Prevent Exposed Aggregate Problems

CAUSE:

Problems associated with exposed aggregate are generally caused by uncontrolled concrete setting times, which can lead to poorly exposed aggregate, insecure exposed aggregate and inconsistency of texture. 

PREVENTION:

These issues can be prevented through the use of a water-based chemical retarder such as MasterFinish® 380. Specifically developed to overcome the issues that can be associated with uncontrolled concrete setting times, MasterFinish® 380 delays the setting of the mortar paste on the surface to a controlled depth, without adversely affecting the setting of the main concrete. The chemically retarded mortar paste may be removed by washing or brushing within a 24 hour period after the set of the concrete to expose the aggregate.