Good quality aggregate must be clean, hard, strong, and have durable particles. It should also be free of any absorbed harmful chemicals, clay coatings, or other contaminants that may affect cement hydration or reduce paste-aggregate bonding. Classification is important when it comes to determining the particle size distribution for the aggregate. Leveling limits and maximum aggregate size are specified as these properties affect the amount of aggregate used, as well as cement and water requirements, workability, pumpability, and concrete durability.
Generally speaking, if the water-cement ratio is chosen correctly, a wide rating range can be used without a major effect on strength. When specifying void graded aggregates, certain particle sizes are omitted from the aggregate of the size continuum. Gradual separation aggregates are used to obtain uniform textures in concrete with exposed aggregate. It is essential to have strict control of mix ratios in order to avoid segregation. The quality of an aggregate is determined by its physical and chemical properties.
The physical properties include shape, size, texture, bulk density, porosity, surface area and color. The chemical properties include composition and reactivity with other materials. The quality of an aggregate also depends on its ability to resist weathering and wear. Aggregates should be free from organic matter and other impurities that can affect the strength and durability of concrete. In order to ensure good quality aggregate for construction purposes, it is important to test the material for various parameters such as particle size distribution, specific gravity, water absorption, soundness test, abrasion test and impact test.
These tests help determine the suitability of an aggregate for a particular application. Good quality aggregate is essential for producing high-quality concrete that can withstand extreme weather conditions and last for a long time. It is important to use good quality aggregate in order to ensure that the concrete will be strong and durable.