| Permeable ceramic brick is one of new green environmental protection building materials,is one kind of ceramic brick with continuous space made of pore-forming technology.It has good properties of water-retention and water-permeability.And it can solve the environmental problem.It has good sound absorption and city noise reduction.Pore-forming technology has special functions in the course of permeable ceramic brick preparation.This paper makes comprehensive study on common pore-forming methods. At the same time,thinking of physical and chemical properties of pegmatite,particle accumulation method was used for preparation of permeable ceramic brick.Special mould was designed for molding methods of permeable ceramic brick.Further,the orthogonal experiment was used for permeable ceramic brick preparation process conditions:aggregate size 1.25～2mm,molding pressure 30MPa,sintering temperature 1000℃,thermal-insulating timelh.Had prepared the permeable ceramic brick on the basis of the above that studied, compression strength was 43.5MPa.permeability coefficient 2.1×10-2cm/s,the capability of holding water 0.9g/cm2,freezing and thawing the strength of circulation to losel 1.5%.Its performance was higher than that stipulated in standard JC/T945-2005"permeable brick".The specific effect of aggregate size,molding pressure,bonding agent volume on compression strength and permeability coefficient was discussed,As aggregate size decreased,molding pressure and bonding agent increased,compression strength higher and permeability coefficient lower.Then,permeability coefficient tester was designed.Permeability coefficient and pore,porosity and compression strength relational expressions of rate was set sup completely,offer the basis for design and application of permeable ceramic brick.The mechanism and influencing factors were studied,including pore spacing,porosity,water filling state.At last,sound absorption property was studied in this paper.Sound absorption coefficient of permeable ceramic brick was more than 0.285 through experiments,the absorption effect obviously,and the absorption property influencing factors were discussed.
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