Reinforcement Mesh
Steel reinforcing mesh is a general purpose mesh that is used universally for a wide range of applications due to it's strength and durability and is sometimes referred to as welded fabric. The steel mesh is immersed into concrete as the concrete sets and dries out it then grips the reinforcing bars tightly allowing stresses to be transmitted between the two materials, these can then take some tensile loads and reduce bending. The coefficient of thermal expansion of steel is very close to that of concrete, reducing internal stresses caused by changed in temperature. Reinforced steel mesh is used heavily in the construction industry, to strengthen concrete slabs and limit cracking.The reinforcing steel mesh is stocked in three grades A142, A193, and A252.
We supply reinforcing fabric to BS4483 nationwide.
We stock A393, A252, A142 type mesh reinforcement
'B' Mesh, 'C' Mesh, D49 and other mesh types also quickly available to order.
...and now...
A393, A252, A142 type mesh reinforcement in Merchant size (3.6m x 2.0m) sheets and also D49 wrapping fabric (2.4m x 4.8m) sheets at our Southampton Depot.
Steel meshWhere steel reinforcement of a slab is required for structural reasons, the specification will more than likely require high-tensile steel bars as well as fabric mesh, and the design should be undertaken by a qualified engineer. Steel mesh comes in a wide array profiles with varying mesh sizes and wire sizes as indicated in the table opposite. |  Table 1 - Welded Steel Fabric for Pavements |
 Typical steel fabric sheet | Typically, the mesh, also known as 'fabric', comes in sheets measuring 4800mm × 2400mm which are cut to required size on site by means of a cut-off saw or 'croppers'. Where sheets need to be overlapped, the lap should be at least 350mm and the two layers should be lashed together with tie-wire.The most commonly specified steel fabrics for paving works are A142 (6mm wires), A193 (7mm wires) and A252 (8mm wires). A142 mesh is often used in 100mm thick light-use slabs such as paths, driveways and garage bases, while A252 is normally associated with heavier-duty 150-200mm thick slabs, with A193 used in either. In light-use applications, a single layer of fabric may be used, but in heavier jobs, two layers are used "top and bottom". |
 Lapping of fabric sheets |
| There must ALWAYS be a minimum of 50mm cover over steel reinforcement, both above, below and around, as shown in the diagram opposite. The fabric is supported from beneath at regular intervals by padstones, which are often broken pressed concrete flagstones, or "chairs", purpose-made plastic or steel supports. These supports are spaced roughly every 600mm or so, sufficient to carry the fabric without allowing it to sag unacceptably. |  Cover for steel mesh |
 Steel in position for a groundbeam | As mentioned above, high-tensile steel bars are not normally used in pavement slabs unless there are extenuating circumstances, but are regularly used in ground beams and vertical structures. Bar steel is also commonly used in toed garage and house slabs or rafts where the building is to be constructed from brickwork; by keeping the slab in tension, the steel helps prevent cantilevering forces of the brickwork cracking the slab.Steel-fixing is a trade in itself and is currently beyond the remit of this web-site. |
Comments
Post a Comment