Fresh & Hardened Concrete

The accumulation of water on the outer surface of the concrete is:

• Transpiration

• Bleeding

• Seggregation

• Ponding

Who invented Portland cement and in which year?

• William Aspdin, 1824

• William Aspdin, 1840s

• Joseph Aspdin, 1840s

• Joseph Aspdin, 1824

Time elapsed from the instance of adding water until paste ceases to behave as fluid is called:

• Initial setting time

• Final setting time

• Intermediate setting time

• Absolute setting time

Which of the following adds a quick-setting property to cement?

• Magnesium oxide

• Silicon dioxide

• Iron oxide

• Aluminium oxide

In the figure below, what does ‘a’ represents?

• Combustion chamber

• Wash mill

• Kiln

• Dryer

In the figure what is ‘b’ and its function

• Water-plasticity

• Lime-strength

• Sulphur-soundness

• Gypsum-control setting

The initial setting time of concrete should be less than 30 minutes

• True

• False

The final setting time of Concrete should be not more than 10 hours

• True

• False

How much does a bag of cement weigh?

• 25 kg

• 40 kg

• 50 kg

• 100 kg

Fill in Blank below the manufacture process of concrete

Batching - Mixing -Transporting - (a)   - Compacting