Concrete and paving glossary - H
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Hand float
A wooden tool used to lay on and to smooth or texture a finish coat
of plaster or concrete. See float,
trowel and darby.
Hangers
 A
straight metal bar with pockets on an adjustable slide that allow straight
forms to be placed in areas where securing forms into position is difficult
due to soil conditions, existing pavement, or obstacles.
Hangers are often used in applications such as sidewalks, foundations,
and curb and gutter work. See straight
forms.
Hardener
The curing agent of a two-part synthetic resin, adhesive, or similar
coating. See curing.
Haunch
An extension, a knee like protrusion of the foundation wall that a
concrete porch or patio will rest upon for support.
Heat of hydration
The thermal energy, or heat, resulting from chemical reactions with
water, as in the curing of Portland cement, concrete, or gypsum, as
it cures. See concrete,
curing, hot
load, and Portland
cement.
High chair
Slang for a heavy, wire, vaguely chair-shaped device used to hold steel
reinforcement off the bottom of the slab during the placement of concrete.
See bar chair and chair.
High-pressure steam curing (autoclave curing)
The steam curing of products made from cement, sand-lime, concrete,
or hydrous calcium silicate in an autoclave at temperatures of 340°
to 420° F.
Holding period
Period in the manufacture of concrete products, the period between
completion of casting and the introduction of additional heat or the
steam curing period.
Honeycomb
A method by which concrete is poured and not puddled or vibrated, allowing
the edges to have voids or holes after the forms are removed. An area
in a foundation wall where the aggregate (gravel) is visible. Honeycombs
can be usually be remedied by applying a thin layer of grout or other
cement product over the affected area. See aggregate
and vibration.
Hot load
Construction slang used to describe ready-mix concrete that has begun
its hydration process while still in the delivery drum of the agitator
truck. Hydration causes heat build up in the concrete mix. See ready-mixed
concrete, hydration, heat
of hydration, and agitator
truck.
Hot-rolled solid steel form pins
Concrete forming metal pins that were formed by rollers from a hot
plastic state into its final shape. Hot rolled pins are characterized
by a rough, scaly surface and do not contain the tensile strength of
cold-rolled steel pins. See cold-rolled
solid steel form pins.
Hydration
The chemical reaction that occurs when cement is mixed with water.
See hot load and heat
of hydration.
Hydraulic cement
A variety of cement engineered to harden under water. See air-entrained
agent.
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