Classification of Construction Aggregate Based on Texture

Anonymous July 28, 2017
Based on texture, aggregates can be classified into smooth surface texture aggregate and rough Surface Texture Aggregate.

Smooth Surface Texture Aggregate

These aggregate categories are generally hard, dense, and fine-grained aggregates that are smoothly textured. These aggregates have lesser surface area because of lesser irregularities. When these aggregates are employed, a lesser amount of cement is necessary for the lubrication purpose. 


With there is an increase in surface smoothness, the contact area also decreases. This means a highly polished particle will have less bonding area with the matrix. Due to less water requirement, these produce high compressive strength but with poor bonding and interlocking. 

Rough Textures Aggregate

Rough textured aggregates have higher strength in tension. These help in developing bond strength in tension. These will develop lower compressive strength. 

Influence of Texture of Aggregate on the Strength of the concrete

The influence of smooth and rough aggregates on the water-cement ratio, the 28th-day flexural strength, and Compressive Strength (MPa) is shown in table-1 below.

Table.1: Influence of Texture of Aggregate on Strength of Aggregate

Particle Percentage
W/C Ratio
28th Day Flexural Strength
28th Day Compressive Strength
Smooth
Rough
100
0
0.54
4.3
34.8
50
50
0.57
4.6
32.1
0
100
0.64
4.8
29.5


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