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Material quality and thicknesses, three-dimensional restraints, demoulding mechanisms, temperature effects are important considerations in designing good moulds. 2 Tolerances Precast concrete units can be manufactured to comparatively close tolerances, although it should be appreciated that, as with insitu concrete, some dimensional variations are inevitable. Manufacturing tolerances should be specified for overall dimensions, thickness, bow, twist, flatness, squareness, size and location of openings and cast-in items.

20c). 20 – Back-up materials and bond breakers in movement joints 30 (a) Minimum joint gap widths The minimum joint gap width should be derived to accommodate the construction and manufacturing tolerances, the range of movements anticipated, the required dimensions of the sealant to accommodate those movements, and the desired appearance. A minimum joint width of 12 mm between panels is a common practice. However, for structural movement joints, a joint width of 50 mm or more may be required. Joints of such width require special sealant properties to avoid slump.

Iii) Types and causes of failure of sealants The different ways in which sealants can fail as a consequence of different factors including climatic conditions, environmental factors, substrate incompatibility, abrasion and traffic loading need to be considered when selecting a sealant. Gaskets (a) General Gaskets are used to provide a barrier against wind and rain. They are required to be under compression at all times for proper functioning. (b) Materials Gaskets made of natural rubber compounds have to be protected from the weather by a synthetic rubber skin.

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Code of Practice for Precast Concrete Construction by Buildings Department, Hong Kong

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