use a wood
trowel or magnesium or steel float to match the texture of the
surrounding concrete.

Be sure to cover the patch with plastic for at least three days after
you pour it. Try to keep the patch wet for the three days by spritzing
it with water and covering it once again with the plastic so the
concrete patch stays damp.

To repair deeper concrete defects or to replace chunks of missing
concrete, just add small stones to your mix. The ratio should be three
parts stone, two parts sand and 1.5 parts Portland cement for a strong
mix. Always use the cement paint to bond your new concrete to your
old.

Modern epoxies are available that also make great repairs. Simply
purchase epoxies that are clearly labeled as concrete patching
materials and follow the directions on the label for amazing results.



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