6.3.5. Acids and Alkalis

Try these first

1. 1.

   What is an acid?

   Hint

   Think about substances that can corrode or break down materials.

2. 2.

   What does high alkalinity affect in concrete?

   Hint

   Consider what protects steel within concrete.

3. 3.

   What do acids do to concrete?

   • Strengthen the matrix
   • Deteriorate the material
   • Have no effect

   Hint

   Think about corrosive properties.

4. 4.

   True or False: Alkalis can damage the protective layer around steel.

   • True
   • False

   Hint

   Recall interactions between steel and alkaline environments.

5. 5.

   You are tasked with assessing a construction site near an industrial zone. The water source shows a pH of 5.5. As an engineer, how would you approach the problem?

   Hint

   Consider the implications of acidic water on construction.

6. 6.

   A reinforced concrete structure is showing signs of rapid corrosion. What steps would you take to diagnose the impact of alkalis in the materials used?

   Hint

   Look for the connection between alkaline levels and the observed damage on the structure.