By Buildings Department, Hong Kong
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Additional resources for Code of Practice for Precast Concrete Construction
With steam curing, the concrete temperature can then be raised at a maximum rate of ° ° 10 C per half hour. The concrete temperature should at no time exceed 70 C and the rate of subsequent cooling should not exceed the rate of heating. Steam curing should be under a suitable enclosure such that the live steam can be retained. Steam jets should be positioned to allow free circulation of the steam around the surfaces of the members, and to avoid discharge directly onto the concrete or the test cubes.
5 (b) Sealant application High moisture content may be detrimental to the adhesion of the sealant. Sealing should not be undertaken if there is free water present on the surface of the concrete. (c) Types of movement (i) General The magnitude of the movement, and also the mode, frequency and rate of movement affect the performance of a sealed joint. (ii) Choice of sealant There are many factors affecting the choice of sealant suitable for the different types of movement. However, as a general rule, joints which have to accommodate frequent and rapid movement need an elastic sealant, while joints in massive components, with high thermal inertia resulting in much slower movement, may be satisfactorily sealed with an elastoplastic, plastoelastic or a plastic sealant.
Particular care should be taken to determine when this is necessary. Lifting accessories may be in the form of slings/cables, hooks or shackles. The selection of such components should take into consideration the forces due to all operations involved in the handling and erection of the precast units. Headroom availability and manoeuvrability during erection may also have an impact on the type of rigging system selected. 1 for some common rigging configurations. 7 Temporary bracing and supporting structures Precast concrete elements must be adequately braced and supported during all phases of erection to ensure proper alignment and structural integrity until permanent structural connections have been completed.