Effects of Different Properties of Aggregates on the Properties of Concrete
Effect of Size
Variation in the size of Aggregates changes the water demand, cement content, micro-cracking (strength) in concrete. It also effects pumpability, and durability of concrete.
Effect of Grading
Grading of aggregates depends on the proportions of coarse and fine aggregate. If grading of aggregate is varied, it also changes cement paste content (cost economy), workability of the mix, density and porosity.
Effects of Surface Texture
Surface texture of aggregates itself depends on rock hardness, grain size, porosity, previous exposure and affects workability, paste demand, initial strength of concrete. Shape and surface texture affects usually the properties of freshly mixed concrete. Rough-textured and elongated particles require more cement paste to produce workable concrete mixtures, thus increasing the cost
Effects of absorption & Surface Moisture
Affects the following concrete behaviors: Mix-design, soundness of concrete & strength/abrasion resistance.