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AmerCable Incorporated

Articles - Flooring


Materials selection guide

Whether you are referring to metallic, mineral, steel, or iron ore aggregates, it is important to remember that they can be used to strengthen industrial floor surfaces. The material is broadcast onto and worked into the surface of wet concrete. One thing that separates them from dry shake hardeners is grain size. Dry shakes are well graded, and generally smaller than these aggregates. The coarseness, up to pea gravel or larger, adds to their durability.

Trap rock is a familiar example of mineral or metallic aggregate. It is usually a basaltic or diabasic aggregate known for being dense and wear resistant. It tends to be usually locally derived. Iron ore aggregate is also dense and wear resistant, and is available in the north central part of the United States. Colorquartz Accent Stone by 3M and its Indag product would also qualify as metallic aggregate. These heavier (or denser) aggregates are similar to those used in heavyweight concrete or radiation shielding applications. For a description of how to use trap rock (and other mineral or metallic aggregates) see "Trap Rock Aggregate for Floor Construction" (CONCRETE CONSTRUCTION, October 1988).

Floor Classifications (adapted from Table 2.1 ACI 302.1R-04)

Class   Usual traffic



Exposed surface--foot traffic - decorative

Offices, churches, commercial

Covered surface--foot traffic with floor coverings

Office, churches, commercial

Exposed or covered

Unbonded or bonded topping

Exposed or covered--light vehicular traffic

Institutional or commercial,

Exposed surface-- industrial vehicular traffic

Industrial floors,

Exposed surface--heavy duty

Hard wheels, heavy loads

Exposed surface--heavy duty

Bonded two-course floors, for heavy traffic and impact

Exposed surface--heavy duty

Unbonded topping

Exposed surface--superflat

Narrow-aisle, high-bay warehouse

Class   Special consideration

Final finish

Uniform finish, nonslip or colored aggregate

Normal steel--troweled finish

Flat slabs for applied coverings

Light steel--troweled finish

Unbonded: bondbreaker on slab
Bonded: properly sized aggregate

Normal troweled finish for topping

Level slab for covering, nonslip aggregate for       specific areas

Steel--troweled finish

Uniform subgrade, joint layout, abrasion resistance,

Hard steel--troweled finish

Uniform subgrade, joint layout, load transfer,        abrasion resistance, curing

Metallic or mineral aggregate repeated hard steel troweling

Mineral or metallic aggregate surface hardener applied to high-strength plain topping

Power floats are optional, hard steel-troweled finish

Bondbreaker on slab, abrasion resistance

Hard steel-troweled finish

Various special procedures

Place in strips


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