Precast concrete is used extensively in building structures, for e.g. structural frames, floors and roofs, claddings etc. Use of Precast Concrete in frames: There are two main types of precast building frame. The structural frame consists of slabs, beams and columns. Structural frames are mainly used for offices, car parks and retail developments. The cross-wall(…)
Precast Concrete
FEATURES OF PRECAST CONCRETE CONSTRUCTION
Because precast concrete can be cast at ground level in factory conditions, it has these added features: Better Finishes: Better finishes can be obtained with precast concrete because the inside surface of the mould is kept in good condition. There is no grout loss, such as that from badly fitting formwork, which results in poor(…)
TYPES OF PRECAST COMPONENTS IN A BUILDING
TYPES OF PRECAST COMPONENTS IN A BUILDING: The figure below shows the basic precast structure. The numbers of different types of components in these structures over the years have become very large. But following figure shows the major types of precast components in a building. Precast Beams: There are two main categories of beams: Internal(…)
SPECIFICATIONS AND TOLERANCES IN PRECAST CONCRETE
Specifications for Precast Concrete: Structural units of precast concrete is manufactured in the grade of concrete and to the sizes and details shown on the Drawings. Where the installation of precast concrete units in any structure is such that the faces of the units are to be left exposed either internally or externally, the exposed(…)
PRECAST CONCRETE BLOCKS
A precast concrete block is primarily used as a building material in the construction of walls. It is sometimes called a concrete masonry unit (CMU). A concrete block is one of several precast concrete products used in construction. The term precast refers to the fact that the blocks are formed and hardened before they are(…)
LIFT-SLAB CONSTRUCTION
Lift-Slab Construction is a precast method of construction of slab on the ground and then lifting it to the structure. A type of precasting used in building construction involves casting floor and roof slabs at or near ground level and lifting them to their final position, hence the name lift-slab construction. It offers many of(…)
LOADS ON PRECAST CONCRETE CLADDINGS
Like any other part of the structure, cladding is subjected to the same loads – permanent, imposed, wind, snow and ice, and accidental loads. Cladding panels behave like wall panels and are therefore subjected to the same forces, i.e. axial compression, horizontal flexure due to wind, and in-plane and out-of-plane shear. But considerations must also(…)
FIXING OF PRECAST CLADDING
Types of Fixings of Precast Cladding: Load bearing fixings are designed to transfer the weight of the cladding units together with any services or secondary fixings, such as doors or windows that may be present, to the building structure and are usually designed as pin-jointed supports. These fixings generally take the form of concrete nibs(…)