Key Way For Concrete – Impressive Info 2021

If you are in the construction industry, then it is likely that you have come across a need for key way for concrete at some point. This article will provide an introduction to what keyways are and how they can be used on your project site. We’ll also go over the different types of keys and their uses. If you’re looking for more information or would like to speak with us about this topic, contact our team today!

What is key way for concrete?

What is key way for concrete?
What is key way for concrete?

Keyway is an airspace between the concrete floor and the metal beam/column. It serves to reduce de-bonding (the separation of concrete from steel) and corrosion (rust) in reinforced concrete floors due to slight expansion and contraction of reinforcing steel bars that results in bowing or planar cracking at points where reinforcing steel touches the slab. The keyway must be properly grouted which prevents moisture absorption by surrounding concrete, allowing for thermal movement without damage to the structure.

The keyway must also be wide enough to accommodate the expected maximum steel movement without crushing the grout or allowing too much concrete to spall off the beam/column. The width of a keyway is typically 1/2 inch (13 mm) wider than the diameter of the reinforcing bars.

How many types of keyways are there?

How many types of keyways are there?
How many types of keyways are there?

There are three types of keyways: edge, groove, and saw-cut. Edge keyways are cut into the concrete slab using a diamond blade wet saw. Groove keyways are cut into the top surface of the slab using a diamond blade hand saw. Saw-cut keyways are grooved by drilling a series of closely spaced holes down into the slab and then prying out resulting chips with a chisel.

The type of keyway to use is based on the reinforcing steel configuration, the slab thickness, and the column/beam size. Edge keyways are used when the reinforcing steel is located at the edge of the slab. Groove keyways are used when the reinforcing steel is located in the middle of the slab. Saw-cut keyways are used when the reinforcing steel is located near the column/beam.

The construction of a reinforced concrete floor typically starts with the installation of metal beams or columns. The beams/columns are then temporarily supported by shoring and the concrete slab is poured around them. After the concrete has hardened, the shoring is removed and the beam/column becomes a permanent part of the structure.

How to make it?

How to make it?
How to make it?

Keyway is a groove cut into the surface of concrete with specified dimensions. The purpose of a keyway is to provide a strong bond between the two adjoining surfaces of concrete. This helps reduce the chances of cracking under load. The dimensions of a keyway depend on the grade and thickness of concrete, as well as the type of reinforcement used. It is important to get these dimensions correct for maximum bonding strength.

There are various ways to make a keyway. One way is to use a T-bar or Angle grinder with a diamond blade. Another way would be using a chisel and hammer. The grooves can also be made using specialised machine.

A plain keyway groove in a concrete surface is generally made using a T-bar or an Angle grinder but careful attention should be given when making it to obtain the required dimensions. The depth, width and angle of cut depend on the type and grade of concrete used, as well as size and type of reinforcement. Hence, it is important to get these dimensions correct for maximum bonding strength.

The normal practice for plain keyways is to have a depth of 1/3 to ½ the thickness of slab or beam being served, with a suitable allowance for mortar joint (1/8″ – 3/16 power power tools tools ( (picturepicture).). But But some some of of these these power tools and techniques require specialised skills and can be expensive.

Tips when using key way for concrete.

Tips when using keyway for concrete.
Tips when using keyway for concrete.
  • When cutting the keyway, always use a diamond blade or masonry bit to avoid chipping the concrete.
  • Make sure that the keyway is at least 1/8″ deep and 3/8″ wide.
  • Always use a sharp, pointed tool when cleaning out the keyway.
  • The concrete keyway should be about 2 inches wide and 6 inches deep. It is important that the sides of the keyway are vertical and smooth so that the formwork can be easily removed.
  • Be sure to compact the concrete around the keyway to ensure good bonding between the keyway and the surrounding concrete.
  • A metal dowel can be inserted into the keyway to provide reinforcement.
  • If a steel reinforcing bar is used, it should be bent into a “U” shape so that it fits snugly inside the keyway.

FAQs about key way for concrete

FAQs about key way for concrete
FAQs about key way for concrete

What is the most common size of kegway used ?

The most common kegway is 5/8″ diameter by 1 inch long, however there are many other sizes available.

Keyway for concrete is not only one specific shape or style; there are many types manufactured with different features and benefits. Please contact us with your kegway needs so we can provide you the best solution.

How deep does a keyway need to be installed?

There is no magic depth required for installing keyways, but if you want them to last longer in an oversize hole, it’s best to install the keyway at least 3 inches into the wall of the hole (regardless of what size keyway you use).

To Sum Up

Above are all information about keyway for concrete. If you have any questions about this topic, feel free to leave a comment below. Thank you for reading.

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