Shapes and texture

-Shape

• Rounded ( about 35% vold)

1. Less specific surface area
2. Weaker bond
3. Better workability
4. Does not give high strength concrete

• Irregular

1. High surface area
2. Good bond
3. Low workability
4. Does not give high strength concrete

Shapes and texture affect the strength and workability of concrete

• Angular ( about 40 percent vold )

1. Provide highest specific surface area
2. Provide better bonding therefore better strength of concrete
3. Lower workability

• Flat , Elongated or flaky

1. Obkectionable
2. Weaker bond
3. Lower workability
4. Does not give high strength concrete
5. % of elongated and flaky of aggregates should not more than 10-15 percent