Adding Control Joints and Edging
When pouring a concrete walkway, you'll need to create control joints and edging joints, both of which help to control cracking.
PROJECT BASICS ...
control joint (joint de retrait, m.) A joint tooled or cut into the surface of concrete in order to control the location of cracks due to expansion and contraction.
Control Joint
Vertical joint made in the wall to allow for shrinkage movement. Used to prevent random cracking of the wall caused by contraction. See also expansion joint.
Control Joint:
Provision for the dimensional change of different parts of a structure due to shrinkage, expansion, temperature variation, or other causes to avoid the development of high stresses. (Expansion/Contraction Joint)
Coping: ...
CONTROL JOINT - A control joint controls or accommodates movement in the surface component of a roof.
CONVECTION - A method of transferring heat by the actual movement of heated molecules, usually by a freestanding unit such as a furnace.
Control joint " Tooled, straight grooves made on concrete floors or structures to "control" where the concrete should crack (as a result of shrinkage).
Control joint: A continuous unbonded masonry joint that is formed, sawed or tooled in a masonry structure to regulate the location and amount of cracking and separation resulting from dimensional changes of different parts of the structure, ...
CONTROL JOINT: A groove which is formed, sawed, or tooled in a concrete or masonry building to regulate the location and amount of cracking and separation resulting from the dimensional change of different parts of the building.
CONTROL JOINT: Continuous, vertical joint in masonry walls to control cracking.
CONVECTOR: A heat-transfer surface that uses convection currents to transfer heat.
COPING: Metal cap or masonry top course of a wall.
Control joints - See Movement-control joints.
Conveyancing - The process of transferring the ownership of any property or real estate from one person to another.
Control Joint: Grooves made on concrete floors to "control" where the concrete should crack.
Convection: Currents created by heating air, which rises and pulls cooler air behind it.
control joint examples
Related Posts to Build Your Own Home:
Driveways on Curbed Streets
Pouring Flatwork
Cutting Curbs and Sidewalks
Concrete Slab Estimating
Bricklaying ...
Control joint in metal railing to allow differential movement of railing components from thermal expansion and contraction.
Railing Fitting ...
CONTROL JOINT
A straight line joint placed in concrete to form a plane of weakness to prevent random cracks from forming due to shrinkage or stress.
Control joints
Grooves that are tooled or cut into the surface of wet concrete to make it crack in straight lines at planned locations, rather than cracking randomly.
Coped cut ...
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GA-234-98, Control Joints for Fire-Resistance Rated Systems by the Gypsum Association, Washington, DC, 1998.—Up-to-date recommendations addressing special uses of control joints.
Good edging and placement of control joints will prevent cracking and chipping.
Edging
When the concrete has stiffened slightly (and foot pressure leaves only about a ¼ inch indentation ) you can begin edging.
Using a 2x4 as a guide, control joints are cut with a jointer, which resembles a trowel with a blade in the center. At this point the concrete is firm enough to support some weight but still wet enough to be worked.
Note: When performing a resurfacing, remember that the control joints that were placed in the concrete are there for a purpose and should not be covered with the resurfacing material.
Jim Peterson, President of Concrete Network comments, "Although concrete is prone to crack, this can largely be controlled by incorporating control joints into a decorative scoring design.
In case of concrete block walls, let the mortar cure for at least 14 days before applying any sealing material. Any visible cracks in the concrete are to be checked for leaks, the floor-to-wall joints, expansion control joints in the floor, ...
 See also: Concrete, Water, Home, Wood, Ground
  
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