Bricks, Masonry, Asphalt and Concrete - New sidewalk over existing
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Wayne Mitchell
10-02-09, 08:23 AM
I am planning a new poured concrete walkway and I have a couple of questions.
My existing walk consists of 3'X5'X4" concrete slabs with exposed aggregate. The slabs are separated by PT 2X lumber. Steps are 6X PT ties. I want to remove all the PT and pour a continuous walkway on top of the existing concrete. my plan is to add 3" of concrete and use control joints every 4'. Do I have to be concerned with a bond between the existing and the new pour? Can I get away with 2" over the slabs instead of 3"?
My other question has to do with slope. I will be adding an additional 15' to the existing walk. This new walk is sloped nearly 2'. Can I make this pour continuous or will the concrete flow down the slope?
My existing walk consists of 3'X5'X4" concrete slabs with exposed aggregate. The slabs are separated by PT 2X lumber. Steps are 6X PT ties. I want to remove all the PT and pour a continuous walkway on top of the existing concrete. my plan is to add 3" of concrete and use control joints every 4'. Do I have to be concerned with a bond between the existing and the new pour? Can I get away with 2" over the slabs instead of 3"?
My other question has to do with slope. I will be adding an additional 15' to the existing walk. This new walk is sloped nearly 2'. Can I make this pour continuous or will the concrete flow down the slope?
dtrimmer
10-22-09, 05:49 AM
Wayne,
I noticed you had no replies to your query and I thought I would chip in what I did know while you wait for someone to give a more complete answer.
The new cement will NOT bond with the existing cement. To connect them, drill holes in the existing cement (hammer drill and masonry bit -- get the best quality bits you can find -- hard cement and aggregate will chew up a cheap bit real fast. Bosh masonry bits are the best brand I have found at home improvement stores) and cement anchors (Simpson makes anchors and epoxy). I don't know if it's recommended but you might be able to save a few bucks by using rebar with the epoxy.
It is possible to pour a 15' by 2' rise sidealk in one pour. However, if you don't pour cement for a living, you might not want to try this yourself. I once tried to pour a more gentle slope myself and it was a disaster. When I hired the pros to fix my mess, they made it look easy.
Cheers,
Don
I noticed you had no replies to your query and I thought I would chip in what I did know while you wait for someone to give a more complete answer.
The new cement will NOT bond with the existing cement. To connect them, drill holes in the existing cement (hammer drill and masonry bit -- get the best quality bits you can find -- hard cement and aggregate will chew up a cheap bit real fast. Bosh masonry bits are the best brand I have found at home improvement stores) and cement anchors (Simpson makes anchors and epoxy). I don't know if it's recommended but you might be able to save a few bucks by using rebar with the epoxy.
It is possible to pour a 15' by 2' rise sidealk in one pour. However, if you don't pour cement for a living, you might not want to try this yourself. I once tried to pour a more gentle slope myself and it was a disaster. When I hired the pros to fix my mess, they made it look easy.
Cheers,
Don