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Effects of Aggregate Properties on Concrete

By: Haseeb Jamal / On: May 02, 2017
Coarse Aggregates Properties
 
 

Effect of Size

Variation in the size of Aggregates Coarse 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.

It is an important factor and has a maximum influence on workability. Well graded aggregates result in the least amount of voids in a given volume. Less voids result in excessive past availability in a unit volume and more lubrication. Hence the mix is cohesive and avoids segregation.

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. This factor is of secondary importance. Porous aggregates require more water compared to non absorbent aggregates for achieving same degree of workability.

Effects of absorption & Surface Moisture

Affects the following concrete behaviors: Mix-design, soundness of concrete & strength/abrasion resistance.

Shape of aggregates:

Angular aggregates increases flakiness or elongation thus reduces workability. Round smooth aggregates require less water and less lubrication and greater workability in a given w/c ratio.

 

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