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Technical Questions - ACI Concrete Knowledge Center  
   

Top Asked Questions
Classes A, B, C, and D — formed surfaces
Standards for 7-day and 28-day strength test results
Referencing ACI documents in specifications
Maximum temperature limits for hot-weather concreting
Limits on free fall of concrete
Floor finish tolerances — F-numbers versus the 10 ft straightedge method
Expansion joints in exterior pavements
ACI standards for floor finishes
Stripping time for forms
Resurfacing a worn concrete floor
Concrete cover required for specific fire rating
Slab-on-ground design
Estimating in-place concrete strength
What is mass concrete?
Documenting concrete compressive strength for mixture proportions
Foundation wall design
Curing strength-test cylinders
Strength test cylinder size
Cement-based repair materials
Fibers and welded-wire reinforcement in slabs-on-ground
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