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Classification of Concrete Floors Based on Intended Use

Class Anticipated
Traffic Type
Use Special
Considerations
Final Finish
1. Single Course Exposed Surface - foot traffic Offices, churches, commercial, institutional, multi-family Uniform finish, non-slip aggregate in specific areas, curing Normal steel troweled finish, non-slip finish where required
1. Single Course--Decorative Exposed Surface - foot traffic Decorative concrete Colored mineral aggregate, color pigment or exposed aggregate, stamped or inlaid patterns, artistic joint layout, curing As required
2. Single Course Covered surface - foot traffic Offices, churches, commercial, institutional, multi-family with floor covering Flat and level slabs suitable for applied coverings Light steel troweled finish
3. Two course Exposed or covered surface--foot traffic Unbonded or bonded topping over base slab for commercial or non-industrial buildings where construction type or schedule dictates Base Slab - gooduniform level surface, curing

Unbonded topping– bondbreaker on base slab, min thickness 3 in., reinforced, curing

Bonded Topping - properly sized aggregate, ¾ in. min thickness, curing
Base slab - troweled finish under unbonded topping; clean textured surface under bonded topping

Topping - for exposed surfaces, normal steel-troweled finish. For covered surface light steel-troweled finish.
4. Single Course Exposed or covered surface—foot and light vehicular traffic Institutional or commercial Level and flat slab suitable for applied coverings, nonslip aggregate for specific areas, curing. Coordinate joints with applied coverings Normal steel-troweled finish
5. Single Course Exposed surface—industrial vehicular traffic—pneumatic wheels and moderately soft solid wheels Industrial floors for manufacturing, processing, and warehousing Good uniform subgrade, joint layout, abrasion resistance, curing Hard steel-troweled finish
6. Single Course Exposed surface—heavy-duty industrial vehicular traffic—hard wheels and heavy wheel loads Industrial floors subject to heavy traffic; may be subject to impact loads Good uniform subgrade, joint layout, load transfer, abrasion resistance, curing Special metallic or mineral aggregate surface hardener; repeated hard steel-troweling
7. Two course Exposed surface—heavy-duty industrial vehicular traffic—hard wheels and heavy wheel loads Bonded two-course floors subject to heavy traffic and impact. Base slab - good uniform subgrade, reinforcement, joint layout, level surface, curing

Topping - composed of well-graded all mineral or all-metallic aggregate. Minimum thickness 3/4 in.; mineral or metallic aggregate surface hardener applied to high-strength plain topping to toughen, curing
Clean, textured base slab surface suitable for subsequent bonded topping. Special power floats for topping are optional, hard steel-troweled finish
8. Two course As in Classes 4, 5, or 6 Unbonded topping—on new or old floors where construction sequence or schedule dictates. Bondbreaker on base slab, minimum thickness 4 in., abrasion resistance, curing As in Classes 4, 5 or 6

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