Fresh Concrete Properties Quiz

What percentage of the volume of concrete does cement paste or cementing material represent?

• 75%

• 50%

• 100%

• 25%

What are the three main characteristics of workability in fresh concrete?

• Consistency, Density, Viscosity

• Setting, Hardening, Shrinkage

• Slump, Segregation, Bleeding

• Mobility, Compactability, Cohesiveness

What does the slump test measure in fresh concrete?

• Consistency

• Density

• Durability

• Strength

What does a collapse slump in the slump test indicate?

• Lack of cohesion

• Very dry mixes

• Very wet mixes

• Excellent cohesiveness

What is the effect of water content on workability in fresh concrete?

• Increases strength

• No effect on slump

• Decreases slump

• Increases slump

What is the main factor affecting workability in fresh concrete?

• All of the above

• Cement content

• Aggregate size

• Admixtures

What is the cause of plastic shrinkage cracking in fresh concrete?

• Low concrete temperature

• Lack of curing

• Rapid evaporation of surface moisture

• Excessive compaction

What is the effect of aggregate surface texture on workability in fresh concrete?

• Smooth aggregates require more water

• Angular aggregates require more water

• Angular aggregates require less water

• Smooth aggregates require less water

What is the purpose of the slump test in fresh concrete?

• To assess setting time

• To determine durability

• To detect changes in workability

• To measure strength

What is the main factor causing segregation in fresh concrete?

• Excessive compaction

• Lack of curing

• Low concrete temperature

• Rapid evaporation of surface moisture