Concrete and paving glossary - K
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Kelly ball
A device for determining the consistency of fresh concrete. It is sometimes
used as an alternative to the slump test. See slump,
slump cone, and slump
test.
Key
A slot formed into a concrete surface for the purpose of interlocking
with a subsequent pour of concrete.
Keyway
A recess or groove in one lift or placement of concrete that is filled
with concrete of the next lift, giving shear strength to the joint.
Also called a key.
Keyway attachments
A ten-foot long keystone-shaped metal concrete forming accessory that
attaches to standard metal forms used to create horizontal tongue and
groove connections for all types of floors and slabs. See flatwork
forms and straight
forms.
Keyway forms
Metal concrete forming devices used to pour interconnecting slabs.
They are basically standard straight forms with holes drilled along
the center face onto which a keyway is bolted and then used to pour
"keyed" slabs. When the straight forms are needed for a standard pour,
the keyway attachment is easily removed. See straight
forms.
Kiln
A furnace, oven, or heated enclosure for drying (wood), or charring,
hardening, baking, calcining, sintering, or burning various materials.
A furnace for firing clay or glass products or a heated chamber for
seasoning wood.
Knee boards
Boards used by concrete finishers to kneel on to perform hand trowel
flatwork. See trowel and
troweling.
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