ACI Concrete Flatwork Finishing Certification
When is air-entrained concrete used? - ANS-When it will be exposed to freezing and thawing
cycles
How is concrete sold? Sold in what units? - ANS-By volume in cubic yards or cubic meters
Concrete should be completely discharged: - ANS-Within 1 1/2 hours
Who should attend the pre-construction meeting? - ANS-Finisher foreman
Type I Concrete - ANS-Normal or ordinary use
What is type I concrete typically used on? - ANS-Slab-on grade, reinforced concrete buildings,
and bridges
Type II Concrete - ANS-Moderate sulfate resistance
Where is type II concrete used? - ANS-Where moderate sulfate exposure from the soil or
groundwater must be resisted
Type III Concrete - ANS-High early strength
Type III Concrete Properties - ANS-Similar to Type I, but more finely ground, quick, develops in
a week or less.
Type IV Concrete - ANS-Low heat of hydration
When is Type IV Concrete used? - ANS-In mass concrete structures like dams
Type V Concrete - ANS-High sulfate resistance
When to use Type V concrete? - ANS-When soil or groundwater has high sulfate resistance
Fine aggregate - ANS-Particles are smaller 3/8" - either natural sand or manufactured sand
Coarse aggregate - ANS-Most of particles are bigger than 1/4" - either gravel or crushed
materials; gravel= smoothly rounded particles & crushed stone= rough angular surfaces
What is concrete made without coarse aggregate? - ANS-Motar or grout
What do accelerating admixtures do? - ANS-Speed up setting/ hardening time
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