The production of visual concrete, whether precast or in-situ, requires not only a high standard of quality control in manufacture, but also careful consideration to the correct specification and detailing of the material to ensure a quality finish which weathers appropriately. The exposed concrete at St John's College, Oxford (Fig. 3.16) illustrates the visual qualities of the material when designed, detailed and executed under optimum conditions.
The appearance of visual concrete is affected by four key factors:
• the composition of the concrete mix;
• any surface treatment after casting;
• the quality of workmanship.
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