Assignments

Exercise 1.Read the text carefully and fill in the table to compare mechanical and chemical characteristics of different types of concrete.

Characteristics Type of concrete	Compressive strength, psi	Aggregates/ ingredients	Properties	Spheres of application
Light-weight concrete	extra-light- weight
intermediate lightweight
structural lightweight
High Strength Concrete (HSC)
High Performance Concrete (HPC)

Exercise 2.Answer the following questions.

1. What affects the properties of lightweight concrete?

2. What is silica fume which is used for manufacturing HSC?

3. Why must HSC be mixed and placed with care?

4. What are the beneficial effects of HPC application to high-rise buildings?

Exercise 3. Make up a short summary of the text.