Importance of Aggregates in Concrete

How important is the use of the right type and quality of aggregates for concrete?

• Not important

• Somewhat important

• Important but can be overemphasized

• Cannot be overemphasized

What do aggregates influence in concrete?

• Only the color of the concrete

• Only the cost of the concrete

• Only the weight of the concrete

• The freshly mixed and hardened properties of the concrete

What materials are commonly used as fine aggregate in concrete mixtures?

• Gravel and pebbles

• Sand and/or crushed stone

• Clay and silt

• Cement and water

What is the maximum particle size for most particles in fine aggregate?

• < 10 mm

• < 5 mm

• < 15 mm

• < 20 mm

What is the typical range for the content of fine aggregate in concrete by mass or volume?

• 10% to 20%

• 20% to 30%

• 35% to 45%

• 50% to 60%

What are the primary materials that constitute coarse aggregate (C.A.)?

• Sand and silt

• Gravel and crushed stone

• Cement and water

• Steel and wood

What is the typical size range for particles in coarse aggregate?

• Between 1 mm and 5 mm

• Between 5 mm and 15 mm

• Between 10 mm and 40 mm

• Between 50 mm and 100 mm

What is the minimum particle size for most particles in coarse aggregate?

• 1 mm

• 3 mm

• 5 mm

• 10 mm

Which of the following is NOT a type of rock?

• Minerals

• Igneous rocks

• Metamorphic rocks

• Sedimentary rocks

Which of the following is a mineral commonly found in aggregates?

• Granite

• Marble

• Quartz

• Limestone