angular and elongated aggregate particles require more water than
smooth rounded aggregates to make the concrete workable. Angular
aggregates require more cement than smooth aggregates to
maintain the same cement to water ratio. Rough and angular aggregates
form larger voids in the concrete mixture than smooth aggregates.
More water and cement is used to fill the larger voids in rough and
angular aggregates. Rough and angular aggregates form a stronger bond
than smooth aggregates.
Aggregates should be stored to reduce segregation. Aggregates stored in
uniform thin layers segregate less than when they are stored on conical
piles. Rough and angular, and small aggregates segregate less than
smooth, and large aggregates.
Materials In Concrete.
2.Concrete Aggregates - Concrete Slump.
3.Concrete Placement - Vibration - Hydration.
4.Types of Portland Cement - Concrete Moisture & Cracking.
5.Watertight Concrete - Supplementary Cementing Materials.
6.Supplementary Cementing Materials.
7.Chemicals That Damage Concrete.
8.Concrete Aggregate Properties.
9.Angular & Smooth Aggregate Properties.
12.Air Entraining Admixtures.
13.Air Entraining Admixtures Continued.
14.Conditions Affecting Concrete Air Volume.
15.Superplasticizers & Other Admixtures.
16.Ordering & Mixing Concrete.
17.Concrete Mixing - Subgrade Preparation.
18.Subbase Preparation - Concrete Placement.
22.Hot Weather Concreting.
23.Cold Weather Concreting.
24.Concrete Slump Test.