ACI Concrete Flatwork Finishing
Certification Exam Questions and
Answers5
When is air-entrained concrete used? - ANSWERS-When it will be exposed to freezing and
thawing cycles
How is concrete sold? Sold in what units? - ANSWERS-By volume in cubic yards or cubic meters
Concrete should be completely discharged: - ANSWERS-Within 1 1/2 hours
Who should attend the pre-construction meeting? - ANSWERS-Finisher foreman
Type I Concrete - ANSWERS-Normal or ordinary use
What is type I concrete typically used on? - ANSWERS-Slab-on grade, reinforced concrete
buildings, and bridges
Type II Concrete - ANSWERS-Moderate sulfate resistance
Where is type II concrete used? - ANSWERS-Where moderate sulfate exposure from the soil or
groundwater must be resisted
Type III Concrete - ANSWERS-High early strength
, Type III Concrete Properties - ANSWERS-Similar to Type I, but more finely ground, quick,
develops in a week or less.
Type IV Concrete - ANSWERS-Low heat of hydration
When is Type IV Concrete used? - ANSWERS-In mass concrete structures like dams
Type V Concrete - ANSWERS-High sulfate resistance
When to use Type V concrete? - ANSWERS-When soil or groundwater has high sulfate resistance
Fine aggregate - ANSWERS-Particles are smaller 3/8" - either natural sand or manufactured sand
Coarse aggregate - ANSWERS-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? - ANSWERS-Motar or grout
What do accelerating admixtures do? - ANSWERS-Speed up setting/ hardening time
Where are accelerating admixtures useful? - ANSWERS-In cold weather
What tool to use on granular subleases and sandy soils? - ANSWERS-Vibratory plate compactor
What tool to use on a clay sublease? - ANSWERS-Sheepsfoot roller
Certification Exam Questions and
Answers5
When is air-entrained concrete used? - ANSWERS-When it will be exposed to freezing and
thawing cycles
How is concrete sold? Sold in what units? - ANSWERS-By volume in cubic yards or cubic meters
Concrete should be completely discharged: - ANSWERS-Within 1 1/2 hours
Who should attend the pre-construction meeting? - ANSWERS-Finisher foreman
Type I Concrete - ANSWERS-Normal or ordinary use
What is type I concrete typically used on? - ANSWERS-Slab-on grade, reinforced concrete
buildings, and bridges
Type II Concrete - ANSWERS-Moderate sulfate resistance
Where is type II concrete used? - ANSWERS-Where moderate sulfate exposure from the soil or
groundwater must be resisted
Type III Concrete - ANSWERS-High early strength
, Type III Concrete Properties - ANSWERS-Similar to Type I, but more finely ground, quick,
develops in a week or less.
Type IV Concrete - ANSWERS-Low heat of hydration
When is Type IV Concrete used? - ANSWERS-In mass concrete structures like dams
Type V Concrete - ANSWERS-High sulfate resistance
When to use Type V concrete? - ANSWERS-When soil or groundwater has high sulfate resistance
Fine aggregate - ANSWERS-Particles are smaller 3/8" - either natural sand or manufactured sand
Coarse aggregate - ANSWERS-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? - ANSWERS-Motar or grout
What do accelerating admixtures do? - ANSWERS-Speed up setting/ hardening time
Where are accelerating admixtures useful? - ANSWERS-In cold weather
What tool to use on granular subleases and sandy soils? - ANSWERS-Vibratory plate compactor
What tool to use on a clay sublease? - ANSWERS-Sheepsfoot roller
