ECS246 Topic 2.3 Aggregates

State 1 properties of aggregates

Which one of the materials do not belong into aggregates?

• Sand

• Clay

• Gravel

• Crushed stone

Which process does need to be done first to produce aggregates?

• Screening

• Washing

• Crushing

• Blending

All-in-aggregates are the mixture of coarse and fine aggregates. What type does All-in-aggregates belong to?

• Lightweight aggregates

• High density of aggregates

• Normal aggregates

Does shape and surface texture of an aggregates affect water content in the mix?

• Yes

• No

Which type of surface for aggregates produce strong concrete?

• Polished surface

• Rough surface

Grading of aggregates obtained by using a specific test. Name the test.

Which one of the factor do not affects bulk density of aggregates?

• Moisture content

• Specific gravity

• Size

• Grading

Which one of the following does not belong to thermal properties of aggregates?

• Coefficient of thermal expansion

• Specific heat

• Thermal conductivity

• Coating

Which deleterious substance in aggregates cause corrosion of reinforcement?

hint:

i) salt in concrete absorbed water from air & flow

out of concrete

ii) unsound particles lead to disruptive expansion on exposure to water

• Salt

• Unsound Particles