Bar Chair AS NZS

Plastic Bar Chair. Used in the construction material.AS NZS Plastic slab-on-ground spacers are suitable for supporting both reinforcing mesh and bar in slab-on-ground applications. Slab-on-ground spacers are made to cover two heights These bar chairs are a dual-size plastic reinforcing They have a flat base to minimise penetration through the waterproof membrane The bar chairs are supplied stacked in the bag to minimise storage space According to AS3600, cover is the distance between the outside of the reinforcing steel or tendons and the nearest permanent surface of the member, excluding any surface finish. The two primary purposes of cover are durability and fire resistance. As a general rule, cover is selected from an appropriate table but there are several cases where additional cross checks are required. A secondary reason for adequate cover is to ensure that the stresses in steel and concrete can be transferred, one to another, by bond. These actions are called stress development and anchorage. The cover required for these purposes is measured not to the nearest bar, but to the bar whose stress is being developed.