Aggregate shape is classified based on the relative sharpness or roundness of the edges and corners. This classification includes categories like rounded, angular, elongated, and flaky, each with specific characteristics. Rounded aggregates, fully shaped by attrition, are typical of river or seashore gravel, while angular aggregates, such as crushed rock, have well-defined edges. Aggregates that are elongated and flaky are less desirable, as they can reduce the workability and strength of concrete.

The texture of aggregates refers to their surface characteristics, which can range from smooth to rough. The texture affects the bond between aggregate and cement. Smooth textures, resulting from weathering by water or the breakage of fine-grained rocks, may require less water for concrete mixing, whereas rough textures, like those of crushed basalt or limestone, provide better bonding with cement but may increase water demand. The surface textures in aggregates can also include glassy, granular, honeycombed, and crystalline forms.

The packing of aggregates is also influenced by their shape and texture. Aggregates that are angular and rough offer less efficient packing but potentially stronger mechanical interlock in concrete compared to rounded and smooth aggregates.

Tags
Aggregate ShapeCoarse AggregateAngular AggregatesRounded AggregatesElongated AggregatesFlaky AggregatesAggregate TextureSurface CharacteristicsConcrete WorkabilityBonding With CementPacking EfficiencySmooth TextureRough TextureMechanical Interlock

From Chapter 5:

article

Now Playing

5.10 : Shape and Texture of Coarse Aggregate

Aggregates and Water

141 Views

article

5.1 : Unsoundness of Aggregate due to Volume Change

Aggregates and Water

69 Views

article

5.2 : Deleterious Substances in Aggregate

Aggregates and Water

112 Views

article

5.3 : Sieve Analysis and Grading Curves

Aggregates and Water

180 Views

article

5.4 : Fineness Modulus

Aggregates and Water

128 Views

article

5.5 : Types of Aggregate Grading

Aggregates and Water

228 Views

article

5.6 : Maximum Size of Aggregate

Aggregates and Water

41 Views

article

5.7 : Quality of Water

Aggregates and Water

59 Views

article

5.8 : Testing Water Quality

Aggregates and Water

75 Views

article

5.9 : Aggregates Classification

Aggregates and Water

272 Views

article

5.11 : Bonding and Strength of Aggregate

Aggregates and Water

106 Views

article

5.12 : Toughness and Hardness of Aggregate

Aggregates and Water

180 Views

article

5.13 : Specific Gravity of Aggregate

Aggregates and Water

141 Views

article

5.14 : Bulk Density of Aggregate

Aggregates and Water

336 Views

article

5.15 : Porosity and Absorption of Aggregate

Aggregates and Water

198 Views

See More

JoVE Logo

Privacy

Terms of Use

Policies

Research

Education

ABOUT JoVE

Copyright © 2025 MyJoVE Corporation. All rights reserved