Insitu Concrete

The quality of in-situ visual concrete is heavily dependent upon the formwork as any defects will be mirrored in the concrete surface. The formwork must be strong enough to withstand, without distortion, the pressure of the fresh concrete, and the joints must be tight enough to prevent leakage, which can cause honeycombing of the surface. A wide range of timber products, metals and plastics are used as formwork, depending upon the surface finish required.

The Independent Television News building, London (Fig. 3.20), built with in-situ concrete, is characterised by its atrium, which allows daylight to diffuse down the central core past a series of stepped terraces and can-tilevered balconies in ribbed concrete. The illumination

Fig. 3.19 Reconstructed stone cladding - Experian Data Centre, Nottingham. Photograph: Courtesy of Trent Concrete Ltd
Fig. 3.18 Slate surfaced precast concrete cladding - Swansea Museum. Photograph: Courtesy of Trent Concrete Ltd
Fig. 3.20 Concrete construction - Independent Television News Headquarters, London. Architects: Foster and Partners. Photographs: Courtesy of Richard Davies

of the restrained central space is enhanced by sun and light penetration through the frosted-glass south wall. The front facade is undercut below the second floor with the exposed concrete columns creating a sense of enclosure to the main entrance.

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