- Exposed Aggregate Home
- What is Exposed Aggregate and Where is it Used?
- Advantages of Exposed Aggregate Finishes
- How to Expose the Aggregate
- Choosing the Right Decorative Aggregate
- Choosing Decorative Aggregate
- Adding the Aggregate to the Concrete
- Design Ideas for Exposed Aggregate Finishes
- Achieving Special Effects
- Exposed Aggregate Pool Decks
- Exposed Aggregate Driveways
- Combining Decorative Elements with Exposed Aggregate
- Ideas for Enhancing Exposed Aggregate Concrete
- Protecting and Maintaining Exposed Aggregate
- Exposed Aggregate Sealers
- Exposed Aggregate Maintenance
- Related Information:
- Aggregates in Ready-Mix Concrete
- Review our Comprehensive Sections on Concrete, Patios, Pool Decks and Driveways
- New Concrete Aggregate Glows in the Dark
Adding the Aggregate to the Concrete
There are three different methods for incorporating the decorative aggregate into concrete slabs for later exposure:
Seed the aggregate onto the surfaceThe most commonly used method is to seed the decorative aggregate onto the slab surface immediately after the concrete has been placed, struck off, and bull floated. This involves sprinkling the aggregate by hand or shovel uniformly onto the surface and then embedding it with a bull float or darby until it's completely covered by a thin layer of cement paste.
Mix the aggregate into the concreteYou can also have the ready-mix producer put the decorative aggregate right into the concrete mix during batching, which eliminates the step of seeding it onto the surface after concrete placement. However, depending on the cost of the aggregate you choose, this method can be more expensive than seeding because it requires using greater quantities of decorative aggregate.
Put the aggregate into a thin toppingAnother alternative is to place a thin topping course of concrete containing the decorative aggregate over a base slab of conventional concrete. The topping can range in thickness from 1 to 2 inches, depending on the aggregate size. This method generally works best when smaller decorative aggregates are specified.