finishing concrete sidewalk curbs

Posted by Tom Cular on August 31, 2008, 2:01 pm

> Tom, that is interesting reading. Thanks for the information. What
> type of admixtures are you refering to in column forms? Is the
> admixture fibers that replace the aggregate in the concrete?
> John

No, I was primarily referring to water reducers and super plasticizers.
Super P can reduce the amount of water required by 12-30% , depending on the
brand and dosage, and still produce concrete that flows and is as workable
as concrete with an 8" slump. The effects of super p dissapear in 30-60
minutes. There are several others, accelerators, retarders, air entrainment
additives, fly ash, silica fume etc., these products are generally specified
by an engineer for a particular purpose.

Posted by on August 31, 2008, 7:41 pm

Thanks Tom
John

Posted by jloomis on August 29, 2008, 10:57 am

The curb on a sidewalk is usually finished with a rotating motion of a
rubber type grout float, wood float, or magnesium float. No extra cream is
"usually" needed since you work up the cream with the motion of the trowel
to fill the voids. The best practice is to vibrate or hammer the wood form
curb area, with the wet concrete in, to remove any air pockets or "honey
combs"
Normally 3/4" rock is in the mix and with a 5 sack order. The concrete is
poured, rodded off, jittered, floated, pre-lined, let set.......finished,
lined again, and with proper timing the curb form is removed with a
"sideways" motion....
If the form is "pulled" off without hammer tapping or sideways pulling large
pieces with come off with the form......
Many like to -pre oil or use form release on the curb face form for
non-stick properties.
Working with a crew and hopefully experienced persons one will see how it
goes, and learn the timing and the methods to make finishing easier......
You still have problems no matter how careful you are, and those usually can
be repaired with the concrete on the job.
jloomisconcrete&construction

>I noticed that the forms on concrete curbs are pulled off fairly
> quickly. How do they finish these? Are they rubbed or brushed with a
> concrete slurry to get the bug holes out etc? Also, how soon after
> pouring can the curb forms be pulled.....
> Thanks
> John

Posted by on August 29, 2008, 12:05 pm

> The curb on a sidewalk is usually finished with a rotating motion of a
> rubber type grout float, wood float, or magnesium float. =A0No extra crea=

m is

> "usually" needed since you work up the cream with the motion of the trowe=

> to fill the voids. =A0The best practice is to vibrate or hammer the wood =

form

> curb area, with the wet concrete in, to remove any air pockets or "honey
> combs"
> Normally 3/4" rock is in the mix and with a 5 sack order. =A0The concrete=

> poured, rodded off, jittered, floated, pre-lined, let set.......finished,
> lined again, and with proper timing the curb form is removed with a
> "sideways" motion....
> If the form is "pulled" off without hammer tapping or sideways pulling la=

rge

> pieces with come off with the form......
> Many like to -pre oil or use form release on the curb face form for
> non-stick properties.
> Working with a crew and hopefully experienced persons one will see how it
> goes, and learn the timing and the methods to make finishing easier......
> You still have problems no matter how careful you are, and those usually =

can

> be repaired with the concrete on the job.

> >I noticed that the forms on concrete curbs are pulled off fairly
> > quickly. =A0How do they finish these? =A0Are they rubbed or brushed wit=

h a

> > concrete slurry to get the bug holes out etc? =A0Also, how soon after
> > pouring can the curb forms be pulled.....
> > Thanks
> > John- Hide quoted text -

> - Show quoted text -

Thanks jloomis, that is the information I have been looking for. This
site rocks.
John

Posted by Tom Cular on August 29, 2008, 6:17 pm

John,
Here in the northeast, with hand set forms ( about 400LF a day per crew)
( this time of the year) curb is normally placed with a 4-5" slump and 5-6%
air entrainment.

Depending upon the weather, the face forms can be removed and the curb face
(road side) hit lightly with a mag float and touched up with a whitewash
brush dipped in water, not soaked within an hour of placement.

Slip- formed curb or curb & gutter requires a slip-form machine , and is
suitable for long runs only.

> The curb on a sidewalk is usually finished with a rotating motion of a
> rubber type grout float, wood float, or magnesium float. No extra cream
> is "usually" needed since you work up the cream with the motion of the
> trowel to fill the voids. The best practice is to vibrate or hammer the
> wood form curb area, with the wet concrete in, to remove any air pockets
> or "honey combs"
> Normally 3/4" rock is in the mix and with a 5 sack order. The concrete is
> poured, rodded off, jittered, floated, pre-lined, let set.......finished,
> lined again, and with proper timing the curb form is removed with a
> "sideways" motion....
> If the form is "pulled" off without hammer tapping or sideways pulling
> large pieces with come off with the form......
> Many like to -pre oil or use form release on the curb face form for
> non-stick properties.
> Working with a crew and hopefully experienced persons one will see how it
> goes, and learn the timing and the methods to make finishing easier......
> You still have problems no matter how careful you are, and those usually
> can be repaired with the concrete on the job.
> jloomisconcrete&construction

>>I noticed that the forms on concrete curbs are pulled off fairly
>> quickly. How do they finish these? Are they rubbed or brushed with a
>> concrete slurry to get the bug holes out etc? Also, how soon after
>> pouring can the curb forms be pulled.....
>> Thanks
>> John

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finishing concrete sidewalk curbs - Page 3