Exposed aggregate consists of a cement and sand mixture with additional aggregates for decoration. During the installation, the top layer of cement is removed to reveal the colours and textures of these aggregates. When you're laying this concrete during a driveway installation, you can embellish it in many ways to complement the kerb view. Here are several tips. Choosing the Colour of the Aggregates With exposed aggregate, you can combine different coloured pebbles, shells, and glass to create patterns in the paving.