6. Water – Requirements and Impurities

Try these first

1. 1.

   What is the acceptable pH range for mixing water in concrete?

   Hint

   Think of the normal range for non-acidic water.

2. 2.

   What should be the TDS limit for water used in concrete?

   Hint

   Consider how much dissolved material is acceptable.

3. 3.

   What is the maximum permissible chloride content in water for reinforced concrete?

   • 500 mg/L
   • 1000 mg/L
   • 400 mg/L

   Hint

   Reflect on chloride sensitivity in reinforced structures.

4. 4.

   True or False: Water with a pH below 6 is acceptable for mixing concrete.

   • True
   • False

   Hint

   Review acceptable ranges for chemical properties.

5. 5.

   Calculate the total dissolved solids in a sample if a water sample has 250 mg/L of chlorides, 200 mg/L of sulphates, and 100 mg/L of organic matter.

   Hint

   Add the components that contribute to dissolved solids.

6. 6.

   Design a water treatment plan for a construction site where water quality testing results show high organic content and TDS.

   Hint

   Consider the treatment methods discussed for various impurities.