Construction Materials Quiz

What is the main purpose of aggregates in concrete?

• To provide color to the concrete

• To reduce the volumetric changes in concrete

• To increase the drying shrinkage of concrete

• To absorb excess water in the mix

What percentage of the concrete volume do aggregates represent?

• 10%

• 25%

• 50%

• 75%

What is the size range for fine aggregates?

• Less than 5 mm

• Between 5 mm and 10 mm

• Greater than 20 mm

• Between 10 mm and 20 mm

Which type of aggregates are those retained on the 4.75 mm sieve?

• Lightweight aggregates

• All-in aggregates

• Coarse aggregates

• Fine aggregates

What is the main advantage of using rounded aggregates in concrete?

• They increase voids content

• They reduce workability

• They absorb excess water

• They improve the strength of concrete

What is the unit weight range for normal weight aggregates?

• 2900 - 5200 Kg/m3

• 300 - 1850 Kg/m3

• 2200 - 2600 Kg/m3

• 1500 - 1850 Kg/m3

What does specific gravity of aggregates indicate?

• The mass of the aggregates including voids

• The color of the aggregates

• The density of the aggregates compared to water

• The particle size distribution of aggregates

What is the formula to calculate bulk density of aggregates?

• W/V

• Ws/V x 100

• Ws/V

• Ws/V - W

What does sieve analysis determine for aggregates?

• The water absorption of aggregates

• The porosity of aggregates

• The particle size distribution of aggregates

• The specific gravity of aggregates

What is the maximum allowable percentage of clay and fine materials in aggregates according to Egyptian Standards?

• 8%

• 4%

• 2%

• 6%