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Concrete and paving glossary
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Concrete and paving glossary - R

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Radius (steel) forms

Metal forms used forming radius shapes such as islands, serpentine sidewalks, curved curbs, parking lot turnouts, and similar applications. See flexible forms.

Reactive aggregate

Aggregate containing substances capable of reacting chemically with the products of solution or hydration of the Portland cement in concrete or mortar, under ordinary conditions of exposure, resulting in harmful expansion, cracking, or staining.

Ready-mixed concrete

Concrete that is batched or mixed at a central plant before it is delivered to a construction site and delivered ready for placement. It is also known as transit-mixed concrete since it is often transported in an agitator truck. See agitator truck.


The reinforcing bar-ribbed steel bars installed in foundation concrete walls, footers, and poured in place concrete structures designed to strengthen concrete. Rebar comes in various thickness' and strength grade. The term rebar is short for reinforcing bar.

Refractory concrete

Concrete having refractory properties, suitable for use at high temperatures. Calcium-aluminate cement and refractory aggregates are normally used for the manufacture of this product.

Rehab forms

Light-weight extend angle-iron-shaped metal forms, often 10' long with a 2' top rail and no bottom rail, used to replace sections of sidewalk without extensive excavation of surrounding soil. Rehab forms slip into place and are anchored into place with stakes after removal of the damaged concrete.

Reinforced concrete

Concrete reinforced by the addition of steel bars making it more able to tolerate tension and stress. See pre-stressed concrete.

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Release agent

Material used to prevent bonding of concrete to a surface, such as to forms. See bond breaker, form release agent.


The addition of water and remixing of concrete which has started to stiffen. This is usually not allowed as it may affect the ultimate strength.

Reversible forms

A formed metal channel that is a combination of two sizes of straight forms. A 90° angle is formed which each leg having a different height. This type of form is used when a concrete contractor needs to pour two slabs of different heights. One side of the form might have a height of 10" and the other side might have a height of 14". This variation allows the one set of forms to be used to pour two different slabs. See straight forms.


Delayed vibration of concrete that has already been placed and consolidated. This is most effective when done at the latest time a running vibrator will sink of its own weight into the concrete and make it plastic and workable again.

Road base

An aggregate mixture of sand and stone. See aggregate.

Road forms

Heavy duty 3/16" or 1/4" metal paving forms capable of supporting large screed machines. The screed machines ride on the top rails of the paving forms to level the concrete.

Rock pocket

Area or portion of hardened concrete which is deficient in mortar and consisting primarily of coarse aggregate and open voids; caused by insufficient consolidation or separation during placement, or both; by leakage from form. See aggregate.

Rod (tamping)

A round, straight steel rod, 5/8" in diameter and approximately 24" in length, having the tamping end rounded into a hemispherical tip, with a tip diameter of 5/8".


Compaction of concrete or the like by means of a tamping rod. See compaction.


Producing a concrete curb by hand shaping or hand rolling the curb without the use of face forms. See face forms.

Rotary float (power float)

Motor-driven revolving blades that smooth, flatten, and compact the surface of concrete slabs or floor toppings. See screed, float, floating, trowel, and darby.


Decking over an area of concrete placement, usually of movable panels and supports, on which buggies of concrete travel to points of placement.

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