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Technical Questions - ACI Concrete Knowledge Center  
   

Top Asked Questions
Standards for 7-day and 28-day strength test results
Classes A, B, C, and D — formed surfaces
Expansion joints in exterior pavements
Maximum temperature limits for hot-weather concreting
Referencing ACI documents in specifications
Limits on free fall of concrete
Concrete cover required for specific fire rating
What is mass concrete?
Stripping time for forms
Floor finish tolerances — F-numbers versus the 10 ft straightedge method
Documenting concrete compressive strength for mixture proportions
What does type of fracture tell us about the cylinder test result?
ACI standards for floor finishes
Resurfacing a worn concrete floor
Strength test cylinder size
Emergency Construction Joint Procedures
Rapid Chloride Permeability Tests
Slab-on-ground design
Estimating in-place concrete strength
Can floors be accepted or rejected based on FF or FL results from one sample measurement line?
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