Graphical Construction Glossary >> Concrete and Concreting. >> Concrete finish >> Seeded Finish Concrete
There are many decorative effects that depend on the whole of the concrete mass being made different in some way. The aggregates while still structural can be different colours and the cement can be different and again the whole of the mix can be stained. All this happens at the batching plant and because these changes apply to the whole of the mix then they can be quite expensive.
A cheaper way is to seed or scatter over the surface of the wet concrete (after it has been leveled and bull-floated) a layer of something different. I the photos here the mixture that has been scattered and embedded into the surface contains different fine aggregates and chips of glass. When these are randomly thrown onto the surface they are lightly rolled with something akin to a large paint roller to embed them slightly. They may also be lightly tamped and bull-floated to do the same thing.
When this has been done then the surface is sprayed with a retarder and then when the concrete has set it is water blasted to expose the aggregate in the normal way.This method allows for the use of very fine exposed aggregates or exotic materials while not compromising the structural strength of the concrete pavement.
Many types of material can be used for the scattered layer and it is not just applicable to exposed aggregate, but grinding and polishing can be done to give rich effects.
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