I have a pulled up broken concrete path. I want to use the pieces to build a low garden edging and mowing strip. I would like to use new cement as the mowing strip and cement the broken concrete together, maybe 2 rows high, as the built up edge of the garden. I believe concrete, while strong, does not adhere concrete to concrete. Help, what do I use as the glue for this job? Is there a special mortar that I should use?
jacinda2059,
Jun 29, 9:11pm
just buy a bag of morter mix, or make your own, sand and cement.make a slurry mix with water and cement and paint on the bottom piece of concrete when joining the two pieces together, then place your mortor ,
tintop,
Jun 29, 9:36pm
The secret is to ensure that both faces of the concrete are scrupulously clean, and primed with neat cement grout before placing on the bedding concrete mix or mortar bed. The grout is just cement and water - mixed to a creamy consistency, that can be painted/scrubbed in using a stiff brush.
kcc55a,
Jun 29, 11:16pm
Mortar
ladiesfingers,
Jun 30, 8:33am
Ok so I scrub my broken concrete. It sounds like I use two types of cement? I put down my mowing strip (cement) and then load neat cement (mortor) onto the broken concrete piece that I sit on the back of the mowing strip to start forming my wall. When I do my next row of broken concrete do I just use mortar for all the "glue" between every piece? Sorry, just trying to understand. This help is invaluable and I want to do a good job.
upnorth,
Jun 30, 7:25pm
If you look closely at a brick wall you'll see that cement mortar does not stick bricks together, it sticks them apart.
jacinda2059,
Jun 30, 8:15pm
yes, just use the mortor, dont make it to wet, just place next piece on top, and tap down level, do all bottom layer first, fill the gaps between the concrete onthe top layer. clean off any cement with a damp sponge
skin1235,
Jul 1, 5:52am
first lay the mowing strip with normal concrete, then a week or so later begin the wall building, its a two part process, make a soup with straight cement, use that as a scrub to 'prime' the pieces then add the mortar so all gaps are filled when you place them down, scrub off any excess
if you add a tablespoon of dishwash to the plaster as you mix it, it will promote a good sticky mix ( craft-glue ((PVA)) actually does a better job ) and it helps keep the mortar 'plastic' for longer
charie4,
Dec 3, 6:57am
Make sure your pieces of concrete are wet too.
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