9.2. Volume of Water

Try these first

1. 1.

   What is the effect of a high water-cement ratio on concrete?

   Hint

   Think about the relationship between strength and water in concrete.

2. 2.

   Define workability in concrete.

   Hint

   Consider the terms mixing and finishing.

3. 3.

   What is the ideal outcome of selecting an appropriate water-cement ratio?

   • Reduced strength
   • Increased delivery times
   • Higher durability
   • Lower workability

   Hint

   Consider what happens with optimal mixing conditions.

4. 4.

   True or False: Higher water content in concrete always lead to higher strength.

   • True
   • False

   Hint

   Reflect on the established relationship between water and concrete strength.

5. 5.

   Given a design mix requiring 150 kg of cement with a water-cement ratio of 0.55 and aggregates with 3% surface moisture, how would you calculate the total water required?

   Hint

   Start by calculating water based on cement, then factor in moisture from aggregates.

6. 6.

   You are tasked with adjusting a mix for higher workability, where the original calculation defined 200 liters of water. Considering that the desired slump increases by 25mm, how would you adjust your water needed?

   Hint

   Refer to tables or guidelines provided in IS standards regarding workability adjustments.