In the big sized precast shapes products made from refractory castables, in many cases a fortifying heat ressiting structure is required. Problem occures at high temperature caused by different thermal expansion rates of steel and refractories, which usually leads to crack and destruction of product.

Based on thermal expansion model of steel structures, Novaref’s expert applied the special design which enable to minimize the thermal expansion differences of materials. Adopting the hexmesh reinforcement also helps to avoid cracking phenomena of big sized precast shape structures.

This new solution had been applied in manufacturing the damper for hot air duct with the dimentions up to 4500x2700x200mm and weight of 6.5mt/pcs. The product have a longer service life compared with the previous design.

san pham lon  san pham lon 2

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