Recycling municipal solid waste incineration (MSWI) fly ash as addition for clay brick

Abstract

The authors analyses the possibilities of recycling municipal solid waste incineration (MSWI) fly ash in clay brick manufacture. The paper analyses the effect of MWSI fly ash (FA) on physical-mechanical characteristics, environmental toxicity of clay bricks. The clay bricks were prepared by adding 2.5-7.5 % of FA and firing them at 1000 o C temperature. Physical and mechanical characteristics of clay brick change depending on the content of FA added: shrinkage, density and compressive strength reduce, water absorption and total porosity increase. Clay bricks containing 2.5-5 % FA do not exceed the limit values of inert substances according to the Waste Directive 2003/33/EC. According to the test results and taking into consideration clay brick physical - mechanical characteristics and environmental toxicity, the recommended content of the addition to the moulding compound is 2.5-5 % FA.