4.6. Dosage and Addition Procedure

Try these first

1. 1.

   What is the typical dosage range for chemical admixtures expressed as a percentage?

   Hint

   Think about the small numbers in percentages.

2. 2.

   What is one method of adding admixtures to concrete?

   Hint

   Consider how ingredients are usually mixed together.

3. 3.

   What is the common dosage range for chemical admixtures by weight?

   • 0.1% to 1%
   • 0.2% to 2%
   • 1% to 5%

   Hint

   Think about small percentages for precise additions.

4. 4.

   True or False: Admixtures should always be mixed thoroughly to ensure uniform distribution.

   • True
   • False

   Hint

   Consider how mixing ingredients works in cooking.

5. 5.

   Design a concrete mix that requires a high-range water reducer at a dosage of 1.2% for a batch containing 150 kg of cement. Calculate the amount of the admixture needed.

   Hint

   Use the formula dosage percentage multiplied by total weight.

6. 6.

   Discuss the impact of inconsistent mixing methods on the properties of concrete that includes various admixtures.

   Hint

   Relate this to cooking inconsistencies.