Influence of the Polymer Modified Mortar Coating on Gas Permeability of Steel Fiber Concrete

The gas permeability of polymer modified mortar coating add steel fiber concrete compound structure was studied by thickness-wall cylinder structure experiment. The coatings were characterized by scanning electron microscope,energy-dispersive X-ray spectroscopy.the gas permeability of steel fiber concrete is 6.85×10-15 m2. applying the coating can reach 10-17 m2. The intrinsic gas permeability of polymer modified cement based materials is 1.36×10-17 m2 using regression calculate analysis method .Coating thickness is constant, raw materials composition and structure is the fundamental factors affecting permeability.