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05-20-2009, 09:32 AM
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#1
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Member
Trade:
LANDSCAPER
Join Date: Dec 2006
Posts: 30
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Sidewalk pour
I'm pouring about 1/2 yards of concrete replacing a sidewalk piece. Do I have to put some material between the new concrete and the old concrete sidewalk so the stuff affixes to the old properly or just pour the concrete in?
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05-20-2009, 09:39 AM
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#2
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Pro
Trade:
Remodeling general
Join Date: Feb 2009
Location: Annapolis Md
Posts: 1,502
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you could drill into the edges of the old walk and grout in some rebar or you could just pour in the new
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05-20-2009, 10:13 AM
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#3
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Trailer park boy
Trade:
Remodeling
Join Date: Mar 2008
Location: Castlegar, BC, Canada
Posts: 1,557
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Like nap said, I would pin them.
__________________
"Industry without art is brutality"
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05-20-2009, 11:34 AM
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#4
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Pro
Trade:
LI,NY designer, new homes, renovation work, concre
Join Date: Mar 2008
Location: Long Island, NY
Posts: 4,159
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If you decide not to pin it, which would be best, At least make sure to paint the existing edge with a good wet slurry mix just prior to the pour. , you could also get in tight with a grinder and rough up the existing edge. G
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05-20-2009, 12:14 PM
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#5
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Professiona Instigator
Trade:
Design Build Remodeling Contractor Washington, DC
Join Date: Nov 2007
Location: Washington, DC/ Maryland
Posts: 6,546
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Install rebar like stated and a paint a bonding agent on the old concrete
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05-20-2009, 02:53 PM
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#6
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Thom
Trade:
General Contractor/Homebuilder
Join Date: Nov 2006
Location: Albuquerque NM
Posts: 1,929
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You guys do it different. We don't put steel in our sidewalks unless they cross a drivepad. Here we would just finish a control joint at each end or put an expansion at one end and a control joint at the other end.
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The Following 2 Users Say Thank You to thom For This Useful Post:
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05-20-2009, 04:52 PM
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#7
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Member
Trade:
carpenter
Join Date: Apr 2009
Location: virginia beach
Posts: 72
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I have never doweled sidewalk... expansion joint is all you need.. for four foot walk i cut control joints every 4 feet. dowels are mainly for transferring a load from one slab to another.. sidewalk dont carry this kind of load.
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The Following 2 Users Say Thank You to master of none For This Useful Post:
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05-20-2009, 05:58 PM
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#8
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Registered User
Trade:
Residental/Light Commercial Contractor
Join Date: May 2009
Posts: 1
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saw-cut your expansion joints
if your not tying into an existing sidewalk, no need to dowel just pour it solid. saw-cut your joints 1/4th the thickness of your slab within 4 to 12 hours of your pour. every 4' to 6' will control cracking. Be sure to edge the slab & use a broom finish.
Last edited by superdawg51; 05-20-2009 at 06:03 PM.
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05-20-2009, 10:04 PM
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#9
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Member
Trade:
carpenter
Join Date: Apr 2009
Location: virginia beach
Posts: 72
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Quote:
Originally Posted by superdawg51
if your not tying into an existing sidewalk, no need to dowel just pour it solid. saw-cut your joints 1/4th the thickness of your slab within 4 to 12 hours of your pour. every 4' to 6' will control cracking. Be sure to edge the slab & use a broom finish.
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I think you saw cut control joints. expansion is not controlled by saw cuts. if your pouring between two pieces of concrete you need to put expansion joints in... around here you need them every thirty feet
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05-20-2009, 11:57 PM
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#10
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Moore Means Quality
Trade:
General Carpentry
Join Date: Jan 2005
Location: Lynnwood,WA
Posts: 1,614
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Thom and master of none are correct. expasion joint is all that is needed. if you don't want to look of EJ then use a cap on the EJ. Tear the cap off and use caulk. Not painters caulk either.
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05-21-2009, 09:03 AM
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#11
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Trailer park boy
Trade:
Remodeling
Join Date: Mar 2008
Location: Castlegar, BC, Canada
Posts: 1,557
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Quote:
Originally Posted by master of none
dowels are mainly for transferring a load from one slab to another.. sidewalk dont carry this kind of load.
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Up here in snow land, frost will toss a small floating slab like that all over the place.
There is a very good chance that a slab like that without being pinned would be heaved after one winter and then the joints are tripping hazards.
__________________
"Industry without art is brutality"
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05-21-2009, 10:26 AM
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#12
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Professiona Instigator
Trade:
Design Build Remodeling Contractor Washington, DC
Join Date: Nov 2007
Location: Washington, DC/ Maryland
Posts: 6,546
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Quote:
Originally Posted by shanekw1
Up here in snow land, frost will toss a small floating slab like that all over the place.
There is a very good chance that a slab like that without being pinned would be heaved after one winter and then the joints are tripping hazards.
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If its not pinned and tied together with rebar in DC they would steal the sidewalk
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05-21-2009, 10:28 AM
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#13
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Pro
Trade:
Remodeling general
Join Date: Feb 2009
Location: Annapolis Md
Posts: 1,502
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Quote:
Originally Posted by rbsremodeling
If its not pinned and tied together with rebar in DC they would steal the sidewalk
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05-21-2009, 10:37 AM
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#14
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Trailer park boy
Trade:
Remodeling
Join Date: Mar 2008
Location: Castlegar, BC, Canada
Posts: 1,557
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Quote:
Originally Posted by rbsremodeling
If its not pinned and tied together with rebar in DC they would steal the sidewalk
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