Abstract
The porous fly-ash ceramics with various porosity were prepared using colloidal process with molten wax. Polyethylene terephthalate powders were used combustible pore-forming agents. The total porosity of porous fly-ash increased with the polyethylene terephthalate powder content. The flexural strength of porous fly-ash drastically decreased as the total porosity increased. By the treatment of the sintered fly-ash with 3mol/dm3 NaOH solution at 383K for 15h, phillipsite, a kind of zeolite, was formed on the sintered fly-ash surface. The flexural strength of sintered fly-ash decreased to half of the original value by the zeolitization treatment.
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