Pfeda Synthetics Engineer Trainee Interview Questions and Answers

Admixtures are substances added to concrete to enhance its properties. They can be classified into different types.

• Water-reducing admixtures: reduce the amount of water needed for a given concrete mix

• Retarding admixtures: delay the setting time of concrete

• Accelerating admixtures: speed up the setting time of concrete

• Air-entraining admixtures: introduce tiny air bubbles to improve workability and durability

• Superplastici...read more

Mineral admixtures have several disadvantages in construction.

• Mineral admixtures can affect the workability of concrete, making it more difficult to handle and place.

• They may increase the setting time of concrete, leading to delays in construction.

• Some mineral admixtures, such as fly ash, can have a negative impact on the strength and durability of concrete.

• Mineral admixtures may introduce variability in concrete prope...read more

The water cement ratio is affected by the addition of admixture.

• The water cement ratio is the ratio of the weight of water to the weight of cement in a concrete mix.

• When an admixture is added, it can change the properties of the concrete mix, including the water cement ratio.

• Some admixtures, such as water-reducing admixtures, can decrease the water cement ratio by allowing for a lower water content while maintaining wo...read more

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