Consider the following statements in respect of ‘mixers’ 1. Mass batch mixing of ingredients is the most desirable method. 2. Charging all materials into a drum mixer is done ‘at once’. 3. The quantity of material fed into a mixer should be not more than the quantity that can be used in less than 30 minutes after completion of mixing. 4. Reversing mixers have less capacity than tilting mixers. 5. In large mixers, additional time of mixing is allowed. Which of the above statements are correct?
Consider the following statements in respect of ‘mixers’ 1. Mass batch mixing of ingredients is the most desirable method. 2. Charging all materials into a drum mixer is done ‘at once’. 3. The quantity of material fed into a mixer should be not more than the quantity that can be used in less than 30 minutes after completion of mixing. 4. Reversing mixers have less capacity than tilting mixers. 5. In large mixers, additional time of mixing is allowed. Which of the above statements are correct? Correct Answer 1, 3 and 5
Statement 1: Correct
Weigh batching: As per IS 456: 2000, Mass or weigh batching is most preferable. It is the correct method of measuring the materials. For important concrete, invariably, the weigh batching system should be adopted.
The use of a mass system in batching facilitates accuracy, flexibility, and simplicity. Different types of weighing batches are available, the particular type to be used, depends upon the nature of the job. Large weigh batching plants have automatic weighing equipment.
Statement 2: Incorrect
Dry mixing is the mixing that occurs during loading but before water is introduced. Wet mixing is the mixing after or while water is being introduced, but still during loading. This means that materials are introduced any time during the loading period: all before the water, all after the water, partially before and partially after.
Drum is continuously charged by materials up to the desirable mix.
Statement 3: Incorrect
Statement 3: Incorrect
Statement 3: Incorrect
