Chemical admixtures how many types

Question

Accepted Answer

Chemical admixtures are substances added to concrete to enhance its properties and performance.

Chemical admixtures are used in concrete construction to improve workability, durability, and strength.
There are several types of chemical admixtures, including water-reducing admixtures, air-entraining admixtures, accelerating admixtures, and retarding admixtures.
Water-reducing admixtures reduce the amount of water needed in the concrete mix, improving its strength and workability.
Air-entraining admixtures create small air bubbles in the concrete, improving its resistance to freezing and thawing.
Accelerating admixtures speed up the hydration process of concrete, allowing for faster setting and strength development.
Retarding admixtures slow down the hydration process, extending the setting time of concrete and allowing for better workability.
Other types of chemical admixtures include plasticizers, superplasticizers, corrosion inhibitors, and shrinkage reducers.
Plasticizers increase the workability of concrete without increasing water content.
Superplasticizers are high-range water reducers that greatly improve the flowability of concrete.
Corrosion inhibitors protect reinforcing steel in concrete from corrosion caused by chloride ions.
Shrinkage reducers reduce the drying shrinkage of concrete, minimizing cracking.
The selection and use of chemical admixtures depend on the specific requirements of the concrete mix and the desired performance characteristics.

Accepted Answer

Chemical admixtures can be divided into five types: accelerating, retarding, water reducing/plasticizing, air entraining, and waterproofers.

Top Marvel Infraprojects Senior Quantity Surveyor interview questions & answers